Replace Makefile based SHA*_ASM defines with HAVE_SHA_* defines.

Currently, SHA{1,256,512}_ASM defines are used to remove the C
implementation of sha{1,256,512}_block_data_order() when it is provided
by assembly. However, this prevents the C implementation from being used
as a fallback.

Rename the C sha*_block_data_order() to sha*_block_generic() and provide
a sha*_block_data_order() that calls sha*_block_generic(). Replace the
Makefile based SHA*_ASM defines with two HAVE_SHA_* defines that allow
these functions to be compiled in or removed, such that machine specific
verisons can be provided. This should effectively be a no-op on any
platform that defined SHA{1,256,512}_ASM.

ok tb@

1 files changed, 14 insertions, 7 deletions

diff --git a/src/lib/libcrypto/sha/sha256.c b/src/lib/libcrypto/sha/sha256.c
index ab00c17878..5d002ca62c 100644
--- a/src/lib/libcrypto/sha/sha256.c
+++ b/src/lib/libcrypto/sha/sha256.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sha256.c,v 1.32 2024/06/01 07:36:16 tb Exp $ */
+/* $OpenBSD: sha256.c,v 1.33 2025/02/14 12:01:58 jsing Exp $ */
 /* ====================================================================
  * Copyright (c) 1998-2011 The OpenSSL Project.  All rights reserved.
  *
@@ -68,11 +68,10 @@
 /* Ensure that SHA_LONG and uint32_t are equivalent. */
 CTASSERT(sizeof(SHA_LONG) == sizeof(uint32_t));
 
-#ifdef SHA256_ASM
 void sha256_block_data_order(SHA256_CTX *ctx, const void *_in, size_t num);
-#endif
+void sha256_block_generic(SHA256_CTX *ctx, const void *_in, size_t num);
 
-#ifndef SHA256_ASM
+#ifndef HAVE_SHA256_BLOCK_GENERIC
 static const SHA_LONG K256[64] = {
         0x428a2f98UL, 0x71374491UL, 0xb5c0fbcfUL, 0xe9b5dba5UL,
         0x3956c25bUL, 0x59f111f1UL, 0x923f82a4UL, 0xab1c5ed5UL,
@@ -155,8 +154,8 @@ sha256_round(SHA_LONG *a, SHA_LONG *b, SHA_LONG *c, SHA_LONG *d, SHA_LONG *e,
         *a = T1 + T2;
 }
 
-static void
-sha256_block_data_order(SHA256_CTX *ctx, const void *_in, size_t num)
+void
+sha256_block_generic(SHA256_CTX *ctx, const void *_in, size_t num)
 {
         const uint8_t *in = _in;
         const SHA_LONG *in32;
@@ -277,7 +276,15 @@ sha256_block_data_order(SHA256_CTX *ctx, const void *_in, size_t num)
                 ctx->h[7] += h;
         }
 }
-#endif /* SHA256_ASM */
+#endif
+
+#ifndef HAVE_SHA256_BLOCK_DATA_ORDER
+void
+sha256_block_data_order(SHA256_CTX *ctx, const void *_in, size_t num)
+{
+        sha256_block_generic(ctx, _in, num);
+}
+#endif
 
 int
 SHA224_Init(SHA256_CTX *c)