Implement GOST R 34.11-2012 (Streebog) hash function

Also add nettle_streebog256 and nettle_streebog512 to nettle meta interface.

Signed-off-by: Dmitry Baryshkov <dbaryshkov@gmail.com>

1 files changed, 99 insertions, 0 deletions

diff --git a/streebog.h b/streebog.h
new file mode 100644
index 00000000..69ac0d5c
--- /dev/null
+++ b/streebog.h
@@ -0,0 +1,99 @@
+/* streebog.h
+
+   The Streebog family of hash functions.
+
+   Copyright (C) 2020 Dmitry Baryshkov
+
+   This file is part of GNU Nettle.
+
+   GNU Nettle is free software: you can redistribute it and/or
+   modify it under the terms of either:
+
+     * the GNU Lesser General Public License as published by the Free
+       Software Foundation; either version 3 of the License, or (at your
+       option) any later version.
+
+   or
+
+     * the GNU General Public License as published by the Free
+       Software Foundation; either version 2 of the License, or (at your
+       option) any later version.
+
+   or both in parallel, as here.
+
+   GNU Nettle is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+   General Public License for more details.
+
+   You should have received copies of the GNU General Public License and
+   the GNU Lesser General Public License along with this program.  If
+   not, see http://www.gnu.org/licenses/.
+*/
+ 
+#ifndef NETTLE_STREEBOG_H_INCLUDED
+#define NETTLE_STREEBOG_H_INCLUDED
+
+#include "nettle-types.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Name mangling */
+#define streebog256_init nettle_streebog256_init
+#define streebog256_digest nettle_streebog256_digest
+#define streebog512_init nettle_streebog512_init
+#define streebog512_update nettle_streebog512_update
+#define streebog512_digest nettle_streebog512_digest
+
+/* STREEBOG512 */
+
+#define STREEBOG512_DIGEST_SIZE 64
+#define STREEBOG512_BLOCK_SIZE 64
+
+/* Digest is kept internally as 8 64-bit words. */
+#define _STREEBOG512_DIGEST_LENGTH 8
+
+struct streebog512_ctx
+{
+  uint64_t state[_STREEBOG512_DIGEST_LENGTH];    /* State variables */
+  uint64_t count[_STREEBOG512_DIGEST_LENGTH];
+  uint64_t sigma[_STREEBOG512_DIGEST_LENGTH];
+  unsigned int index;                       /* index into buffer */
+  uint8_t block[STREEBOG512_BLOCK_SIZE];          /* STREEBOG512 data buffer */
+};
+
+void
+streebog512_init(struct streebog512_ctx *ctx);
+
+void
+streebog512_update(struct streebog512_ctx *ctx,
+	      size_t length,
+	      const uint8_t *data);
+
+void
+streebog512_digest(struct streebog512_ctx *ctx,
+	      size_t length,
+	      uint8_t *digest);
+
+
+#define STREEBOG256_DIGEST_SIZE 32
+#define STREEBOG256_BLOCK_SIZE STREEBOG512_BLOCK_SIZE
+#define streebog256_ctx streebog512_ctx
+
+void
+streebog256_init(struct streebog256_ctx *ctx);
+
+#define streebog256_update nettle_streebog512_update
+
+void
+streebog256_digest(struct streebog256_ctx *ctx,
+		  size_t length,
+		  uint8_t *digest);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NETTLE_STREEBOG_H_INCLUDED */