55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/* keecak.c */
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/*
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This file is part of the AVR-Crypto-Lib.
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Copyright (C) 2010 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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#include <stdint.h>
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#include <stdlib.h>
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#include <string.h>
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#include "memxor.h"
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#include "keccak.h"
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void keccak_f1600(uint8_t a[200]);
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void keccak_lastBlock(keccak_ctx_t* ctx, const void* block, uint16_t length_b){
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uint8_t length_B;
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while(length_b >= ctx->r){
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keccak_nextBlock(ctx, block);
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block = (uint8_t*)block + ctx->bs;
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length_b -= ctx->r;
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}
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length_B = length_b / 8;
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memxor(ctx->a, block, length_B);
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/* append 1 */
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if(length_b & 7){
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/* we have some single bits */
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uint8_t t;
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t = ((uint8_t*)block)[length_B] >> (8 - (length_b & 7));
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t |= 0x01 << (length_b & 7);
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ctx->a[length_B] ^= t;
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}else{
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ctx->a[length_B] ^= 0x01;
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}
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if(length_b == ctx->r - 1){
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keccak_f1600(ctx->a);
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}
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ctx->a[ctx->bs - 1] ^= 0x80;
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keccak_f1600(ctx->a);
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}
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