Use crypto_add_u32dw_u64() to increment SHA-256 message bit counter.

ok kenjiro@ tb@

1 files changed, 3 insertions, 9 deletions

diff --git a/src/lib/libcrypto/sha/sha256.c b/src/lib/libcrypto/sha/sha256.c
index f60073bf76..f03475e86d 100644
--- a/src/lib/libcrypto/sha/sha256.c
+++ b/src/lib/libcrypto/sha/sha256.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sha256.c,v 1.34 2026/04/25 05:47:03 jsing Exp $ */
+/* $OpenBSD: sha256.c,v 1.35 2026/05/09 07:08:43 jsing Exp $ */
 /* ====================================================================
  * Copyright (c) 1998-2011 The OpenSSL Project.  All rights reserved.
  *
@@ -365,19 +365,13 @@ SHA256_Update(SHA256_CTX *c, const void *data_, size_t len)
 {
         const unsigned char *data = data_;
         unsigned char *p;
-        SHA_LONG l;
         size_t n;
 
         if (len == 0)
                 return 1;
 
-        l = (c->Nl + (((SHA_LONG)len) << 3)) & 0xffffffffUL;
-        /* 95-05-24 eay Fixed a bug with the overflow handling, thanks to
-         * Wei Dai <weidai@eskimo.com> for pointing it out. */
-        if (l < c->Nl) /* overflow */
-                c->Nh++;
-        c->Nh += (SHA_LONG)(len >> 29); /* might cause compiler warning on 16-bit */
-        c->Nl = l;
+        /* Update message bit counter. */
+        crypto_add_u32dw_u64(&c->Nh, &c->Nl, (uint64_t)len << 3);
 
         n = c->num;
         if (n != 0) {