File 0002-Fix-SHA256-bug-due-to-strict-aliasing-violations-wit.patch of Package libnbcompat

From b6509283cbf8043990ea9e31ca22fc7495a1ca99 Mon Sep 17 00:00:00 2001
From: "Archie L. Cobbs" <archie.cobbs@gmail.com>
Date: Wed, 7 Jun 2023 10:20:20 -0500
Subject: [PATCH 2/2] Fix SHA256 bug due to strict aliasing violations with
 newer GCC optimizations (#4).

SUSE-Backport: commit 864c1cf42c2c ("Fix SHA256 bug due to strict aliasing violations with newer GCC optimizations (#4).")

---
 CHANGES | 5 +++++
 sha2.c  | 6 +++---
 2 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/CHANGES b/CHANGES
index e30ebc71d718..0e8c1a905714 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,8 @@
+Version Next
+
+    - Fixed SHA256 bug due to strict aliasing violations with newer GCC optimizations (#4).
+    - Add hash test vectors (contributed by Aleksa Sarai)
+
 Version 1.0.1 released August 29, 2020
 
     - Avoid defining PACKAGE, etc. in installed header files
diff --git a/sha2.c b/sha2.c
index 62ad72f5e3e9..2a7ed2ba5d21 100644
--- a/sha2.c
+++ b/sha2.c
@@ -567,7 +567,7 @@ void SHA256_Final(sha2_byte digest[], SHA256_CTX* context) {
 			*context->buffer = 0x80;
 		}
 		/* Set the bit count: */
-		*(sha2_word64*)(void *)&context->buffer[SHA256_SHORT_BLOCK_LENGTH] = context->bitcount;
+		memcpy(&context->buffer[SHA256_SHORT_BLOCK_LENGTH], &context->bitcount, sizeof(context->bitcount));
 
 		/* Final transform: */
 		SHA256_Transform(context, (sha2_word32*)(void *)context->buffer);
@@ -870,8 +870,8 @@ static void SHA512_Last(SHA512_CTX* context) {
 		*context->buffer = 0x80;
 	}
 	/* Store the length of input data (in bits): */
-	*(sha2_word64*)(void *)&context->buffer[SHA512_SHORT_BLOCK_LENGTH] = context->bitcount[1];
-	*(sha2_word64*)(void *)&context->buffer[SHA512_SHORT_BLOCK_LENGTH+8] = context->bitcount[0];
+	memcpy(&context->buffer[SHA512_SHORT_BLOCK_LENGTH], &context->bitcount[1], sizeof(context->bitcount[1]));
+	memcpy(&context->buffer[SHA512_SHORT_BLOCK_LENGTH+8], &context->bitcount[0], sizeof(context->bitcount[0]));
 
 	/* Final transform: */
 	SHA512_Transform(context, (sha2_word64*)(void *)context->buffer);
-- 
2.40.1