mdw@git.distorted.org.uk Git - secnet/blob - serpent.c

   1 /*
   2  * This file is
   3  *   Copyright (C) 1998 Ross Anderson, Eli Biham, Lars Knudsen
   4  *
   5  * For more information see http://www.cl.cam.ac.uk/users/rja14/serpent.html
   6  *
   7  *  This program is free software; you can redistribute it and/or modify
   8  *  it under the terms of the GNU General Public License as published by
   9  *  the Free Software Foundation; either version 2, or (at your option)
  10  *  any later version.
  11  *
  12  *  This program is distributed in the hope that it will be useful,
  13  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  *  GNU General Public License for more details.
  16  *
  17  *  You should have received a copy of the GNU General Public License
  18  *  along with this program; if not, write to the Free Software Foundation,
  19  *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20  *
  21  */
  22
  23 #include "secnet.h"
  24
  25 #include "serpent.h"
  26 #include "serpentsboxes.h"
  27
  28 void serpent_makekey(struct keyInstance *key, int keyLen,
  29             uint8_t *keyMaterial)
  30 {
  31     uint32_t i,j;
  32     uint32_t w[132],k[132];
  33
  34     for(i=0; i<keyLen/32; i++)
  35         w[i]=keyMaterial[i];
  36     if(keyLen<256)
  37         w[i]=(keyMaterial[i]&((1L<<((keyLen&31)))-1))|(1L<<((keyLen&31)));
  38     for(i++; i<8; i++)
  39         w[i]=0;
  40     for(i=8; i<16; i++)
  41         w[i]=ROL(w[i-8]^w[i-5]^w[i-3]^w[i-1]^PHI^(i-8),11);
  42     for(i=0; i<8; i++)
  43         w[i]=w[i+8];
  44     for(i=8; i<132; i++)
  45         w[i]=ROL(w[i-8]^w[i-5]^w[i-3]^w[i-1]^PHI^i,11);
  46
  47     RND03(w[  0], w[  1], w[  2], w[  3], k[  0], k[  1], k[  2], k[  3]);
  48     RND02(w[  4], w[  5], w[  6], w[  7], k[  4], k[  5], k[  6], k[  7]);
  49     RND01(w[  8], w[  9], w[ 10], w[ 11], k[  8], k[  9], k[ 10], k[ 11]);
  50     RND00(w[ 12], w[ 13], w[ 14], w[ 15], k[ 12], k[ 13], k[ 14], k[ 15]);
  51     RND31(w[ 16], w[ 17], w[ 18], w[ 19], k[ 16], k[ 17], k[ 18], k[ 19]);
  52     RND30(w[ 20], w[ 21], w[ 22], w[ 23], k[ 20], k[ 21], k[ 22], k[ 23]);
  53     RND29(w[ 24], w[ 25], w[ 26], w[ 27], k[ 24], k[ 25], k[ 26], k[ 27]);
  54     RND28(w[ 28], w[ 29], w[ 30], w[ 31], k[ 28], k[ 29], k[ 30], k[ 31]);
  55     RND27(w[ 32], w[ 33], w[ 34], w[ 35], k[ 32], k[ 33], k[ 34], k[ 35]);
  56     RND26(w[ 36], w[ 37], w[ 38], w[ 39], k[ 36], k[ 37], k[ 38], k[ 39]);
  57     RND25(w[ 40], w[ 41], w[ 42], w[ 43], k[ 40], k[ 41], k[ 42], k[ 43]);
  58     RND24(w[ 44], w[ 45], w[ 46], w[ 47], k[ 44], k[ 45], k[ 46], k[ 47]);
  59     RND23(w[ 48], w[ 49], w[ 50], w[ 51], k[ 48], k[ 49], k[ 50], k[ 51]);
  60     RND22(w[ 52], w[ 53], w[ 54], w[ 55], k[ 52], k[ 53], k[ 54], k[ 55]);
  61     RND21(w[ 56], w[ 57], w[ 58], w[ 59], k[ 56], k[ 57], k[ 58], k[ 59]);
  62     RND20(w[ 60], w[ 61], w[ 62], w[ 63], k[ 60], k[ 61], k[ 62], k[ 63]);
  63     RND19(w[ 64], w[ 65], w[ 66], w[ 67], k[ 64], k[ 65], k[ 66], k[ 67]);
  64     RND18(w[ 68], w[ 69], w[ 70], w[ 71], k[ 68], k[ 69], k[ 70], k[ 71]);
  65     RND17(w[ 72], w[ 73], w[ 74], w[ 75], k[ 72], k[ 73], k[ 74], k[ 75]);
  66     RND16(w[ 76], w[ 77], w[ 78], w[ 79], k[ 76], k[ 77], k[ 78], k[ 79]);
  67     RND15(w[ 80], w[ 81], w[ 82], w[ 83], k[ 80], k[ 81], k[ 82], k[ 83]);
  68     RND14(w[ 84], w[ 85], w[ 86], w[ 87], k[ 84], k[ 85], k[ 86], k[ 87]);
  69     RND13(w[ 88], w[ 89], w[ 90], w[ 91], k[ 88], k[ 89], k[ 90], k[ 91]);
  70     RND12(w[ 92], w[ 93], w[ 94], w[ 95], k[ 92], k[ 93], k[ 94], k[ 95]);
  71     RND11(w[ 96], w[ 97], w[ 98], w[ 99], k[ 96], k[ 97], k[ 98], k[ 99]);
  72     RND10(w[100], w[101], w[102], w[103], k[100], k[101], k[102], k[103]);
  73     RND09(w[104], w[105], w[106], w[107], k[104], k[105], k[106], k[107]);
  74     RND08(w[108], w[109], w[110], w[111], k[108], k[109], k[110], k[111]);
  75     RND07(w[112], w[113], w[114], w[115], k[112], k[113], k[114], k[115]);
  76     RND06(w[116], w[117], w[118], w[119], k[116], k[117], k[118], k[119]);
  77     RND05(w[120], w[121], w[122], w[123], k[120], k[121], k[122], k[123]);
  78     RND04(w[124], w[125], w[126], w[127], k[124], k[125], k[126], k[127]);
  79     RND03(w[128], w[129], w[130], w[131], k[128], k[129], k[130], k[131]);
  80
  81     for(i=0; i<=32; i++)
  82         for(j=0; j<4; j++)
  83             key->subkeys[i][j] = k[4*i+j];
  84 }
  85
  86 void serpent_encrypt(struct keyInstance *key,
  87                      uint32_t plaintext[4],
  88                      uint32_t ciphertext[4])
  89 {
  90     register uint32_t x0, x1, x2, x3;
  91     register uint32_t y0, y1, y2, y3;
  92
  93     x0=plaintext[0];
  94     x1=plaintext[1];
  95     x2=plaintext[2];
  96     x3=plaintext[3];
  97
  98     /* Start to encrypt the plaintext x */
  99     keying(x0, x1, x2, x3, key->subkeys[ 0]);
 100     RND00(x0, x1, x2, x3, y0, y1, y2, y3);
 101     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 102     keying(x0, x1, x2, x3, key->subkeys[ 1]);
 103     RND01(x0, x1, x2, x3, y0, y1, y2, y3);
 104     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 105     keying(x0, x1, x2, x3, key->subkeys[ 2]);
 106     RND02(x0, x1, x2, x3, y0, y1, y2, y3);
 107     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 108     keying(x0, x1, x2, x3, key->subkeys[ 3]);
 109     RND03(x0, x1, x2, x3, y0, y1, y2, y3);
 110     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 111     keying(x0, x1, x2, x3, key->subkeys[ 4]);
 112     RND04(x0, x1, x2, x3, y0, y1, y2, y3);
 113     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 114     keying(x0, x1, x2, x3, key->subkeys[ 5]);
 115     RND05(x0, x1, x2, x3, y0, y1, y2, y3);
 116     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 117     keying(x0, x1, x2, x3, key->subkeys[ 6]);
 118     RND06(x0, x1, x2, x3, y0, y1, y2, y3);
 119     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 120     keying(x0, x1, x2, x3, key->subkeys[ 7]);
 121     RND07(x0, x1, x2, x3, y0, y1, y2, y3);
 122     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 123     keying(x0, x1, x2, x3, key->subkeys[ 8]);
 124     RND08(x0, x1, x2, x3, y0, y1, y2, y3);
 125     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 126     keying(x0, x1, x2, x3, key->subkeys[ 9]);
 127     RND09(x0, x1, x2, x3, y0, y1, y2, y3);
 128     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 129     keying(x0, x1, x2, x3, key->subkeys[10]);
 130     RND10(x0, x1, x2, x3, y0, y1, y2, y3);
 131     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 132     keying(x0, x1, x2, x3, key->subkeys[11]);
 133     RND11(x0, x1, x2, x3, y0, y1, y2, y3);
 134     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 135     keying(x0, x1, x2, x3, key->subkeys[12]);
 136     RND12(x0, x1, x2, x3, y0, y1, y2, y3);
 137     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 138     keying(x0, x1, x2, x3, key->subkeys[13]);
 139     RND13(x0, x1, x2, x3, y0, y1, y2, y3);
 140     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 141     keying(x0, x1, x2, x3, key->subkeys[14]);
 142     RND14(x0, x1, x2, x3, y0, y1, y2, y3);
 143     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 144     keying(x0, x1, x2, x3, key->subkeys[15]);
 145     RND15(x0, x1, x2, x3, y0, y1, y2, y3);
 146     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 147     keying(x0, x1, x2, x3, key->subkeys[16]);
 148     RND16(x0, x1, x2, x3, y0, y1, y2, y3);
 149     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 150     keying(x0, x1, x2, x3, key->subkeys[17]);
 151     RND17(x0, x1, x2, x3, y0, y1, y2, y3);
 152     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 153     keying(x0, x1, x2, x3, key->subkeys[18]);
 154     RND18(x0, x1, x2, x3, y0, y1, y2, y3);
 155     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 156     keying(x0, x1, x2, x3, key->subkeys[19]);
 157     RND19(x0, x1, x2, x3, y0, y1, y2, y3);
 158     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 159     keying(x0, x1, x2, x3, key->subkeys[20]);
 160     RND20(x0, x1, x2, x3, y0, y1, y2, y3);
 161     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 162     keying(x0, x1, x2, x3, key->subkeys[21]);
 163     RND21(x0, x1, x2, x3, y0, y1, y2, y3);
 164     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 165     keying(x0, x1, x2, x3, key->subkeys[22]);
 166     RND22(x0, x1, x2, x3, y0, y1, y2, y3);
 167     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 168     keying(x0, x1, x2, x3, key->subkeys[23]);
 169     RND23(x0, x1, x2, x3, y0, y1, y2, y3);
 170     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 171     keying(x0, x1, x2, x3, key->subkeys[24]);
 172     RND24(x0, x1, x2, x3, y0, y1, y2, y3);
 173     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 174     keying(x0, x1, x2, x3, key->subkeys[25]);
 175     RND25(x0, x1, x2, x3, y0, y1, y2, y3);
 176     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 177     keying(x0, x1, x2, x3, key->subkeys[26]);
 178     RND26(x0, x1, x2, x3, y0, y1, y2, y3);
 179     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 180     keying(x0, x1, x2, x3, key->subkeys[27]);
 181     RND27(x0, x1, x2, x3, y0, y1, y2, y3);
 182     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 183     keying(x0, x1, x2, x3, key->subkeys[28]);
 184     RND28(x0, x1, x2, x3, y0, y1, y2, y3);
 185     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 186     keying(x0, x1, x2, x3, key->subkeys[29]);
 187     RND29(x0, x1, x2, x3, y0, y1, y2, y3);
 188     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 189     keying(x0, x1, x2, x3, key->subkeys[30]);
 190     RND30(x0, x1, x2, x3, y0, y1, y2, y3);
 191     transform(y0, y1, y2, y3, x0, x1, x2, x3);
 192     keying(x0, x1, x2, x3, key->subkeys[31]);
 193     RND31(x0, x1, x2, x3, y0, y1, y2, y3);
 194     x0 = y0; x1 = y1; x2 = y2; x3 = y3;
 195     keying(x0, x1, x2, x3, key->subkeys[32]);
 196     /* The ciphertext is now in x */
 197
 198     ciphertext[0] = x0;
 199     ciphertext[1] = x1;
 200     ciphertext[2] = x2;
 201     ciphertext[3] = x3;
 202 }
 203
 204 void serpent_decrypt(struct keyInstance *key,
 205                      uint32_t ciphertext[4],
 206                      uint32_t plaintext[4])
 207 {
 208     register uint32_t x0, x1, x2, x3;
 209     register uint32_t y0, y1, y2, y3;
 210
 211     x0=ciphertext[0];
 212     x1=ciphertext[1];
 213     x2=ciphertext[2];
 214     x3=ciphertext[3];
 215
 216     /* Start to decrypt the ciphertext x */
 217     keying(x0, x1, x2, x3, key->subkeys[32]);
 218     InvRND31(x0, x1, x2, x3, y0, y1, y2, y3);
 219     keying(y0, y1, y2, y3, key->subkeys[31]);
 220     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 221     InvRND30(x0, x1, x2, x3, y0, y1, y2, y3);
 222     keying(y0, y1, y2, y3, key->subkeys[30]);
 223     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 224     InvRND29(x0, x1, x2, x3, y0, y1, y2, y3);
 225     keying(y0, y1, y2, y3, key->subkeys[29]);
 226     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 227     InvRND28(x0, x1, x2, x3, y0, y1, y2, y3);
 228     keying(y0, y1, y2, y3, key->subkeys[28]);
 229     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 230     InvRND27(x0, x1, x2, x3, y0, y1, y2, y3);
 231     keying(y0, y1, y2, y3, key->subkeys[27]);
 232     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 233     InvRND26(x0, x1, x2, x3, y0, y1, y2, y3);
 234     keying(y0, y1, y2, y3, key->subkeys[26]);
 235     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 236     InvRND25(x0, x1, x2, x3, y0, y1, y2, y3);
 237     keying(y0, y1, y2, y3, key->subkeys[25]);
 238     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 239     InvRND24(x0, x1, x2, x3, y0, y1, y2, y3);
 240     keying(y0, y1, y2, y3, key->subkeys[24]);
 241     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 242     InvRND23(x0, x1, x2, x3, y0, y1, y2, y3);
 243     keying(y0, y1, y2, y3, key->subkeys[23]);
 244     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 245     InvRND22(x0, x1, x2, x3, y0, y1, y2, y3);
 246     keying(y0, y1, y2, y3, key->subkeys[22]);
 247     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 248     InvRND21(x0, x1, x2, x3, y0, y1, y2, y3);
 249     keying(y0, y1, y2, y3, key->subkeys[21]);
 250     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 251     InvRND20(x0, x1, x2, x3, y0, y1, y2, y3);
 252     keying(y0, y1, y2, y3, key->subkeys[20]);
 253     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 254     InvRND19(x0, x1, x2, x3, y0, y1, y2, y3);
 255     keying(y0, y1, y2, y3, key->subkeys[19]);
 256     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 257     InvRND18(x0, x1, x2, x3, y0, y1, y2, y3);
 258     keying(y0, y1, y2, y3, key->subkeys[18]);
 259     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 260     InvRND17(x0, x1, x2, x3, y0, y1, y2, y3);
 261     keying(y0, y1, y2, y3, key->subkeys[17]);
 262     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 263     InvRND16(x0, x1, x2, x3, y0, y1, y2, y3);
 264     keying(y0, y1, y2, y3, key->subkeys[16]);
 265     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 266     InvRND15(x0, x1, x2, x3, y0, y1, y2, y3);
 267     keying(y0, y1, y2, y3, key->subkeys[15]);
 268     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 269     InvRND14(x0, x1, x2, x3, y0, y1, y2, y3);
 270     keying(y0, y1, y2, y3, key->subkeys[14]);
 271     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 272     InvRND13(x0, x1, x2, x3, y0, y1, y2, y3);
 273     keying(y0, y1, y2, y3, key->subkeys[13]);
 274     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 275     InvRND12(x0, x1, x2, x3, y0, y1, y2, y3);
 276     keying(y0, y1, y2, y3, key->subkeys[12]);
 277     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 278     InvRND11(x0, x1, x2, x3, y0, y1, y2, y3);
 279     keying(y0, y1, y2, y3, key->subkeys[11]);
 280     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 281     InvRND10(x0, x1, x2, x3, y0, y1, y2, y3);
 282     keying(y0, y1, y2, y3, key->subkeys[10]);
 283     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 284     InvRND09(x0, x1, x2, x3, y0, y1, y2, y3);
 285     keying(y0, y1, y2, y3, key->subkeys[ 9]);
 286     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 287     InvRND08(x0, x1, x2, x3, y0, y1, y2, y3);
 288     keying(y0, y1, y2, y3, key->subkeys[ 8]);
 289     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 290     InvRND07(x0, x1, x2, x3, y0, y1, y2, y3);
 291     keying(y0, y1, y2, y3, key->subkeys[ 7]);
 292     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 293     InvRND06(x0, x1, x2, x3, y0, y1, y2, y3);
 294     keying(y0, y1, y2, y3, key->subkeys[ 6]);
 295     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 296     InvRND05(x0, x1, x2, x3, y0, y1, y2, y3);
 297     keying(y0, y1, y2, y3, key->subkeys[ 5]);
 298     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 299     InvRND04(x0, x1, x2, x3, y0, y1, y2, y3);
 300     keying(y0, y1, y2, y3, key->subkeys[ 4]);
 301     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 302     InvRND03(x0, x1, x2, x3, y0, y1, y2, y3);
 303     keying(y0, y1, y2, y3, key->subkeys[ 3]);
 304     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 305     InvRND02(x0, x1, x2, x3, y0, y1, y2, y3);
 306     keying(y0, y1, y2, y3, key->subkeys[ 2]);
 307     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 308     InvRND01(x0, x1, x2, x3, y0, y1, y2, y3);
 309     keying(y0, y1, y2, y3, key->subkeys[ 1]);
 310     inv_transform(y0, y1, y2, y3, x0, x1, x2, x3);
 311     InvRND00(x0, x1, x2, x3, y0, y1, y2, y3);
 312     x0 = y0; x1 = y1; x2 = y2; x3 = y3;
 313     keying(x0, x1, x2, x3, key->subkeys[ 0]);
 314     /* The plaintext is now in x */
 315
 316     plaintext[0] = x0;
 317     plaintext[1] = x1;
 318     plaintext[2] = x2;
 319     plaintext[3] = x3;
 320 }