122 lines
2.9 KiB
C
122 lines
2.9 KiB
C
/* shabal.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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* \file shabal.c
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* \author Daniel Otte
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* \email daniel.otte@rub.de
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* \date 2009-04-17
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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 "shabal.h"
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#include <string.h>
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#define SHABAL_O1 13
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#define SHABAL_O2 9
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#define SHABAL_O3 6
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static inline
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uint32_t shabal_u(uint32_t a){
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return (a<<1)+a; /* a*3 */
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}
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static inline
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uint32_t shabal_v(uint32_t a){
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return (a<<2)+a; /* a*5 */
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}
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#define ROTL32(a,n) (((a)<<(n))|((a)>>(32-(n))))
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static
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void shabal_p(shabal_ctx_t* ctx, const void* m){
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uint8_t i,j;
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for(i=0;i<16;++i){
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ctx->b[i] = ROTL32(ctx->b[i],17);
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}
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for(j=0;j<SHABAL_P;j++){
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for(i=0;i<16;++i){
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ctx->a[(i+j*16)%SHABAL_R] =
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shabal_u(ctx->a[(i+j*16)%SHABAL_R]
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^ shabal_v(ROTL32(ctx->a[(i+j*16+SHABAL_R-1)%SHABAL_R],15))
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^ ctx->c[(8-i+16)%16])
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^ ctx->b[(i+SHABAL_O1)%16]
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^ ((ctx->b[(i+SHABAL_O2)%16]) & ~(ctx->b[(i+SHABAL_O3)%16]))
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^ ((uint32_t*)m)[i];
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ctx->b[i] = ROTL32(ctx->b[i], 1) ^ ~(ctx->a[(i+j*16)%SHABAL_R]);
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}
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}
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for(j=0;j<36;++j){
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ctx->a[j%SHABAL_R] += ctx->c[(j+3)%16];
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}
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}
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void shabal_nextBlock(shabal_ctx_t* ctx, const void* block){
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uint8_t i;
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uint32_t* t;
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for(i=0;i<16;++i){
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ctx->b[i] += ((uint32_t*)block)[i];
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}
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ctx->a[0] ^= ctx->w.w32[0];
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ctx->a[1] ^= ctx->w.w32[1];
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shabal_p(ctx, block);
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for(i=0;i<16;++i){
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ctx->c[i] -= ((uint32_t*)block)[i];
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}
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ctx->w.w64++;
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t = ctx->c;
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ctx->c = ctx->b;
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ctx->b = t;
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}
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void shabal_lastBlock(shabal_ctx_t* ctx, const void* block, uint16_t length_b){
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uint8_t i,j;
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uint32_t* t;
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uint8_t buffer[64];
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while(length_b>=SHABAL_BLOCKSIZE){
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shabal_nextBlock(ctx, block);
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block = (uint8_t*)block + SHABAL_BLOCKSIZE_B;
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length_b -= SHABAL_BLOCKSIZE;
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}
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memset(buffer, 0, 64);
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memcpy(buffer, block, (length_b+7)/8);
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buffer[length_b/8] |= 0x80>>(length_b%8);
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for(i=0;i<16;++i){
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ctx->b[i] += ((uint32_t*)buffer)[i];
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}
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for(j=0; j<4;++j){
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ctx->a[0] ^= ctx->w.w32[0];
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ctx->a[1] ^= ctx->w.w32[1];
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shabal_p(ctx, buffer);
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t = ctx->c;
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ctx->c = ctx->b;
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ctx->b = t;
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}
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}
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void shabal_ctx2hash(void* dest, const shabal_ctx_t* ctx, uint16_t outlength_b){
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memcpy(dest, &(ctx->c[16-outlength_b/32]), outlength_b/8);
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}
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