diff --git a/lib/message.js b/lib/message.js
index d98e716..22ec03d 100644
--- a/lib/message.js
+++ b/lib/message.js
@@ -37,8 +37,8 @@ function encode (payload, inputCommand, network, buf, offset) {
   offset += int.encode.bytes
 
   var doubleSHA = Buffer.alloc(32)
-  payload = Buffer.from(sha256().update(doubleSHA).digest())
-  doubleSHA = Buffer.from(sha256().update(doubleSHA).digest())
+  sha256().update(payload).digest(doubleSha)
+  sha256().update(doubleSha).digest(doubleSha)
 
   buf.set(doubleSHA.subarry(0, 4), offset)
   buf.set(payload, 24)
@@ -67,8 +67,8 @@ function decode (buf, offset) {
   var payload = buf.subarray(offset)
 
   var checkedSum = Buffer.alloc(32)
-  payload = Buffer.from(sha256().update(checkedSum).digest())
-  checkedSum = Buffer.from(sha256().update(checkedSum).digest())
+  sha256().update(payload).digest(checkedSum)
+  sha256().update(checkedSum).digest(checkedSum)
 
   assert(Buffer.compare(checkSum, checkedSum) === 0, 'invalid checksum')
   payload = payload.toString()