blake_small.c

   1 /* blake_small.c */
   2 /*
   3     This file is part of the AVR-Crypto-Lib.
   4     Copyright (C) 2009  Daniel Otte (daniel.otte@rub.de)
   5
   6     This program is free software: you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation, either version 3 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19 /*
  20  * \file    blake_small.c
  21  * \author  Daniel Otte
  22  * \email   daniel.otte@rub.de
  23  * \date    2009-05-04
  24  * \license GPLv3 or later
  25  *
  26  */
  27
  28 #include <stdint.h>
  29 #include <string.h>
  30 #include <avr/pgmspace.h>
  31 #include "memxor.h"
  32 #include "blake_small.h"
  33 #include "blake_common.h"
  34
  35 #define BUG_1 0 /* bug compatibility for zero length message */
  36 #define BUG_2 0 /* bug compatibility for messages of length%512=505...511 */
  37
  38
  39 uint32_t blake_c[] PROGMEM = {
  40    0x243F6A88, 0x85A308D3,
  41    0x13198A2E, 0x03707344,
  42    0xA4093822, 0x299F31D0,
  43    0x082EFA98, 0xEC4E6C89,
  44    0x452821E6, 0x38D01377,
  45    0xBE5466CF, 0x34E90C6C,
  46    0xC0AC29B7, 0xC97C50DD,
  47    0x3F84D5B5, 0xB5470917
  48 };
  49
  50 #define ROTL32(a, n) (((a)<<(n))|((a)>>(32-(n))))
  51 #define ROTR32(a, n) (((a)>>(n))|((a)<<(32-(n))))
  52 #define CHANGE_ENDIAN32(a) (((a)<<24)| \
  53                             ((0x0000ff00&(a))<<8)| \
  54                                                     ((0x00ff0000&(a))>>8)| \
  55                                                     (a)>>24 )
  56
  57 void blake_small_g(uint8_t r, uint8_t i, uint32_t* v, const uint32_t* m){
  58         uint8_t a,b,c,d, s0, s1;
  59         a = pgm_read_byte(blake_index_lut+4*i+0);
  60         b = pgm_read_byte(blake_index_lut+4*i+1);
  61         c = pgm_read_byte(blake_index_lut+4*i+2);
  62         d = pgm_read_byte(blake_index_lut+4*i+3);
  63         s0 = pgm_read_byte(blake_sigma+16*r+2*i+0);
  64         s1 = pgm_read_byte(blake_sigma+16*r+2*i+1);
  65         v[a] += v[b] + (m[s0] ^ pgm_read_dword(&(blake_c[s1])));
  66         v[d]  = ROTR32(v[d]^v[a], 16);
  67         v[c] += v[d];
  68         v[b]  = ROTR32(v[b]^v[c], 12);
  69         v[a] += v[b] + (m[s1] ^ pgm_read_dword(&(blake_c[s0])));
  70         v[d]  = ROTR32(v[d]^v[a], 8);
  71         v[c] += v[d];
  72         v[b]  = ROTR32(v[b]^v[c], 7);
  73
  74 }
  75
  76 void blake_small_expand(uint32_t* v, const blake_small_ctx_t* ctx){
  77         uint8_t i;
  78         memcpy(v, ctx->h, 8*4);
  79         for(i=0; i<8; ++i){
  80                 v[8+i] = pgm_read_dword(&(blake_c[i]));
  81         }
  82         memxor((uint8_t*)v+8, ctx->s, 4*4);
  83
  84 }
  85
  86 void blake_small_changeendian(void* dest, const void* src){
  87         uint8_t i;
  88         for(i=0; i<16; ++i){
  89                 ((uint32_t*)dest)[i] = CHANGE_ENDIAN32(((uint32_t*)src)[i]);
  90         }
  91 }
  92
  93 void blake_small_compress(uint32_t* v,const void* m){
  94         uint8_t r,i;
  95         for(r=0; r<10; ++r){
  96                 for(i=0; i<8; ++i){
  97                         blake_small_g(r, i, v, (uint32_t*)m);
  98                 }
  99         }
 100 }
 101
 102 void blake_small_collapse(blake_small_ctx_t* ctx, uint32_t* v){
 103         uint8_t i;
 104         for(i=0; i<8; ++i){
 105                 ctx->h[i] ^= ctx->s[i%4] ^ v[i] ^ v[8+i];
 106         }
 107 }
 108
 109 void blake_small_nextBlock(blake_small_ctx_t* ctx, const void* msg){
 110         uint32_t v[16];
 111         uint32_t m[16];
 112         union {
 113                 uint64_t v64;
 114                 uint32_t v32[2];
 115         }ctr;
 116         blake_small_expand(v,ctx);
 117         ctx->counter++;
 118         ctr.v64 = ctx->counter*512;
 119         v[12] ^= ctr.v32[0];
 120         v[13] ^= ctr.v32[0];
 121         v[14] ^= ctr.v32[1];
 122         v[15] ^= ctr.v32[1];
 123         blake_small_changeendian(m, msg);
 124         blake_small_compress(v, m);
 125         blake_small_collapse(ctx, v);
 126 }
 127
 128 void blake_small_lastBlock(blake_small_ctx_t* ctx, const void* msg, uint16_t length_b){
 129         while(length_b>=BLAKE_SMALL_BLOCKSIZE){
 130                 blake_small_nextBlock(ctx, msg);
 131                 msg = (uint8_t*)msg + BLAKE_SMALL_BLOCKSIZE_B;
 132                 length_b -= BLAKE_SMALL_BLOCKSIZE;
 133         }
 134         uint8_t buffer[64];
 135         uint32_t v[16];
 136 #if BUG_2
 137         uint32_t tmp=0;
 138 #endif
 139         union {
 140                 uint64_t v64;
 141                 uint32_t v32[2];
 142         }ctr;
 143         ctr.v64 = ctx->counter*512+length_b;
 144 #if BUG_2
 145         if(length_b>=505){
 146                 tmp =ctr.v32[0];
 147                 ctr.v32[0] = ctx->counter*512;
 148                 ctr.v32[0] |= 0x40+length_b-504;
 149         }
 150 #endif
 151         memset(buffer, 0, 64);
 152         memcpy(buffer, msg, (length_b+7)/8);
 153         buffer[length_b/8] |= 0x80 >> (length_b%8);
 154         blake_small_changeendian(buffer, buffer);
 155         blake_small_expand(v, ctx);
 156         v[12] ^= ctr.v32[0];
 157         v[13] ^= ctr.v32[0];
 158         v[14] ^= ctr.v32[1];
 159         v[15] ^= ctr.v32[1];
 160 #if BUG_2
 161         if(length_b>=505)
 162                 ctr.v32[0] = tmp;
 163 #endif
 164 #if BUG_1
 165         if(length_b==0 && ctx->counter==0){
 166                 v[14] ^= 1;
 167                 v[15] ^= 1;
 168         }
 169 #endif
 170         if(length_b>512-64-2){
 171                 blake_small_compress(v, buffer);
 172                 blake_small_collapse(ctx, v);
 173                 memset(buffer, 0, 64-8);
 174                 blake_small_expand(v, ctx);
 175         }
 176         if(ctx->appendone)
 177                 buffer[64-8-4] |= 0x01;
 178         *((uint32_t*)(&(buffer[64-8]))) = ctr.v32[1];
 179         *((uint32_t*)(&(buffer[64-4]))) = ctr.v32[0];
 180         blake_small_compress(v, buffer);
 181         blake_small_collapse(ctx, v);
 182
 183 }
 184
 185 uint32_t blake32_iv[] PROGMEM = {
 186         0x6A09E667L, 0xBB67AE85,
 187         0x3C6EF372L, 0xA54FF53A,
 188         0x510E527FL, 0x9B05688C,
 189         0x1F83D9ABL, 0x5BE0CD19
 190 };
 191
 192 void blake32_init(blake32_ctx_t* ctx){
 193         uint8_t i;
 194         for(i=0; i<8; ++i){
 195                 ctx->h[i] = pgm_read_dword(&(blake32_iv[i]));
 196         }
 197         memset(ctx->s, 0, 4*4);
 198         ctx->counter = 0;
 199         ctx->appendone = 1;
 200 }
 201
 202 uint32_t blake28_iv[] PROGMEM = {
 203         0xC1059ED8, 0x367CD507,
 204         0x3070DD17, 0xF70E5939,
 205         0xFFC00B31, 0x68581511,
 206         0x64F98FA7, 0xBEFA4FA4
 207 };
 208
 209 void blake28_init(blake28_ctx_t* ctx){
 210         uint8_t i;
 211         for(i=0; i<8; ++i){
 212                 ctx->h[i] = pgm_read_dword(&(blake28_iv[i]));
 213         }
 214         memset(ctx->s, 0, 4*4);
 215         ctx->counter = 0;
 216         ctx->appendone = 0;
 217 }
 218
 219 void blake32_ctx2hash(void* dest, const blake32_ctx_t* ctx){
 220         uint8_t i;
 221         for(i=0; i<8; ++i){
 222                 ((uint32_t*)dest)[i] = CHANGE_ENDIAN32(ctx->h[i]);
 223         }
 224 }
 225
 226 void blake28_ctx2hash(void* dest, const blake28_ctx_t* ctx){
 227         uint8_t i;
 228         for(i=0; i<7; ++i){
 229                 ((uint32_t*)dest)[i] = CHANGE_ENDIAN32(ctx->h[i]);
 230         }
 231 }
 232
 233 void blake32_nextBlock(blake32_ctx_t* ctx, const void* block){
 234         blake_small_nextBlock(ctx, block);
 235 }
 236
 237 void blake28_nextBlock(blake28_ctx_t* ctx, const void* block){
 238         blake_small_nextBlock(ctx, block);
 239 }
 240
 241 void blake32_lastBlock(blake32_ctx_t* ctx, const void* block, uint16_t length_b){
 242         blake_small_lastBlock(ctx, block, length_b);
 243 }
 244
 245 void blake28_lastBlock(blake28_ctx_t* ctx, const void* block, uint16_t length_b){
 246         blake_small_lastBlock(ctx, block, length_b);
 247 }
 248
 249 void blake32(void* dest, const void* msg, uint32_t length_b){
 250         blake_small_ctx_t ctx;
 251         blake32_init(&ctx);
 252         while(length_b>=BLAKE_SMALL_BLOCKSIZE){
 253                 blake_small_nextBlock(&ctx, msg);
 254                 msg = (uint8_t*)msg + BLAKE_SMALL_BLOCKSIZE_B;
 255                 length_b -= BLAKE_SMALL_BLOCKSIZE;
 256         }
 257         blake_small_lastBlock(&ctx, msg, length_b);
 258         blake32_ctx2hash(dest, &ctx);
 259 }
 260
 261 void blake28(void* dest, const void* msg, uint32_t length_b){
 262         blake_small_ctx_t ctx;
 263         blake28_init(&ctx);
 264         while(length_b>=BLAKE_SMALL_BLOCKSIZE){
 265                 blake_small_nextBlock(&ctx, msg);
 266                 msg = (uint8_t*)msg + BLAKE_SMALL_BLOCKSIZE_B;
 267                 length_b -= BLAKE_SMALL_BLOCKSIZE;
 268         }
 269         blake_small_lastBlock(&ctx, msg, length_b);
 270         blake28_ctx2hash(dest, &ctx);
 271 }