77 lines
2.3 KiB
C
77 lines
2.3 KiB
C
/* ubi512.c */
|
|
/*
|
|
This file is part of the ARM-Crypto-Lib.
|
|
Copyright (C) 2006-2010 Daniel Otte (daniel.otte@rub.de)
|
|
|
|
This program is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
/*
|
|
* \author Daniel Otte
|
|
* \email daniel.otte@rub.de
|
|
* \date 2009-03-12
|
|
* \license GPLv3 or later
|
|
*
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
#include <string.h>
|
|
#include "threefish.h"
|
|
#include "memxor.h"
|
|
#include "ubi.h"
|
|
|
|
void ubi512_init(ubi512_ctx_t* ctx, const void* g, uint8_t type){
|
|
memset(ctx->tweak.v8, 0, 15);
|
|
ctx->tweak.v8[15] = 0x40+type;
|
|
memcpy(ctx->g, g, UBI512_BLOCKSIZE_B);
|
|
}
|
|
|
|
void ubi512_nextBlock(ubi512_ctx_t* ctx, const void* block){
|
|
threefish512_ctx_t tfctx;
|
|
ctx->tweak.v64[0] += UBI512_BLOCKSIZE_B;
|
|
threefish512_init(ctx->g, ctx->tweak.v8, &tfctx);
|
|
memcpy(ctx->g, block, UBI512_BLOCKSIZE_B);
|
|
threefish512_enc(ctx->g, &tfctx);
|
|
memxor(ctx->g, block, UBI512_BLOCKSIZE_B);
|
|
ctx->tweak.v8[15] &= (uint8_t)~0x40;
|
|
}
|
|
|
|
|
|
void ubi512_lastBlock(ubi512_ctx_t* ctx, const void* block, uint16_t length_b){
|
|
threefish512_ctx_t tfctx;
|
|
while(length_b>UBI512_BLOCKSIZE){
|
|
ubi512_nextBlock(ctx, block);
|
|
block = (uint8_t*)block + UBI512_BLOCKSIZE_B;
|
|
length_b -= UBI512_BLOCKSIZE;
|
|
}
|
|
ctx->tweak.v8[15] |= 0x80;
|
|
ctx->tweak.v64[0] += (length_b+7)/8;
|
|
if(length_b & 0x07)
|
|
ctx->tweak.v8[14] |= 0x80;
|
|
threefish512_init(ctx->g, ctx->tweak.v8, &tfctx);
|
|
memset(ctx->g, 0, UBI512_BLOCKSIZE_B);
|
|
memcpy(ctx->g, block, (length_b+7)/8);
|
|
if(length_b & 0x07)
|
|
ctx->g[(length_b+7)/8-1] |= 0x80>>(length_b&7);
|
|
threefish512_enc(ctx->g, &tfctx);
|
|
memxor(ctx->g, block, (length_b+7)/8);
|
|
if(length_b & 0x07){
|
|
ctx->g[((length_b+7)/8)-1] ^= 0x80>>(length_b&7);
|
|
}
|
|
}
|
|
|
|
void ubi512_ctx2hash(void* dest, const ubi512_ctx_t* ctx){
|
|
memcpy(dest, ctx->g, UBI512_BLOCKSIZE_B);
|
|
}
|
|
|