+++ /dev/null
-/* bmw_small.c */
-/*
- This file is part of the AVR-Crypto-Lib.
- Copyright (C) 2009 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/>.
-*/
-/*
- * \file bmw_small.c
- * \author Daniel Otte
- * \email daniel.otte@rub.de
- * \date 2009-04-27
- * \license GPLv3 or later
- *
- */
-
-#include <stdint.h>
-#include <string.h>
-#include <avr/pgmspace.h>
-#include "bmw_small.h"
-
-
-#define SHL32(a,n) ((a)<<(n))
-#define SHR32(a,n) ((a)>>(n))
-#define ROTL32(a,n) (((a)<<(n))|((a)>>(32-(n))))
-#define ROTR32(a,n) (((a)>>(n))|((a)<<(32-(n))))
-
-#define BUG24 0
-#define F0_HACK 1
-
-#define DEBUG 0
-#if DEBUG
- #include "cli.h"
-
- void ctx_dump(const bmw_small_ctx_t* ctx){
- uint8_t i;
- cli_putstr_P(PSTR("\r\n==== ctx dump ===="));
- for(i=0; i<16;++i){
- cli_putstr_P(PSTR("\r\n h["));
- cli_hexdump(&i, 1);
- cli_putstr_P(PSTR("] = "));
- cli_hexdump_rev(&(ctx->h[i]), 4);
- }
- cli_putstr_P(PSTR("\r\n counter = "));
- cli_hexdump(&(ctx->counter), 4);
- }
-
- void dump_x(const uint32_t* q, uint8_t elements, char x){
- uint8_t i;
- cli_putstr_P(PSTR("\r\n==== "));
- cli_putc(x);
- cli_putstr_P(PSTR(" dump ===="));
- for(i=0; i<elements;++i){
- cli_putstr_P(PSTR("\r\n "));
- cli_putc(x);
- cli_putstr_P(PSTR("["));
- cli_hexdump(&i, 1);
- cli_putstr_P(PSTR("] = "));
- cli_hexdump_rev(&(q[i]), 4);
- }
- }
-#else
- #define ctx_dump(x)
- #define dump_x(a,b,c)
-#endif
-
-uint32_t bmw_small_s0(uint32_t x){
- uint32_t r;
- r = SHR32(x, 1)
- ^ SHL32(x, 3)
- ^ ROTL32(x, 4)
- ^ ROTR32(x, 13);
- return r;
-}
-
-uint32_t bmw_small_s1(uint32_t x){
- uint32_t r;
- r = SHR32(x, 1)
- ^ SHL32(x, 2)
- ^ ROTL32(x, 8)
- ^ ROTR32(x, 9);
- return r;
-}
-
-uint32_t bmw_small_s2(uint32_t x){
- uint32_t r;
- r = SHR32(x, 2)
- ^ SHL32(x, 1)
- ^ ROTL32(x, 12)
- ^ ROTR32(x, 7);
- return r;
-}
-
-uint32_t bmw_small_s3(uint32_t x){
- uint32_t r;
- r = SHR32(x, 2)
- ^ SHL32(x, 2)
- ^ ROTL32(x, 15)
- ^ ROTR32(x, 3);
- return r;
-}
-
-uint32_t bmw_small_s4(uint32_t x){
- uint32_t r;
- r = SHR32(x, 1)
- ^ x;
- return r;
-}
-
-uint32_t bmw_small_s5(uint32_t x){
- uint32_t r;
- r = SHR32(x, 2)
- ^ x;
- return r;
-}
-
-uint32_t bmw_small_r1(uint32_t x){
- uint32_t r;
- r = ROTL32(x, 3);
- return r;
-}
-
-uint32_t bmw_small_r2(uint32_t x){
- uint32_t r;
- r = ROTL32(x, 7);
- return r;
-}
-
-uint32_t bmw_small_r3(uint32_t x){
- uint32_t r;
- r = ROTL32(x, 13);
- return r;
-}
-
-uint32_t bmw_small_r4(uint32_t x){
- uint32_t r;
- r = ROTL32(x, 16);
- return r;
-}
-
-uint32_t bmw_small_r5(uint32_t x){
- uint32_t r;
- r = ROTR32(x, 13);
- return r;
-}
-
-uint32_t bmw_small_r6(uint32_t x){
- uint32_t r;
- r = ROTR32(x, 9);
- return r;
-}
-
-uint32_t bmw_small_r7(uint32_t x){
- uint32_t r;
- r = ROTR32(x, 5);
- return r;
-}
-/*
-#define K 0x05555555L
-static
-uint32_t k_lut[] PROGMEM = {
- 16L*K, 17L*K, 18L*K, 19L*K, 20L*K, 21L*K, 22L*K, 23L*K,
- 24L*K, 25L*K, 26L*K, 27L*K, 28L*K, 29L*K, 30L*K, 31L*K
-};
-*/
-/* same as above but precomputed to avoid compiler warnings */
-
-static
-uint32_t k_lut[] PROGMEM = {
- 0x55555550L, 0x5aaaaaa5L, 0x5ffffffaL,
- 0x6555554fL, 0x6aaaaaa4L, 0x6ffffff9L,
- 0x7555554eL, 0x7aaaaaa3L, 0x7ffffff8L,
- 0x8555554dL, 0x8aaaaaa2L, 0x8ffffff7L,
- 0x9555554cL, 0x9aaaaaa1L, 0x9ffffff6L,
- 0xa555554bL };
-
-
-uint32_t bmw_small_expand1(uint8_t j, const uint32_t* q, const void* m){
- uint32_t(*s[])(uint32_t) = {bmw_small_s1, bmw_small_s2, bmw_small_s3, bmw_small_s0};
- uint32_t r;
- uint8_t i;
- /* r = 0x05555555*(j+16); */
- r = pgm_read_dword(k_lut+j);
- for(i=0; i<16; ++i){
- r += s[i%4](q[j+i]);
- }
- r += ((uint32_t*)m)[j];
- r += ((uint32_t*)m)[j+3];
- r -= ((uint32_t*)m)[j+10];
- return r;
-}
-
-uint32_t bmw_small_expand2(uint8_t j, const uint32_t* q, const void* m){
- uint32_t(*rf[])(uint32_t) = {bmw_small_r1, bmw_small_r2, bmw_small_r3,
- bmw_small_r4, bmw_small_r5, bmw_small_r6,
- bmw_small_r7};
- uint32_t r;
- uint8_t i;
- /* r = 0x05555555*(j+16); */
- r = pgm_read_dword(k_lut+j);
- for(i=0; i<14; i+=2){
- r += q[j+i];
- }
- for(i=0; i<14; i+=2){
- r += rf[i/2](q[j+i+1]);
- }
- r += bmw_small_s5(q[j+14]);
- r += bmw_small_s4(q[j+15]);
- r += ((uint32_t*)m)[j];
- r += ((uint32_t*)m)[(j+3)%16];
- r -= ((uint32_t*)m)[(j+10)%16];
- return r;
-}
-#if F0_HACK
-static
-uint8_t f0_lut[] PROGMEM = {
- 5<<1, ( 7<<1)+1, (10<<1)+0, (13<<1)+0, (14<<1)+0,
- 6<<1, ( 8<<1)+1, (11<<1)+0, (14<<1)+0, (15<<1)+1,
- 0<<1, ( 7<<1)+0, ( 9<<1)+0, (12<<1)+1, (15<<1)+0,
- 0<<1, ( 1<<1)+1, ( 8<<1)+0, (10<<1)+1, (13<<1)+0,
- 1<<1, ( 2<<1)+0, ( 9<<1)+0, (11<<1)+1, (14<<1)+1,
- 3<<1, ( 2<<1)+1, (10<<1)+0, (12<<1)+1, (15<<1)+0,
- 4<<1, ( 0<<1)+1, ( 3<<1)+1, (11<<1)+1, (13<<1)+0,
- 1<<1, ( 4<<1)+1, ( 5<<1)+1, (12<<1)+1, (14<<1)+1,
- 2<<1, ( 5<<1)+1, ( 6<<1)+1, (13<<1)+0, (15<<1)+1,
- 0<<1, ( 3<<1)+1, ( 6<<1)+0, ( 7<<1)+1, (14<<1)+0,
- 8<<1, ( 1<<1)+1, ( 4<<1)+1, ( 7<<1)+1, (15<<1)+0,
- 8<<1, ( 0<<1)+1, ( 2<<1)+1, ( 5<<1)+1, ( 9<<1)+0,
- 1<<1, ( 3<<1)+0, ( 6<<1)+1, ( 9<<1)+1, (10<<1)+0,
- 2<<1, ( 4<<1)+0, ( 7<<1)+0, (10<<1)+0, (11<<1)+0,
- 3<<1, ( 5<<1)+1, ( 8<<1)+0, (11<<1)+1, (12<<1)+1,
- 12<<1, ( 4<<1)+1, ( 6<<1)+1, ( 9<<1)+1, (13<<1)+0
-};
-
-void bmw_small_f0(uint32_t* q, uint32_t* h, const void* m){
- uint8_t i,j=-1,v,sign,l=0;
- uint32_t(*s[])(uint32_t)={ bmw_small_s0, bmw_small_s1, bmw_small_s2,
- bmw_small_s3, bmw_small_s4 };
- for(i=0; i<16; ++i){
- h[i] ^= ((uint32_t*)m)[i];
- }
- dump_x(h, 16, 'T');
- // memset(q, 0, 4*16);
- for(i=0; i<5*16; ++i){
- v = pgm_read_byte(f0_lut+i);
- sign = v&1;
- v >>=1;
- if(i==l){
- j++;
- l+=5;
- q[j] = h[v];
- continue;
- }
- if(sign){
- q[j] -= h[v];
- }else{
- q[j] += h[v];
- }
- }
- dump_x(q, 16, 'W');
- for(i=0; i<16; ++i){
- q[i] = s[i%5](q[i]);
- }
-}
-
-#else
-void bmw_small_f0(uint32_t* q, uint32_t* h, const void* m){
- uint8_t i;
- uint32_t(*s[])(uint32_t)={ bmw_small_s0, bmw_small_s1, bmw_small_s2,
- bmw_small_s3, bmw_small_s4 };
- for(i=0; i<16; ++i){
- h[i] ^= ((uint32_t*)m)[i];
- }
- dump_x(h, 16, 'T');
- q[ 0] = (h[ 5] - h[ 7] + h[10] + h[13] + h[14]);
- q[ 1] = (h[ 6] - h[ 8] + h[11] + h[14] - h[15]);
- q[ 2] = (h[ 0] + h[ 7] + h[ 9] - h[12] + h[15]);
- q[ 3] = (h[ 0] - h[ 1] + h[ 8] - h[10] + h[13]);
- q[ 4] = (h[ 1] + h[ 2] + h[ 9] - h[11] - h[14]);
- q[ 5] = (h[ 3] - h[ 2] + h[10] - h[12] + h[15]);
- q[ 6] = (h[ 4] - h[ 0] - h[ 3] - h[11] + h[13]);
- q[ 7] = (h[ 1] - h[ 4] - h[ 5] - h[12] - h[14]);
- q[ 8] = (h[ 2] - h[ 5] - h[ 6] + h[13] - h[15]);
- q[ 9] = (h[ 0] - h[ 3] + h[ 6] - h[ 7] + h[14]);
- q[10] = (h[ 8] - h[ 1] - h[ 4] - h[ 7] + h[15]);
- q[11] = (h[ 8] - h[ 0] - h[ 2] - h[ 5] + h[ 9]);
- q[12] = (h[ 1] + h[ 3] - h[ 6] - h[ 9] + h[10]);
- q[13] = (h[ 2] + h[ 4] + h[ 7] + h[10] + h[11]);
- q[14] = (h[ 3] - h[ 5] + h[ 8] - h[11] - h[12]);
- q[15] = (h[12] - h[ 4] - h[ 6] - h[ 9] + h[13]);
- dump_x(q, 16, 'W');
- for(i=0; i<16; ++i){
- q[i] = s[i%5](q[i]);
- }
-}
-#endif
-
-void bmw_small_f1(uint32_t* q, const void* m){
- uint8_t i;
- q[16] = bmw_small_expand1(0, q, m);
- q[17] = bmw_small_expand1(1, q, m);
- for(i=2; i<16; ++i){
- q[16+i] = bmw_small_expand2(i, q, m);
- }
-}
-
-void bmw_small_f2(uint32_t* h, const uint32_t* q, const void* m){
- uint32_t xl=0, xh;
- uint8_t i;
- for(i=16;i<24;++i){
- xl ^= q[i];
- }
- xh = xl;
- for(i=24;i<32;++i){
- xh ^= q[i];
- }
-#if DEBUG
- cli_putstr_P(PSTR("\r\n XL = "));
- cli_hexdump_rev(&xl, 4);
- cli_putstr_P(PSTR("\r\n XH = "));
- cli_hexdump_rev(&xh, 4);
-#endif
- memcpy(h, m, 16*4);
- h[0] ^= SHL32(xh, 5) ^ SHR32(q[16], 5);
- h[1] ^= SHR32(xh, 7) ^ SHL32(q[17], 8);
- h[2] ^= SHR32(xh, 5) ^ SHL32(q[18], 5);
- h[3] ^= SHR32(xh, 1) ^ SHL32(q[19], 5);
- h[4] ^= SHR32(xh, 3) ^ q[20];
- h[5] ^= SHL32(xh, 6) ^ SHR32(q[21], 6);
- h[6] ^= SHR32(xh, 4) ^ SHL32(q[22], 6);
- h[7] ^= SHR32(xh,11) ^ SHL32(q[23], 2);
- for(i=0; i<8; ++i){
- h[i] += xl ^ q[24+i] ^ q[i];
- }
- for(i=0; i<8; ++i){
- h[8+i] ^= xh ^ q[24+i];
- h[8+i] += ROTL32(h[(4+i)%8],i+9);
- }
- h[ 8] += SHL32(xl, 8) ^ q[23] ^ q[ 8];
- h[ 9] += SHR32(xl, 6) ^ q[16] ^ q[ 9];
- h[10] += SHL32(xl, 6) ^ q[17] ^ q[10];
- h[11] += SHL32(xl, 4) ^ q[18] ^ q[11];
- h[12] += SHR32(xl, 3) ^ q[19] ^ q[12];
- h[13] += SHR32(xl, 4) ^ q[20] ^ q[13];
- h[14] += SHR32(xl, 7) ^ q[21] ^ q[14];
- h[15] += SHR32(xl, 2) ^ q[22] ^ q[15];
-}
-
-void bmw_small_nextBlock(bmw_small_ctx_t* ctx, const void* block){
- uint32_t q[32];
- dump_x(block, 16, 'M');
- bmw_small_f0(q, ctx->h, block);
- dump_x(q, 16, 'Q');
- bmw_small_f1(q, block);
- dump_x(q, 32, 'Q');
- bmw_small_f2(ctx->h, q, block);
- ctx->counter += 1;
- ctx_dump(ctx);
-}
-
-void bmw_small_lastBlock(bmw_small_ctx_t* ctx, const void* block, uint16_t length_b){
- uint8_t buffer[64];
- while(length_b >= BMW_SMALL_BLOCKSIZE){
- bmw_small_nextBlock(ctx, block);
- length_b -= BMW_SMALL_BLOCKSIZE;
- block = (uint8_t*)block + BMW_SMALL_BLOCKSIZE_B;
- }
- memset(buffer, 0, 64);
- memcpy(buffer, block, (length_b+7)/8);
- buffer[length_b>>3] |= 0x80 >> (length_b&0x07);
- if(length_b+1>64*8-64){
- bmw_small_nextBlock(ctx, buffer);
- memset(buffer, 0, 64-8);
- ctx->counter -= 1;
- }
- *((uint64_t*)&(buffer[64-8])) = (uint64_t)(ctx->counter*512LL)+(uint64_t)length_b;
- bmw_small_nextBlock(ctx, buffer);
-}
-
-void bmw224_init(bmw224_ctx_t* ctx){
- uint8_t i;
- ctx->h[0] = 0x00010203;
- for(i=1; i<16; ++i){
- ctx->h[i] = ctx->h[i-1]+ 0x04040404;
- }
-#if BUG24
- ctx->h[13] = 0x24353637;
-#endif
- ctx->counter=0;
- ctx_dump(ctx);
-}
-
-void bmw256_init(bmw256_ctx_t* ctx){
- uint8_t i;
- ctx->h[0] = 0x40414243;
- for(i=1; i<16; ++i){
- ctx->h[i] = ctx->h[i-1]+ 0x04040404;
- }
- ctx->counter=0;
- ctx_dump(ctx);
-}
-
-void bmw224_nextBlock(bmw224_ctx_t* ctx, const void* block){
- bmw_small_nextBlock(ctx, block);
-}
-
-void bmw256_nextBlock(bmw256_ctx_t* ctx, const void* block){
- bmw_small_nextBlock(ctx, block);
-}
-
-void bmw224_lastBlock(bmw224_ctx_t* ctx, const void* block, uint16_t length_b){
- bmw_small_lastBlock(ctx, block, length_b);
-}
-
-void bmw256_lastBlock(bmw256_ctx_t* ctx, const void* block, uint16_t length_b){
- bmw_small_lastBlock(ctx, block, length_b);
-}
-
-void bmw224_ctx2hash(void* dest, const bmw224_ctx_t* ctx){
- memcpy(dest, &(ctx->h[9]), 224/8);
-}
-
-void bmw256_ctx2hash(void* dest, const bmw256_ctx_t* ctx){
- memcpy(dest, &(ctx->h[8]), 256/8);
-}
-
-void bmw224(void* dest, const void* msg, uint32_t length_b){
- bmw_small_ctx_t ctx;
- bmw224_init(&ctx);
- while(length_b>=BMW_SMALL_BLOCKSIZE){
- bmw_small_nextBlock(&ctx, msg);
- length_b -= BMW_SMALL_BLOCKSIZE;
- msg = (uint8_t*)msg + BMW_SMALL_BLOCKSIZE_B;
- }
- bmw_small_lastBlock(&ctx, msg, length_b);
- bmw224_ctx2hash(dest, &ctx);
-}
-
-void bmw256(void* dest, const void* msg, uint32_t length_b){
- bmw_small_ctx_t ctx;
- bmw256_init(&ctx);
- while(length_b>=BMW_SMALL_BLOCKSIZE){
- bmw_small_nextBlock(&ctx, msg);
- length_b -= BMW_SMALL_BLOCKSIZE;
- msg = (uint8_t*)msg + BMW_SMALL_BLOCKSIZE_B;
- }
- bmw_small_lastBlock(&ctx, msg, length_b);
- bmw256_ctx2hash(dest, &ctx);
-}
-
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