351 lines
11 KiB
C
351 lines
11 KiB
C
/* bmw_small.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 bmw_small.c
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* \author Daniel Otte
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* \email daniel.otte@rub.de
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* \date 2009-04-27
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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 "bmw_small.h"
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#include "memxor.h"
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#define SHL32(a,n) ((a)<<(n))
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#define SHR32(a,n) ((a)>>(n))
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#define ROTL32(a,n) (((a)<<(n))|((a)>>(32-(n))))
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#define ROTR32(a,n) (((a)>>(n))|((a)<<(32-(n))))
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#define DEBUG 0
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#if DEBUG
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#include "cli.h"
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void ctx_dump(const bmw_small_ctx_t* ctx){
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uint8_t i;
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cli_putstr("\r\n==== ctx dump ====");
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for(i=0; i<16;++i){
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cli_putstr("\r\n h[");
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cli_hexdump(&i, 1);
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cli_putstr("] = ");
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cli_hexdump_rev(&(ctx->h[i]), 4);
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}
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cli_putstr("\r\n counter = ");
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cli_hexdump(&(ctx->counter), 4);
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}
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void dump_x(const uint32_t* q, uint8_t elements, char x){
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uint8_t i;
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cli_putstr("\r\n==== ");
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cli_putc(x);
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cli_putstr(" dump ====");
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for(i=0; i<elements;++i){
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cli_putstr("\r\n ");
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cli_putc(x);
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cli_putstr("[");
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cli_hexdump(&i, 1);
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cli_putstr("] = ");
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cli_hexdump_rev(&(q[i]), 4);
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}
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}
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#else
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#define ctx_dump(x)
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#define dump_x(a,b,c)
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#endif
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#define S32_0(x) ( (SHR32((x), 1)) ^ \
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(SHL32((x), 3)) ^ \
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(ROTL32((x), 4)) ^ \
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(ROTR32((x), 13)) )
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#define S32_1(x) ( (SHR32((x), 1)) ^ \
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(SHL32((x), 2)) ^ \
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(ROTL32((x), 8)) ^ \
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(ROTR32((x), 9)) )
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#define S32_2(x) ( (SHR32((x), 2)) ^ \
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(SHL32((x), 1)) ^ \
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(ROTL32((x), 12)) ^ \
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(ROTR32((x), 7)) )
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#define S32_3(x) ( (SHR32((x), 2)) ^ \
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(SHL32((x), 2)) ^ \
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(ROTL32((x), 15)) ^ \
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(ROTR32((x), 3)) )
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#define S32_4(x) ( (SHR32((x), 1)) ^ (x))
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#define S32_5(x) ( (SHR32((x), 2)) ^ (x))
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#define R32_1(x) (ROTL32((x), 3))
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#define R32_2(x) (ROTL32((x), 7))
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#define R32_3(x) (ROTL32((x), 13))
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#define R32_4(x) (ROTL32((x), 16))
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#define R32_5(x) (ROTR32((x), 13))
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#define R32_6(x) (ROTR32((x), 9))
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#define R32_7(x) (ROTR32((x), 5))
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/*
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#define K 0x05555555L
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static
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uint32_t k_lut[] PROGMEM = {
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16L*K, 17L*K, 18L*K, 19L*K, 20L*K, 21L*K, 22L*K, 23L*K,
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24L*K, 25L*K, 26L*K, 27L*K, 28L*K, 29L*K, 30L*K, 31L*K
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};
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*/
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/* same as above but precomputed to avoid compiler warnings */
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static
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uint32_t k_lut[] = {
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0x55555550L, 0x5aaaaaa5L, 0x5ffffffaL,
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0x6555554fL, 0x6aaaaaa4L, 0x6ffffff9L,
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0x7555554eL, 0x7aaaaaa3L, 0x7ffffff8L,
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0x8555554dL, 0x8aaaaaa2L, 0x8ffffff7L,
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0x9555554cL, 0x9aaaaaa1L, 0x9ffffff6L,
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0xa555554bL };
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static
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uint32_t bmw_small_expand1(uint8_t j, const uint32_t* q, const void* m, const void* h){
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uint32_t r;
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/* r = 0x05555555*(j+16); */
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r = ( ROTL32(((uint32_t*)m)[j&0xf], ((j+0)&0xf)+1 )
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+ ROTL32(((uint32_t*)m)[(j+3)&0xf], ((j+3)&0xf)+1 )
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- ROTL32(((uint32_t*)m)[(j+10)&0xf], ((j+10)&0xf)+1 )
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+ k_lut[j]
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) ^ ((uint32_t*)h)[(j+7)&0xf];
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r += S32_1(q[j+ 0]) + S32_2(q[j+ 1]) + S32_3(q[j+ 2]) + S32_0(q[j+ 3]) +
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S32_1(q[j+ 4]) + S32_2(q[j+ 5]) + S32_3(q[j+ 6]) + S32_0(q[j+ 7]) +
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S32_1(q[j+ 8]) + S32_2(q[j+ 9]) + S32_3(q[j+10]) + S32_0(q[j+11]) +
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S32_1(q[j+12]) + S32_2(q[j+13]) + S32_3(q[j+14]) + S32_0(q[j+15]);
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return r;
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}
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static
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uint32_t bmw_small_expand2(uint8_t j, const uint32_t* q, const void* m, const void* h){
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uint32_t r;
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r = ( ROTL32(((uint32_t*)m)[j&0xf], ((j+0)&0xf)+1 )
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+ ROTL32(((uint32_t*)m)[(j+3)&0xf], ((j+3)&0xf)+1 )
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- ROTL32(((uint32_t*)m)[(j+10)&0xf], ((j+10)&0xf)+1 )
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+ k_lut[j]
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) ^ ((uint32_t*)h)[(j+7)&0xf];
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r += (q[j+ 0]) + R32_1(q[j+ 1]) + (q[j+ 2]) + R32_2(q[j+ 3]) +
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(q[j+ 4]) + R32_3(q[j+ 5]) + (q[j+ 6]) + R32_4(q[j+ 7]) +
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(q[j+ 8]) + R32_5(q[j+ 9]) + (q[j+10]) + R32_6(q[j+11]) +
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(q[j+12]) + R32_7(q[j+13]) + S32_4(q[j+14]) + S32_5(q[j+15]);
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return r;
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}
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static
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void bmw_small_f0(uint32_t* q, uint32_t* h, const void* m){
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uint8_t i;
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i=15;
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do{
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((uint32_t*)h)[i] ^= ((uint32_t*)m)[i];
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}while(i--);
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dump_x(h, 16, 'T');
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q[ 0] = (h[ 5] - h[ 7] + h[10] + h[13] + h[14]);
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q[ 3] = (h[ 0] - h[ 1] + h[ 8] - h[10] + h[13]);
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q[ 6] = (h[ 4] - h[ 0] - h[ 3] - h[11] + h[13]);
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q[ 9] = (h[ 0] - h[ 3] + h[ 6] - h[ 7] + h[14]);
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q[12] = (h[ 1] + h[ 3] - h[ 6] - h[ 9] + h[10]);
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q[15] = (h[12] - h[ 4] - h[ 6] - h[ 9] + h[13]);
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q[ 2] = (h[ 0] + h[ 7] + h[ 9] - h[12] + h[15]);
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q[ 5] = (h[ 3] - h[ 2] + h[10] - h[12] + h[15]);
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q[ 8] = (h[ 2] - h[ 5] - h[ 6] + h[13] - h[15]);
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q[11] = (h[ 8] - h[ 0] - h[ 2] - h[ 5] + h[ 9]);
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q[14] = (h[ 3] - h[ 5] + h[ 8] - h[11] - h[12]);
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q[ 1] = (h[ 6] - h[ 8] + h[11] + h[14] - h[15]);
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q[ 4] = (h[ 1] + h[ 2] + h[ 9] - h[11] - h[14]);
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q[ 7] = (h[ 1] - h[ 4] - h[ 5] - h[12] - h[14]);
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q[10] = (h[ 8] - h[ 1] - h[ 4] - h[ 7] + h[15]);
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q[13] = (h[ 2] + h[ 4] + h[ 7] + h[10] + h[11]);
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dump_x(q, 16, 'W');
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q[ 0] = S32_0(q[ 0]); q[ 1] = S32_1(q[ 1]); q[ 2] = S32_2(q[ 2]); q[ 3] = S32_3(q[ 3]); q[ 4] = S32_4(q[ 4]);
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q[ 5] = S32_0(q[ 5]); q[ 6] = S32_1(q[ 6]); q[ 7] = S32_2(q[ 7]); q[ 8] = S32_3(q[ 8]); q[ 9] = S32_4(q[ 9]);
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q[10] = S32_0(q[10]); q[11] = S32_1(q[11]); q[12] = S32_2(q[12]); q[13] = S32_3(q[13]); q[14] = S32_4(q[14]);
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q[15] = S32_0(q[15]);
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i=15;
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do{
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q[(i+15)&15] += ((uint32_t*)h)[i] ^= ((uint32_t*)m)[i];
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}while(i--);
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}
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static
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void bmw_small_f1(uint32_t* q, const void* m, const void* h){
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uint8_t i;
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q[16] = bmw_small_expand1(0, q, m, h);
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q[17] = bmw_small_expand1(1, q, m, h);
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for(i=2; i<16; ++i){
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q[16+i] = bmw_small_expand2(i, q, m, h);
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}
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}
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static
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void bmw_small_f2(uint32_t* h, uint32_t* q, const uint32_t* m){
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uint32_t xl, xh;
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xl = q[16] ^ q[17] ^ q[18] ^ q[19] ^ q[20] ^ q[21] ^ q[22] ^ q[23];
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xh = xl ^ q[24] ^ q[25] ^ q[26] ^ q[27] ^ q[28] ^ q[29] ^ q[30] ^ q[31];
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#if DEBUG
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cli_putstr("\r\n XL = ");
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cli_hexdump_rev(&xl, 4);
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cli_putstr("\r\n XH = ");
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cli_hexdump_rev(&xh, 4);
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#endif
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h[0] = (SHL32(xh, 5) ^ SHR32(q[16], 5) ^ m[ 0]) + (xl ^ q[24] ^ q[ 0]);
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h[1] = (SHR32(xh, 7) ^ SHL32(q[17], 8) ^ m[ 1]) + (xl ^ q[25] ^ q[ 1]);
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h[2] = (SHR32(xh, 5) ^ SHL32(q[18], 5) ^ m[ 2]) + (xl ^ q[26] ^ q[ 2]);
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h[3] = (SHR32(xh, 1) ^ SHL32(q[19], 5) ^ m[ 3]) + (xl ^ q[27] ^ q[ 3]);
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h[4] = (SHR32(xh, 3) ^ q[20] ^ m[ 4]) + (xl ^ q[28] ^ q[ 4]);
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h[5] = (SHL32(xh, 6) ^ SHR32(q[21], 6) ^ m[ 5]) + (xl ^ q[29] ^ q[ 5]);
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h[6] = (SHR32(xh, 4) ^ SHL32(q[22], 6) ^ m[ 6]) + (xl ^ q[30] ^ q[ 6]);
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h[7] = (SHR32(xh,11) ^ SHL32(q[23], 2) ^ m[ 7]) + (xl ^ q[31] ^ q[ 7]);
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h[ 8] = ROTL32(h[4], 9) + (xh ^ q[24] ^ m[ 8]) + (SHL32(xl, 8) ^ q[23] ^ q[ 8]);
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h[ 9] = ROTL32(h[5], 10) + (xh ^ q[25] ^ m[ 9]) + (SHR32(xl, 6) ^ q[16] ^ q[ 9]);
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h[10] = ROTL32(h[6], 11) + (xh ^ q[26] ^ m[10]) + (SHL32(xl, 6) ^ q[17] ^ q[10]);
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h[11] = ROTL32(h[7], 12) + (xh ^ q[27] ^ m[11]) + (SHL32(xl, 4) ^ q[18] ^ q[11]);
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h[12] = ROTL32(h[0], 13) + (xh ^ q[28] ^ m[12]) + (SHR32(xl, 3) ^ q[19] ^ q[12]);
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h[13] = ROTL32(h[1], 14) + (xh ^ q[29] ^ m[13]) + (SHR32(xl, 4) ^ q[20] ^ q[13]);
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h[14] = ROTL32(h[2], 15) + (xh ^ q[30] ^ m[14]) + (SHR32(xl, 7) ^ q[21] ^ q[14]);
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h[15] = ROTL32(h[3], 16) + (xh ^ q[31] ^ m[15]) + (SHR32(xl, 2) ^ q[22] ^ q[15]);
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}
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void bmw_small_nextBlock(bmw_small_ctx_t* ctx, const void* block){
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uint32_t q[32];
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dump_x(block, 16, 'M');
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bmw_small_f0(q, ctx->h, block);
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dump_x(q, 16, 'Q');
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bmw_small_f1(q, block, ctx->h);
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dump_x(q, 32, 'Q');
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bmw_small_f2(ctx->h, q, block);
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ctx->counter += 1;
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ctx_dump(ctx);
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}
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void bmw_small_lastBlock(bmw_small_ctx_t* ctx, const void* block, uint16_t length_b){
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uint8_t buffer[64];
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while(length_b >= BMW_SMALL_BLOCKSIZE){
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bmw_small_nextBlock(ctx, block);
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length_b -= BMW_SMALL_BLOCKSIZE;
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block = (uint8_t*)block + BMW_SMALL_BLOCKSIZE_B;
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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>>3] |= 0x80 >> (length_b&0x07);
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if(length_b+1>64*8-64){
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bmw_small_nextBlock(ctx, buffer);
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memset(buffer, 0, 64-8);
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ctx->counter -= 1;
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}
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*((uint64_t*)&(buffer[64-8])) = (uint64_t)(ctx->counter*512LL)+(uint64_t)length_b;
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bmw_small_nextBlock(ctx, buffer);
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uint8_t i;
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uint32_t q[32];
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memset(buffer, 0xaa, 64);
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for(i=0; i<16;++i){
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buffer[i*4] = i+0xa0;
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}
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// dump_x(buffer, 16, 'A');
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dump_x(ctx->h, 16, 'M');
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bmw_small_f0(q, (uint32_t*)buffer, ctx->h);
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dump_x(buffer, 16, 'a');
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dump_x(q, 16, 'Q');
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bmw_small_f1(q, ctx->h, (uint32_t*)buffer);
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dump_x(q, 32, 'Q');
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bmw_small_f2((uint32_t*)buffer, q, ctx->h);
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memcpy(ctx->h, buffer, 64);
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}
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void bmw224_init(bmw224_ctx_t* ctx){
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uint8_t i;
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ctx->h[0] = 0x00010203;
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for(i=1; i<16; ++i){
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ctx->h[i] = ctx->h[i-1]+ 0x04040404;
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}
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ctx->counter=0;
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ctx_dump(ctx);
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}
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void bmw256_init(bmw256_ctx_t* ctx){
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uint8_t i;
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ctx->h[0] = 0x40414243;
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for(i=1; i<16; ++i){
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ctx->h[i] = ctx->h[i-1]+ 0x04040404;
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}
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ctx->counter=0;
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ctx_dump(ctx);
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}
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void bmw224_nextBlock(bmw224_ctx_t* ctx, const void* block){
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bmw_small_nextBlock(ctx, block);
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}
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void bmw256_nextBlock(bmw256_ctx_t* ctx, const void* block){
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bmw_small_nextBlock(ctx, block);
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}
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void bmw224_lastBlock(bmw224_ctx_t* ctx, const void* block, uint16_t length_b){
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bmw_small_lastBlock(ctx, block, length_b);
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}
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void bmw256_lastBlock(bmw256_ctx_t* ctx, const void* block, uint16_t length_b){
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bmw_small_lastBlock(ctx, block, length_b);
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}
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void bmw224_ctx2hash(void* dest, const bmw224_ctx_t* ctx){
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memcpy(dest, &(ctx->h[9]), 224/8);
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}
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void bmw256_ctx2hash(void* dest, const bmw256_ctx_t* ctx){
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memcpy(dest, &(ctx->h[8]), 256/8);
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}
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void bmw224(void* dest, const void* msg, uint32_t length_b){
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bmw_small_ctx_t ctx;
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bmw224_init(&ctx);
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while(length_b>=BMW_SMALL_BLOCKSIZE){
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bmw_small_nextBlock(&ctx, msg);
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length_b -= BMW_SMALL_BLOCKSIZE;
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msg = (uint8_t*)msg + BMW_SMALL_BLOCKSIZE_B;
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}
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bmw_small_lastBlock(&ctx, msg, length_b);
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bmw224_ctx2hash(dest, &ctx);
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}
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void bmw256(void* dest, const void* msg, uint32_t length_b){
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bmw_small_ctx_t ctx;
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bmw256_init(&ctx);
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while(length_b>=BMW_SMALL_BLOCKSIZE){
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bmw_small_nextBlock(&ctx, msg);
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length_b -= BMW_SMALL_BLOCKSIZE;
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msg = (uint8_t*)msg + BMW_SMALL_BLOCKSIZE_B;
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}
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bmw_small_lastBlock(&ctx, msg, length_b);
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bmw256_ctx2hash(dest, &ctx);
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}
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