crypto/serpent.c

   1 /*
   2  * Cryptographic API.
   3  *
   4  * Serpent Cipher Algorithm.
   5  *
   6  * Copyright (C) 2002 Dag Arne Osvik <osvik@ii.uib.no>
   7  *               2003 Herbert Valerio Riedel <hvr@gnu.org>
   8  *
   9  * Added tnepres support: Ruben Jesus Garcia Hernandez <ruben@ugr.es>, 18.10.2004
  10  *               Based on code by hvr
  11  *
  12  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  */
  17
  18 #include <linux/init.h>
  19 #include <linux/module.h>
  20 #include <linux/errno.h>
  21 #include <asm/byteorder.h>
  22 #include <linux/crypto.h>
  23
  24 /* Key is padded to the maximum of 256 bits before round key generation.
  25  * Any key length <= 256 bits (32 bytes) is allowed by the algorithm.
  26  */
  27
  28 #define SERPENT_MIN_KEY_SIZE              0
  29 #define SERPENT_MAX_KEY_SIZE             32
  30 #define SERPENT_EXPKEY_WORDS            132
  31 #define SERPENT_BLOCK_SIZE               16
  32
  33 #define PHI 0x9e3779b9UL
  34
  35 #define keyiter(a,b,c,d,i,j) \
  36         b ^= d; b ^= c; b ^= a; b ^= PHI ^ i; b = rol32(b,11); k[j] = b;
  37
  38 #define loadkeys(x0,x1,x2,x3,i) \
  39         x0=k[i]; x1=k[i+1]; x2=k[i+2]; x3=k[i+3];
  40
  41 #define storekeys(x0,x1,x2,x3,i) \
  42         k[i]=x0; k[i+1]=x1; k[i+2]=x2; k[i+3]=x3;
  43
  44 #define K(x0,x1,x2,x3,i)                                \
  45         x3 ^= k[4*(i)+3];        x2 ^= k[4*(i)+2];      \
  46         x1 ^= k[4*(i)+1];        x0 ^= k[4*(i)+0];
  47
  48 #define LK(x0,x1,x2,x3,x4,i)                            \
  49                                         x0=rol32(x0,13);\
  50         x2=rol32(x2,3); x1 ^= x0;       x4  = x0 << 3;  \
  51         x3 ^= x2;       x1 ^= x2;                       \
  52         x1=rol32(x1,1); x3 ^= x4;                       \
  53         x3=rol32(x3,7); x4  = x1;                       \
  54         x0 ^= x1;       x4 <<= 7;       x2 ^= x3;       \
  55         x0 ^= x3;       x2 ^= x4;       x3 ^= k[4*i+3]; \
  56         x1 ^= k[4*i+1]; x0=rol32(x0,5); x2=rol32(x2,22);\
  57         x0 ^= k[4*i+0]; x2 ^= k[4*i+2];
  58
  59 #define KL(x0,x1,x2,x3,x4,i)                            \
  60         x0 ^= k[4*i+0]; x1 ^= k[4*i+1]; x2 ^= k[4*i+2]; \
  61         x3 ^= k[4*i+3]; x0=ror32(x0,5); x2=ror32(x2,22);\
  62         x4 =  x1;       x2 ^= x3;       x0 ^= x3;       \
  63         x4 <<= 7;       x0 ^= x1;       x1=ror32(x1,1); \
  64         x2 ^= x4;       x3=ror32(x3,7); x4 = x0 << 3;   \
  65         x1 ^= x0;       x3 ^= x4;       x0=ror32(x0,13);\
  66         x1 ^= x2;       x3 ^= x2;       x2=ror32(x2,3);
  67
  68 #define S0(x0,x1,x2,x3,x4)                              \
  69                                         x4  = x3;       \
  70         x3 |= x0;       x0 ^= x4;       x4 ^= x2;       \
  71         x4 =~ x4;       x3 ^= x1;       x1 &= x0;       \
  72         x1 ^= x4;       x2 ^= x0;       x0 ^= x3;       \
  73         x4 |= x0;       x0 ^= x2;       x2 &= x1;       \
  74         x3 ^= x2;       x1 =~ x1;       x2 ^= x4;       \
  75         x1 ^= x2;
  76
  77 #define S1(x0,x1,x2,x3,x4)                              \
  78                                         x4  = x1;       \
  79         x1 ^= x0;       x0 ^= x3;       x3 =~ x3;       \
  80         x4 &= x1;       x0 |= x1;       x3 ^= x2;       \
  81         x0 ^= x3;       x1 ^= x3;       x3 ^= x4;       \
  82         x1 |= x4;       x4 ^= x2;       x2 &= x0;       \
  83         x2 ^= x1;       x1 |= x0;       x0 =~ x0;       \
  84         x0 ^= x2;       x4 ^= x1;
  85
  86 #define S2(x0,x1,x2,x3,x4)                              \
  87                                         x3 =~ x3;       \
  88         x1 ^= x0;       x4  = x0;       x0 &= x2;       \
  89         x0 ^= x3;       x3 |= x4;       x2 ^= x1;       \
  90         x3 ^= x1;       x1 &= x0;       x0 ^= x2;       \
  91         x2 &= x3;       x3 |= x1;       x0 =~ x0;       \
  92         x3 ^= x0;       x4 ^= x0;       x0 ^= x2;       \
  93         x1 |= x2;
  94
  95 #define S3(x0,x1,x2,x3,x4)                              \
  96                                         x4  = x1;       \
  97         x1 ^= x3;       x3 |= x0;       x4 &= x0;       \
  98         x0 ^= x2;       x2 ^= x1;       x1 &= x3;       \
  99         x2 ^= x3;       x0 |= x4;       x4 ^= x3;       \
 100         x1 ^= x0;       x0 &= x3;       x3 &= x4;       \
 101         x3 ^= x2;       x4 |= x1;       x2 &= x1;       \
 102         x4 ^= x3;       x0 ^= x3;       x3 ^= x2;
 103
 104 #define S4(x0,x1,x2,x3,x4)                              \
 105                                         x4  = x3;       \
 106         x3 &= x0;       x0 ^= x4;                       \
 107         x3 ^= x2;       x2 |= x4;       x0 ^= x1;       \
 108         x4 ^= x3;       x2 |= x0;                       \
 109         x2 ^= x1;       x1 &= x0;                       \
 110         x1 ^= x4;       x4 &= x2;       x2 ^= x3;       \
 111         x4 ^= x0;       x3 |= x1;       x1 =~ x1;       \
 112         x3 ^= x0;
 113
 114 #define S5(x0,x1,x2,x3,x4)                              \
 115         x4  = x1;       x1 |= x0;                       \
 116         x2 ^= x1;       x3 =~ x3;       x4 ^= x0;       \
 117         x0 ^= x2;       x1 &= x4;       x4 |= x3;       \
 118         x4 ^= x0;       x0 &= x3;       x1 ^= x3;       \
 119         x3 ^= x2;       x0 ^= x1;       x2 &= x4;       \
 120         x1 ^= x2;       x2 &= x0;                       \
 121         x3 ^= x2;
 122
 123 #define S6(x0,x1,x2,x3,x4)                              \
 124                                         x4  = x1;       \
 125         x3 ^= x0;       x1 ^= x2;       x2 ^= x0;       \
 126         x0 &= x3;       x1 |= x3;       x4 =~ x4;       \
 127         x0 ^= x1;       x1 ^= x2;                       \
 128         x3 ^= x4;       x4 ^= x0;       x2 &= x0;       \
 129         x4 ^= x1;       x2 ^= x3;       x3 &= x1;       \
 130         x3 ^= x0;       x1 ^= x2;
 131
 132 #define S7(x0,x1,x2,x3,x4)                              \
 133                                         x1 =~ x1;       \
 134         x4  = x1;       x0 =~ x0;       x1 &= x2;       \
 135         x1 ^= x3;       x3 |= x4;       x4 ^= x2;       \
 136         x2 ^= x3;       x3 ^= x0;       x0 |= x1;       \
 137         x2 &= x0;       x0 ^= x4;       x4 ^= x3;       \
 138         x3 &= x0;       x4 ^= x1;                       \
 139         x2 ^= x4;       x3 ^= x1;       x4 |= x0;       \
 140         x4 ^= x1;
 141
 142 #define SI0(x0,x1,x2,x3,x4)                             \
 143                         x4  = x3;       x1 ^= x0;       \
 144         x3 |= x1;       x4 ^= x1;       x0 =~ x0;       \
 145         x2 ^= x3;       x3 ^= x0;       x0 &= x1;       \
 146         x0 ^= x2;       x2 &= x3;       x3 ^= x4;       \
 147         x2 ^= x3;       x1 ^= x3;       x3 &= x0;       \
 148         x1 ^= x0;       x0 ^= x2;       x4 ^= x3;
 149
 150 #define SI1(x0,x1,x2,x3,x4)                             \
 151         x1 ^= x3;       x4  = x0;                       \
 152         x0 ^= x2;       x2 =~ x2;       x4 |= x1;       \
 153         x4 ^= x3;       x3 &= x1;       x1 ^= x2;       \
 154         x2 &= x4;       x4 ^= x1;       x1 |= x3;       \
 155         x3 ^= x0;       x2 ^= x0;       x0 |= x4;       \
 156         x2 ^= x4;       x1 ^= x0;                       \
 157         x4 ^= x1;
 158
 159 #define SI2(x0,x1,x2,x3,x4)                             \
 160         x2 ^= x1;       x4  = x3;       x3 =~ x3;       \
 161         x3 |= x2;       x2 ^= x4;       x4 ^= x0;       \
 162         x3 ^= x1;       x1 |= x2;       x2 ^= x0;       \
 163         x1 ^= x4;       x4 |= x3;       x2 ^= x3;       \
 164         x4 ^= x2;       x2 &= x1;                       \
 165         x2 ^= x3;       x3 ^= x4;       x4 ^= x0;
 166
 167 #define SI3(x0,x1,x2,x3,x4)                             \
 168                                         x2 ^= x1;       \
 169         x4  = x1;       x1 &= x2;                       \
 170         x1 ^= x0;       x0 |= x4;       x4 ^= x3;       \
 171         x0 ^= x3;       x3 |= x1;       x1 ^= x2;       \
 172         x1 ^= x3;       x0 ^= x2;       x2 ^= x3;       \
 173         x3 &= x1;       x1 ^= x0;       x0 &= x2;       \
 174         x4 ^= x3;       x3 ^= x0;       x0 ^= x1;
 175
 176 #define SI4(x0,x1,x2,x3,x4)                             \
 177         x2 ^= x3;       x4  = x0;       x0 &= x1;       \
 178         x0 ^= x2;       x2 |= x3;       x4 =~ x4;       \
 179         x1 ^= x0;       x0 ^= x2;       x2 &= x4;       \
 180         x2 ^= x0;       x0 |= x4;                       \
 181         x0 ^= x3;       x3 &= x2;                       \
 182         x4 ^= x3;       x3 ^= x1;       x1 &= x0;       \
 183         x4 ^= x1;       x0 ^= x3;
 184
 185 #define SI5(x0,x1,x2,x3,x4)                             \
 186                         x4  = x1;       x1 |= x2;       \
 187         x2 ^= x4;       x1 ^= x3;       x3 &= x4;       \
 188         x2 ^= x3;       x3 |= x0;       x0 =~ x0;       \
 189         x3 ^= x2;       x2 |= x0;       x4 ^= x1;       \
 190         x2 ^= x4;       x4 &= x0;       x0 ^= x1;       \
 191         x1 ^= x3;       x0 &= x2;       x2 ^= x3;       \
 192         x0 ^= x2;       x2 ^= x4;       x4 ^= x3;
 193
 194 #define SI6(x0,x1,x2,x3,x4)                             \
 195                         x0 ^= x2;                       \
 196         x4  = x0;       x0 &= x3;       x2 ^= x3;       \
 197         x0 ^= x2;       x3 ^= x1;       x2 |= x4;       \
 198         x2 ^= x3;       x3 &= x0;       x0 =~ x0;       \
 199         x3 ^= x1;       x1 &= x2;       x4 ^= x0;       \
 200         x3 ^= x4;       x4 ^= x2;       x0 ^= x1;       \
 201         x2 ^= x0;
 202
 203 #define SI7(x0,x1,x2,x3,x4)                             \
 204         x4  = x3;       x3 &= x0;       x0 ^= x2;       \
 205         x2 |= x4;       x4 ^= x1;       x0 =~ x0;       \
 206         x1 |= x3;       x4 ^= x0;       x0 &= x2;       \
 207         x0 ^= x1;       x1 &= x2;       x3 ^= x2;       \
 208         x4 ^= x3;       x2 &= x3;       x3 |= x0;       \
 209         x1 ^= x4;       x3 ^= x4;       x4 &= x0;       \
 210         x4 ^= x2;
 211
 212 struct serpent_ctx {
 213         u32 expkey[SERPENT_EXPKEY_WORDS];
 214 };
 215
 216
 217 static int serpent_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
 218 {
 219         u32 *k = ((struct serpent_ctx *)ctx)->expkey;
 220         u8  *k8 = (u8 *)k;
 221         u32 r0,r1,r2,r3,r4;
 222         int i;
 223
 224         if ((keylen < SERPENT_MIN_KEY_SIZE)
 225                         || (keylen > SERPENT_MAX_KEY_SIZE))
 226         {
 227                 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 228                 return -EINVAL;
 229         }
 230
 231         /* Copy key, add padding */
 232
 233         for (i = 0; i < keylen; ++i)
 234                 k8[i] = key[i];
 235         if (i < SERPENT_MAX_KEY_SIZE)
 236                 k8[i++] = 1;
 237         while (i < SERPENT_MAX_KEY_SIZE)
 238                 k8[i++] = 0;
 239
 240         /* Expand key using polynomial */
 241
 242         r0 = le32_to_cpu(k[3]);
 243         r1 = le32_to_cpu(k[4]);
 244         r2 = le32_to_cpu(k[5]);
 245         r3 = le32_to_cpu(k[6]);
 246         r4 = le32_to_cpu(k[7]);
 247
 248         keyiter(le32_to_cpu(k[0]),r0,r4,r2,0,0);
 249         keyiter(le32_to_cpu(k[1]),r1,r0,r3,1,1);
 250         keyiter(le32_to_cpu(k[2]),r2,r1,r4,2,2);
 251         keyiter(le32_to_cpu(k[3]),r3,r2,r0,3,3);
 252         keyiter(le32_to_cpu(k[4]),r4,r3,r1,4,4);
 253         keyiter(le32_to_cpu(k[5]),r0,r4,r2,5,5);
 254         keyiter(le32_to_cpu(k[6]),r1,r0,r3,6,6);
 255         keyiter(le32_to_cpu(k[7]),r2,r1,r4,7,7);
 256
 257         keyiter(k[  0],r3,r2,r0,  8,  8); keyiter(k[  1],r4,r3,r1,  9,  9);
 258         keyiter(k[  2],r0,r4,r2, 10, 10); keyiter(k[  3],r1,r0,r3, 11, 11);
 259         keyiter(k[  4],r2,r1,r4, 12, 12); keyiter(k[  5],r3,r2,r0, 13, 13);
 260         keyiter(k[  6],r4,r3,r1, 14, 14); keyiter(k[  7],r0,r4,r2, 15, 15);
 261         keyiter(k[  8],r1,r0,r3, 16, 16); keyiter(k[  9],r2,r1,r4, 17, 17);
 262         keyiter(k[ 10],r3,r2,r0, 18, 18); keyiter(k[ 11],r4,r3,r1, 19, 19);
 263         keyiter(k[ 12],r0,r4,r2, 20, 20); keyiter(k[ 13],r1,r0,r3, 21, 21);
 264         keyiter(k[ 14],r2,r1,r4, 22, 22); keyiter(k[ 15],r3,r2,r0, 23, 23);
 265         keyiter(k[ 16],r4,r3,r1, 24, 24); keyiter(k[ 17],r0,r4,r2, 25, 25);
 266         keyiter(k[ 18],r1,r0,r3, 26, 26); keyiter(k[ 19],r2,r1,r4, 27, 27);
 267         keyiter(k[ 20],r3,r2,r0, 28, 28); keyiter(k[ 21],r4,r3,r1, 29, 29);
 268         keyiter(k[ 22],r0,r4,r2, 30, 30); keyiter(k[ 23],r1,r0,r3, 31, 31);
 269
 270         k += 50;
 271
 272         keyiter(k[-26],r2,r1,r4, 32,-18); keyiter(k[-25],r3,r2,r0, 33,-17);
 273         keyiter(k[-24],r4,r3,r1, 34,-16); keyiter(k[-23],r0,r4,r2, 35,-15);
 274         keyiter(k[-22],r1,r0,r3, 36,-14); keyiter(k[-21],r2,r1,r4, 37,-13);
 275         keyiter(k[-20],r3,r2,r0, 38,-12); keyiter(k[-19],r4,r3,r1, 39,-11);
 276         keyiter(k[-18],r0,r4,r2, 40,-10); keyiter(k[-17],r1,r0,r3, 41, -9);
 277         keyiter(k[-16],r2,r1,r4, 42, -8); keyiter(k[-15],r3,r2,r0, 43, -7);
 278         keyiter(k[-14],r4,r3,r1, 44, -6); keyiter(k[-13],r0,r4,r2, 45, -5);
 279         keyiter(k[-12],r1,r0,r3, 46, -4); keyiter(k[-11],r2,r1,r4, 47, -3);
 280         keyiter(k[-10],r3,r2,r0, 48, -2); keyiter(k[ -9],r4,r3,r1, 49, -1);
 281         keyiter(k[ -8],r0,r4,r2, 50,  0); keyiter(k[ -7],r1,r0,r3, 51,  1);
 282         keyiter(k[ -6],r2,r1,r4, 52,  2); keyiter(k[ -5],r3,r2,r0, 53,  3);
 283         keyiter(k[ -4],r4,r3,r1, 54,  4); keyiter(k[ -3],r0,r4,r2, 55,  5);
 284         keyiter(k[ -2],r1,r0,r3, 56,  6); keyiter(k[ -1],r2,r1,r4, 57,  7);
 285         keyiter(k[  0],r3,r2,r0, 58,  8); keyiter(k[  1],r4,r3,r1, 59,  9);
 286         keyiter(k[  2],r0,r4,r2, 60, 10); keyiter(k[  3],r1,r0,r3, 61, 11);
 287         keyiter(k[  4],r2,r1,r4, 62, 12); keyiter(k[  5],r3,r2,r0, 63, 13);
 288         keyiter(k[  6],r4,r3,r1, 64, 14); keyiter(k[  7],r0,r4,r2, 65, 15);
 289         keyiter(k[  8],r1,r0,r3, 66, 16); keyiter(k[  9],r2,r1,r4, 67, 17);
 290         keyiter(k[ 10],r3,r2,r0, 68, 18); keyiter(k[ 11],r4,r3,r1, 69, 19);
 291         keyiter(k[ 12],r0,r4,r2, 70, 20); keyiter(k[ 13],r1,r0,r3, 71, 21);
 292         keyiter(k[ 14],r2,r1,r4, 72, 22); keyiter(k[ 15],r3,r2,r0, 73, 23);
 293         keyiter(k[ 16],r4,r3,r1, 74, 24); keyiter(k[ 17],r0,r4,r2, 75, 25);
 294         keyiter(k[ 18],r1,r0,r3, 76, 26); keyiter(k[ 19],r2,r1,r4, 77, 27);
 295         keyiter(k[ 20],r3,r2,r0, 78, 28); keyiter(k[ 21],r4,r3,r1, 79, 29);
 296         keyiter(k[ 22],r0,r4,r2, 80, 30); keyiter(k[ 23],r1,r0,r3, 81, 31);
 297
 298         k += 50;
 299
 300         keyiter(k[-26],r2,r1,r4, 82,-18); keyiter(k[-25],r3,r2,r0, 83,-17);
 301         keyiter(k[-24],r4,r3,r1, 84,-16); keyiter(k[-23],r0,r4,r2, 85,-15);
 302         keyiter(k[-22],r1,r0,r3, 86,-14); keyiter(k[-21],r2,r1,r4, 87,-13);
 303         keyiter(k[-20],r3,r2,r0, 88,-12); keyiter(k[-19],r4,r3,r1, 89,-11);
 304         keyiter(k[-18],r0,r4,r2, 90,-10); keyiter(k[-17],r1,r0,r3, 91, -9);
 305         keyiter(k[-16],r2,r1,r4, 92, -8); keyiter(k[-15],r3,r2,r0, 93, -7);
 306         keyiter(k[-14],r4,r3,r1, 94, -6); keyiter(k[-13],r0,r4,r2, 95, -5);
 307         keyiter(k[-12],r1,r0,r3, 96, -4); keyiter(k[-11],r2,r1,r4, 97, -3);
 308         keyiter(k[-10],r3,r2,r0, 98, -2); keyiter(k[ -9],r4,r3,r1, 99, -1);
 309         keyiter(k[ -8],r0,r4,r2,100,  0); keyiter(k[ -7],r1,r0,r3,101,  1);
 310         keyiter(k[ -6],r2,r1,r4,102,  2); keyiter(k[ -5],r3,r2,r0,103,  3);
 311         keyiter(k[ -4],r4,r3,r1,104,  4); keyiter(k[ -3],r0,r4,r2,105,  5);
 312         keyiter(k[ -2],r1,r0,r3,106,  6); keyiter(k[ -1],r2,r1,r4,107,  7);
 313         keyiter(k[  0],r3,r2,r0,108,  8); keyiter(k[  1],r4,r3,r1,109,  9);
 314         keyiter(k[  2],r0,r4,r2,110, 10); keyiter(k[  3],r1,r0,r3,111, 11);
 315         keyiter(k[  4],r2,r1,r4,112, 12); keyiter(k[  5],r3,r2,r0,113, 13);
 316         keyiter(k[  6],r4,r3,r1,114, 14); keyiter(k[  7],r0,r4,r2,115, 15);
 317         keyiter(k[  8],r1,r0,r3,116, 16); keyiter(k[  9],r2,r1,r4,117, 17);
 318         keyiter(k[ 10],r3,r2,r0,118, 18); keyiter(k[ 11],r4,r3,r1,119, 19);
 319         keyiter(k[ 12],r0,r4,r2,120, 20); keyiter(k[ 13],r1,r0,r3,121, 21);
 320         keyiter(k[ 14],r2,r1,r4,122, 22); keyiter(k[ 15],r3,r2,r0,123, 23);
 321         keyiter(k[ 16],r4,r3,r1,124, 24); keyiter(k[ 17],r0,r4,r2,125, 25);
 322         keyiter(k[ 18],r1,r0,r3,126, 26); keyiter(k[ 19],r2,r1,r4,127, 27);
 323         keyiter(k[ 20],r3,r2,r0,128, 28); keyiter(k[ 21],r4,r3,r1,129, 29);
 324         keyiter(k[ 22],r0,r4,r2,130, 30); keyiter(k[ 23],r1,r0,r3,131, 31);
 325
 326         /* Apply S-boxes */
 327
 328         S3(r3,r4,r0,r1,r2); storekeys(r1,r2,r4,r3, 28); loadkeys(r1,r2,r4,r3, 24);
 329         S4(r1,r2,r4,r3,r0); storekeys(r2,r4,r3,r0, 24); loadkeys(r2,r4,r3,r0, 20);
 330         S5(r2,r4,r3,r0,r1); storekeys(r1,r2,r4,r0, 20); loadkeys(r1,r2,r4,r0, 16);
 331         S6(r1,r2,r4,r0,r3); storekeys(r4,r3,r2,r0, 16); loadkeys(r4,r3,r2,r0, 12);
 332         S7(r4,r3,r2,r0,r1); storekeys(r1,r2,r0,r4, 12); loadkeys(r1,r2,r0,r4,  8);
 333         S0(r1,r2,r0,r4,r3); storekeys(r0,r2,r4,r1,  8); loadkeys(r0,r2,r4,r1,  4);
 334         S1(r0,r2,r4,r1,r3); storekeys(r3,r4,r1,r0,  4); loadkeys(r3,r4,r1,r0,  0);
 335         S2(r3,r4,r1,r0,r2); storekeys(r2,r4,r3,r0,  0); loadkeys(r2,r4,r3,r0, -4);
 336         S3(r2,r4,r3,r0,r1); storekeys(r0,r1,r4,r2, -4); loadkeys(r0,r1,r4,r2, -8);
 337         S4(r0,r1,r4,r2,r3); storekeys(r1,r4,r2,r3, -8); loadkeys(r1,r4,r2,r3,-12);
 338         S5(r1,r4,r2,r3,r0); storekeys(r0,r1,r4,r3,-12); loadkeys(r0,r1,r4,r3,-16);
 339         S6(r0,r1,r4,r3,r2); storekeys(r4,r2,r1,r3,-16); loadkeys(r4,r2,r1,r3,-20);
 340         S7(r4,r2,r1,r3,r0); storekeys(r0,r1,r3,r4,-20); loadkeys(r0,r1,r3,r4,-24);
 341         S0(r0,r1,r3,r4,r2); storekeys(r3,r1,r4,r0,-24); loadkeys(r3,r1,r4,r0,-28);
 342         k -= 50;
 343         S1(r3,r1,r4,r0,r2); storekeys(r2,r4,r0,r3, 22); loadkeys(r2,r4,r0,r3, 18);
 344         S2(r2,r4,r0,r3,r1); storekeys(r1,r4,r2,r3, 18); loadkeys(r1,r4,r2,r3, 14);
 345         S3(r1,r4,r2,r3,r0); storekeys(r3,r0,r4,r1, 14); loadkeys(r3,r0,r4,r1, 10);
 346         S4(r3,r0,r4,r1,r2); storekeys(r0,r4,r1,r2, 10); loadkeys(r0,r4,r1,r2,  6);
 347         S5(r0,r4,r1,r2,r3); storekeys(r3,r0,r4,r2,  6); loadkeys(r3,r0,r4,r2,  2);
 348         S6(r3,r0,r4,r2,r1); storekeys(r4,r1,r0,r2,  2); loadkeys(r4,r1,r0,r2, -2);
 349         S7(r4,r1,r0,r2,r3); storekeys(r3,r0,r2,r4, -2); loadkeys(r3,r0,r2,r4, -6);
 350         S0(r3,r0,r2,r4,r1); storekeys(r2,r0,r4,r3, -6); loadkeys(r2,r0,r4,r3,-10);
 351         S1(r2,r0,r4,r3,r1); storekeys(r1,r4,r3,r2,-10); loadkeys(r1,r4,r3,r2,-14);
 352         S2(r1,r4,r3,r2,r0); storekeys(r0,r4,r1,r2,-14); loadkeys(r0,r4,r1,r2,-18);
 353         S3(r0,r4,r1,r2,r3); storekeys(r2,r3,r4,r0,-18); loadkeys(r2,r3,r4,r0,-22);
 354         k -= 50;
 355         S4(r2,r3,r4,r0,r1); storekeys(r3,r4,r0,r1, 28); loadkeys(r3,r4,r0,r1, 24);
 356         S5(r3,r4,r0,r1,r2); storekeys(r2,r3,r4,r1, 24); loadkeys(r2,r3,r4,r1, 20);
 357         S6(r2,r3,r4,r1,r0); storekeys(r4,r0,r3,r1, 20); loadkeys(r4,r0,r3,r1, 16);
 358         S7(r4,r0,r3,r1,r2); storekeys(r2,r3,r1,r4, 16); loadkeys(r2,r3,r1,r4, 12);
 359         S0(r2,r3,r1,r4,r0); storekeys(r1,r3,r4,r2, 12); loadkeys(r1,r3,r4,r2,  8);
 360         S1(r1,r3,r4,r2,r0); storekeys(r0,r4,r2,r1,  8); loadkeys(r0,r4,r2,r1,  4);
 361         S2(r0,r4,r2,r1,r3); storekeys(r3,r4,r0,r1,  4); loadkeys(r3,r4,r0,r1,  0);
 362         S3(r3,r4,r0,r1,r2); storekeys(r1,r2,r4,r3,  0);
 363
 364         return 0;
 365 }
 366
 367 static void serpent_encrypt(void *ctx, u8 *dst, const u8 *src)
 368 {
 369         const u32
 370                 *k = ((struct serpent_ctx *)ctx)->expkey,
 371                 *s = (const u32 *)src;
 372         u32     *d = (u32 *)dst,
 373                 r0, r1, r2, r3, r4;
 374
 375 /*
 376  * Note: The conversions between u8* and u32* might cause trouble
 377  * on architectures with stricter alignment rules than x86
 378  */
 379
 380         r0 = le32_to_cpu(s[0]);
 381         r1 = le32_to_cpu(s[1]);
 382         r2 = le32_to_cpu(s[2]);
 383         r3 = le32_to_cpu(s[3]);
 384
 385                                  K(r0,r1,r2,r3,0);
 386         S0(r0,r1,r2,r3,r4);     LK(r2,r1,r3,r0,r4,1);
 387         S1(r2,r1,r3,r0,r4);     LK(r4,r3,r0,r2,r1,2);
 388         S2(r4,r3,r0,r2,r1);     LK(r1,r3,r4,r2,r0,3);
 389         S3(r1,r3,r4,r2,r0);     LK(r2,r0,r3,r1,r4,4);
 390         S4(r2,r0,r3,r1,r4);     LK(r0,r3,r1,r4,r2,5);
 391         S5(r0,r3,r1,r4,r2);     LK(r2,r0,r3,r4,r1,6);
 392         S6(r2,r0,r3,r4,r1);     LK(r3,r1,r0,r4,r2,7);
 393         S7(r3,r1,r0,r4,r2);     LK(r2,r0,r4,r3,r1,8);
 394         S0(r2,r0,r4,r3,r1);     LK(r4,r0,r3,r2,r1,9);
 395         S1(r4,r0,r3,r2,r1);     LK(r1,r3,r2,r4,r0,10);
 396         S2(r1,r3,r2,r4,r0);     LK(r0,r3,r1,r4,r2,11);
 397         S3(r0,r3,r1,r4,r2);     LK(r4,r2,r3,r0,r1,12);
 398         S4(r4,r2,r3,r0,r1);     LK(r2,r3,r0,r1,r4,13);
 399         S5(r2,r3,r0,r1,r4);     LK(r4,r2,r3,r1,r0,14);
 400         S6(r4,r2,r3,r1,r0);     LK(r3,r0,r2,r1,r4,15);
 401         S7(r3,r0,r2,r1,r4);     LK(r4,r2,r1,r3,r0,16);
 402         S0(r4,r2,r1,r3,r0);     LK(r1,r2,r3,r4,r0,17);
 403         S1(r1,r2,r3,r4,r0);     LK(r0,r3,r4,r1,r2,18);
 404         S2(r0,r3,r4,r1,r2);     LK(r2,r3,r0,r1,r4,19);
 405         S3(r2,r3,r0,r1,r4);     LK(r1,r4,r3,r2,r0,20);
 406         S4(r1,r4,r3,r2,r0);     LK(r4,r3,r2,r0,r1,21);
 407         S5(r4,r3,r2,r0,r1);     LK(r1,r4,r3,r0,r2,22);
 408         S6(r1,r4,r3,r0,r2);     LK(r3,r2,r4,r0,r1,23);
 409         S7(r3,r2,r4,r0,r1);     LK(r1,r4,r0,r3,r2,24);
 410         S0(r1,r4,r0,r3,r2);     LK(r0,r4,r3,r1,r2,25);
 411         S1(r0,r4,r3,r1,r2);     LK(r2,r3,r1,r0,r4,26);
 412         S2(r2,r3,r1,r0,r4);     LK(r4,r3,r2,r0,r1,27);
 413         S3(r4,r3,r2,r0,r1);     LK(r0,r1,r3,r4,r2,28);
 414         S4(r0,r1,r3,r4,r2);     LK(r1,r3,r4,r2,r0,29);
 415         S5(r1,r3,r4,r2,r0);     LK(r0,r1,r3,r2,r4,30);
 416         S6(r0,r1,r3,r2,r4);     LK(r3,r4,r1,r2,r0,31);
 417         S7(r3,r4,r1,r2,r0);      K(r0,r1,r2,r3,32);
 418
 419         d[0] = cpu_to_le32(r0);
 420         d[1] = cpu_to_le32(r1);
 421         d[2] = cpu_to_le32(r2);
 422         d[3] = cpu_to_le32(r3);
 423 }
 424
 425 static void serpent_decrypt(void *ctx, u8 *dst, const u8 *src)
 426 {
 427         const u32
 428                 *k = ((struct serpent_ctx *)ctx)->expkey,
 429                 *s = (const u32 *)src;
 430         u32     *d = (u32 *)dst,
 431                 r0, r1, r2, r3, r4;
 432
 433         r0 = le32_to_cpu(s[0]);
 434         r1 = le32_to_cpu(s[1]);
 435         r2 = le32_to_cpu(s[2]);
 436         r3 = le32_to_cpu(s[3]);
 437
 438                                 K(r0,r1,r2,r3,32);
 439         SI7(r0,r1,r2,r3,r4);    KL(r1,r3,r0,r4,r2,31);
 440         SI6(r1,r3,r0,r4,r2);    KL(r0,r2,r4,r1,r3,30);
 441         SI5(r0,r2,r4,r1,r3);    KL(r2,r3,r0,r4,r1,29);
 442         SI4(r2,r3,r0,r4,r1);    KL(r2,r0,r1,r4,r3,28);
 443         SI3(r2,r0,r1,r4,r3);    KL(r1,r2,r3,r4,r0,27);
 444         SI2(r1,r2,r3,r4,r0);    KL(r2,r0,r4,r3,r1,26);
 445         SI1(r2,r0,r4,r3,r1);    KL(r1,r0,r4,r3,r2,25);
 446         SI0(r1,r0,r4,r3,r2);    KL(r4,r2,r0,r1,r3,24);
 447         SI7(r4,r2,r0,r1,r3);    KL(r2,r1,r4,r3,r0,23);
 448         SI6(r2,r1,r4,r3,r0);    KL(r4,r0,r3,r2,r1,22);
 449         SI5(r4,r0,r3,r2,r1);    KL(r0,r1,r4,r3,r2,21);
 450         SI4(r0,r1,r4,r3,r2);    KL(r0,r4,r2,r3,r1,20);
 451         SI3(r0,r4,r2,r3,r1);    KL(r2,r0,r1,r3,r4,19);
 452         SI2(r2,r0,r1,r3,r4);    KL(r0,r4,r3,r1,r2,18);
 453         SI1(r0,r4,r3,r1,r2);    KL(r2,r4,r3,r1,r0,17);
 454         SI0(r2,r4,r3,r1,r0);    KL(r3,r0,r4,r2,r1,16);
 455         SI7(r3,r0,r4,r2,r1);    KL(r0,r2,r3,r1,r4,15);
 456         SI6(r0,r2,r3,r1,r4);    KL(r3,r4,r1,r0,r2,14);
 457         SI5(r3,r4,r1,r0,r2);    KL(r4,r2,r3,r1,r0,13);
 458         SI4(r4,r2,r3,r1,r0);    KL(r4,r3,r0,r1,r2,12);
 459         SI3(r4,r3,r0,r1,r2);    KL(r0,r4,r2,r1,r3,11);
 460         SI2(r0,r4,r2,r1,r3);    KL(r4,r3,r1,r2,r0,10);
 461         SI1(r4,r3,r1,r2,r0);    KL(r0,r3,r1,r2,r4,9);
 462         SI0(r0,r3,r1,r2,r4);    KL(r1,r4,r3,r0,r2,8);
 463         SI7(r1,r4,r3,r0,r2);    KL(r4,r0,r1,r2,r3,7);
 464         SI6(r4,r0,r1,r2,r3);    KL(r1,r3,r2,r4,r0,6);
 465         SI5(r1,r3,r2,r4,r0);    KL(r3,r0,r1,r2,r4,5);
 466         SI4(r3,r0,r1,r2,r4);    KL(r3,r1,r4,r2,r0,4);
 467         SI3(r3,r1,r4,r2,r0);    KL(r4,r3,r0,r2,r1,3);
 468         SI2(r4,r3,r0,r2,r1);    KL(r3,r1,r2,r0,r4,2);
 469         SI1(r3,r1,r2,r0,r4);    KL(r4,r1,r2,r0,r3,1);
 470         SI0(r4,r1,r2,r0,r3);    K(r2,r3,r1,r4,0);
 471
 472         d[0] = cpu_to_le32(r2);
 473         d[1] = cpu_to_le32(r3);
 474         d[2] = cpu_to_le32(r1);
 475         d[3] = cpu_to_le32(r4);
 476 }
 477
 478 static struct crypto_alg serpent_alg = {
 479         .cra_name               =       "serpent",
 480         .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,
 481         .cra_blocksize          =       SERPENT_BLOCK_SIZE,
 482         .cra_ctxsize            =       sizeof(struct serpent_ctx),
 483         .cra_module             =       THIS_MODULE,
 484         .cra_list               =       LIST_HEAD_INIT(serpent_alg.cra_list),
 485         .cra_u                  =       { .cipher = {
 486         .cia_min_keysize        =       SERPENT_MIN_KEY_SIZE,
 487         .cia_max_keysize        =       SERPENT_MAX_KEY_SIZE,
 488         .cia_setkey             =       serpent_setkey,
 489         .cia_encrypt            =       serpent_encrypt,
 490         .cia_decrypt            =       serpent_decrypt } }
 491 };
 492
 493 static int tnepres_setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags)
 494 {
 495         u8 rev_key[SERPENT_MAX_KEY_SIZE];
 496         int i;
 497
 498         if ((keylen < SERPENT_MIN_KEY_SIZE)
 499             || (keylen > SERPENT_MAX_KEY_SIZE)) {
 500                 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
 501                 return -EINVAL;
 502         }
 503
 504         for (i = 0; i < keylen; ++i)
 505                 rev_key[keylen - i - 1] = key[i];
 506
 507         return serpent_setkey(ctx, rev_key, keylen, flags);
 508 }
 509
 510 static void tnepres_encrypt(void *ctx, u8 *dst, const u8 *src)
 511 {
 512         const u32 * const s = (const u32 * const)src;
 513         u32 * const d = (u32 * const)dst;
 514
 515         u32 rs[4], rd[4];
 516
 517         rs[0] = swab32(s[3]);
 518         rs[1] = swab32(s[2]);
 519         rs[2] = swab32(s[1]);
 520         rs[3] = swab32(s[0]);
 521
 522         serpent_encrypt(ctx, (u8 *)rd, (u8 *)rs);
 523
 524         d[0] = swab32(rd[3]);
 525         d[1] = swab32(rd[2]);
 526         d[2] = swab32(rd[1]);
 527         d[3] = swab32(rd[0]);
 528 }
 529
 530 static void tnepres_decrypt(void *ctx, u8 *dst, const u8 *src)
 531 {
 532         const u32 * const s = (const u32 * const)src;
 533         u32 * const d = (u32 * const)dst;
 534
 535         u32 rs[4], rd[4];
 536
 537         rs[0] = swab32(s[3]);
 538         rs[1] = swab32(s[2]);
 539         rs[2] = swab32(s[1]);
 540         rs[3] = swab32(s[0]);
 541
 542         serpent_decrypt(ctx, (u8 *)rd, (u8 *)rs);
 543
 544         d[0] = swab32(rd[3]);
 545         d[1] = swab32(rd[2]);
 546         d[2] = swab32(rd[1]);
 547         d[3] = swab32(rd[0]);
 548 }
 549
 550 static struct crypto_alg tnepres_alg = {
 551         .cra_name               =       "tnepres",
 552         .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,
 553         .cra_blocksize          =       SERPENT_BLOCK_SIZE,
 554         .cra_ctxsize            =       sizeof(struct serpent_ctx),
 555         .cra_module             =       THIS_MODULE,
 556         .cra_list               =       LIST_HEAD_INIT(serpent_alg.cra_list),
 557         .cra_u                  =       { .cipher = {
 558         .cia_min_keysize        =       SERPENT_MIN_KEY_SIZE,
 559         .cia_max_keysize        =       SERPENT_MAX_KEY_SIZE,
 560         .cia_setkey             =       tnepres_setkey,
 561         .cia_encrypt            =       tnepres_encrypt,
 562         .cia_decrypt            =       tnepres_decrypt } }
 563 };
 564
 565 static int __init init(void)
 566 {
 567         int ret = crypto_register_alg(&serpent_alg);
 568
 569         if (ret)
 570                 return ret;
 571
 572         ret = crypto_register_alg(&tnepres_alg);
 573
 574         if (ret)
 575                 crypto_unregister_alg(&serpent_alg);
 576
 577         return ret;
 578 }
 579
 580 static void __exit fini(void)
 581 {
 582         crypto_unregister_alg(&tnepres_alg);
 583         crypto_unregister_alg(&serpent_alg);
 584 }
 585
 586 module_init(init);
 587 module_exit(fini);
 588
 589 MODULE_LICENSE("GPL");
 590 MODULE_DESCRIPTION("Serpent and tnepres (kerneli compatible serpent reversed) Cipher Algorithm");
 591 MODULE_AUTHOR("Dag Arne Osvik <osvik@ii.uib.no>");
 592 MODULE_ALIAS("tnepres");