keccak/keccak.c

   1 /* keecak.c */
   2 /*
   3     This file is part of the AVR-Crypto-Lib.
   4     Copyright (C) 2010 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 #include <stdint.h>
  21 #include <stdlib.h>
  22 #include <string.h>
  23 #include <avr/pgmspace.h>
  24 #include "memxor.h"
  25 #include "rotate64.h"
  26 #include "keccak.h"
  27
  28 #ifdef DEBUG
  29 #  undef DEBUG
  30 #endif
  31
  32 #define DEBUG 0
  33
  34 #if DEBUG
  35 #include "cli.h"
  36
  37 void keccak_dump_state(uint64_t a[5][5]){
  38         uint8_t i,j;
  39         for(i=0; i<5; ++i){
  40                 cli_putstr_P(PSTR("\r\n"));
  41                 cli_putc('0'+i);
  42                 cli_putstr_P(PSTR(": "));
  43                 for(j=0; j<5; ++j){
  44                         cli_hexdump_rev(&(a[i][j]), 8);
  45                         cli_putc(' ');
  46                 }
  47         }
  48 }
  49
  50 void keccak_dump_ctx(keccak_ctx_t* ctx){
  51         keccak_dump_state(ctx->a);
  52         cli_putstr_P(PSTR("\r\nDBG: r: "));
  53         cli_hexdump_rev(&(ctx->r), 2);
  54         cli_putstr_P(PSTR("\t c: "));
  55         cli_hexdump_rev(&(ctx->c), 2);
  56         cli_putstr_P(PSTR("\t d: "));
  57         cli_hexdump(&(ctx->d), 1);
  58         cli_putstr_P(PSTR("\t bs: "));
  59         cli_hexdump(&(ctx->bs), 1);
  60 }
  61
  62 #endif
  63
  64 /*
  65 static uint64_t rc[] PROGMEM = {
  66        0x0000000000000001LL, 0x0000000000008082LL,
  67        0x800000000000808ALL, 0x8000000080008000LL,
  68        0x000000000000808BLL, 0x0000000080000001LL,
  69        0x8000000080008081LL, 0x8000000000008009LL,
  70        0x000000000000008ALL, 0x0000000000000088LL,
  71        0x0000000080008009LL, 0x000000008000000ALL,
  72        0x000000008000808BLL, 0x800000000000008BLL,
  73        0x8000000000008089LL, 0x8000000000008003LL,
  74        0x8000000000008002LL, 0x8000000000000080LL,
  75        0x000000000000800ALL, 0x800000008000000ALL,
  76        0x8000000080008081LL, 0x8000000000008080LL,
  77        0x0000000080000001LL, 0x8000000080008008LL
  78 };
  79 */
  80
  81 static uint8_t rc_comp[] PROGMEM = {
  82                 0x01, 0x92, 0xda, 0x70,
  83                 0x9b, 0x21, 0xf1, 0x59,
  84                 0x8a, 0x88, 0x39, 0x2a,
  85                 0xbb, 0xcb, 0xd9, 0x53,
  86                 0x52, 0xc0, 0x1a, 0x6a,
  87                 0xf1, 0xd0, 0x21, 0x78,
  88 };
  89
  90 static uint8_t r[5][5] PROGMEM = {
  91                 { ROT_CODE( 0), ROT_CODE(36), ROT_CODE( 3), ROT_CODE(41), ROT_CODE(18) },
  92                 { ROT_CODE( 1), ROT_CODE(44), ROT_CODE(10), ROT_CODE(45), ROT_CODE( 2) },
  93                 { ROT_CODE(62), ROT_CODE( 6), ROT_CODE(43), ROT_CODE(15), ROT_CODE(61) },
  94                 { ROT_CODE(28), ROT_CODE(55), ROT_CODE(25), ROT_CODE(21), ROT_CODE(56) },
  95                 { ROT_CODE(27), ROT_CODE(20), ROT_CODE(39), ROT_CODE( 8), ROT_CODE(14) }
  96 };
  97
  98 static inline
  99 void keccak_round(uint64_t a[5][5], uint8_t rci){
 100         uint64_t b[5][5];
 101         uint8_t i,j;
 102         union {
 103                         uint64_t v64;
 104                         uint8_t v8[8];
 105                 } t;
 106         /* theta */
 107         for(i=0; i<5; ++i){
 108                 b[i][0] = a[0][i] ^ a[1][i] ^ a[2][i] ^ a[3][i] ^ a[4][i];
 109         }
 110         for(i=0; i<5; ++i){
 111                 t.v64 = b[(4+i)%5][0] ^ rotate64_1bit_left(b[(i+1)%5][0]);
 112                 for(j=0; j<5; ++j){
 113                         a[j][i] ^= t.v64;
 114                 }
 115         }
 116 #if DEBUG
 117         cli_putstr_P(PSTR("\r\nAfter theta:"));
 118         keccak_dump_state(a);
 119 #endif
 120         /* rho & pi */
 121         for(i=0; i<5; ++i){
 122                 for(j=0; j<5; ++j){
 123 //                      b[(2*i+3*j)%5][j] = rotl64(a[j][i], pgm_read_byte(&(r[i][j])));
 124                         b[(2*i+3*j)%5][j] = rotate64left_code(a[j][i], pgm_read_byte(&(r[i][j])));
 125                 }
 126         }
 127 #if DEBUG
 128         cli_putstr_P(PSTR("\r\n--- after rho & pi ---"));
 129         keccak_dump_state(a);
 130 #endif
 131         /* chi */
 132         for(i=0; i<5; ++i){
 133                 for(j=0; j<5; ++j){
 134                         a[j][i] =  b[j][i] ^ ((~(b[j][(i+1)%5]))&(b[j][(i+2)%5]));
 135                 }
 136         }
 137 #if DEBUG
 138         cli_putstr_P(PSTR("\r\nAfter chi:"));
 139         keccak_dump_state(a);
 140 #endif
 141         /* iota */
 142
 143 //      memcpy_P(&t, &(rc_comp[rci]), 8);
 144         t.v64 = 0;
 145         t.v8[0] = pgm_read_byte(&(rc_comp[rci]));
 146         if(t.v8[0]&0x40){
 147                 t.v8[7] = 0x80;
 148         }
 149         if(t.v8[0]&0x20){
 150                 t.v8[3] = 0x80;
 151         }
 152         if(t.v8[0]&0x10){
 153                 t.v8[1] = 0x80;
 154         }
 155         t.v8[0] &= 0x8F;
 156
 157         a[0][0] ^= t.v64;
 158 #if DEBUG
 159         cli_putstr_P(PSTR("\r\nAfter iota:"));
 160         keccak_dump_state(a);
 161 #endif
 162 }
 163
 164 void keccak_f1600(uint64_t a[5][5]){
 165         uint8_t i=0;
 166         do{
 167 #if DEBUG
 168                 cli_putstr_P(PSTR("\r\n\r\n--- Round "));
 169                 cli_hexdump(&i, 1);
 170                 cli_putstr_P(PSTR(" ---"));
 171 #endif
 172                 keccak_round(a, i);
 173         }while(++i<24);
 174 }
 175
 176 void keccak_nextBlock(keccak_ctx_t* ctx, const void* block){
 177         memxor(ctx->a, block, ctx->bs);
 178         keccak_f1600(ctx->a);
 179 }
 180
 181 void keccak_lastBlock(keccak_ctx_t* ctx, const void* block, uint16_t length_b){
 182         while(length_b>=ctx->r){
 183                 keccak_nextBlock(ctx, block);
 184                 block = (uint8_t*)block + ctx->bs;
 185                 length_b -=  ctx->r;
 186         }
 187         uint8_t tmp[ctx->bs];
 188         uint8_t pad[3];
 189         memset(tmp, 0x00, ctx->bs);
 190         memcpy(tmp, block, (length_b+7)/8);
 191         /* appand 1 */
 192         if(length_b&7){
 193                 /* we have some single bits */
 194                 uint8_t t;
 195                 t = tmp[length_b/8]>>(8-(length_b&7));
 196                 t |= 0x01<<(length_b&7);
 197                 tmp[length_b/8] = t;
 198         }else{
 199                 tmp[length_b/8] = 0x01;
 200         }
 201         pad[0] = ctx->d;
 202         pad[1] = ctx->bs;
 203         pad[2] = 0x01;
 204         if(length_b/8+1+3<=ctx->bs){
 205                 memcpy(tmp+length_b/8+1, pad, 3);
 206         }else{
 207                 if(length_b/8+1+2<=ctx->bs){
 208                         memcpy(tmp+length_b/8+1, pad, 2);
 209                         keccak_nextBlock(ctx, tmp);
 210                         memset(tmp, 0x00, ctx->bs);
 211                         tmp[0]=0x01;
 212                 }else{
 213                         if(length_b/8+1+1<=ctx->bs){
 214                                 memcpy(tmp+length_b/8+1, pad, 1);
 215                                 keccak_nextBlock(ctx, tmp);
 216                                 memset(tmp, 0x00, ctx->bs);
 217                                 tmp[0] = ctx->bs;
 218                                 tmp[1] = 0x01;
 219                         }else{
 220                                 keccak_nextBlock(ctx, tmp);
 221                                 memset(tmp, 0x00, ctx->bs);
 222                                 tmp[0] = ctx->d;
 223                                 tmp[1] = ctx->bs;
 224                                 tmp[2] = 0x01;
 225                         }
 226                 }
 227         }
 228         keccak_nextBlock(ctx, tmp);
 229 }
 230
 231 void keccak_ctx2hash(void* dest, uint16_t length_b, keccak_ctx_t* ctx){
 232         while(length_b>=ctx->r){
 233                 memcpy(dest, ctx->a, ctx->bs);
 234                 dest = (uint8_t*)dest + ctx->bs;
 235                 length_b -= ctx->r;
 236                 keccak_f1600(ctx->a);
 237         }
 238         memcpy(dest, ctx->a, (length_b+7)/8);
 239 }
 240
 241 void keccak224_ctx2hash(void* dest, keccak_ctx_t* ctx){
 242         keccak_ctx2hash(dest, 224, ctx);
 243 }
 244
 245 void keccak256_ctx2hash(void* dest, keccak_ctx_t* ctx){
 246         keccak_ctx2hash(dest, 256, ctx);
 247 }
 248
 249 void keccak384_ctx2hash(void* dest, keccak_ctx_t* ctx){
 250         keccak_ctx2hash(dest, 384, ctx);
 251 }
 252
 253 void keccak512_ctx2hash(void* dest, keccak_ctx_t* ctx){
 254         keccak_ctx2hash(dest, 512, ctx);
 255 }
 256
 257 /*
 258 1. SHA3-224: ⌊Keccak[r = 1152, c = 448, d = 28]⌋224
 259 2. SHA3-256: ⌊Keccak[r = 1088, c = 512, d = 32]⌋256
 260 3. SHA3-384: ⌊Keccak[r = 832, c = 768, d = 48]⌋384
 261 4. SHA3-512: ⌊Keccak[r = 576, c = 1024, d = 64]⌋512
 262 */
 263 void keccak_init(uint16_t r, uint16_t c, uint8_t d, keccak_ctx_t* ctx){
 264         memset(ctx->a, 0x00, 5*5*8);
 265         ctx->r = r;
 266         ctx->c = c;
 267         ctx->d = d;
 268         ctx->bs = (uint8_t)(r/8);
 269 }
 270
 271 void keccak224_init(keccak_ctx_t* ctx){
 272         keccak_init(1152, 448, 28, ctx);
 273 }
 274
 275 void keccak256_init(keccak_ctx_t* ctx){
 276         keccak_init(1088, 512, 32, ctx);
 277 }
 278
 279 void keccak384_init(keccak_ctx_t* ctx){
 280         keccak_init( 832, 768, 48, ctx);
 281 }
 282
 283 void keccak512_init(keccak_ctx_t* ctx){
 284         keccak_init( 576, 1024, 64, ctx);
 285 }