94 lines
2.7 KiB
C
94 lines
2.7 KiB
C
/* skein256.c */
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/*
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This file is part of the ARM-Crypto-Lib.
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Copyright (C) 2006-2010 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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/*
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* \author Daniel Otte
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* \email daniel.otte@rub.de
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* \date 2009-03-12
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* \license GPLv3 or later
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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 "ubi.h"
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#include "skein.h"
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void skein256_init(skein256_ctx_t* ctx, uint16_t outsize_b){
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skein_config_t conf;
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uint8_t null[UBI256_BLOCKSIZE_B];
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memset(null, 0, UBI256_BLOCKSIZE_B);
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memset(&conf, 0, sizeof(skein_config_t));
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conf.schema[0] = 'S';
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conf.schema[1] = 'H';
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conf.schema[2] = 'A';
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conf.schema[3] = '3';
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conf.version = 1;
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conf.out_length = outsize_b;
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ctx->outsize_b = outsize_b;
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ubi256_init(&(ctx->ubictx), null, UBI_TYPE_CFG);
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ubi256_lastBlock(&(ctx->ubictx), &conf, 256);
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ubi256_init(&(ctx->ubictx), ctx->ubictx.g, UBI_TYPE_MSG);
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}
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void skein256_nextBlock(skein256_ctx_t* ctx, const void* block){
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ubi256_nextBlock(&(ctx->ubictx), block);
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}
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void skein256_lastBlock(skein256_ctx_t* ctx, const void* block, uint16_t length_b){
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ubi256_lastBlock(&(ctx->ubictx), block, length_b);
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}
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void skein256_ctx2hash(void* dest, skein256_ctx_t* ctx){
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ubi256_ctx_t uctx;
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uint16_t outsize_b;
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uint64_t counter=0;
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uint8_t outbuffer[UBI256_BLOCKSIZE_B];
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ubi256_init(&(ctx->ubictx), ctx->ubictx.g, UBI_TYPE_OUT);
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outsize_b = ctx->outsize_b;
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while(1){
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memcpy(&uctx, &(ctx->ubictx), sizeof(ubi256_ctx_t));
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ubi256_lastBlock(&uctx, &counter, 64);
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ubi256_ctx2hash(outbuffer, &uctx);
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if(outsize_b<=UBI256_BLOCKSIZE){
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memcpy(dest, outbuffer, (outsize_b+7)/8);
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break;
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}else{
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memcpy(dest, outbuffer, UBI256_BLOCKSIZE_B);
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dest = (uint8_t*)dest + UBI256_BLOCKSIZE_B;
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outsize_b -= UBI256_BLOCKSIZE;
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counter++;
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}
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}
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}
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void skein256(void* dest, uint16_t outlength_b,const void* msg, uint32_t length_b){
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skein256_ctx_t ctx;
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skein256_init(&ctx, outlength_b);
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while(length_b>SKEIN256_BLOCKSIZE){
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skein256_nextBlock(&ctx, msg);
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msg = (uint8_t*)msg + SKEIN256_BLOCKSIZE_B;
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length_b -= SKEIN256_BLOCKSIZE;
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}
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skein256_lastBlock(&ctx, msg, length_b);
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skein256_ctx2hash(dest, &ctx);
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}
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