From 50d56e988c085636ddb67a0901e140b5822ab07c Mon Sep 17 00:00:00 2001
From: Soumava Bera <sberas@amazon.com>
Date: Fri, 28 Mar 2025 13:23:19 -0400
Subject: [PATCH 1/2] Pick hash algorithm from http response header

---
 src/aws-cpp-sdk-core/source/http/curl/CurlHttpClient.cpp | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/aws-cpp-sdk-core/source/http/curl/CurlHttpClient.cpp b/src/aws-cpp-sdk-core/source/http/curl/CurlHttpClient.cpp
index 35c718458d5..6f61eeee133 100644
--- a/src/aws-cpp-sdk-core/source/http/curl/CurlHttpClient.cpp
+++ b/src/aws-cpp-sdk-core/source/http/curl/CurlHttpClient.cpp
@@ -214,7 +214,13 @@ static size_t WriteData(char* ptr, size_t size, size_t nmemb, void* userdata)
 
         for (const auto& hashIterator : context->m_request->GetResponseValidationHashes())
         {
+          std::stringstream headerStr;
+          headerStr<<"x-amz-checksum-"<<hashIterator.first;
+          if(context->m_response->HasHeader(headerStr.str().c_str()))
+          {
             hashIterator.second->Update(reinterpret_cast<unsigned char*>(ptr), sizeToWrite);
+            break;
+          }
         }
 
         if (response->GetResponseBody().fail()) {

From 447f0fc65af08dc2e55e5c00e39afa8c7e70da24 Mon Sep 17 00:00:00 2001
From: sbiscigl <sbiscigl@amazon.com>
Date: Fri, 4 Apr 2025 15:09:48 -0400
Subject: [PATCH 2/2] apply change to other http clients

---
 src/aws-cpp-sdk-core/source/http/crt/CRTHttpClient.cpp    | 8 +++++++-
 .../source/http/windows/WinSyncHttpClient.cpp             | 6 ++++++
 2 files changed, 13 insertions(+), 1 deletion(-)

diff --git a/src/aws-cpp-sdk-core/source/http/crt/CRTHttpClient.cpp b/src/aws-cpp-sdk-core/source/http/crt/CRTHttpClient.cpp
index c007cf6d256..4c392bdf280 100644
--- a/src/aws-cpp-sdk-core/source/http/crt/CRTHttpClient.cpp
+++ b/src/aws-cpp-sdk-core/source/http/crt/CRTHttpClient.cpp
@@ -246,13 +246,19 @@ namespace Aws
             }
 
             //TODO: handle the read rate limiter here, once back pressure is setup.
+            assert(response);
             for (const auto& hashIterator : request->GetResponseValidationHashes())
             {
+              std::stringstream headerStr;
+              headerStr<<"x-amz-checksum-"<<hashIterator.first;
+              if(response->HasHeader(headerStr.str().c_str()))
+              {
                 hashIterator.second->Update(reinterpret_cast<unsigned char*>(body.ptr), body.len);
+                break;
+              }
             }
 
             // When data is received from the content body of the incoming response, just copy it to the output stream.
-            assert(response);
             response->GetResponseBody().write((const char*)body.ptr, static_cast<long>(body.len));
             if (response->GetResponseBody().fail()) {
                 const auto& ref = response->GetResponseBody();
diff --git a/src/aws-cpp-sdk-core/source/http/windows/WinSyncHttpClient.cpp b/src/aws-cpp-sdk-core/source/http/windows/WinSyncHttpClient.cpp
index b76ff25583a..cda0078abeb 100644
--- a/src/aws-cpp-sdk-core/source/http/windows/WinSyncHttpClient.cpp
+++ b/src/aws-cpp-sdk-core/source/http/windows/WinSyncHttpClient.cpp
@@ -287,7 +287,13 @@ bool WinSyncHttpClient::BuildSuccessResponse(const std::shared_ptr<HttpRequest>&
                         {
                             for (const auto& hashIterator : request->GetResponseValidationHashes())
                             {
+                              std::stringstream headerStr;
+                              headerStr<<"x-amz-checksum-"<<hashIterator.first;
+                              if(response->HasHeader(headerStr.str().c_str()))
+                              {
                                 hashIterator.second->Update(reinterpret_cast<unsigned char*>(dst), static_cast<size_t>(read));
+                                break;
+                              }
                             }
 
                             auto& headersHandler = request->GetHeadersReceivedEventHandler();