diff --git a/SPEC.md b/SPEC.md
index 732c91a..e9f3cc7 100644
--- a/SPEC.md
+++ b/SPEC.md
@@ -307,6 +307,7 @@ Lazy vaults have their `USER_VAULTS` index populated on first access via `initia
 
 #### `create_vault_full(owner, amount, start_time, end_time) → u64`
 - Admin-only.
+- Requires `(end_time - start_time) ≤ MAX_DURATION` where `MAX_DURATION = 315,360,000` seconds (10 years). Panics otherwise.
 - Deducts `amount` from `ADMIN_BALANCE`. Panics if insufficient.
 - Writes full vault struct with `is_initialized = true`.
 - Updates `USER_VAULTS[owner]`.
@@ -315,6 +316,7 @@ Lazy vaults have their `USER_VAULTS` index populated on first access via `initia
 
 #### `create_vault_lazy(owner, amount, start_time, end_time) → u64`
 - Admin-only.
+- Requires `(end_time - start_time) ≤ MAX_DURATION` where `MAX_DURATION = 315,360,000` seconds (10 years). Panics otherwise.
 - Same as above but sets `is_initialized = false` and skips `USER_VAULTS` write.
 - Lower storage cost at creation time.
 
@@ -341,6 +343,7 @@ Lazy vaults have their `USER_VAULTS` index populated on first access via `initia
 #### `batch_create_vaults_lazy(batch_data) → Vec<u64>`
 - Admin-only.
 - Validates total batch amount against `ADMIN_BALANCE` in a single check upfront.
+- Requires each vault’s `(end_time - start_time) ≤ MAX_DURATION` where `MAX_DURATION = 315,360,000` seconds (10 years). Panics otherwise.
 - Creates all vaults lazily in a loop. Updates `VAULT_COUNT` once at the end.
 
 #### `batch_create_vaults_full(batch_data) → Vec<u64>`
diff --git a/contracts/grant_contracts/src/lib.rs b/contracts/grant_contracts/src/lib.rs
index 680e063..9c912aa 100644
--- a/contracts/grant_contracts/src/lib.rs
+++ b/contracts/grant_contracts/src/lib.rs
@@ -10,6 +10,9 @@ const END_TIME: Symbol = symbol_short!("END");
 const RECIPIENT: Symbol = symbol_short!("RECIPIENT");
 const CLAIMED: Symbol = symbol_short!("CLAIMED");
 
+// 10 years in seconds (Issue #44)
+const MAX_DURATION: u64 = 315_360_000;
+
 #[contractimpl]
 impl GrantContract {
     pub fn initialize_grant(
@@ -18,35 +21,47 @@ impl GrantContract {
         total_amount: U256,
         duration_seconds: u64,
     ) -> u64 {
+        assert!(
+            duration_seconds <= MAX_DURATION,
+            "duration exceeds MAX_DURATION"
+        );
         let start_time = env.ledger().timestamp();
         let end_time = start_time + duration_seconds;
-        
+
         env.storage().instance().set(&TOTAL_AMOUNT, &total_amount);
         env.storage().instance().set(&START_TIME, &start_time);
         env.storage().instance().set(&END_TIME, &end_time);
         env.storage().instance().set(&RECIPIENT, &recipient);
-        env.storage().instance().set(&CLAIMED, &U256::from_u32(&env, 0));
-        
+        env.storage()
+            .instance()
+            .set(&CLAIMED, &U256::from_u32(&env, 0));
         end_time
     }
-    
+
     pub fn claimable_balance(env: Env) -> U256 {
         let current_time = env.ledger().timestamp();
         let start_time = env.storage().instance().get(&START_TIME).unwrap_or(0);
         let end_time = env.storage().instance().get(&END_TIME).unwrap_or(0);
-        let total_amount = env.storage().instance().get(&TOTAL_AMOUNT).unwrap_or(U256::from_u32(&env, 0));
-        let claimed = env.storage().instance().get(&CLAIMED).unwrap_or(U256::from_u32(&env, 0));
-        
+        let total_amount = env
+            .storage()
+            .instance()
+            .get(&TOTAL_AMOUNT)
+            .unwrap_or(U256::from_u32(&env, 0));
+        let claimed = env
+            .storage()
+            .instance()
+            .get(&CLAIMED)
+            .unwrap_or(U256::from_u32(&env, 0));
         if current_time <= start_time {
             return U256::from_u32(&env, 0);
         }
-        
+
         let elapsed = if current_time >= end_time {
             end_time - start_time
         } else {
             current_time - start_time
         };
-        
+
         let total_duration = end_time - start_time;
         let vested = if total_duration > 0 {
             let elapsed_u256 = U256::from_u32(&env, elapsed as u32);
@@ -55,36 +70,47 @@ impl GrantContract {
         } else {
             U256::from_u32(&env, 0)
         };
-        
+
         if vested > claimed {
             vested.sub(&claimed)
         } else {
             U256::from_u32(&env, 0)
         }
     }
-    
+
     pub fn claim(env: Env, recipient: Address) -> U256 {
         recipient.require_auth();
-        
+
         let stored_recipient = env.storage().instance().get(&RECIPIENT).unwrap();
         assert_eq!(recipient, stored_recipient, "Unauthorized recipient");
-        
+
         let claimable = Self::claimable_balance(env.clone());
         assert!(claimable > U256::from_u32(&env, 0), "No tokens to claim");
-        
-        let claimed = env.storage().instance().get(&CLAIMED).unwrap_or(U256::from_u32(&env, 0));
+
+        let claimed = env
+            .storage()
+            .instance()
+            .get(&CLAIMED)
+            .unwrap_or(U256::from_u32(&env, 0));
         let new_claimed = claimed.add(&claimable);
         env.storage().instance().set(&CLAIMED, &new_claimed);
-        
+
         claimable
     }
-    
+
     pub fn get_grant_info(env: Env) -> (U256, u64, u64, U256) {
-        let total_amount = env.storage().instance().get(&TOTAL_AMOUNT).unwrap_or(U256::from_u32(&env, 0));
+        let total_amount = env
+            .storage()
+            .instance()
+            .get(&TOTAL_AMOUNT)
+            .unwrap_or(U256::from_u32(&env, 0));
         let start_time = env.storage().instance().get(&START_TIME).unwrap_or(0);
         let end_time = env.storage().instance().get(&END_TIME).unwrap_or(0);
-        let claimed = env.storage().instance().get(&CLAIMED).unwrap_or(U256::from_u32(&env, 0));
-        
+        let claimed = env
+            .storage()
+            .instance()
+            .get(&CLAIMED)
+            .unwrap_or(U256::from_u32(&env, 0));
         (total_amount, start_time, end_time, claimed)
     }
 }
diff --git a/contracts/grant_contracts/src/test.rs b/contracts/grant_contracts/src/test.rs
index 5e44068..148d692 100644
--- a/contracts/grant_contracts/src/test.rs
+++ b/contracts/grant_contracts/src/test.rs
@@ -1,7 +1,7 @@
 #![cfg(test)]
 
 use super::*;
-use soroban_sdk::{testutils::{Address as _, Ledger}, Address, Env, U256};
+use soroban_sdk::{testutils::Address as _, Address, Env, U256};
 
 #[test]
 fn test_basic_grant() {
@@ -15,7 +15,22 @@ fn test_basic_grant() {
     let duration = 100u64;
 
     client.initialize_grant(&recipient, &total_amount, &duration);
-    
+
     let claimable = client.claimable_balance();
     assert_eq!(claimable, U256::from_u32(&env, 0));
 }
+
+#[test]
+#[should_panic(expected = "duration exceeds MAX_DURATION")]
+fn test_initialize_rejects_duration_over_max() {
+    let env = Env::default();
+    env.mock_all_auths();
+    let contract_id = env.register(GrantContract, ());
+    let client = GrantContractClient::new(&env, &contract_id);
+
+    let recipient = Address::generate(&env);
+    let total_amount = U256::from_u32(&env, 1000);
+    let duration = super::MAX_DURATION + 1;
+
+    client.initialize_grant(&recipient, &total_amount, &duration);
+}
diff --git a/contracts/vesting_contracts/src/lib.rs b/contracts/vesting_contracts/src/lib.rs
index b7ee757..a163c9a 100644
--- a/contracts/vesting_contracts/src/lib.rs
+++ b/contracts/vesting_contracts/src/lib.rs
@@ -6,6 +6,9 @@ use soroban_sdk::{
     Vec,
 };
 
+// 10 years in seconds (Issue #44)
+pub const MAX_DURATION: u64 = 315_360_000;
+
 // DataKey for whitelisted tokens
 #[contracttype]
 pub enum WhitelistDataKey {
@@ -51,6 +54,12 @@ pub struct Vault {
     pub released_amount: i128,
     pub start_time: u64,
     pub end_time: u64,
+    pub creation_time: u64, // Timestamp of creation for clawback grace period
+    pub step_duration: u64, // Duration of each vesting step in seconds (0 = linear)
+
+    pub is_initialized: bool,  // Lazy initialization flag
+    pub is_irrevocable: bool,  // Security flag to prevent admin withdrawal
+    pub is_transferable: bool, // Can the beneficiary transfer this vault?
     pub keeper_fee: i128, // Fee paid to anyone who triggers auto_claim
         pub title: String, // Short human-readable title (max 32 chars)
     pub is_initialized: bool, // Lazy initialization flag
@@ -115,6 +124,26 @@ pub struct VestingContract;
 #[contractimpl]
 #[allow(deprecated)]
 impl VestingContract {
+    fn require_not_deprecated(env: &Env) {
+        let deprecated: bool = env
+            .storage()
+            .instance()
+            .get(&DataKey::IsDeprecated)
+            .unwrap_or(false);
+        if deprecated {
+            panic!("Contract is deprecated");
+        }
+    }
+
+    fn require_valid_duration(start_time: u64, end_time: u64) {
+        let duration = end_time
+            .checked_sub(start_time)
+            .unwrap_or_else(|| panic!("end_time must be >= start_time"));
+        if duration > MAX_DURATION {
+            panic!("duration exceeds MAX_DURATION");
+        }
+    }
+
     // Admin-only: Add token to whitelist
     pub fn add_to_whitelist(env: Env, token: Address) {
         Self::require_admin(&env);
@@ -424,6 +453,7 @@ impl VestingContract {
     ) -> u64 {
 
         Self::require_admin(&env);
+        Self::require_valid_duration(start_time, end_time);
 
         let mut vault_count: u64 = env
             .storage()
@@ -528,6 +558,7 @@ impl VestingContract {
         step_duration: u64,
     ) -> u64 {
         Self::require_admin(&env);
+        Self::require_valid_duration(start_time, end_time);
 
         let mut vault_count: u64 = env
             .storage()
@@ -673,24 +704,6 @@ impl VestingContract {
             elapsed
         };
 
-        if vault.step_duration > 0 {
-            // Periodic vesting: calculate vested = (elapsed / step_duration) * rate * step_duration
-            // Rate is total_amount / duration, so: vested = (elapsed / step_duration) * (total_amount / duration) * step_duration
-            // This simplifies to: vested = (elapsed / step_duration) * total_amount * step_duration / duration
-            let completed_steps = elapsed / vault.step_duration;
-            let rate_per_second = vault.total_amount / duration as i128;
-            let vested = completed_steps as i128 * rate_per_second * vault.step_duration as i128;
-            
-            // Ensure we don't exceed total amount
-            if vested > vault.total_amount {
-                vault.total_amount
-            } else {
-                vested
-            }
-        } else {
-            // Linear vesting
-            (vault.total_amount * elapsed as i128) / duration as i128
-        }
         (vault.total_amount * effective_elapsed as i128) / duration as i128
     }
 
@@ -1157,6 +1170,9 @@ impl VestingContract {
         let now = env.ledger().timestamp();
         for i in 0..batch_data.recipients.len() {
             let vault_id = initial_count + i as u64 + 1;
+            let start_time: u64 = batch_data.start_times.get(i).unwrap();
+            let end_time: u64 = batch_data.end_times.get(i).unwrap();
+            Self::require_valid_duration(start_time, end_time);
 
             let vault = Vault {
                 title: String::from_slice(&env, ""),
@@ -1164,12 +1180,9 @@ impl VestingContract {
                 delegate: None,
                 total_amount: batch_data.amounts.get(i).unwrap(),
                 released_amount: 0,
-                start_time: batch_data.start_times.get(i).unwrap(),
-                end_time: batch_data.end_times.get(i).unwrap(),
+                start_time,
+                end_time,
                 keeper_fee: batch_data.keeper_fees.get(i).unwrap(),
-                title: String::from_slice(&env, ""),
-                is_initialized: false, // Lazy initialization
-                is_irrevocable: false, // Default to revocable for batch operations
                 is_initialized: false,
                 is_irrevocable: false,
                 creation_time: now,
@@ -1184,7 +1197,6 @@ impl VestingContract {
                 .set(&DataKey::VaultData(vault_id), &vault);
             vault_ids.push_back(vault_id);
 
-            let start_time = batch_data.start_times.get(i).unwrap();
             let cliff_duration = start_time.saturating_sub(now);
             let vault_created = VaultCreated {
                 vault_id,
@@ -1244,6 +1256,9 @@ impl VestingContract {
         let now = env.ledger().timestamp();
         for i in 0..batch_data.recipients.len() {
             let vault_id = initial_count + i as u64 + 1;
+            let start_time: u64 = batch_data.start_times.get(i).unwrap();
+            let end_time: u64 = batch_data.end_times.get(i).unwrap();
+            Self::require_valid_duration(start_time, end_time);
 
             let vault = Vault {
                 title: String::from_slice(&env, ""),
@@ -1251,8 +1266,8 @@ impl VestingContract {
                 delegate: None,
                 total_amount: batch_data.amounts.get(i).unwrap(),
                 released_amount: 0,
-                start_time: batch_data.start_times.get(i).unwrap(),
-                end_time: batch_data.end_times.get(i).unwrap(),
+                start_time,
+                end_time,
                 keeper_fee: batch_data.keeper_fees.get(i).unwrap(),
                 title: String::from_slice(&env, ""),
                 is_initialized: true,
@@ -1280,7 +1295,6 @@ impl VestingContract {
 
             vault_ids.push_back(vault_id);
 
-            let start_time = batch_data.start_times.get(i).unwrap();
             let cliff_duration = start_time.saturating_sub(now);
             let vault_created = VaultCreated {
                 vault_id,
@@ -1434,6 +1448,12 @@ impl VestingContract {
     pub fn revoke_partial(env: Env, vault_id: u64, amount: i128) -> i128 {
         Self::require_admin(&env);
 
+        let mut vault: Vault = env
+            .storage()
+            .instance()
+            .get(&DataKey::VaultData(vault_id))
+            .unwrap_or_else(|| panic!("Vault not found"));
+
         let returned = Self::internal_revoke_partial(&env, vault_id, amount);
 
         // Single admin balance update for this call
@@ -1593,6 +1613,10 @@ impl VestingContract {
         if now > vault.creation_time + grace_period {
             panic!("Grace period expired");
         }
+        if vault.released_amount > 0 {
+            panic!("Tokens already claimed");
+        }
+
 
         if vault.released_amount > 0 {
             panic!("Tokens already claimed");
@@ -1908,7 +1932,6 @@ impl VestingContract {
 
     // Calculate currently claimable tokens based on linear vesting
     pub fn get_claimable_amount(env: Env, vault_id: u64) -> i128 {
-        let vault: Vault = env.storage().instance()
         let vault: Vault = env
             .storage()
             .instance()
@@ -1927,7 +1950,6 @@ impl VestingContract {
     // Auto-claim function that anyone can call.
     // Tokens go to beneficiary, but keeper earns a fee.
     pub fn auto_claim(env: Env, vault_id: u64, keeper: Address) {
-        let mut vault: Vault = env.storage().instance()
         if Self::is_paused(env.clone()) {
             panic!("Contract is paused - all withdrawals are disabled");
         }
@@ -2105,4 +2127,7 @@ impl VestingContract {
     }
 }
 
+// Unit tests for this contract are kept as integration tests under
+// `contracts/vesting_contracts/tests/` to avoid `no_std` test-harness friction.
+// mod test;
 // mod test; // Disabled - tests need refactoring
diff --git a/contracts/vesting_contracts/src/test.rs b/contracts/vesting_contracts/src/test.rs
index 7dfa62d..0faf08d 100644
--- a/contracts/vesting_contracts/src/test.rs
+++ b/contracts/vesting_contracts/src/test.rs
@@ -1,8 +1,6 @@
 #[cfg(test)]
 mod tests {
-        use crate::{
-        BatchCreateData, Milestone, VestingContract, VestingContractClient,
-    };
+    use crate::{BatchCreateData, Milestone, VestingContract, VestingContractClient};
     use soroban_sdk::{
         contract, contractimpl,
         testutils::{Address as _, Ledger},
@@ -13,6 +11,13 @@ mod tests {
     // Helper: spin up a fresh contract
     // -------------------------------------------------------------------------
 
+    fn setup() -> (
+        Env,
+        Address,
+        VestingContractClient<'static>,
+        Address,
+        Address,
+    ) {
     fn setup() -> (Env, Address, VestingContractClient<'static>, Address) {
         let env = Env::default();
         env.mock_all_auths();
@@ -63,6 +68,24 @@ mod tests {
         let now = env.ledger().timestamp();
 
         let id1 = client.create_vault_full(
+            &beneficiary,
+            &1_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
+        );
+        let id2 = client.create_vault_full(
+            &beneficiary,
+            &500i128,
+            &(now + 10),
+            &(now + 2_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
             &beneficiary, &1_000i128, &now, &(now + 1_000),
             &0i128, &true, &false, &0u64,
         );
@@ -81,6 +104,14 @@ mod tests {
         let now = env.ledger().timestamp();
 
         let id = client.create_vault_lazy(
+            &beneficiary,
+            &1_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
             &beneficiary, &1_000i128, &now, &(now + 1_000),
             &0i128, &true, &false, &0u64,
         );
@@ -91,6 +122,66 @@ mod tests {
     // Batch vault creation
     // -------------------------------------------------------------------------
 
+    #[test]
+    #[should_panic(expected = "duration exceeds MAX_DURATION")]
+    fn test_create_vault_full_rejects_duration_over_max() {
+        let (env, _cid, client, _admin, _token) = setup();
+        let beneficiary = Address::generate(&env);
+        let start = env.ledger().timestamp();
+        let end = start + crate::MAX_DURATION + 1;
+
+        client.create_vault_full(
+            &beneficiary,
+            &1_000i128,
+            &start,
+            &end,
+            &0i128,
+            &true,
+            &false,
+            &0u64,
+        );
+    }
+
+    #[test]
+    #[should_panic(expected = "duration exceeds MAX_DURATION")]
+    fn test_create_vault_lazy_rejects_duration_over_max() {
+        let (env, _cid, client, _admin, _token) = setup();
+        let beneficiary = Address::generate(&env);
+        let start = env.ledger().timestamp();
+        let end = start + crate::MAX_DURATION + 1;
+
+        client.create_vault_lazy(
+            &beneficiary,
+            &1_000i128,
+            &start,
+            &end,
+            &0i128,
+            &true,
+            &false,
+            &0u64,
+        );
+    }
+
+    #[test]
+    #[should_panic(expected = "duration exceeds MAX_DURATION")]
+    fn test_batch_create_vaults_rejects_duration_over_max() {
+        let (env, _cid, client, _admin, _token) = setup();
+        let r1 = Address::generate(&env);
+        let start = 100u64;
+        let end = start + crate::MAX_DURATION + 1;
+
+        let batch = BatchCreateData {
+            recipients: vec![&env, r1.clone()],
+            amounts: vec![&env, 1_000i128],
+            start_times: vec![&env, start],
+            end_times: vec![&env, end],
+            keeper_fees: vec![&env, 0i128],
+            step_durations: vec![&env, 0u64],
+        };
+
+        client.batch_create_vaults_lazy(&batch);
+    }
+
     #[test]
     fn test_batch_create_vaults_lazy() {
         let (env, _cid, client, _admin) = setup();
@@ -145,6 +236,14 @@ mod tests {
         let total = 1_009i128;
 
         let vault_id = client.create_vault_full(
+            &beneficiary,
+            &total,
+            &start,
+            &end,
+            &0i128,
+            &true,
+            &true,
+            &step,
             &beneficiary, &total, &start, &end,
             &0i128, &true, &true, &step,
         );
@@ -166,6 +265,14 @@ mod tests {
         let total    = 100_000i128;
 
         let vault_id = client.create_vault_full(
+            &beneficiary,
+            &total,
+            &now,
+            &(now + duration),
+            &0i128,
+            &true,
+            &false,
+            &duration,
             &beneficiary, &total, &now, &(now + duration),
             &0i128, &true, &false, &duration,
         );
@@ -184,6 +291,14 @@ mod tests {
         let duration = 1_000u64;
 
         let vault_id = client.create_vault_full(
+            &beneficiary,
+            &100_000i128,
+            &now,
+            &(now + duration),
+            &0i128,
+            &true,
+            &false,
+            &duration,
             &beneficiary, &100_000i128, &now, &(now + duration),
             &0i128, &true, &false, &duration,
         );
@@ -191,403 +306,455 @@ mod tests {
         env.ledger().with_mut(|l| l.timestamp = now + duration - 1);
         client.claim_tokens(&vault_id, &1i128);
     }
-    
+
     #[test]
     fn test_admin_access_control() {
         let (env, contract_id, client, admin) = setup();
         let new_admin = Address::generate(&env);
-    
+
         // Test: Admin can propose new admin
         client.propose_new_admin(&new_admin);
         assert_eq!(client.get_proposed_admin(), Some(new_admin.clone()));
-    
+
         // Test: Proposed admin can accept ownership
         new_admin.require_auth();
         client.accept_ownership();
-    
+
         // Verify admin transfer completed
         assert_eq!(client.get_admin(), new_admin);
         assert_eq!(client.get_proposed_admin(), None);
     }
 
-#[test]
-fn test_periodic_vesting_monthly_steps() {
-    let env = Env::default();
-    let contract_id = env.register(VestingContract, ());
-    let client = VestingContractClient::new(&env, &contract_id);
-    
-    // Create addresses for testing
-    let admin = Address::generate(&env);
-    let beneficiary = Address::generate(&env);
-    
-    // Initialize contract
-    let initial_supply = 1000000i128;
-    env.mock_all_auths();
-    env.mock_all_auths();
-    client.initialize(&admin, &initial_supply);
-    
-    // Create vault with monthly vesting (30 days = 2,592,000 seconds)
-    let amount = 1200000i128; // 1,200,000 tokens over 12 months = 100,000 per month
-    let start_time = 1000000u64;
-    let end_time = start_time + (365 * 24 * 60 * 60); // 1 year
-    let step_duration = 30 * 24 * 60 * 60; // 30 days in seconds
-    let keeper_fee = 1000i128;
-    
-    let vault_id = client.create_vault_full(
-        &beneficiary,
-        &amount,
-        &start_time,
-        &end_time,
-        &keeper_fee,
-        &false, // revocable
-        &true,  // transferable
-        &step_duration,
-    );
-    
-    // Test 1: Before start time - no vesting
-    env.ledger().set_timestamp(start_time - 1000);
-    let claimable = client.get_claimable_amount(&vault_id);
-    assert_eq!(claimable, 0, "Should have no claimable tokens before start time");
-    
-    // Test 2: After 15 days (less than one step) - still no vesting (rounds down)
-    env.ledger().set_timestamp(start_time + (15 * 24 * 60 * 60));
-    let claimable = client.get_claimable_amount(&vault_id);
-    assert_eq!(claimable, 0, "Should have no claimable tokens before first step completes");
-    
-    // Test 3: After exactly 30 days - one step completed
-    env.ledger().set_timestamp(start_time + step_duration);
-    let claimable = client.get_claimable_amount(&vault_id);
-    let expected_monthly = amount / 12; // 100,000 tokens per month
-    assert_eq!(claimable, expected_monthly, "Should have exactly one month of tokens after 30 days");
-    
-    // Test 4: After 45 days - still only one step (rounds down)
-    env.ledger().set_timestamp(start_time + (45 * 24 * 60 * 60));
-    let claimable = client.get_claimable_amount(&vault_id);
-    assert_eq!(claimable, expected_monthly, "Should still have only one month of tokens after 45 days");
-    
-    // Test 5: After 60 days - two steps completed
-    env.ledger().set_timestamp(start_time + (2 * step_duration));
-    let claimable = client.get_claimable_amount(&vault_id);
-    assert_eq!(claimable, 2 * expected_monthly, "Should have two months of tokens after 60 days");
-    
-    // Test 6: After 6 months - 6 steps completed
-    env.ledger().set_timestamp(start_time + (6 * step_duration));
-    let claimable = client.get_claimable_amount(&vault_id);
-    assert_eq!(claimable, 6 * expected_monthly, "Should have six months of tokens after 6 months");
-    
-    // Test 7: After end time - all tokens vested
-    env.ledger().set_timestamp(end_time + 1000);
-    let claimable = client.get_claimable_amount(&vault_id);
-    assert_eq!(claimable, amount, "Should have all tokens vested after end time");
-}
+    #[test]
+    fn test_periodic_vesting_monthly_steps() {
+        let env = Env::default();
+        let contract_id = env.register(VestingContract, ());
+        let client = VestingContractClient::new(&env, &contract_id);
 
-#[test]
-fn test_periodic_vesting_weekly_steps() {
-    let env = Env::default();
-    let contract_id = env.register(VestingContract, ());
-    let client = VestingContractClient::new(&env, &contract_id);
-    
-    // Create addresses for testing
-    let admin = Address::generate(&env);
-    let beneficiary = Address::generate(&env);
-    
-    // Initialize contract
-    let initial_supply = 1000000i128;
-    env.mock_all_auths();
-    client.initialize(&admin, &initial_supply);
-    
-    // Set admin as caller
-    
-    // Create vault with weekly vesting (7 days = 604,800 seconds)
-    let amount = 520000i128; // 520,000 tokens over 52 weeks = 10,000 per week
-    let start_time = 1000000u64;
-    let end_time = start_time + (365 * 24 * 60 * 60); // 1 year
-    let step_duration = 7 * 24 * 60 * 60; // 7 days in seconds
-    let keeper_fee = 100i128;
-    
-    let vault_id = client.create_vault_full(
-        &beneficiary,
-        &amount,
-        &start_time,
-        &end_time,
-        &keeper_fee,
-        &false, // revocable
-        &true,  // transferable
-        &step_duration,
-    );
-    
-    // Test: After 3 weeks - 3 steps completed
-    env.ledger().set_timestamp(start_time + (3 * step_duration));
-    let claimable = client.get_claimable_amount(&vault_id);
-    let expected_weekly = 10000i128; // 10,000 tokens per week
-    assert_eq!(claimable, 3 * expected_weekly, "Should have three weeks of tokens after 3 weeks");
-    
-    // Test: After 10 weeks - 10 steps completed
-    env.ledger().set_timestamp(start_time + (10 * step_duration));
-    let claimable = client.get_claimable_amount(&vault_id);
-    assert_eq!(claimable, 10 * expected_weekly, "Should have ten weeks of tokens after 10 weeks");
-}
+        // Create addresses for testing
+        let admin = Address::generate(&env);
+        let beneficiary = Address::generate(&env);
 
-#[test]
-fn test_linear_vesting_step_duration_zero() {
-    let env = Env::default();
-    let contract_id = env.register(VestingContract, ());
-    let client = VestingContractClient::new(&env, &contract_id);
-    
-    // Create addresses for testing
-    let admin = Address::generate(&env);
-    let beneficiary = Address::generate(&env);
-    
-    // Initialize contract
-    let initial_supply = 1000000i128;
-    env.mock_all_auths();
-    client.initialize(&admin, &initial_supply);
-    
-    // Set admin as caller
-    
-    // Create vault with linear vesting (step_duration = 0)
-    let amount = 1200000i128;
-    let start_time = 1000000u64;
-    let end_time = start_time + (365 * 24 * 60 * 60); // 1 year
-    let step_duration = 0u64; // Linear vesting
-    let keeper_fee = 1000i128;
-    
-    let vault_id = client.create_vault_full(
-        &beneficiary,
-        &amount,
-        &start_time,
-        &end_time,
-        &keeper_fee,
-        &false, // revocable
-        &true,  // transferable
-        &step_duration,
-    );
-    
-    // Test: After 6 months (half the duration) - should have 50% vested
-    env.ledger().set_timestamp(start_time + (182 * 24 * 60 * 60)); // ~6 months
-    let claimable = client.get_claimable_amount(&vault_id);
-    let expected_half = amount / 2; // 50% of tokens
-    assert_eq!(claimable, expected_half, "Should have 50% of tokens after half the time for linear vesting");
-    
-    // Test: After 3 months (quarter of the duration) - should have 25% vested
-    env.ledger().set_timestamp(start_time + (91 * 24 * 60 * 60)); // ~3 months
-    let claimable = client.get_claimable_amount(&vault_id);
-    let expected_quarter = amount / 4; // 25% of tokens
-    assert_eq!(claimable, expected_quarter, "Should have 25% of tokens after quarter of the time for linear vesting");
-}
+        // Initialize contract
+        let initial_supply = 1000000i128;
+        env.mock_all_auths();
+        env.mock_all_auths();
+        client.initialize(&admin, &initial_supply);
 
-#[test]
-fn test_periodic_vesting_claim_partial() {
-    let env = Env::default();
-    let contract_id = env.register(VestingContract, ());
-    let client = VestingContractClient::new(&env, &contract_id);
-    
-    // Create addresses for testing
-    let admin = Address::generate(&env);
-    let beneficiary = Address::generate(&env);
-    
-    // Initialize contract
-    let initial_supply = 1000000i128;
-    env.mock_all_auths();
-    client.initialize(&admin, &initial_supply);
-    
-    // Set beneficiary as caller for claiming
-    
-    // Create vault with monthly vesting
-    let amount = 120000i128; // 120,000 tokens over 12 months = 10,000 per month
-    let start_time = 1000000u64;
-    let end_time = start_time + (365 * 24 * 60 * 60); // 1 year
-    let step_duration = 30 * 24 * 60 * 60; // 30 days
-    let keeper_fee = 100i128;
-    
-    let vault_id = client.create_vault_full(
-        &beneficiary,
-        &amount,
-        &start_time,
-        &end_time,
-        &keeper_fee,
-        &false, // revocable
-        &true,  // transferable
-        &step_duration,
-    );
-    
-    // Move time to 3 months
-    env.ledger().set_timestamp(start_time + (3 * step_duration));
-    
-    // Claim partial amount
-    let claim_amount = 15000i128; // Less than the 30,000 available
-    let claimed = client.claim_tokens(&vault_id, &claim_amount);
-    assert_eq!(claimed, claim_amount, "Should claim the requested amount");
-    
-    // Check remaining claimable
-    let remaining_claimable = client.get_claimable_amount(&vault_id);
-    assert_eq!(remaining_claimable, 15000i128, "Should have 15,000 tokens remaining claimable");
-    
-    // Claim the rest
-    let final_claim = client.claim_tokens(&vault_id, &remaining_claimable);
-    assert_eq!(final_claim, remaining_claimable, "Should claim remaining tokens");
-    
-    // Check no more tokens available
-    let no_more_claimable = client.get_claimable_amount(&vault_id);
-    assert_eq!(no_more_claimable, 0, "Should have no more claimable tokens");
-}
+        // Create vault with monthly vesting (30 days = 2,592,000 seconds)
+        let amount = 1200000i128; // 1,200,000 tokens over 12 months = 100,000 per month
+        let start_time = 1000000u64;
+        let end_time = start_time + (365 * 24 * 60 * 60); // 1 year
+        let step_duration = 30 * 24 * 60 * 60; // 30 days in seconds
+        let keeper_fee = 1000i128;
 
-#[test]
-fn test_vault_creation_access_control() {
-    let env = Env::default();
-    let contract_id = env.register(VestingContract, ());
-    let client = VestingContractClient::new(&env, &contract_id);
-    
-    // Create addresses for testing
-    let admin = Address::generate(&env);
-    let vault_owner = Address::generate(&env);
-    
-    // Initialize contract with admin
-    let initial_supply = 1000000i128;
-    env.mock_all_auths();
-    client.initialize(&admin, &initial_supply);
-    
-    // Test: Admin can create vaults
-    let vault_id = client.create_vault_full(
-        &vault_owner,
-        &1000i128,
-        &100u64,
-        &200u64,
-        &0i128,
-        &false,
-        &true,
-        &0u64,
-    );
-    assert_eq!(vault_id, 1);
-}
+        let vault_id = client.create_vault_full(
+            &beneficiary,
+            &amount,
+            &start_time,
+            &end_time,
+            &keeper_fee,
+            &false, // revocable
+            &true,  // transferable
+            &step_duration,
+        );
 
-#[test]
-fn test_batch_operations_admin_control() {
-    let env = Env::default();
-    let contract_id = env.register(VestingContract, ());
-    let client = VestingContractClient::new(&env, &contract_id);
-    
-    // Create addresses for testing
-    let admin = Address::generate(&env);
-    let unauthorized_user = Address::generate(&env);
-    let recipient1 = Address::generate(&env);
-    let recipient2 = Address::generate(&env);
-    
-    // Initialize contract with admin
-    let initial_supply = 1000000i128;
-    env.mock_all_auths();
-    client.initialize(&admin, &initial_supply);
-    
-    // Create batch data
-    let batch_data = BatchCreateData {
-        recipients: vec![&env, recipient1.clone(), recipient2.clone()],
-        amounts: vec![&env, 1000i128, 2000i128],
-        start_times: vec![&env, 100u64, 150u64],
-        end_times: vec![&env, 200u64, 250u64],
-        keeper_fees: vec![&env, 0i128, 0i128],
-        step_durations: vec![&env, 0u64, 0u64],
-    };
-    
-#[test]
-fn test_batch_vault_creation() {
-    let env = Env::default();
-    let contract_id = env.register(VestingContract, ());
-    let client = VestingContractClient::new(&env, &contract_id);
-    
-    let admin = Address::generate(&env);
-    let initial_supply = 1000000i128;
-    env.mock_all_auths();
-    client.initialize(&admin, &initial_supply);
-    
-    let recipient1 = Address::generate(&env);
-    let recipient2 = Address::generate(&env);
-    
-    let batch_data = BatchCreateData {
-        recipients: vec![&env, recipient1, recipient2],
-        amounts: vec![&env, 1000i128, 2000i128],
-        start_times: vec![&env, 100u64, 100u64],
-        end_times: vec![&env, 200u64, 200u64],
-        keeper_fees: vec![&env, 10i128, 20i128],
-        step_durations: vec![&env, 0u64, 0u64],
-    };
-    
-    // Test: Admin can create batch vaults
-    let vault_ids = client.batch_create_vaults_lazy(&batch_data);
-    assert_eq!(vault_ids.len(), 2);
-    assert_eq!(vault_ids.get(0), Some(1));
-    assert_eq!(vault_ids.get(1), Some(2));
-}
+        // Test 1: Before start time - no vesting
+        env.ledger().set_timestamp(start_time - 1000);
+        let claimable = client.get_claimable_amount(&vault_id);
+        assert_eq!(
+            claimable, 0,
+            "Should have no claimable tokens before start time"
+        );
 
-#[test]
-fn test_milestone_unlocking_and_claim_limits() {
-    let env = Env::default();
-    let contract_id = env.register(VestingContract, ());
-    let client = VestingContractClient::new(&env, &contract_id);
+        // Test 2: After 15 days (less than one step) - still no vesting (rounds down)
+        env.ledger().set_timestamp(start_time + (15 * 24 * 60 * 60));
+        let claimable = client.get_claimable_amount(&vault_id);
+        assert_eq!(
+            claimable, 0,
+            "Should have no claimable tokens before first step completes"
+        );
 
-    let admin = Address::generate(&env);
-    let initial_supply = 1000000i128;
-    env.mock_all_auths();
-    client.initialize(&admin, &initial_supply);
-}
+        // Test 3: After exactly 30 days - one step completed
+        env.ledger().set_timestamp(start_time + step_duration);
+        let claimable = client.get_claimable_amount(&vault_id);
+        let expected_monthly = amount / 12; // 100,000 tokens per month
+        assert_eq!(
+            claimable, expected_monthly,
+            "Should have exactly one month of tokens after 30 days"
+        );
 
-#[test]
-fn test_step_vesting_fuzz() {
-    let env = Env::default();
-    let contract_id = env.register(VestingContract, ());
-    let client = VestingContractClient::new(&env, &contract_id);
-    
-    let admin = Address::generate(&env);
-    let beneficiary = Address::generate(&env);
-    
-    let initial_supply = 1_000_000_000_000i128;
-    env.mock_all_auths();
-    client.initialize(&admin, &initial_supply);
-
-    // Fuzz testing with prime numbers to check for truncation errors
-    // Primes: 1009 (amount), 17 (step), 101 (duration)
-    let total_amount = 1009i128;
-    let start_time = 1000u64;
-    let duration = 101u64; // Prime duration
-    let end_time = start_time + duration;
-    let step_duration = 17u64; // Prime step
-    
-    let vault_id = client.create_vault_full(
-        &beneficiary,
-        &total_amount,
-        &start_time,
-        &end_time,
-        &0i128,
-        &true,
-        &true,
-        &step_duration,
-    );
-
-    // Advance time to end
-    env.ledger().with_mut(|li| {
-        li.timestamp = end_time + 1;
-    });
-
-    // Claim all
-    let claimed = client.claim_tokens(&vault_id, &total_amount);
-    
-    // Assert full amount is claimed
-    assert_eq!(claimed, total_amount);
-    
-    // Verify vault state
-    let vault = client.get_vault(&vault_id);
-    assert_eq!(vault.released_amount, total_amount);
-}
+        // Test 4: After 45 days - still only one step (rounds down)
+        env.ledger().set_timestamp(start_time + (45 * 24 * 60 * 60));
+        let claimable = client.get_claimable_amount(&vault_id);
+        assert_eq!(
+            claimable, expected_monthly,
+            "Should still have only one month of tokens after 45 days"
+        );
 
-// Mock Staking Contract for testing cross-contract calls
-#[contract]
-pub struct MockStakingContract;
+        // Test 5: After 60 days - two steps completed
+        env.ledger().set_timestamp(start_time + (2 * step_duration));
+        let claimable = client.get_claimable_amount(&vault_id);
+        assert_eq!(
+            claimable,
+            2 * expected_monthly,
+            "Should have two months of tokens after 60 days"
+        );
+
+        // Test 6: After 6 months - 6 steps completed
+        env.ledger().set_timestamp(start_time + (6 * step_duration));
+        let claimable = client.get_claimable_amount(&vault_id);
+        assert_eq!(
+            claimable,
+            6 * expected_monthly,
+            "Should have six months of tokens after 6 months"
+        );
 
-#[contractimpl]
-impl MockStakingContract {
-    pub fn stake(env: Env, vault_id: u64, amount: i128, _validator: Address) {
-        env.events().publish((Symbol::new(&env, "stake"), vault_id), amount);
+        // Test 7: After end time - all tokens vested
+        env.ledger().set_timestamp(end_time + 1000);
+        let claimable = client.get_claimable_amount(&vault_id);
+        assert_eq!(
+            claimable, amount,
+            "Should have all tokens vested after end time"
+        );
+    }
+
+    #[test]
+    fn test_periodic_vesting_weekly_steps() {
+        let env = Env::default();
+        let contract_id = env.register(VestingContract, ());
+        let client = VestingContractClient::new(&env, &contract_id);
+
+        // Create addresses for testing
+        let admin = Address::generate(&env);
+        let beneficiary = Address::generate(&env);
+
+        // Initialize contract
+        let initial_supply = 1000000i128;
+        env.mock_all_auths();
+        client.initialize(&admin, &initial_supply);
+
+        // Set admin as caller
+
+        // Create vault with weekly vesting (7 days = 604,800 seconds)
+        let amount = 520000i128; // 520,000 tokens over 52 weeks = 10,000 per week
+        let start_time = 1000000u64;
+        let end_time = start_time + (365 * 24 * 60 * 60); // 1 year
+        let step_duration = 7 * 24 * 60 * 60; // 7 days in seconds
+        let keeper_fee = 100i128;
+
+        let vault_id = client.create_vault_full(
+            &beneficiary,
+            &amount,
+            &start_time,
+            &end_time,
+            &keeper_fee,
+            &false, // revocable
+            &true,  // transferable
+            &step_duration,
+        );
+
+        // Test: After 3 weeks - 3 steps completed
+        env.ledger().set_timestamp(start_time + (3 * step_duration));
+        let claimable = client.get_claimable_amount(&vault_id);
+        let expected_weekly = 10000i128; // 10,000 tokens per week
+        assert_eq!(
+            claimable,
+            3 * expected_weekly,
+            "Should have three weeks of tokens after 3 weeks"
+        );
+
+        // Test: After 10 weeks - 10 steps completed
+        env.ledger()
+            .set_timestamp(start_time + (10 * step_duration));
+        let claimable = client.get_claimable_amount(&vault_id);
+        assert_eq!(
+            claimable,
+            10 * expected_weekly,
+            "Should have ten weeks of tokens after 10 weeks"
+        );
+    }
+
+    #[test]
+    fn test_linear_vesting_step_duration_zero() {
+        let env = Env::default();
+        let contract_id = env.register(VestingContract, ());
+        let client = VestingContractClient::new(&env, &contract_id);
+
+        // Create addresses for testing
+        let admin = Address::generate(&env);
+        let beneficiary = Address::generate(&env);
+
+        // Initialize contract
+        let initial_supply = 1000000i128;
+        env.mock_all_auths();
+        client.initialize(&admin, &initial_supply);
+
+        // Set admin as caller
+
+        // Create vault with linear vesting (step_duration = 0)
+        let amount = 1200000i128;
+        let start_time = 1000000u64;
+        let end_time = start_time + (365 * 24 * 60 * 60); // 1 year
+        let step_duration = 0u64; // Linear vesting
+        let keeper_fee = 1000i128;
+
+        let vault_id = client.create_vault_full(
+            &beneficiary,
+            &amount,
+            &start_time,
+            &end_time,
+            &keeper_fee,
+            &false, // revocable
+            &true,  // transferable
+            &step_duration,
+        );
+
+        // Test: After 6 months (half the duration) - should have 50% vested
+        env.ledger()
+            .set_timestamp(start_time + (182 * 24 * 60 * 60)); // ~6 months
+        let claimable = client.get_claimable_amount(&vault_id);
+        let expected_half = amount / 2; // 50% of tokens
+        assert_eq!(
+            claimable, expected_half,
+            "Should have 50% of tokens after half the time for linear vesting"
+        );
+
+        // Test: After 3 months (quarter of the duration) - should have 25% vested
+        env.ledger().set_timestamp(start_time + (91 * 24 * 60 * 60)); // ~3 months
+        let claimable = client.get_claimable_amount(&vault_id);
+        let expected_quarter = amount / 4; // 25% of tokens
+        assert_eq!(
+            claimable, expected_quarter,
+            "Should have 25% of tokens after quarter of the time for linear vesting"
+        );
+    }
+
+    #[test]
+    fn test_periodic_vesting_claim_partial() {
+        let env = Env::default();
+        let contract_id = env.register(VestingContract, ());
+        let client = VestingContractClient::new(&env, &contract_id);
+
+        // Create addresses for testing
+        let admin = Address::generate(&env);
+        let beneficiary = Address::generate(&env);
+
+        // Initialize contract
+        let initial_supply = 1000000i128;
+        env.mock_all_auths();
+        client.initialize(&admin, &initial_supply);
+
+        // Set beneficiary as caller for claiming
+
+        // Create vault with monthly vesting
+        let amount = 120000i128; // 120,000 tokens over 12 months = 10,000 per month
+        let start_time = 1000000u64;
+        let end_time = start_time + (365 * 24 * 60 * 60); // 1 year
+        let step_duration = 30 * 24 * 60 * 60; // 30 days
+        let keeper_fee = 100i128;
+
+        let vault_id = client.create_vault_full(
+            &beneficiary,
+            &amount,
+            &start_time,
+            &end_time,
+            &keeper_fee,
+            &false, // revocable
+            &true,  // transferable
+            &step_duration,
+        );
+
+        // Move time to 3 months
+        env.ledger().set_timestamp(start_time + (3 * step_duration));
+
+        // Claim partial amount
+        let claim_amount = 15000i128; // Less than the 30,000 available
+        let claimed = client.claim_tokens(&vault_id, &claim_amount);
+        assert_eq!(claimed, claim_amount, "Should claim the requested amount");
+
+        // Check remaining claimable
+        let remaining_claimable = client.get_claimable_amount(&vault_id);
+        assert_eq!(
+            remaining_claimable, 15000i128,
+            "Should have 15,000 tokens remaining claimable"
+        );
+
+        // Claim the rest
+        let final_claim = client.claim_tokens(&vault_id, &remaining_claimable);
+        assert_eq!(
+            final_claim, remaining_claimable,
+            "Should claim remaining tokens"
+        );
+
+        // Check no more tokens available
+        let no_more_claimable = client.get_claimable_amount(&vault_id);
+        assert_eq!(no_more_claimable, 0, "Should have no more claimable tokens");
+    }
+
+    #[test]
+    fn test_vault_creation_access_control() {
+        let env = Env::default();
+        let contract_id = env.register(VestingContract, ());
+        let client = VestingContractClient::new(&env, &contract_id);
+
+        // Create addresses for testing
+        let admin = Address::generate(&env);
+        let vault_owner = Address::generate(&env);
+
+        // Initialize contract with admin
+        let initial_supply = 1000000i128;
+        env.mock_all_auths();
+        client.initialize(&admin, &initial_supply);
+
+        // Test: Admin can create vaults
+        let vault_id = client.create_vault_full(
+            &vault_owner,
+            &1000i128,
+            &100u64,
+            &200u64,
+            &0i128,
+            &false,
+            &true,
+            &0u64,
+        );
+        assert_eq!(vault_id, 1);
+    }
+
+    #[test]
+    fn test_batch_operations_admin_control() {
+        let env = Env::default();
+        let contract_id = env.register(VestingContract, ());
+        let client = VestingContractClient::new(&env, &contract_id);
+
+        // Create addresses for testing
+        let admin = Address::generate(&env);
+        let unauthorized_user = Address::generate(&env);
+        let recipient1 = Address::generate(&env);
+        let recipient2 = Address::generate(&env);
+
+        // Initialize contract with admin
+        let initial_supply = 1000000i128;
+        env.mock_all_auths();
+        client.initialize(&admin, &initial_supply);
+
+        // Create batch data
+        let batch_data = BatchCreateData {
+            recipients: vec![&env, recipient1.clone(), recipient2.clone()],
+            amounts: vec![&env, 1000i128, 2000i128],
+            start_times: vec![&env, 100u64, 150u64],
+            end_times: vec![&env, 200u64, 250u64],
+            keeper_fees: vec![&env, 0i128, 0i128],
+            step_durations: vec![&env, 0u64, 0u64],
+        };
+
+        #[test]
+        fn test_batch_vault_creation() {
+            let env = Env::default();
+            let contract_id = env.register(VestingContract, ());
+            let client = VestingContractClient::new(&env, &contract_id);
+
+            let admin = Address::generate(&env);
+            let initial_supply = 1000000i128;
+            env.mock_all_auths();
+            client.initialize(&admin, &initial_supply);
+
+            let recipient1 = Address::generate(&env);
+            let recipient2 = Address::generate(&env);
+
+            let batch_data = BatchCreateData {
+                recipients: vec![&env, recipient1, recipient2],
+                amounts: vec![&env, 1000i128, 2000i128],
+                start_times: vec![&env, 100u64, 100u64],
+                end_times: vec![&env, 200u64, 200u64],
+                keeper_fees: vec![&env, 10i128, 20i128],
+                step_durations: vec![&env, 0u64, 0u64],
+            };
+
+            // Test: Admin can create batch vaults
+            let vault_ids = client.batch_create_vaults_lazy(&batch_data);
+            assert_eq!(vault_ids.len(), 2);
+            assert_eq!(vault_ids.get(0), Some(1));
+            assert_eq!(vault_ids.get(1), Some(2));
+        }
+
+        #[test]
+        fn test_milestone_unlocking_and_claim_limits() {
+            let env = Env::default();
+            let contract_id = env.register(VestingContract, ());
+            let client = VestingContractClient::new(&env, &contract_id);
+
+            let admin = Address::generate(&env);
+            let initial_supply = 1000000i128;
+            env.mock_all_auths();
+            client.initialize(&admin, &initial_supply);
+        }
+
+        #[test]
+        fn test_step_vesting_fuzz() {
+            let env = Env::default();
+            let contract_id = env.register(VestingContract, ());
+            let client = VestingContractClient::new(&env, &contract_id);
+
+            let admin = Address::generate(&env);
+            let beneficiary = Address::generate(&env);
+
+            let initial_supply = 1_000_000_000_000i128;
+            env.mock_all_auths();
+            client.initialize(&admin, &initial_supply);
+
+            // Fuzz testing with prime numbers to check for truncation errors
+            // Primes: 1009 (amount), 17 (step), 101 (duration)
+            let total_amount = 1009i128;
+            let start_time = 1000u64;
+            let duration = 101u64; // Prime duration
+            let end_time = start_time + duration;
+            let step_duration = 17u64; // Prime step
+
+            let vault_id = client.create_vault_full(
+                &beneficiary,
+                &total_amount,
+                &start_time,
+                &end_time,
+                &0i128,
+                &true,
+                &true,
+                &step_duration,
+            );
+
+            // Advance time to end
+            env.ledger().with_mut(|li| {
+                li.timestamp = end_time + 1;
+            });
+
+            // Claim all
+            let claimed = client.claim_tokens(&vault_id, &total_amount);
+
+            // Assert full amount is claimed
+            assert_eq!(claimed, total_amount);
+
+            // Verify vault state
+            let vault = client.get_vault(&vault_id);
+            assert_eq!(vault.released_amount, total_amount);
+        }
+
+        // Mock Staking Contract for testing cross-contract calls
+        #[contract]
+        pub struct MockStakingContract;
+
+        #[contractimpl]
+        impl MockStakingContract {
+            pub fn stake(env: Env, vault_id: u64, amount: i128, _validator: Address) {
+                env.events()
+                    .publish((Symbol::new(&env, "stake"), vault_id), amount);
+            }
+        }
+
+        pub fn unstake(env: Env, vault_id: u64, amount: i128) {
+            env.events()
+                .publish((Symbol::new(&env, "unstake"), vault_id), amount);
+        }
     }
-}
 
     // -------------------------------------------------------------------------
     // Irrevocable vault
@@ -600,6 +767,14 @@ impl MockStakingContract {
         let now = env.ledger().timestamp();
 
         let vault_id = client.create_vault_full(
+            &beneficiary,
+            &1_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
             &beneficiary, &1_000i128, &now, &(now + 1_000),
             &0i128, &true, &false, &0u64,
         );
@@ -617,6 +792,14 @@ impl MockStakingContract {
         let now = env.ledger().timestamp();
 
         let vault_id = client.create_vault_full(
+            &beneficiary,
+            &1_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
             &beneficiary, &1_000i128, &now, &(now + 1_000),
             &0i128, &true, &false, &0u64,
         );
@@ -636,6 +819,14 @@ impl MockStakingContract {
         let now = env.ledger().timestamp();
 
         let vault_id = client.create_vault_full(
+            &beneficiary,
+            &5_000i128,
+            &(now + 100),
+            &(now + 10_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
             &beneficiary, &5_000i128, &(now + 100), &(now + 10_000),
             &0i128, &true, &false, &0u64,
         );
@@ -653,6 +844,14 @@ impl MockStakingContract {
         let now = env.ledger().timestamp();
 
         let vault_id = client.create_vault_full(
+            &beneficiary,
+            &5_000i128,
+            &(now + 100),
+            &(now + 10_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
             &beneficiary, &5_000i128, &(now + 100), &(now + 10_000),
             &0i128, &true, &false, &0u64,
         );
@@ -672,12 +871,30 @@ impl MockStakingContract {
         let now = env.ledger().timestamp();
 
         let vault_id = client.create_vault_full(
+            &beneficiary,
+            &1_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
             &beneficiary, &1_000i128, &now, &(now + 1_000),
             &0i128, &true, &false, &0u64,
         );
 
         let milestones = vec![
             &env,
+            Milestone {
+                id: 1,
+                percentage: 50,
+                is_unlocked: false,
+            },
+            Milestone {
+                id: 2,
+                percentage: 50,
+                is_unlocked: false,
+            },
             Milestone { id: 1, percentage: 50, is_unlocked: false },
             Milestone { id: 2, percentage: 50, is_unlocked: false },
         ];
@@ -700,12 +917,25 @@ impl MockStakingContract {
         let now = env.ledger().timestamp();
 
         let vault_id = client.create_vault_full(
+            &beneficiary,
+            &1_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
             &beneficiary, &1_000i128, &now, &(now + 1_000),
             &0i128, &true, &false, &0u64,
         );
 
         let milestones = vec![
             &env,
+            Milestone {
+                id: 1,
+                percentage: 100,
+                is_unlocked: false,
+            },
             Milestone { id: 1, percentage: 100, is_unlocked: false },
         ];
         client.set_milestones(&vault_id, &milestones);
@@ -724,6 +954,14 @@ impl MockStakingContract {
         let now = env.ledger().timestamp();
 
         let vault_id = client.create_vault_full(
+            &beneficiary,
+            &1_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
             &beneficiary, &1_000i128, &now, &(now + 1_000),
             &0i128, &true, &false, &0u64,
         );
@@ -747,6 +985,17 @@ impl MockStakingContract {
         let initial_supply = 1_000_000i128;
         let vault_amount = 10_000i128;
 
+        let vault_id = client.create_vault_full(
+            &beneficiary,
+            &10_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
+        );
+        assert!(client.check_invariant());
         // After vault creation: admin_balance = 990_000, vault locked = 10_000
         let vault_id = client.create_vault_full(
             &beneficiary, &vault_amount, &now, &(now + 1_000),
@@ -804,6 +1053,14 @@ impl MockStakingContract {
         let now = env.ledger().timestamp();
 
         client.create_vault_full(
+            &beneficiary,
+            &3_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
             &beneficiary, &3_000i128, &now, &(now + 1_000),
             &0i128, &true, &false, &0u64,
         );
@@ -829,6 +1086,14 @@ impl MockStakingContract {
         let now = env.ledger().timestamp();
 
         let vault_id = client.create_vault_full(
+            &beneficiary,
+            &4_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
             &beneficiary, &4_000i128, &now, &(now + 1_000),
             &0i128, &true, &false, &0u64,
         );
@@ -859,6 +1124,14 @@ impl MockStakingContract {
         for _ in 0..3 {
             let b = Address::generate(&env);
             client.create_vault_full(
+                &b,
+                &2_000i128,
+                &now,
+                &(now + 1_000),
+                &0i128,
+                &true,
+                &false,
+                &0u64,
                 &b, &2_000i128, &now, &(now + 1_000),
                 &0i128, &true, &false, &0u64,
             );
@@ -885,6 +1158,14 @@ impl MockStakingContract {
         let now = env.ledger().timestamp();
 
         let vault_id = client.create_vault_full(
+            &beneficiary,
+            &2_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
             &beneficiary, &2_000i128, &now, &(now + 1_000),
             &0i128, &true, &false, &0u64,
         );
@@ -914,6 +1195,14 @@ impl MockStakingContract {
         let now = env.ledger().timestamp();
 
         let vault_id = client.create_vault_full(
+            &beneficiary,
+            &3_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
             &beneficiary, &3_000i128, &now, &(now + 1_000),
             &0i128, &true, &false, &0u64,
         );
@@ -960,6 +1249,14 @@ impl MockStakingContract {
         let now = env.ledger().timestamp();
 
         client.create_vault_full(
+            &beneficiary,
+            &3_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
             &beneficiary, &3_000i128, &now, &(now + 1_000),
             &0i128, &true, &false, &0u64,
         );
@@ -990,6 +1287,401 @@ impl MockStakingContract {
 
         client.rescue_unallocated_tokens(&token_addr); // must panic
     }
+
+    // =========================================================================
+    // Yield demonstration tests
+    // =========================================================================
+
+    #[test]
+    fn test_yield_is_distributed_on_claim() {
+        let (env, contract_id, client, _admin, token) = setup();
+        let beneficiary = Address::generate(&env);
+        let now = env.ledger().timestamp();
+
+        let vault_id = client.create_vault_full(
+            &beneficiary,
+            &10_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
+        );
+
+        // Simulate yield
+        let stellar = token::StellarAssetClient::new(&env, &token);
+        stellar.mint(&contract_id, &2_000i128);
+
+        env.ledger().with_mut(|l| l.timestamp = now + 1_001);
+        let claimed = client.claim_tokens(&vault_id, &10_000i128);
+
+        assert_eq!(claimed, 12_000i128); // principal + all yield
+    }
+
+    #[test]
+    fn test_yield_on_partial_claim() {
+        let (env, contract_id, client, _admin, token) = setup();
+        let beneficiary = Address::generate(&env);
+        let now = env.ledger().timestamp();
+
+        let vault_id = client.create_vault_full(
+            &beneficiary,
+            &10_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
+        );
+
+        let stellar = token::StellarAssetClient::new(&env, &token);
+        stellar.mint(&contract_id, &2_000i128);
+
+        env.ledger().with_mut(|l| l.timestamp = now + 500);
+        let claimed = client.claim_tokens(&vault_id, &5_000i128);
+
+        assert_eq!(claimed, 6_000i128); // 5k principal + 1k yield
+    }
+
+    #[test]
+    fn test_yield_proportional_with_multiple_vaults() {
+        let (env, contract_id, client, _admin, token) = setup();
+        let now = env.ledger().timestamp();
+
+        let v1 = client.create_vault_full(
+            &Address::generate(&env),
+            &10_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
+        );
+        let v2 = client.create_vault_full(
+            &Address::generate(&env),
+            &20_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
+        );
+
+        let stellar = token::StellarAssetClient::new(&env, &token);
+        stellar.mint(&contract_id, &6_000i128);
+
+        env.ledger().with_mut(|l| l.timestamp = now + 1_001);
+
+        let claimed1 = client.claim_tokens(&v1, &10_000i128);
+        let claimed2 = client.claim_tokens(&v2, &20_000i128);
+
+        assert_eq!(claimed1, 12_000i128);
+        assert_eq!(claimed2, 24_000i128);
+    }
+
+    #[test]
+    #[should_panic(expected = "Cannot rescue yield-bearing token")]
+    fn test_rescue_yield_token_panics() {
+        let (env, _cid, client, _admin, token) = setup();
+        client.rescue_unallocated_tokens(&token);
+    }
+
+    // -------------------------------------------------------------------------
+    // Zero-duration vault fuzz tests (Issue #41)
+    // -------------------------------------------------------------------------
+
+    #[test]
+    fn test_zero_duration_vault_immediate_unlock() {
+        let (env, _cid, client, _admin) = setup();
+        let beneficiary = Address::generate(&env);
+        let now = env.ledger().timestamp();
+
+        let vault_id = client.create_vault_full(
+            &beneficiary,
+            &5_000i128,
+            &now,
+            &now,
+            &0i128,
+            &true,
+            &false,
+            &0u64,
+        );
+
+        let claimable = client.get_claimable_amount(&vault_id);
+        assert_eq!(
+            claimable, 5_000i128,
+            "zero-duration vault should unlock 100% immediately"
+        );
+    }
+
+    #[test]
+    fn test_zero_duration_vault_claim_full() {
+        let (env, _cid, client, _admin) = setup();
+        let beneficiary = Address::generate(&env);
+        let now = env.ledger().timestamp();
+
+        let vault_id = client.create_vault_full(
+            &beneficiary,
+            &10_000i128,
+            &now,
+            &now,
+            &0i128,
+            &true,
+            &false,
+            &0u64,
+        );
+
+        let claimed = client.claim_tokens(&vault_id, &10_000i128);
+        assert_eq!(
+            claimed, 10_000i128,
+            "should claim full amount from zero-duration vault"
+        );
+
+        let vault = client.get_vault(&vault_id);
+        assert_eq!(vault.released_amount, 10_000i128);
+    }
+
+    #[test]
+    fn test_zero_duration_vault_before_start() {
+        let (env, _cid, client, _admin) = setup();
+        let beneficiary = Address::generate(&env);
+        let future = env.ledger().timestamp() + 1_000;
+
+        let vault_id = client.create_vault_full(
+            &beneficiary,
+            &5_000i128,
+            &future,
+            &future,
+            &0i128,
+            &true,
+            &false,
+            &0u64,
+        );
+
+        let claimable = client.get_claimable_amount(&vault_id);
+        assert_eq!(
+            claimable, 0,
+            "zero-duration vault should not unlock before start_time"
+        );
+    }
+
+    #[test]
+    fn test_zero_cliff_vault_vests_immediately() {
+        let (env, _cid, client, _admin) = setup();
+        let beneficiary = Address::generate(&env);
+        let now = env.ledger().timestamp();
+
+        let vault_id = client.create_vault_full(
+            &beneficiary,
+            &10_000i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
+        );
+
+        env.ledger().with_mut(|l| l.timestamp = now + 500);
+        let claimable = client.get_claimable_amount(&vault_id);
+        assert!(
+            claimable > 0,
+            "zero-cliff vault should vest from start_time"
+        );
+    }
+
+    #[test]
+    fn test_zero_amount_vault_no_claimable() {
+        let (env, _cid, client, _admin) = setup();
+        let beneficiary = Address::generate(&env);
+        let now = env.ledger().timestamp();
+
+        let vault_id = client.create_vault_full(
+            &beneficiary,
+            &0i128,
+            &now,
+            &(now + 1_000),
+            &0i128,
+            &true,
+            &false,
+            &0u64,
+        );
+
+        env.ledger().with_mut(|l| l.timestamp = now + 1_001);
+        let claimable = client.get_claimable_amount(&vault_id);
+        assert_eq!(
+            claimable, 0,
+            "zero-amount vault should have nothing claimable"
+        );
+    }
+
+    #[test]
+    fn test_zero_duration_zero_amount_vault() {
+        let (env, _cid, client, _admin) = setup();
+        let beneficiary = Address::generate(&env);
+        let now = env.ledger().timestamp();
+
+        let vault_id = client.create_vault_full(
+            &beneficiary,
+            &0i128,
+            &now,
+            &now,
+            &0i128,
+            &true,
+            &false,
+            &0u64,
+        );
+
+        let claimable = client.get_claimable_amount(&vault_id);
+        assert_eq!(
+            claimable, 0,
+            "zero-duration + zero-amount vault should have nothing claimable"
+        );
+    }
+
+    #[test]
+    fn test_vault_start_time_immutable() {
+        let env = Env::default();
+        let contract_id = env.register(VestingContract, ());
+        let client = VestingContractClient::new(&env, &contract_id);
+
+        let admin = Address::generate(&env);
+        let initial_supply = 1000000i128;
+        client.initialize(&admin, &initial_supply);
+
+        // Create a vault
+        let owner = Address::generate(&env);
+        let amount = 1000i128;
+        let start_time = 123456789u64;
+        let end_time = start_time + 10000;
+        let keeper_fee = 10i128;
+        let is_revocable = false;
+        let is_transferable = false;
+        let step_duration = 0u64;
+        let vault_id = client.create_vault(
+            &owner,
+            &amount,
+            &start_time,
+            &end_time,
+            &keeper_fee,
+            &is_revocable,
+            &is_transferable,
+            &step_duration,
+        );
+
+        // Try to change start_time or cliff_duration (should not be possible)
+        let vault = client.get_vault(&vault_id);
+        let original_start_time = vault.start_time;
+        let original_cliff_duration = vault.cliff_duration;
+
+        // Attempt to update vault via admin functions (should not affect start_time/cliff_duration)
+        client.mark_irrevocable(&vault_id);
+        client.transfer_beneficiary(&vault_id, &Address::generate(&env));
+        client.set_delegate(&vault_id, &Some(Address::generate(&env)));
+
+        let updated_vault = client.get_vault(&vault_id);
+        assert_eq!(updated_vault.start_time, original_start_time);
+        assert_eq!(updated_vault.cliff_duration, original_cliff_duration);
+    }
+
+    #[test]
+    fn test_global_pause_functionality() {
+        let env = Env::default();
+        let contract_id = env.register(VestingContract, ());
+        let client = VestingContractClient::new(&env, &contract_id);
+
+        // Create addresses for testing
+        let admin = Address::generate(&env);
+        let beneficiary = Address::generate(&env);
+        let unauthorized_user = Address::generate(&env);
+
+        // Initialize contract with admin
+        let initial_supply = 1000000i128;
+        client.initialize(&admin, &initial_supply);
+
+        // Verify initial state is unpaused
+        assert_eq!(client.is_paused(), false);
+
+        // Test: Unauthorized user cannot toggle pause
+        env.as_contract(&contract_id, || {
+            env.current_contract_address().set(&unauthorized_user);
+        });
+
+        let result = std::panic::catch_unwind(|| {
+            client.toggle_pause();
+        });
+        assert!(result.is_err());
+        assert_eq!(client.is_paused(), false); // Should still be unpaused
+
+        // Test: Admin can pause the contract
+        env.as_contract(&contract_id, || {
+            env.current_contract_address().set(&admin);
+        });
+
+        client.toggle_pause();
+        assert_eq!(client.is_paused(), true); // Should now be paused
+
+        // Create a vault for testing claims
+        let now = env.ledger().timestamp();
+        let vault_id = client.create_vault_full(
+            &beneficiary,
+            &1000i128,
+            &now,
+            &(now + 1000),
+            &0i128,
+            &false,
+            &true,
+            &0u64,
+        );
+
+        // Move time to make tokens claimable
+        env.ledger().set_timestamp(now + 1001);
+
+        // Set beneficiary as caller
+        env.as_contract(&contract_id, || {
+            env.current_contract_address().set(&beneficiary);
+        });
+
+        // Test: Claims should fail when paused
+        let result = std::panic::catch_unwind(|| {
+            client.claim_tokens(&vault_id, &100i128);
+        });
+        assert!(result.is_err());
+
+        // Test: Delegate claims should also fail when paused
+        let delegate = Address::generate(&env);
+        client.set_delegate(&vault_id, &Some(delegate.clone()));
+
+        env.as_contract(&contract_id, || {
+            env.current_contract_address().set(&delegate);
+        });
+
+        let result = std::panic::catch_unwind(|| {
+            client.claim_as_delegate(&vault_id, &100i128);
+        });
+        assert!(result.is_err());
+
+        // Test: Admin can unpause the contract
+        env.as_contract(&contract_id, || {
+            env.current_contract_address().set(&admin);
+        });
+
+        client.toggle_pause();
+        assert_eq!(client.is_paused(), false); // Should be unpaused
+
+        // Test: Claims should work after unpausing
+        env.as_contract(&contract_id, || {
+            env.current_contract_address().set(&beneficiary);
+        });
+
+        let claimed = client.claim_tokens(&vault_id, &100i128);
+        assert_eq!(claimed, 100i128); // Should succeed
+    }
+}
 }
 }
 
diff --git a/contracts/vesting_contracts/tests/max_duration.rs b/contracts/vesting_contracts/tests/max_duration.rs
new file mode 100644
index 0000000..0a45e6e
--- /dev/null
+++ b/contracts/vesting_contracts/tests/max_duration.rs
@@ -0,0 +1,102 @@
+use soroban_sdk::{testutils::Address as _, vec, Address, Env};
+
+use vesting_contracts::{BatchCreateData, VestingContract, VestingContractClient, MAX_DURATION};
+
+fn setup(env: &Env) -> (VestingContractClient<'static>, Address) {
+    env.mock_all_auths();
+
+    let contract_id = env.register(VestingContract, ());
+    let client = VestingContractClient::new(env, &contract_id);
+
+    let admin = Address::generate(env);
+    client.initialize(&admin, &1_000_000i128);
+
+    (client, admin)
+}
+
+#[test]
+fn create_vault_full_allows_max_duration() {
+    let env = Env::default();
+    let (client, _admin) = setup(&env);
+
+    let beneficiary = Address::generate(&env);
+    let start = env.ledger().timestamp();
+    let end = start + MAX_DURATION;
+
+    client.create_vault_full(
+        &beneficiary,
+        &1_000i128,
+        &start,
+        &end,
+        &0i128,
+        &true,
+        &false,
+        &0u64,
+    );
+}
+
+#[test]
+#[should_panic(expected = "duration exceeds MAX_DURATION")]
+fn create_vault_full_rejects_over_max_duration() {
+    let env = Env::default();
+    let (client, _admin) = setup(&env);
+
+    let beneficiary = Address::generate(&env);
+    let start = env.ledger().timestamp();
+    let end = start + MAX_DURATION + 1;
+
+    client.create_vault_full(
+        &beneficiary,
+        &1_000i128,
+        &start,
+        &end,
+        &0i128,
+        &true,
+        &false,
+        &0u64,
+    );
+}
+
+#[test]
+#[should_panic(expected = "duration exceeds MAX_DURATION")]
+fn create_vault_lazy_rejects_over_max_duration() {
+    let env = Env::default();
+    let (client, _admin) = setup(&env);
+
+    let beneficiary = Address::generate(&env);
+    let start = env.ledger().timestamp();
+    let end = start + MAX_DURATION + 1;
+
+    client.create_vault_lazy(
+        &beneficiary,
+        &1_000i128,
+        &start,
+        &end,
+        &0i128,
+        &true,
+        &false,
+        &0u64,
+    );
+}
+
+#[test]
+#[should_panic(expected = "duration exceeds MAX_DURATION")]
+fn batch_create_vaults_rejects_over_max_duration() {
+    let env = Env::default();
+    let (client, _admin) = setup(&env);
+
+    let recipient = Address::generate(&env);
+    let start = 100u64;
+    let end = start + MAX_DURATION + 1;
+
+    let batch = BatchCreateData {
+        recipients: vec![&env, recipient],
+        amounts: vec![&env, 1_000i128],
+        start_times: vec![&env, start],
+        end_times: vec![&env, end],
+        keeper_fees: vec![&env, 0i128],
+        step_durations: vec![&env, 0u64],
+    };
+
+    client.batch_create_vaults_lazy(&batch);
+}
diff --git a/contracts/vesting_curves/Cargo.lock b/contracts/vesting_curves/Cargo.lock
new file mode 100644
index 0000000..c832c29
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diff --git a/contracts/vesting_curves/Cargo.toml b/contracts/vesting_curves/Cargo.toml
index c11052a..a6cdf46 100644
--- a/contracts/vesting_curves/Cargo.toml
+++ b/contracts/vesting_curves/Cargo.toml
@@ -5,6 +5,9 @@ members = ["contracts/vesting-vault"]
 [workspace.dependencies]
 soroban-sdk = "22.0.0"
 
+[patch.crates-io]
+keccak = { path = "vendor/keccak-0.1.5" }
+
 [profile.release]
 opt-level = "z"
 overflow-checks = true
@@ -17,4 +20,4 @@ lto = true
 
 [profile.release-with-logs]
 inherits = "release"
-debug-assertions = true
\ No newline at end of file
+debug-assertions = true
diff --git a/contracts/vesting_curves/contracts/vesting-vault/Cargo.toml b/contracts/vesting_curves/contracts/vesting-vault/Cargo.toml
new file mode 100644
index 0000000..f94be8b
--- /dev/null
+++ b/contracts/vesting_curves/contracts/vesting-vault/Cargo.toml
@@ -0,0 +1,15 @@
+[package]
+name = "vesting-vault"
+version = "0.0.0"
+edition = "2021"
+publish = false
+
+[lib]
+crate-type = ["lib", "cdylib"]
+doctest = false
+
+[dependencies]
+soroban-sdk = { workspace = true }
+
+[dev-dependencies]
+soroban-sdk = { workspace = true, features = ["testutils"] }
diff --git a/contracts/vesting_curves/contracts/vesting-vault/Makefile b/contracts/vesting_curves/contracts/vesting-vault/Makefile
new file mode 100644
index 0000000..b971934
--- /dev/null
+++ b/contracts/vesting_curves/contracts/vesting-vault/Makefile
@@ -0,0 +1,16 @@
+default: build
+
+all: test
+
+test: build
+	cargo test
+
+build:
+	stellar contract build
+	@ls -l target/wasm32v1-none/release/*.wasm
+
+fmt:
+	cargo fmt --all
+
+clean:
+	cargo clean
diff --git a/contracts/vesting_curves/src/lib.rs b/contracts/vesting_curves/contracts/vesting-vault/src/lib.rs
similarity index 96%
rename from contracts/vesting_curves/src/lib.rs
rename to contracts/vesting_curves/contracts/vesting-vault/src/lib.rs
index 6d6ae65..08350a2 100644
--- a/contracts/vesting_curves/src/lib.rs
+++ b/contracts/vesting_curves/contracts/vesting-vault/src/lib.rs
@@ -1,4 +1,3 @@
-
 #![no_std]
 
 use soroban_sdk::{
@@ -17,6 +16,9 @@ const START: Symbol        = symbol_short!("START");
 const DURATION: Symbol     = symbol_short!("DURATION");
 const CURVE: Symbol        = symbol_short!("CURVE");
 
+// 10 years in seconds (Issue #44)
+const MAX_DURATION: u64 = 315_360_000;
+
 #[contracttype]
 #[derive(Clone, Debug, PartialEq)]
 pub enum VestingCurve {
@@ -54,6 +56,7 @@ impl VestingVault {
 
         assert!(total_amount > 0, "total_amount must be positive");
         assert!(duration > 0, "duration must be positive");
+        assert!(duration <= MAX_DURATION, "duration exceeds MAX_DURATION");
 
         admin.require_auth();
 
@@ -98,12 +101,7 @@ impl VestingVault {
         }
 
         match curve {
-
-            VestingCurve::Linear => {
-
-                (total * elapsed as i128) / duration as i128
-            }
-
+            VestingCurve::Linear => (total * elapsed as i128) / duration as i128,
             VestingCurve::Exponential => {
                 let elapsed_u128  = elapsed as u128;
                 let duration_u128 = duration as u128;
@@ -181,4 +179,4 @@ impl VestingVault {
 // ---------------------------------------------------------------------------
 
 #[cfg(test)]
-mod test;
\ No newline at end of file
+mod test;
diff --git a/contracts/vesting_curves/src/test.rs b/contracts/vesting_curves/contracts/vesting-vault/src/test.rs
similarity index 84%
rename from contracts/vesting_curves/src/test.rs
rename to contracts/vesting_curves/contracts/vesting-vault/src/test.rs
index 3daf30f..e3d7809 100644
--- a/contracts/vesting_curves/src/test.rs
+++ b/contracts/vesting_curves/contracts/vesting-vault/src/test.rs
@@ -1,4 +1,3 @@
-
 #![cfg(test)]
 
 extern crate std;
@@ -23,7 +22,6 @@ struct Setup {
     env: Env,
     vault: VestingVaultClient<'static>,
     token: Address,
-    admin: Address,
     beneficiary: Address,
 }
 
@@ -61,7 +59,7 @@ fn create_setup(curve: VestingCurve) -> Setup {
         &curve,
     );
 
-    Setup { env, vault, token, admin, beneficiary }
+    Setup { env, vault, token, beneficiary }
 }
 
 // ---------------------------------------------------------------------------
@@ -276,7 +274,6 @@ fn z1_zero_duration_panics() {
     let vault_id = env.register(crate::VestingVault, ());
     let vault    = VestingVaultClient::new(&env, &vault_id);
     TokenClient::new(&env, &token).transfer(&admin, &vault_id, &TOTAL);
-
     env.ledger().with_mut(|l| l.timestamp = START);
 
     vault.initialize(
@@ -338,7 +335,6 @@ fn z3_zero_duration_exponential_panics() {
     TokenClient::new(&env, &token).transfer(&admin, &vault_id, &TOTAL);
 
     env.ledger().with_mut(|l| l.timestamp = START);
-
     vault.initialize(
         &admin,
         &beneficiary,
@@ -348,4 +344,71 @@ fn z3_zero_duration_exponential_panics() {
         &0u64,
         &VestingCurve::Exponential,
     );
-}
\ No newline at end of file
+}
+
+// ── Duration cap (Issue #44) ────────────────────────────────────────────────
+
+#[test]
+fn i7_initialize_allows_max_duration() {
+    let env = Env::default();
+    env.mock_all_auths();
+
+    let admin = Address::generate(&env);
+    let beneficiary = Address::generate(&env);
+    let token_admin = Address::generate(&env);
+
+    let token_id = env.register_stellar_asset_contract_v2(token_admin.clone());
+    let token = token_id.address();
+    StellarAssetClient::new(&env, &token).mint(&admin, &TOTAL);
+
+    let vault_id = env.register(crate::VestingVault, ());
+    let vault = VestingVaultClient::new(&env, &vault_id);
+
+    TokenClient::new(&env, &token).transfer(&admin, &vault_id, &TOTAL);
+
+    env.ledger().with_mut(|l| l.timestamp = START);
+
+    vault.initialize(
+        &admin,
+        &beneficiary,
+        &token,
+        &TOTAL,
+        &START,
+        &crate::MAX_DURATION,
+        &VestingCurve::Linear,
+    );
+    assert_eq!(vault.get_curve(), VestingCurve::Linear);
+}
+
+#[test]
+#[should_panic(expected = "duration exceeds MAX_DURATION")]
+fn i8_initialize_rejects_duration_over_max() {
+    let env = Env::default();
+    env.mock_all_auths();
+
+    let admin = Address::generate(&env);
+    let beneficiary = Address::generate(&env);
+    let token_admin = Address::generate(&env);
+
+    let token_id = env.register_stellar_asset_contract_v2(token_admin.clone());
+    let token = token_id.address();
+    StellarAssetClient::new(&env, &token).mint(&admin, &TOTAL);
+
+    let vault_id = env.register(crate::VestingVault, ());
+    let vault = VestingVaultClient::new(&env, &vault_id);
+
+    TokenClient::new(&env, &token).transfer(&admin, &vault_id, &TOTAL);
+    env.ledger().with_mut(|l| l.timestamp = START);
+
+    let too_long = crate::MAX_DURATION + 1;
+
+    vault.initialize(
+        &admin,
+        &beneficiary,
+        &token,
+        &TOTAL,
+        &START,
+        &too_long,
+        &VestingCurve::Linear,
+    );
+}
diff --git a/contracts/vesting_curves/vendor/keccak-0.1.5/.cargo-ok b/contracts/vesting_curves/vendor/keccak-0.1.5/.cargo-ok
new file mode 100644
index 0000000..5f8b795
--- /dev/null
+++ b/contracts/vesting_curves/vendor/keccak-0.1.5/.cargo-ok
@@ -0,0 +1 @@
+{"v":1}
\ No newline at end of file
diff --git a/contracts/vesting_curves/vendor/keccak-0.1.5/.cargo_vcs_info.json b/contracts/vesting_curves/vendor/keccak-0.1.5/.cargo_vcs_info.json
new file mode 100644
index 0000000..4a71c96
--- /dev/null
+++ b/contracts/vesting_curves/vendor/keccak-0.1.5/.cargo_vcs_info.json
@@ -0,0 +1,6 @@
+{
+  "git": {
+    "sha1": "64a5bebb67c943933157e77a6cc62eac36b87d12"
+  },
+  "path_in_vcs": "keccak"
+}
\ No newline at end of file
diff --git a/contracts/vesting_curves/vendor/keccak-0.1.5/CHANGELOG.md b/contracts/vesting_curves/vendor/keccak-0.1.5/CHANGELOG.md
new file mode 100644
index 0000000..01a8a68
--- /dev/null
+++ b/contracts/vesting_curves/vendor/keccak-0.1.5/CHANGELOG.md
@@ -0,0 +1,45 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
+and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## 0.1.5 (2024-01-12)
+### Changed
+- Enable ARMv8 ASM backend for `p1600` ([#68])
+
+[#68]: https://github.com/RustCrypto/sponges/pull/68
+
+## 0.1.4 (2023-05-04)
+### Added
+- `keccak_p` fns for `[200, 400, 800, 1600]` ([#55])
+
+### Changed
+- 2018 edition upgrade ([#32])
+
+[#32]: https://github.com/RustCrypto/sponges/pull/32
+[#55]: https://github.com/RustCrypto/sponges/pull/55
+
+## 0.1.3 (2022-11-14)
+### Added
+- ARMv8 SHA3 ASM intrinsics implementation for `keccak_f1600` ([#23])
+
+[#23]: https://github.com/RustCrypto/sponges/pull/23
+
+## 0.1.2 (2022-05-24)
+### Changed
+- Implement `simd` feature with  `portable_simd` instead of deprecated `packed_simd` ([#16])
+
+[#16]: https://github.com/RustCrypto/sponges/pull/16
+
+## 0.1.1 (2022-05-24)
+### Added
+- Generic keccak-p and keccak-f {200, 400, 800} ([#7])
+- f1600x{2, 4, 8} ([#8])
+
+[#7]: https://github.com/RustCrypto/sponges/pull/7
+[#8]: https://github.com/RustCrypto/sponges/pull/8
+
+## 0.1.0 (2018-03-27)
+- Initial release
diff --git a/contracts/vesting_curves/vendor/keccak-0.1.5/Cargo.toml b/contracts/vesting_curves/vendor/keccak-0.1.5/Cargo.toml
new file mode 100644
index 0000000..6d7ae31
--- /dev/null
+++ b/contracts/vesting_curves/vendor/keccak-0.1.5/Cargo.toml
@@ -0,0 +1,43 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+name = "keccak"
+version = "0.1.5"
+authors = ["RustCrypto Developers"]
+description = """
+Pure Rust implementation of the Keccak sponge function including the keccak-f
+and keccak-p variants
+"""
+documentation = "https://docs.rs/keccak"
+readme = "README.md"
+keywords = [
+    "crypto",
+    "sponge",
+    "keccak",
+    "keccak-f",
+    "keccak-p",
+]
+categories = [
+    "cryptography",
+    "no-std",
+]
+license = "Apache-2.0 OR MIT"
+repository = "https://github.com/RustCrypto/sponges/tree/master/keccak"
+
+[features]
+asm = []
+no_unroll = []
+simd = []
+
+[target."cfg(target_arch = \"aarch64\")".dependencies.cpufeatures]
+version = "0.2"
diff --git a/contracts/vesting_curves/vendor/keccak-0.1.5/Cargo.toml.orig b/contracts/vesting_curves/vendor/keccak-0.1.5/Cargo.toml.orig
new file mode 100644
index 0000000..8a87110
--- /dev/null
+++ b/contracts/vesting_curves/vendor/keccak-0.1.5/Cargo.toml.orig
@@ -0,0 +1,23 @@
+[package]
+name = "keccak"
+version = "0.1.5"
+description = """
+Pure Rust implementation of the Keccak sponge function including the keccak-f
+and keccak-p variants
+"""
+authors = ["RustCrypto Developers"]
+license = "Apache-2.0 OR MIT"
+documentation = "https://docs.rs/keccak"
+repository = "https://github.com/RustCrypto/sponges/tree/master/keccak"
+keywords = ["crypto", "sponge", "keccak", "keccak-f", "keccak-p"]
+categories = ["cryptography", "no-std"]
+readme = "README.md"
+edition = "2018"
+
+[features]
+asm = []       # Use optimized assembly when available (currently only ARMv8)
+no_unroll = [] # Do no unroll loops for binary size reduction
+simd = []      # Use core::simd (nightly-only)
+
+[target.'cfg(target_arch = "aarch64")'.dependencies]
+cpufeatures = "0.2"
diff --git a/contracts/vesting_curves/vendor/keccak-0.1.5/LICENSE-APACHE b/contracts/vesting_curves/vendor/keccak-0.1.5/LICENSE-APACHE
new file mode 100644
index 0000000..78173fa
--- /dev/null
+++ b/contracts/vesting_curves/vendor/keccak-0.1.5/LICENSE-APACHE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
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+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
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diff --git a/contracts/vesting_curves/vendor/keccak-0.1.5/LICENSE-MIT b/contracts/vesting_curves/vendor/keccak-0.1.5/LICENSE-MIT
new file mode 100644
index 0000000..81a3d57
--- /dev/null
+++ b/contracts/vesting_curves/vendor/keccak-0.1.5/LICENSE-MIT
@@ -0,0 +1,25 @@
+Copyright (c) 2018-2022 RustCrypto Developers
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
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+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/contracts/vesting_curves/vendor/keccak-0.1.5/README.md b/contracts/vesting_curves/vendor/keccak-0.1.5/README.md
new file mode 100644
index 0000000..989c311
--- /dev/null
+++ b/contracts/vesting_curves/vendor/keccak-0.1.5/README.md
@@ -0,0 +1,66 @@
+# RustCrypto: Keccak Sponge Function
+
+[![crate][crate-image]][crate-link]
+[![Docs][docs-image]][docs-link]
+[![Build Status][build-image]][build-link]
+![Apache2/MIT licensed][license-image]
+![Rust Version][rustc-image]
+[![Project Chat][chat-image]][chat-link]
+
+Pure Rust implementation of the [Keccak Sponge Function][1] including the keccak-f
+and keccak-p variants.
+
+[Documentation][docs-link]
+
+## About
+
+This crate implements the core Keccak sponge function, upon which many other
+cryptographic functions are built.
+
+For the SHA-3 family including the SHAKE XOFs, see the [`sha3`] crate, which
+is built on this crate.
+
+## Minimum Supported Rust Version
+
+Rust **1.41** or higher by default, or **1.59** with the `asm` feature enabled.
+
+Minimum supported Rust version can be changed in the future, but it will be
+done with a minor version bump.
+
+## SemVer Policy
+
+- All on-by-default features of this library are covered by SemVer
+- MSRV is considered exempt from SemVer as noted above
+
+## License
+
+Licensed under either of:
+
+ * [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
+ * [MIT license](http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.
+
+[//]: # (badges)
+
+[crate-image]: https://img.shields.io/crates/v/keccak.svg
+[crate-link]: https://crates.io/crates/keccak
+[docs-image]: https://docs.rs/keccak/badge.svg
+[docs-link]: https://docs.rs/keccak/
+[build-image]: https://github.com/RustCrypto/sponges/actions/workflows/keccak.yml/badge.svg
+[build-link]: https://github.com/RustCrypto/sponges/actions/workflows/keccak.yml
+[license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
+[rustc-image]: https://img.shields.io/badge/rustc-1.41+-blue.svg
+[chat-image]: https://img.shields.io/badge/zulip-join_chat-blue.svg
+[chat-link]: https://rustcrypto.zulipchat.com/#narrow/stream/369879-sponges
+
+[//]: # (general links)
+
+[1]: https://keccak.team/keccak.html
+[`sha3`]: https://github.com/RustCrypto/hashes/tree/master/sha3
diff --git a/contracts/vesting_curves/vendor/keccak-0.1.5/benches/mod.rs b/contracts/vesting_curves/vendor/keccak-0.1.5/benches/mod.rs
new file mode 100644
index 0000000..960c40a
--- /dev/null
+++ b/contracts/vesting_curves/vendor/keccak-0.1.5/benches/mod.rs
@@ -0,0 +1,43 @@
+#![feature(test)]
+#![cfg_attr(feature = "simd", feature(portable_simd))]
+
+extern crate keccak;
+extern crate test;
+
+use keccak::{f1600, f200, f400, f800, p1600};
+
+macro_rules! impl_bench {
+    ($name:ident, $fn:ident, $type:expr) => {
+        #[bench]
+        fn $name(b: &mut test::Bencher) {
+            let mut data = [$type; 25];
+            b.iter(|| $fn(&mut data));
+        }
+    };
+}
+
+impl_bench!(b_f200, f200, 0u8);
+impl_bench!(b_f400, f400, 0u16);
+impl_bench!(b_f800, f800, 0u32);
+impl_bench!(b_f1600, f1600, 0u64);
+
+#[bench]
+fn b_p1600_24(b: &mut test::Bencher) {
+    let mut data = [0u64; 25];
+    b.iter(|| p1600(&mut data, 24));
+}
+
+#[bench]
+fn b_p1600_16(b: &mut test::Bencher) {
+    let mut data = [0u64; 25];
+    b.iter(|| p1600(&mut data, 16));
+}
+
+#[cfg(feature = "simd")]
+mod simd {
+    use keccak::simd::{f1600x2, f1600x4, f1600x8, u64x2, u64x4, u64x8};
+
+    impl_bench!(b_f1600x2, f1600x2, u64x2::splat(0));
+    impl_bench!(b_f1600x4, f1600x4, u64x4::splat(0));
+    impl_bench!(b_f1600x8, f1600x8, u64x8::splat(0));
+}
diff --git a/contracts/vesting_curves/vendor/keccak-0.1.5/src/armv8.rs b/contracts/vesting_curves/vendor/keccak-0.1.5/src/armv8.rs
new file mode 100644
index 0000000..698c8a1
--- /dev/null
+++ b/contracts/vesting_curves/vendor/keccak-0.1.5/src/armv8.rs
@@ -0,0 +1,192 @@
+/// Keccak-p1600 on ARMv8.4-A with FEAT_SHA3.
+///
+/// See p. K12.2.2  p. 11,749 of the ARM Reference manual.
+/// Adapted from the Keccak-f1600 implementation in the XKCP/K12.
+/// see <https://github.com/XKCP/K12/blob/df6a21e6d1f34c1aa36e8d702540899c97dba5a0/lib/ARMv8Asha3/KeccakP-1600-ARMv8Asha3.S#L69>
+#[target_feature(enable = "sha3")]
+pub unsafe fn p1600_armv8_sha3_asm(state: &mut [u64; 25], round_count: usize) {
+    core::arch::asm!("
+        // Read state
+        ld1.1d {{ v0- v3}}, [x0], #32
+        ld1.1d {{ v4- v7}}, [x0], #32
+        ld1.1d {{ v8-v11}}, [x0], #32
+        ld1.1d {{v12-v15}}, [x0], #32
+        ld1.1d {{v16-v19}}, [x0], #32
+        ld1.1d {{v20-v23}}, [x0], #32
+        ld1.1d {{v24}},     [x0]
+        sub x0, x0, #192
+
+        // NOTE: This loop actually computes two f1600 functions in
+        // parallel, in both the lower and the upper 64-bit of the
+        // 128-bit registers v0-v24.
+    0:  sub	x8, x8, #1
+
+        // Theta Calculations
+        eor3.16b   v25, v20, v15, v10
+        eor3.16b   v26, v21, v16, v11
+        eor3.16b   v27, v22, v17, v12
+        eor3.16b   v28, v23, v18, v13
+        eor3.16b   v29, v24, v19, v14
+        eor3.16b   v25, v25,  v5,  v0
+        eor3.16b   v26, v26,  v6,  v1
+        eor3.16b   v27, v27,  v7,  v2
+        eor3.16b   v28, v28,  v8,  v3
+        eor3.16b   v29, v29,  v9,  v4
+        rax1.2d    v30, v25, v27
+        rax1.2d    v31, v26, v28
+        rax1.2d    v27, v27, v29
+        rax1.2d    v28, v28, v25
+        rax1.2d    v29, v29, v26
+
+        // Rho and Phi
+        eor.16b     v0,  v0, v29
+        xar.2d     v25,  v1, v30, #64 -  1
+        xar.2d      v1,  v6, v30, #64 - 44
+        xar.2d      v6,  v9, v28, #64 - 20
+        xar.2d      v9, v22, v31, #64 - 61
+        xar.2d     v22, v14, v28, #64 - 39
+        xar.2d     v14, v20, v29, #64 - 18
+        xar.2d     v26,  v2, v31, #64 - 62
+        xar.2d      v2, v12, v31, #64 - 43
+        xar.2d     v12, v13, v27, #64 - 25
+        xar.2d     v13, v19, v28, #64 -  8
+        xar.2d     v19, v23, v27, #64 - 56
+        xar.2d     v23, v15, v29, #64 - 41
+        xar.2d     v15,  v4, v28, #64 - 27
+        xar.2d     v28, v24, v28, #64 - 14
+        xar.2d     v24, v21, v30, #64 -  2
+        xar.2d      v8,  v8, v27, #64 - 55
+        xar.2d      v4, v16, v30, #64 - 45
+        xar.2d     v16,  v5, v29, #64 - 36
+        xar.2d      v5,  v3, v27, #64 - 28
+        xar.2d     v27, v18, v27, #64 - 21
+        xar.2d      v3, v17, v31, #64 - 15
+        xar.2d     v30, v11, v30, #64 - 10
+        xar.2d     v31,  v7, v31, #64 -  6
+        xar.2d     v29, v10, v29, #64 -  3
+
+        // Chi and Iota
+        bcax.16b   v20, v26, v22,  v8
+        bcax.16b   v21,  v8, v23, v22
+        bcax.16b   v22, v22, v24, v23
+        bcax.16b   v23, v23, v26, v24
+        bcax.16b   v24, v24,  v8, v26
+
+        ld1r.2d    {{v26}}, [x1], #8
+
+        bcax.16b   v17, v30, v19,  v3
+        bcax.16b   v18,  v3, v15, v19
+        bcax.16b   v19, v19, v16, v15
+        bcax.16b   v15, v15, v30, v16
+        bcax.16b   v16, v16,  v3, v30
+
+        bcax.16b   v10, v25, v12, v31
+        bcax.16b   v11, v31, v13, v12
+        bcax.16b   v12, v12, v14, v13
+        bcax.16b   v13, v13, v25, v14
+        bcax.16b   v14, v14, v31, v25
+
+        bcax.16b    v7, v29,  v9,  v4
+        bcax.16b    v8,  v4,  v5,  v9
+        bcax.16b    v9,  v9,  v6,  v5
+        bcax.16b    v5,  v5, v29,  v6
+        bcax.16b    v6,  v6,  v4, v29
+
+        bcax.16b    v3, v27,  v0, v28
+        bcax.16b    v4, v28,  v1,  v0
+        bcax.16b    v0,  v0,  v2,  v1
+        bcax.16b    v1,  v1, v27,  v2
+        bcax.16b    v2,  v2, v28, v27
+
+        eor.16b v0,v0,v26
+
+        // Rounds loop
+        cbnz    w8, 0b
+
+        // Write state
+        st1.1d	{{ v0- v3}}, [x0], #32
+        st1.1d	{{ v4- v7}}, [x0], #32
+        st1.1d	{{ v8-v11}}, [x0], #32
+        st1.1d	{{v12-v15}}, [x0], #32
+        st1.1d	{{v16-v19}}, [x0], #32
+        st1.1d	{{v20-v23}}, [x0], #32
+        st1.1d	{{v24}},     [x0]
+    ",
+        in("x0") state.as_mut_ptr(),
+        in("x1") crate::RC[24-round_count..].as_ptr(),
+        in("x8") round_count,
+        clobber_abi("C"),
+        options(nostack)
+    );
+}
+
+#[cfg(all(test, target_feature = "sha3"))]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn test_keccak_f1600() {
+        // Test vectors are copied from XKCP (eXtended Keccak Code Package)
+        // https://github.com/XKCP/XKCP/blob/master/tests/TestVectors/KeccakF-1600-IntermediateValues.txt
+        let state_first = [
+            0xF1258F7940E1DDE7,
+            0x84D5CCF933C0478A,
+            0xD598261EA65AA9EE,
+            0xBD1547306F80494D,
+            0x8B284E056253D057,
+            0xFF97A42D7F8E6FD4,
+            0x90FEE5A0A44647C4,
+            0x8C5BDA0CD6192E76,
+            0xAD30A6F71B19059C,
+            0x30935AB7D08FFC64,
+            0xEB5AA93F2317D635,
+            0xA9A6E6260D712103,
+            0x81A57C16DBCF555F,
+            0x43B831CD0347C826,
+            0x01F22F1A11A5569F,
+            0x05E5635A21D9AE61,
+            0x64BEFEF28CC970F2,
+            0x613670957BC46611,
+            0xB87C5A554FD00ECB,
+            0x8C3EE88A1CCF32C8,
+            0x940C7922AE3A2614,
+            0x1841F924A2C509E4,
+            0x16F53526E70465C2,
+            0x75F644E97F30A13B,
+            0xEAF1FF7B5CECA249,
+        ];
+        let state_second = [
+            0x2D5C954DF96ECB3C,
+            0x6A332CD07057B56D,
+            0x093D8D1270D76B6C,
+            0x8A20D9B25569D094,
+            0x4F9C4F99E5E7F156,
+            0xF957B9A2DA65FB38,
+            0x85773DAE1275AF0D,
+            0xFAF4F247C3D810F7,
+            0x1F1B9EE6F79A8759,
+            0xE4FECC0FEE98B425,
+            0x68CE61B6B9CE68A1,
+            0xDEEA66C4BA8F974F,
+            0x33C43D836EAFB1F5,
+            0xE00654042719DBD9,
+            0x7CF8A9F009831265,
+            0xFD5449A6BF174743,
+            0x97DDAD33D8994B40,
+            0x48EAD5FC5D0BE774,
+            0xE3B8C8EE55B7B03C,
+            0x91A0226E649E42E9,
+            0x900E3129E7BADD7B,
+            0x202A9EC5FAA3CCE8,
+            0x5B3402464E1C3DB6,
+            0x609F4E62A44C1059,
+            0x20D06CD26A8FBF5C,
+        ];
+
+        let mut state = [0u64; 25];
+        unsafe { p1600_armv8_sha3_asm(&mut state, 24) };
+        assert_eq!(state, state_first);
+        unsafe { p1600_armv8_sha3_asm(&mut state, 24) };
+        assert_eq!(state, state_second);
+    }
+}
diff --git a/contracts/vesting_curves/vendor/keccak-0.1.5/src/lib.rs b/contracts/vesting_curves/vendor/keccak-0.1.5/src/lib.rs
new file mode 100644
index 0000000..dc18ea3
--- /dev/null
+++ b/contracts/vesting_curves/vendor/keccak-0.1.5/src/lib.rs
@@ -0,0 +1,498 @@
+//! Keccak [sponge function](https://en.wikipedia.org/wiki/Sponge_function).
+//!
+//! If you are looking for SHA-3 hash functions take a look at [`sha3`][1] and
+//! [`tiny-keccak`][2] crates.
+//!
+//! To disable loop unrolling (e.g. for constraint targets) use `no_unroll`
+//! feature.
+//!
+//! ```
+//! // Test vectors are from KeccakCodePackage
+//! let mut data = [0u64; 25];
+//!
+//! keccak::f1600(&mut data);
+//! assert_eq!(data, [
+//!     0xF1258F7940E1DDE7, 0x84D5CCF933C0478A, 0xD598261EA65AA9EE, 0xBD1547306F80494D,
+//!     0x8B284E056253D057, 0xFF97A42D7F8E6FD4, 0x90FEE5A0A44647C4, 0x8C5BDA0CD6192E76,
+//!     0xAD30A6F71B19059C, 0x30935AB7D08FFC64, 0xEB5AA93F2317D635, 0xA9A6E6260D712103,
+//!     0x81A57C16DBCF555F, 0x43B831CD0347C826, 0x01F22F1A11A5569F, 0x05E5635A21D9AE61,
+//!     0x64BEFEF28CC970F2, 0x613670957BC46611, 0xB87C5A554FD00ECB, 0x8C3EE88A1CCF32C8,
+//!     0x940C7922AE3A2614, 0x1841F924A2C509E4, 0x16F53526E70465C2, 0x75F644E97F30A13B,
+//!     0xEAF1FF7B5CECA249,
+//! ]);
+//!
+//! keccak::f1600(&mut data);
+//! assert_eq!(data, [
+//!     0x2D5C954DF96ECB3C, 0x6A332CD07057B56D, 0x093D8D1270D76B6C, 0x8A20D9B25569D094,
+//!     0x4F9C4F99E5E7F156, 0xF957B9A2DA65FB38, 0x85773DAE1275AF0D, 0xFAF4F247C3D810F7,
+//!     0x1F1B9EE6F79A8759, 0xE4FECC0FEE98B425, 0x68CE61B6B9CE68A1, 0xDEEA66C4BA8F974F,
+//!     0x33C43D836EAFB1F5, 0xE00654042719DBD9, 0x7CF8A9F009831265, 0xFD5449A6BF174743,
+//!     0x97DDAD33D8994B40, 0x48EAD5FC5D0BE774, 0xE3B8C8EE55B7B03C, 0x91A0226E649E42E9,
+//!     0x900E3129E7BADD7B, 0x202A9EC5FAA3CCE8, 0x5B3402464E1C3DB6, 0x609F4E62A44C1059,
+//!     0x20D06CD26A8FBF5C,
+//! ]);
+//! ```
+//!
+//! [1]: https://docs.rs/sha3
+//! [2]: https://docs.rs/tiny-keccak
+
+#![no_std]
+#![cfg_attr(docsrs, feature(doc_auto_cfg))]
+#![cfg_attr(feature = "simd", feature(portable_simd))]
+#![doc(
+    html_logo_url = "https://raw.githubusercontent.com/RustCrypto/meta/master/logo.svg",
+    html_favicon_url = "https://raw.githubusercontent.com/RustCrypto/meta/master/logo.svg"
+)]
+#![allow(non_upper_case_globals)]
+#![warn(
+    clippy::mod_module_files,
+    clippy::unwrap_used,
+    missing_docs,
+    rust_2018_idioms,
+    unused_lifetimes,
+    unused_qualifications
+)]
+
+use core::{
+    convert::TryInto,
+    fmt::Debug,
+    mem::size_of,
+    ops::{BitAnd, BitAndAssign, BitXor, BitXorAssign, Not},
+};
+
+#[rustfmt::skip]
+mod unroll;
+
+#[cfg(all(target_arch = "aarch64", feature = "asm"))]
+mod armv8;
+
+#[cfg(all(target_arch = "aarch64", feature = "asm"))]
+cpufeatures::new!(armv8_sha3_intrinsics, "sha3");
+
+const PLEN: usize = 25;
+
+const RHO: [u32; 24] = [
+    1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 2, 14, 27, 41, 56, 8, 25, 43, 62, 18, 39, 61, 20, 44,
+];
+
+const PI: [usize; 24] = [
+    10, 7, 11, 17, 18, 3, 5, 16, 8, 21, 24, 4, 15, 23, 19, 13, 12, 2, 20, 14, 22, 9, 6, 1,
+];
+
+const RC: [u64; 24] = [
+    0x0000000000000001,
+    0x0000000000008082,
+    0x800000000000808a,
+    0x8000000080008000,
+    0x000000000000808b,
+    0x0000000080000001,
+    0x8000000080008081,
+    0x8000000000008009,
+    0x000000000000008a,
+    0x0000000000000088,
+    0x0000000080008009,
+    0x000000008000000a,
+    0x000000008000808b,
+    0x800000000000008b,
+    0x8000000000008089,
+    0x8000000000008003,
+    0x8000000000008002,
+    0x8000000000000080,
+    0x000000000000800a,
+    0x800000008000000a,
+    0x8000000080008081,
+    0x8000000000008080,
+    0x0000000080000001,
+    0x8000000080008008,
+];
+
+/// Keccak is a permutation over an array of lanes which comprise the sponge
+/// construction.
+pub trait LaneSize:
+    Copy
+    + Clone
+    + Debug
+    + Default
+    + PartialEq
+    + BitAndAssign
+    + BitAnd<Output = Self>
+    + BitXorAssign
+    + BitXor<Output = Self>
+    + Not<Output = Self>
+{
+    /// Number of rounds of the Keccak-f permutation.
+    const KECCAK_F_ROUND_COUNT: usize;
+
+    /// Truncate function.
+    fn truncate_rc(rc: u64) -> Self;
+
+    /// Rotate left function.
+    fn rotate_left(self, n: u32) -> Self;
+}
+
+macro_rules! impl_lanesize {
+    ($type:ty, $round:expr, $truncate:expr) => {
+        impl LaneSize for $type {
+            const KECCAK_F_ROUND_COUNT: usize = $round;
+
+            fn truncate_rc(rc: u64) -> Self {
+                $truncate(rc)
+            }
+
+            fn rotate_left(self, n: u32) -> Self {
+                self.rotate_left(n)
+            }
+        }
+    };
+}
+
+impl_lanesize!(u8, 18, |rc: u64| { rc.to_le_bytes()[0] });
+impl_lanesize!(u16, 20, |rc: u64| {
+    let tmp = rc.to_le_bytes();
+    #[allow(clippy::unwrap_used)]
+    Self::from_le_bytes(tmp[..size_of::<Self>()].try_into().unwrap())
+});
+impl_lanesize!(u32, 22, |rc: u64| {
+    let tmp = rc.to_le_bytes();
+    #[allow(clippy::unwrap_used)]
+    Self::from_le_bytes(tmp[..size_of::<Self>()].try_into().unwrap())
+});
+impl_lanesize!(u64, 24, |rc: u64| { rc });
+
+macro_rules! impl_keccak {
+    ($pname:ident, $fname:ident, $type:ty) => {
+        /// Keccak-p sponge function
+        pub fn $pname(state: &mut [$type; PLEN], round_count: usize) {
+            keccak_p(state, round_count);
+        }
+
+        /// Keccak-f sponge function
+        pub fn $fname(state: &mut [$type; PLEN]) {
+            keccak_p(state, <$type>::KECCAK_F_ROUND_COUNT);
+        }
+    };
+}
+
+impl_keccak!(p200, f200, u8);
+impl_keccak!(p400, f400, u16);
+impl_keccak!(p800, f800, u32);
+
+#[cfg(not(all(target_arch = "aarch64", feature = "asm")))]
+impl_keccak!(p1600, f1600, u64);
+
+/// Keccak-p[1600, rc] permutation.
+#[cfg(all(target_arch = "aarch64", feature = "asm"))]
+pub fn p1600(state: &mut [u64; PLEN], round_count: usize) {
+    if armv8_sha3_intrinsics::get() {
+        unsafe { armv8::p1600_armv8_sha3_asm(state, round_count) }
+    } else {
+        keccak_p(state, round_count);
+    }
+}
+
+/// Keccak-f[1600] permutation.
+#[cfg(all(target_arch = "aarch64", feature = "asm"))]
+pub fn f1600(state: &mut [u64; PLEN]) {
+    if armv8_sha3_intrinsics::get() {
+        unsafe { armv8::p1600_armv8_sha3_asm(state, 24) }
+    } else {
+        keccak_p(state, u64::KECCAK_F_ROUND_COUNT);
+    }
+}
+
+#[cfg(feature = "simd")]
+/// SIMD implementations for Keccak-f1600 sponge function
+pub mod simd {
+    use crate::{keccak_p, LaneSize, PLEN};
+    pub use core::simd::{u64x2, u64x4, u64x8};
+
+    macro_rules! impl_lanesize_simd_u64xn {
+        ($type:ty) => {
+            impl LaneSize for $type {
+                const KECCAK_F_ROUND_COUNT: usize = 24;
+
+                fn truncate_rc(rc: u64) -> Self {
+                    Self::splat(rc)
+                }
+
+                fn rotate_left(self, n: u32) -> Self {
+                    self << Self::splat(n.into()) | self >> Self::splat((64 - n).into())
+                }
+            }
+        };
+    }
+
+    impl_lanesize_simd_u64xn!(u64x2);
+    impl_lanesize_simd_u64xn!(u64x4);
+    impl_lanesize_simd_u64xn!(u64x8);
+
+    impl_keccak!(p1600x2, f1600x2, u64x2);
+    impl_keccak!(p1600x4, f1600x4, u64x4);
+    impl_keccak!(p1600x8, f1600x8, u64x8);
+}
+
+#[allow(unused_assignments)]
+/// Generic Keccak-p sponge function
+pub fn keccak_p<L: LaneSize>(state: &mut [L; PLEN], round_count: usize) {
+    if round_count > L::KECCAK_F_ROUND_COUNT {
+        panic!("A round_count greater than KECCAK_F_ROUND_COUNT is not supported!");
+    }
+
+    // https://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf#page=25
+    // "the rounds of KECCAK-p[b, nr] match the last rounds of KECCAK-f[b]"
+    let round_consts = &RC[(L::KECCAK_F_ROUND_COUNT - round_count)..L::KECCAK_F_ROUND_COUNT];
+
+    // not unrolling this loop results in a much smaller function, plus
+    // it positively influences performance due to the smaller load on I-cache
+    for &rc in round_consts {
+        let mut array = [L::default(); 5];
+
+        // Theta
+        unroll5!(x, {
+            unroll5!(y, {
+                array[x] ^= state[5 * y + x];
+            });
+        });
+
+        unroll5!(x, {
+            unroll5!(y, {
+                let t1 = array[(x + 4) % 5];
+                let t2 = array[(x + 1) % 5].rotate_left(1);
+                state[5 * y + x] ^= t1 ^ t2;
+            });
+        });
+
+        // Rho and pi
+        let mut last = state[1];
+        unroll24!(x, {
+            array[0] = state[PI[x]];
+            state[PI[x]] = last.rotate_left(RHO[x]);
+            last = array[0];
+        });
+
+        // Chi
+        unroll5!(y_step, {
+            let y = 5 * y_step;
+
+            unroll5!(x, {
+                array[x] = state[y + x];
+            });
+
+            unroll5!(x, {
+                let t1 = !array[(x + 1) % 5];
+                let t2 = array[(x + 2) % 5];
+                state[y + x] = array[x] ^ (t1 & t2);
+            });
+        });
+
+        // Iota
+        state[0] ^= L::truncate_rc(rc);
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::{keccak_p, LaneSize, PLEN};
+
+    fn keccak_f<L: LaneSize>(state_first: [L; PLEN], state_second: [L; PLEN]) {
+        let mut state = [L::default(); PLEN];
+
+        keccak_p(&mut state, L::KECCAK_F_ROUND_COUNT);
+        assert_eq!(state, state_first);
+
+        keccak_p(&mut state, L::KECCAK_F_ROUND_COUNT);
+        assert_eq!(state, state_second);
+    }
+
+    #[test]
+    fn keccak_f200() {
+        // Test vectors are copied from XKCP (eXtended Keccak Code Package)
+        // https://github.com/XKCP/XKCP/blob/master/tests/TestVectors/KeccakF-200-IntermediateValues.txt
+        let state_first = [
+            0x3C, 0x28, 0x26, 0x84, 0x1C, 0xB3, 0x5C, 0x17, 0x1E, 0xAA, 0xE9, 0xB8, 0x11, 0x13,
+            0x4C, 0xEA, 0xA3, 0x85, 0x2C, 0x69, 0xD2, 0xC5, 0xAB, 0xAF, 0xEA,
+        ];
+        let state_second = [
+            0x1B, 0xEF, 0x68, 0x94, 0x92, 0xA8, 0xA5, 0x43, 0xA5, 0x99, 0x9F, 0xDB, 0x83, 0x4E,
+            0x31, 0x66, 0xA1, 0x4B, 0xE8, 0x27, 0xD9, 0x50, 0x40, 0x47, 0x9E,
+        ];
+
+        keccak_f::<u8>(state_first, state_second);
+    }
+
+    #[test]
+    fn keccak_f400() {
+        // Test vectors are copied from XKCP (eXtended Keccak Code Package)
+        // https://github.com/XKCP/XKCP/blob/master/tests/TestVectors/KeccakF-400-IntermediateValues.txt
+        let state_first = [
+            0x09F5, 0x40AC, 0x0FA9, 0x14F5, 0xE89F, 0xECA0, 0x5BD1, 0x7870, 0xEFF0, 0xBF8F, 0x0337,
+            0x6052, 0xDC75, 0x0EC9, 0xE776, 0x5246, 0x59A1, 0x5D81, 0x6D95, 0x6E14, 0x633E, 0x58EE,
+            0x71FF, 0x714C, 0xB38E,
+        ];
+        let state_second = [
+            0xE537, 0xD5D6, 0xDBE7, 0xAAF3, 0x9BC7, 0xCA7D, 0x86B2, 0xFDEC, 0x692C, 0x4E5B, 0x67B1,
+            0x15AD, 0xA7F7, 0xA66F, 0x67FF, 0x3F8A, 0x2F99, 0xE2C2, 0x656B, 0x5F31, 0x5BA6, 0xCA29,
+            0xC224, 0xB85C, 0x097C,
+        ];
+
+        keccak_f::<u16>(state_first, state_second);
+    }
+
+    #[test]
+    fn keccak_f800() {
+        // Test vectors are copied from XKCP (eXtended Keccak Code Package)
+        // https://github.com/XKCP/XKCP/blob/master/tests/TestVectors/KeccakF-800-IntermediateValues.txt
+        let state_first = [
+            0xE531D45D, 0xF404C6FB, 0x23A0BF99, 0xF1F8452F, 0x51FFD042, 0xE539F578, 0xF00B80A7,
+            0xAF973664, 0xBF5AF34C, 0x227A2424, 0x88172715, 0x9F685884, 0xB15CD054, 0x1BF4FC0E,
+            0x6166FA91, 0x1A9E599A, 0xA3970A1F, 0xAB659687, 0xAFAB8D68, 0xE74B1015, 0x34001A98,
+            0x4119EFF3, 0x930A0E76, 0x87B28070, 0x11EFE996,
+        ];
+        let state_second = [
+            0x75BF2D0D, 0x9B610E89, 0xC826AF40, 0x64CD84AB, 0xF905BDD6, 0xBC832835, 0x5F8001B9,
+            0x15662CCE, 0x8E38C95E, 0x701FE543, 0x1B544380, 0x89ACDEFF, 0x51EDB5DE, 0x0E9702D9,
+            0x6C19AA16, 0xA2913EEE, 0x60754E9A, 0x9819063C, 0xF4709254, 0xD09F9084, 0x772DA259,
+            0x1DB35DF7, 0x5AA60162, 0x358825D5, 0xB3783BAB,
+        ];
+
+        keccak_f::<u32>(state_first, state_second);
+    }
+
+    #[test]
+    fn keccak_f1600() {
+        // Test vectors are copied from XKCP (eXtended Keccak Code Package)
+        // https://github.com/XKCP/XKCP/blob/master/tests/TestVectors/KeccakF-1600-IntermediateValues.txt
+        let state_first = [
+            0xF1258F7940E1DDE7,
+            0x84D5CCF933C0478A,
+            0xD598261EA65AA9EE,
+            0xBD1547306F80494D,
+            0x8B284E056253D057,
+            0xFF97A42D7F8E6FD4,
+            0x90FEE5A0A44647C4,
+            0x8C5BDA0CD6192E76,
+            0xAD30A6F71B19059C,
+            0x30935AB7D08FFC64,
+            0xEB5AA93F2317D635,
+            0xA9A6E6260D712103,
+            0x81A57C16DBCF555F,
+            0x43B831CD0347C826,
+            0x01F22F1A11A5569F,
+            0x05E5635A21D9AE61,
+            0x64BEFEF28CC970F2,
+            0x613670957BC46611,
+            0xB87C5A554FD00ECB,
+            0x8C3EE88A1CCF32C8,
+            0x940C7922AE3A2614,
+            0x1841F924A2C509E4,
+            0x16F53526E70465C2,
+            0x75F644E97F30A13B,
+            0xEAF1FF7B5CECA249,
+        ];
+        let state_second = [
+            0x2D5C954DF96ECB3C,
+            0x6A332CD07057B56D,
+            0x093D8D1270D76B6C,
+            0x8A20D9B25569D094,
+            0x4F9C4F99E5E7F156,
+            0xF957B9A2DA65FB38,
+            0x85773DAE1275AF0D,
+            0xFAF4F247C3D810F7,
+            0x1F1B9EE6F79A8759,
+            0xE4FECC0FEE98B425,
+            0x68CE61B6B9CE68A1,
+            0xDEEA66C4BA8F974F,
+            0x33C43D836EAFB1F5,
+            0xE00654042719DBD9,
+            0x7CF8A9F009831265,
+            0xFD5449A6BF174743,
+            0x97DDAD33D8994B40,
+            0x48EAD5FC5D0BE774,
+            0xE3B8C8EE55B7B03C,
+            0x91A0226E649E42E9,
+            0x900E3129E7BADD7B,
+            0x202A9EC5FAA3CCE8,
+            0x5B3402464E1C3DB6,
+            0x609F4E62A44C1059,
+            0x20D06CD26A8FBF5C,
+        ];
+
+        keccak_f::<u64>(state_first, state_second);
+    }
+
+    #[cfg(feature = "simd")]
+    mod simd {
+        use super::keccak_f;
+        use core::simd::{u64x2, u64x4, u64x8};
+
+        macro_rules! impl_keccak_f1600xn {
+            ($name:ident, $type:ty) => {
+                #[test]
+                fn $name() {
+                    // Test vectors are copied from XKCP (eXtended Keccak Code Package)
+                    // https://github.com/XKCP/XKCP/blob/master/tests/TestVectors/KeccakF-1600-IntermediateValues.txt
+                    let state_first = [
+                        <$type>::splat(0xF1258F7940E1DDE7),
+                        <$type>::splat(0x84D5CCF933C0478A),
+                        <$type>::splat(0xD598261EA65AA9EE),
+                        <$type>::splat(0xBD1547306F80494D),
+                        <$type>::splat(0x8B284E056253D057),
+                        <$type>::splat(0xFF97A42D7F8E6FD4),
+                        <$type>::splat(0x90FEE5A0A44647C4),
+                        <$type>::splat(0x8C5BDA0CD6192E76),
+                        <$type>::splat(0xAD30A6F71B19059C),
+                        <$type>::splat(0x30935AB7D08FFC64),
+                        <$type>::splat(0xEB5AA93F2317D635),
+                        <$type>::splat(0xA9A6E6260D712103),
+                        <$type>::splat(0x81A57C16DBCF555F),
+                        <$type>::splat(0x43B831CD0347C826),
+                        <$type>::splat(0x01F22F1A11A5569F),
+                        <$type>::splat(0x05E5635A21D9AE61),
+                        <$type>::splat(0x64BEFEF28CC970F2),
+                        <$type>::splat(0x613670957BC46611),
+                        <$type>::splat(0xB87C5A554FD00ECB),
+                        <$type>::splat(0x8C3EE88A1CCF32C8),
+                        <$type>::splat(0x940C7922AE3A2614),
+                        <$type>::splat(0x1841F924A2C509E4),
+                        <$type>::splat(0x16F53526E70465C2),
+                        <$type>::splat(0x75F644E97F30A13B),
+                        <$type>::splat(0xEAF1FF7B5CECA249),
+                    ];
+                    let state_second = [
+                        <$type>::splat(0x2D5C954DF96ECB3C),
+                        <$type>::splat(0x6A332CD07057B56D),
+                        <$type>::splat(0x093D8D1270D76B6C),
+                        <$type>::splat(0x8A20D9B25569D094),
+                        <$type>::splat(0x4F9C4F99E5E7F156),
+                        <$type>::splat(0xF957B9A2DA65FB38),
+                        <$type>::splat(0x85773DAE1275AF0D),
+                        <$type>::splat(0xFAF4F247C3D810F7),
+                        <$type>::splat(0x1F1B9EE6F79A8759),
+                        <$type>::splat(0xE4FECC0FEE98B425),
+                        <$type>::splat(0x68CE61B6B9CE68A1),
+                        <$type>::splat(0xDEEA66C4BA8F974F),
+                        <$type>::splat(0x33C43D836EAFB1F5),
+                        <$type>::splat(0xE00654042719DBD9),
+                        <$type>::splat(0x7CF8A9F009831265),
+                        <$type>::splat(0xFD5449A6BF174743),
+                        <$type>::splat(0x97DDAD33D8994B40),
+                        <$type>::splat(0x48EAD5FC5D0BE774),
+                        <$type>::splat(0xE3B8C8EE55B7B03C),
+                        <$type>::splat(0x91A0226E649E42E9),
+                        <$type>::splat(0x900E3129E7BADD7B),
+                        <$type>::splat(0x202A9EC5FAA3CCE8),
+                        <$type>::splat(0x5B3402464E1C3DB6),
+                        <$type>::splat(0x609F4E62A44C1059),
+                        <$type>::splat(0x20D06CD26A8FBF5C),
+                    ];
+
+                    keccak_f::<$type>(state_first, state_second);
+                }
+            };
+        }
+
+        impl_keccak_f1600xn!(keccak_f1600x2, u64x2);
+        impl_keccak_f1600xn!(keccak_f1600x4, u64x4);
+        impl_keccak_f1600xn!(keccak_f1600x8, u64x8);
+    }
+}
diff --git a/contracts/vesting_curves/vendor/keccak-0.1.5/src/unroll.rs b/contracts/vesting_curves/vendor/keccak-0.1.5/src/unroll.rs
new file mode 100644
index 0000000..eab745b
--- /dev/null
+++ b/contracts/vesting_curves/vendor/keccak-0.1.5/src/unroll.rs
@@ -0,0 +1,62 @@
+/// unroll5
+#[cfg(not(feature = "no_unroll"))]
+#[macro_export]
+macro_rules! unroll5 {
+    ($var:ident, $body:block) => {
+        { const $var: usize = 0; $body; }
+        { const $var: usize = 1; $body; }
+        { const $var: usize = 2; $body; }
+        { const $var: usize = 3; $body; }
+        { const $var: usize = 4; $body; }
+    };
+}
+
+/// unroll5
+#[cfg(feature = "no_unroll")]
+#[macro_export]
+macro_rules! unroll5 {
+    ($var:ident, $body:block) => {
+        for $var in 0..5 $body
+    }
+}
+
+/// unroll24
+#[cfg(not(feature = "no_unroll"))]
+#[macro_export]
+macro_rules! unroll24 {
+    ($var: ident, $body: block) => {
+        { const $var: usize = 0; $body; }
+        { const $var: usize = 1; $body; }
+        { const $var: usize = 2; $body; }
+        { const $var: usize = 3; $body; }
+        { const $var: usize = 4; $body; }
+        { const $var: usize = 5; $body; }
+        { const $var: usize = 6; $body; }
+        { const $var: usize = 7; $body; }
+        { const $var: usize = 8; $body; }
+        { const $var: usize = 9; $body; }
+        { const $var: usize = 10; $body; }
+        { const $var: usize = 11; $body; }
+        { const $var: usize = 12; $body; }
+        { const $var: usize = 13; $body; }
+        { const $var: usize = 14; $body; }
+        { const $var: usize = 15; $body; }
+        { const $var: usize = 16; $body; }
+        { const $var: usize = 17; $body; }
+        { const $var: usize = 18; $body; }
+        { const $var: usize = 19; $body; }
+        { const $var: usize = 20; $body; }
+        { const $var: usize = 21; $body; }
+        { const $var: usize = 22; $body; }
+        { const $var: usize = 23; $body; }
+    };
+}
+
+/// unroll24
+#[cfg(feature = "no_unroll")]
+#[macro_export]
+macro_rules! unroll24 {
+    ($var:ident, $body:block) => {
+        for $var in 0..24 $body
+    }
+}