--- /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);
+}
+
projects / avr-crypto-lib.git / blobdiff