37 lines
821 B
C
37 lines
821 B
C
/**
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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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