Provide a replacement assembly implementation for SHA-1 on amd64.

As already done for SHA-256 and SHA-512, replace the perlasm generated
SHA-1 assembly implementation with one that is actually readable. Call the
assembly implementation from a C wrapper that can, in the future, dispatch
to alternate implementations. On a modern CPU the performance is around
5% faster than the base implementation generated by sha1-x86_64.pl, however
it is around 15% slower than the excessively complex SSSE2/AVX version that
is also generated by the same script (a SHA-NI version will greatly
outperform this and is much cleaner/simpler).

ok tb@

1 files changed, 28 insertions, 0 deletions

diff --git a/src/lib/libcrypto/sha/sha1_amd64.c b/src/lib/libcrypto/sha/sha1_amd64.c
new file mode 100644
index 0000000000..b3d4ab1263
--- /dev/null
+++ b/src/lib/libcrypto/sha/sha1_amd64.c
@@ -0,0 +1,28 @@
+/* $OpenBSD: sha1_amd64.c,v 1.1 2024/12/04 13:13:33 jsing Exp $ */
+/*
+ * Copyright (c) 2024 Joel Sing <jsing@openbsd.org>
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <openssl/sha.h>
+
+#include "crypto_arch.h"
+
+void sha1_block_generic(SHA_CTX *ctx, const void *in, size_t num);
+
+void
+sha1_block_data_order(SHA_CTX *ctx, const void *in, size_t num)
+{
+        sha1_block_generic(ctx, in, num);
+}