77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/* ubi1024.c */
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/*
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This file is part of the AVR-Crypto-Lib.
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Copyright (C) 2009 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 "threefish.h"
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#include "memxor.h"
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#include "ubi.h"
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void ubi1024_init(ubi1024_ctx_t* ctx, const void* g, uint8_t type){
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memset(ctx->tweak, 0, 15);
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ctx->tweak[15] = 0x40+type;
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memcpy(ctx->g, g, UBI1024_BLOCKSIZE_B);
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}
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void ubi1024_nextBlock(ubi1024_ctx_t* ctx, const void* block){
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threefish1024_ctx_t tfctx;
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((uint64_t*)(ctx->tweak))[0] += UBI1024_BLOCKSIZE_B;
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threefish1024_init(ctx->g, ctx->tweak, &tfctx);
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memcpy(ctx->g, block, UBI1024_BLOCKSIZE_B);
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threefish1024_enc(ctx->g, &tfctx);
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memxor(ctx->g, block, UBI1024_BLOCKSIZE_B);
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ctx->tweak[15] &= (uint8_t)~0x40;
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}
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void ubi1024_lastBlock(ubi1024_ctx_t* ctx, const void* block, uint16_t length_b){
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threefish1024_ctx_t tfctx;
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while(length_b>UBI1024_BLOCKSIZE){
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ubi1024_nextBlock(ctx, block);
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block = (uint8_t*)block + UBI1024_BLOCKSIZE_B;
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length_b -= UBI1024_BLOCKSIZE;
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}
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ctx->tweak[15] |= 0x80;
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((uint64_t*)(ctx->tweak))[0] += (length_b+7)/8;
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if(length_b & 0x07)
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ctx->tweak[14] |= 0x80;
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threefish1024_init(ctx->g, ctx->tweak, &tfctx);
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memset(ctx->g, 0, UBI1024_BLOCKSIZE_B);
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memcpy(ctx->g, block, (length_b+7)/8);
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if(length_b & 0x07)
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ctx->g[(length_b+7)/8-1] |= 0x80>>(length_b&7);
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threefish1024_enc(ctx->g, &tfctx);
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memxor(ctx->g, block, (length_b+7)/8);
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if(length_b & 0x07){
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ctx->g[((length_b+7)/8)-1] ^= 0x80>>(length_b&7);
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}
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}
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void ubi1024_ctx2hash(void* dest, const ubi1024_ctx_t* ctx){
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memcpy(dest, ctx->g, UBI1024_BLOCKSIZE_B);
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}
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