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[avr-crypto-lib.git] / shacal1 / shacal1_enc.c

diff --git a/shacal1/shacal1_enc.c b/shacal1/shacal1_enc.c
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+++ b/shacal1/shacal1_enc.c
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+/* shacal1_enc.c */
+/*
+    This file is part of the AVR-Crypto-Lib.
+    Copyright (C) 2008  Daniel Otte (daniel.otte@rub.de)
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program 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 a copy of the GNU General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+/**
+ * \file       shacal1_enc.c
+ * \author     Daniel Otte
+ * \date       2008-05-06
+ * \par License:
+ * GPL
+ * \brief SHACAL1 encryption only implementation.
+ * 
+ */
+
+#include <stdint.h>
+#include <string.h>
+#include "sha1.h"
+#include "shacal1_enc.h"
+
+void shacal1_enc(void* buffer, void* key, uint16_t keysize_b){
+       sha1_ctx_t ctx, t_ctx;
+       uint8_t i;
+       memcpy(t_ctx.h, buffer, SHA1_HASH_BITS/8);
+       
+       uint8_t keybuffer[SHA1_BLOCK_BITS/8];
+       memset(keybuffer, 0, SHA1_BLOCK_BITS/8);
+       if(keysize_b>SHA1_BLOCK_BITS)
+               keysize_b=SHA1_BLOCK_BITS;
+       memcpy(keybuffer, key, (keysize_b+7)/8);
+       
+       memcpy(t_ctx.h, buffer, SHA1_HASH_BITS/8);
+       sha1_ctx2hash((sha1_hash_t*)(&(ctx.h[0])), &t_ctx);
+       memcpy(t_ctx.h, ctx.h, SHA1_HASH_BITS/8);
+       sha1_nextBlock(&ctx, keybuffer);
+       for(i=0; i<5; ++i)
+               ctx.h[i] -= t_ctx.h[i];
+       sha1_ctx2hash(buffer, &ctx);
+}
+
+