From fe9e2566d0c0474ab121f71af221d44bb1179d14 Mon Sep 17 00:00:00 2001
From: "Kamat, Trivikram" <16024985+trivikr@users.noreply.github.com>
Date: Fri, 4 Oct 2024 16:03:48 +0000
Subject: [PATCH] fix: revert to use CRC32 for default checksum algorithm

This reverts commit aad6e6f02ffa001a3048ce150aa8a8386f38ea71.
---
 packages/middleware-flexible-checksums/src/constants.ts  | 4 ++--
 private/aws-middleware-test/src/middleware-serde.spec.ts | 2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/packages/middleware-flexible-checksums/src/constants.ts b/packages/middleware-flexible-checksums/src/constants.ts
index 688febe373994..eaa64c32ca396 100644
--- a/packages/middleware-flexible-checksums/src/constants.ts
+++ b/packages/middleware-flexible-checksums/src/constants.ts
@@ -53,7 +53,7 @@ export const DEFAULT_RESPONSE_CHECKSUM_VALIDATION = RequestChecksumCalculation.W
  */
 export enum ChecksumAlgorithm {
   /**
-   * @deprecated Use {@link ChecksumAlgorithm.SHA256} instead.
+   * @deprecated Use {@link ChecksumAlgorithm.CRC32} instead.
    */
   MD5 = "MD5",
   CRC32 = "CRC32",
@@ -73,7 +73,7 @@ export enum ChecksumLocation {
 /**
  * @internal
  */
-export const DEFAULT_CHECKSUM_ALGORITHM = ChecksumAlgorithm.SHA256;
+export const DEFAULT_CHECKSUM_ALGORITHM = ChecksumAlgorithm.CRC32;
 
 /**
  * @internal
diff --git a/private/aws-middleware-test/src/middleware-serde.spec.ts b/private/aws-middleware-test/src/middleware-serde.spec.ts
index bceb1d063fc9f..7c7ad433d698e 100644
--- a/private/aws-middleware-test/src/middleware-serde.spec.ts
+++ b/private/aws-middleware-test/src/middleware-serde.spec.ts
@@ -20,7 +20,7 @@ describe("middleware-serde", () => {
           "x-amz-acl": "private",
           "content-length": "509",
           Expect: "100-continue",
-          "x-amz-checksum-sha256": "wKiXgOGqxd+hdgTp4lYW57q7oLZV2xib5JtMNSVDuyI=",
+          "x-amz-checksum-crc32": "XnKFaw==",
           host: "s3.us-west-2.amazonaws.com",
           "x-amz-content-sha256": "c0a89780e1aac5dfa17604e9e25616e7babba0b655db189be49b4c352543bb22",
         },