Add support for truncated SHA512 variants.

This adds support for SHA512/224 and SHA512/256, as specified in FIPS
FIPS 180-4. These are truncated versions of the SHA512 hash.

ok tb@

1 files changed, 36 insertions, 0 deletions

diff --git a/src/lib/libcrypto/sha/sha_internal.h b/src/lib/libcrypto/sha/sha_internal.h
new file mode 100644
index 0000000000..c479993185
--- /dev/null
+++ b/src/lib/libcrypto/sha/sha_internal.h
@@ -0,0 +1,36 @@
+/*      $OpenBSD: sha_internal.h,v 1.1 2023/04/14 10:45:15 jsing Exp $ */
+/*
+ * Copyright (c) 2023 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>
+
+#ifndef HEADER_SHA_INTERNAL_H
+#define HEADER_SHA_INTERNAL_H
+
+#define SHA512_224_DIGEST_LENGTH        28
+#define SHA512_256_DIGEST_LENGTH        32
+
+int SHA512_224_Init(SHA512_CTX *c);
+int SHA512_224_Update(SHA512_CTX *c, const void *data, size_t len)
+        __attribute__ ((__bounded__(__buffer__,2,3)));
+int SHA512_224_Final(unsigned char *md, SHA512_CTX *c);
+
+int SHA512_256_Init(SHA512_CTX *c);
+int SHA512_256_Update(SHA512_CTX *c, const void *data, size_t len)
+        __attribute__ ((__bounded__(__buffer__,2,3)));
+int SHA512_256_Final(unsigned char *md, SHA512_CTX *c);
+
+#endif