55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/* shacal1_enc.c */
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/*
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This file is part of the AVR-Crypto-Lib.
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Copyright (C) 2008 Daniel Otte (daniel.otte@rub.de)
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/**
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* \file shacal1_enc.c
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* \author Daniel Otte
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* \date 2008-05-06
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* \par License:
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* GPL
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* \brief SHACAL1 encryption only implementation.
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*
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*/
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#include <stdint.h>
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#include <string.h>
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#include "sha1.h"
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#include "shacal1_enc.h"
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void shacal1_enc(void* buffer, void* key, uint16_t keysize_b){
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sha1_ctx_t ctx, t_ctx;
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uint8_t i;
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memcpy(t_ctx.h, buffer, SHA1_HASH_BITS/8);
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uint8_t keybuffer[SHA1_BLOCK_BITS/8];
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memset(keybuffer, 0, SHA1_BLOCK_BITS/8);
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if(keysize_b>SHA1_BLOCK_BITS)
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keysize_b=SHA1_BLOCK_BITS;
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memcpy(keybuffer, key, (keysize_b+7)/8);
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memcpy(t_ctx.h, buffer, SHA1_HASH_BITS/8);
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sha1_ctx2hash((sha1_hash_t*)(&(ctx.h[0])), &t_ctx);
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memcpy(t_ctx.h, ctx.h, SHA1_HASH_BITS/8);
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sha1_nextBlock(&ctx, keybuffer);
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for(i=0; i<5; ++i)
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ctx.h[i] -= t_ctx.h[i];
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sha1_ctx2hash(buffer, &ctx);
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}
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