From 1c8cc9e9104361ded1c9f9bffdec59e37a0ee5ec Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Niels=20M=C3=B6ller?= <nisse@lysator.liu.se>
Date: Mon, 12 Nov 2012 22:06:11 +0100
Subject: Implemented sha3.

---
 sha3-256.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 60 insertions(+)
 create mode 100644 sha3-256.c

(limited to 'sha3-256.c')

diff --git a/sha3-256.c b/sha3-256.c
new file mode 100644
index 00000000..e5294818
--- /dev/null
+++ b/sha3-256.c
@@ -0,0 +1,60 @@
+/* sha3-256.c
+ *
+ * The sha3 hash function, 256 bit output.
+ */
+
+/* nettle, low-level cryptographics library
+ *
+ * Copyright (C) 2012 Niels Möller
+ *  
+ * The nettle library is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation; either version 2.1 of the License, or (at your
+ * option) any later version.
+ * 
+ * The nettle library 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 Lesser General Public
+ * License for more details.
+ * 
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with the nettle library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
+ * MA 02111-1301, USA.
+ */
+
+#if HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include <stddef.h>
+#include <string.h>
+
+#include "sha3.h"
+
+#include "nettle-write.h"
+
+void
+sha3_256_init (struct sha3_256_ctx *ctx)
+{
+  memset (&ctx->state, 0, offsetof (struct sha3_256_ctx, block));
+}
+
+void
+sha3_256_update (struct sha3_256_ctx *ctx,
+		 unsigned length,
+		 const uint8_t *data)
+{
+  ctx->index = _sha3_update (&ctx->state, SHA3_256_DATA_SIZE, ctx->block,
+			     ctx->index, length, data);
+}
+
+void
+sha3_256_digest(struct sha3_256_ctx *ctx,
+		unsigned length,
+		uint8_t *digest)
+{
+  _sha3_pad (&ctx->state, SHA3_256_DATA_SIZE, ctx->block, ctx->index);
+  _nettle_write_le64 (length, digest, ctx->state.a);
+  sha3_256_init (ctx);
+}
-- 
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