Provide a SHA-1 assembly implementation for amd64 using SHA-NI.

This provides a SHA-1 assembly implementation for amd64, which uses
the Intel SHA Extensions (aka SHA New Instructions or SHA-NI). This
provides a 2-2.5x performance gain on some Intel CPUs and many AMD CPUs.

ok tb@

1 files changed, 7 insertions, 1 deletions

diff --git a/src/lib/libcrypto/sha/sha1_amd64.c b/src/lib/libcrypto/sha/sha1_amd64.c
index b3d4ab1263..2976cc7e6e 100644
--- a/src/lib/libcrypto/sha/sha1_amd64.c
+++ b/src/lib/libcrypto/sha/sha1_amd64.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: sha1_amd64.c,v 1.1 2024/12/04 13:13:33 jsing Exp $ */
+/* $OpenBSD: sha1_amd64.c,v 1.2 2024/12/06 11:57:18 jsing Exp $ */
 /*
  * Copyright (c) 2024 Joel Sing <jsing@openbsd.org>
  *
@@ -20,9 +20,15 @@
 #include "crypto_arch.h"
 
 void sha1_block_generic(SHA_CTX *ctx, const void *in, size_t num);
+void sha1_block_shani(SHA_CTX *ctx, const void *in, size_t num);
 
 void
 sha1_block_data_order(SHA_CTX *ctx, const void *in, size_t num)
 {
+        if ((crypto_cpu_caps_amd64 & CRYPTO_CPU_CAPS_AMD64_SHA) != 0) {
+                sha1_block_shani(ctx, in, num);
+                return;
+        }
+
         sha1_block_generic(ctx, in, num);
 }