crypto/serpent_generic.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Cryptographic API.
   4  *
   5  * Serpent Cipher Algorithm.
   6  *
   7  * Copyright (C) 2002 Dag Arne Osvik <osvik@ii.uib.no>
   8  */
   9
  10 #include <crypto/algapi.h>
  11 #include <linux/init.h>
  12 #include <linux/module.h>
  13 #include <linux/errno.h>
  14 #include <linux/unaligned.h>
  15 #include <linux/types.h>
  16 #include <crypto/serpent.h>
  17
  18 /* Key is padded to the maximum of 256 bits before round key generation.
  19  * Any key length <= 256 bits (32 bytes) is allowed by the algorithm.
  20  */
  21
  22 #define PHI 0x9e3779b9UL
  23
  24 #define keyiter(a, b, c, d, i, j) \
  25         ({ b ^= d; b ^= c; b ^= a; b ^= PHI ^ i; b = rol32(b, 11); k[j] = b; })
  26
  27 #define loadkeys(x0, x1, x2, x3, i) \
  28         ({ x0 = k[i]; x1 = k[i+1]; x2 = k[i+2]; x3 = k[i+3]; })
  29
  30 #define storekeys(x0, x1, x2, x3, i) \
  31         ({ k[i] = x0; k[i+1] = x1; k[i+2] = x2; k[i+3] = x3; })
  32
  33 #define store_and_load_keys(x0, x1, x2, x3, s, l) \
  34         ({ storekeys(x0, x1, x2, x3, s); loadkeys(x0, x1, x2, x3, l); })
  35
  36 #define K(x0, x1, x2, x3, i) ({                         \
  37         x3 ^= k[4*(i)+3];        x2 ^= k[4*(i)+2];      \
  38         x1 ^= k[4*(i)+1];        x0 ^= k[4*(i)+0];      \
  39         })
  40
  41 #define LK(x0, x1, x2, x3, x4, i) ({                                       \
  42                                                         x0 = rol32(x0, 13);\
  43         x2 = rol32(x2, 3);      x1 ^= x0;               x4  = x0 << 3;     \
  44         x3 ^= x2;               x1 ^= x2;                                  \
  45         x1 = rol32(x1, 1);      x3 ^= x4;                                  \
  46         x3 = rol32(x3, 7);      x4  = x1;                                  \
  47         x0 ^= x1;               x4 <<= 7;               x2 ^= x3;          \
  48         x0 ^= x3;               x2 ^= x4;               x3 ^= k[4*i+3];    \
  49         x1 ^= k[4*i+1];         x0 = rol32(x0, 5);      x2 = rol32(x2, 22);\
  50         x0 ^= k[4*i+0];         x2 ^= k[4*i+2];                            \
  51         })
  52
  53 #define KL(x0, x1, x2, x3, x4, i) ({                                       \
  54         x0 ^= k[4*i+0];         x1 ^= k[4*i+1];         x2 ^= k[4*i+2];    \
  55         x3 ^= k[4*i+3];         x0 = ror32(x0, 5);      x2 = ror32(x2, 22);\
  56         x4 =  x1;               x2 ^= x3;               x0 ^= x3;          \
  57         x4 <<= 7;               x0 ^= x1;               x1 = ror32(x1, 1); \
  58         x2 ^= x4;               x3 = ror32(x3, 7);      x4 = x0 << 3;      \
  59         x1 ^= x0;               x3 ^= x4;               x0 = ror32(x0, 13);\
  60         x1 ^= x2;               x3 ^= x2;               x2 = ror32(x2, 3); \
  61         })
  62
  63 #define S0(x0, x1, x2, x3, x4) ({                       \
  64                                         x4  = x3;       \
  65         x3 |= x0;       x0 ^= x4;       x4 ^= x2;       \
  66         x4 = ~x4;       x3 ^= x1;       x1 &= x0;       \
  67         x1 ^= x4;       x2 ^= x0;       x0 ^= x3;       \
  68         x4 |= x0;       x0 ^= x2;       x2 &= x1;       \
  69         x3 ^= x2;       x1 = ~x1;       x2 ^= x4;       \
  70         x1 ^= x2;                                       \
  71         })
  72
  73 #define S1(x0, x1, x2, x3, x4) ({                       \
  74                                         x4  = x1;       \
  75         x1 ^= x0;       x0 ^= x3;       x3 = ~x3;       \
  76         x4 &= x1;       x0 |= x1;       x3 ^= x2;       \
  77         x0 ^= x3;       x1 ^= x3;       x3 ^= x4;       \
  78         x1 |= x4;       x4 ^= x2;       x2 &= x0;       \
  79         x2 ^= x1;       x1 |= x0;       x0 = ~x0;       \
  80         x0 ^= x2;       x4 ^= x1;                       \
  81         })
  82
  83 #define S2(x0, x1, x2, x3, x4) ({                       \
  84                                         x3 = ~x3;       \
  85         x1 ^= x0;       x4  = x0;       x0 &= x2;       \
  86         x0 ^= x3;       x3 |= x4;       x2 ^= x1;       \
  87         x3 ^= x1;       x1 &= x0;       x0 ^= x2;       \
  88         x2 &= x3;       x3 |= x1;       x0 = ~x0;       \
  89         x3 ^= x0;       x4 ^= x0;       x0 ^= x2;       \
  90         x1 |= x2;                                       \
  91         })
  92
  93 #define S3(x0, x1, x2, x3, x4) ({                       \
  94                                         x4  = x1;       \
  95         x1 ^= x3;       x3 |= x0;       x4 &= x0;       \
  96         x0 ^= x2;       x2 ^= x1;       x1 &= x3;       \
  97         x2 ^= x3;       x0 |= x4;       x4 ^= x3;       \
  98         x1 ^= x0;       x0 &= x3;       x3 &= x4;       \
  99         x3 ^= x2;       x4 |= x1;       x2 &= x1;       \
 100         x4 ^= x3;       x0 ^= x3;       x3 ^= x2;       \
 101         })
 102
 103 #define S4(x0, x1, x2, x3, x4) ({                       \
 104                                         x4  = x3;       \
 105         x3 &= x0;       x0 ^= x4;                       \
 106         x3 ^= x2;       x2 |= x4;       x0 ^= x1;       \
 107         x4 ^= x3;       x2 |= x0;                       \
 108         x2 ^= x1;       x1 &= x0;                       \
 109         x1 ^= x4;       x4 &= x2;       x2 ^= x3;       \
 110         x4 ^= x0;       x3 |= x1;       x1 = ~x1;       \
 111         x3 ^= x0;                                       \
 112         })
 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
 124 #define S6(x0, x1, x2, x3, x4) ({                       \
 125                                         x4  = x1;       \
 126         x3 ^= x0;       x1 ^= x2;       x2 ^= x0;       \
 127         x0 &= x3;       x1 |= x3;       x4 = ~x4;       \
 128         x0 ^= x1;       x1 ^= x2;                       \
 129         x3 ^= x4;       x4 ^= x0;       x2 &= x0;       \
 130         x4 ^= x1;       x2 ^= x3;       x3 &= x1;       \
 131         x3 ^= x0;       x1 ^= x2;                       \
 132         })
 133
 134 #define S7(x0, x1, x2, x3, x4) ({                       \
 135                                         x1 = ~x1;       \
 136         x4  = x1;       x0 = ~x0;       x1 &= x2;       \
 137         x1 ^= x3;       x3 |= x4;       x4 ^= x2;       \
 138         x2 ^= x3;       x3 ^= x0;       x0 |= x1;       \
 139         x2 &= x0;       x0 ^= x4;       x4 ^= x3;       \
 140         x3 &= x0;       x4 ^= x1;                       \
 141         x2 ^= x4;       x3 ^= x1;       x4 |= x0;       \
 142         x4 ^= x1;                                       \
 143         })
 144
 145 #define SI0(x0, x1, x2, x3, x4) ({                      \
 146                         x4  = x3;       x1 ^= x0;       \
 147         x3 |= x1;       x4 ^= x1;       x0 = ~x0;       \
 148         x2 ^= x3;       x3 ^= x0;       x0 &= x1;       \
 149         x0 ^= x2;       x2 &= x3;       x3 ^= x4;       \
 150         x2 ^= x3;       x1 ^= x3;       x3 &= x0;       \
 151         x1 ^= x0;       x0 ^= x2;       x4 ^= x3;       \
 152         })
 153
 154 #define SI1(x0, x1, x2, x3, x4) ({                      \
 155         x1 ^= x3;       x4  = x0;                       \
 156         x0 ^= x2;       x2 = ~x2;       x4 |= x1;       \
 157         x4 ^= x3;       x3 &= x1;       x1 ^= x2;       \
 158         x2 &= x4;       x4 ^= x1;       x1 |= x3;       \
 159         x3 ^= x0;       x2 ^= x0;       x0 |= x4;       \
 160         x2 ^= x4;       x1 ^= x0;                       \
 161         x4 ^= x1;                                       \
 162         })
 163
 164 #define SI2(x0, x1, x2, x3, x4) ({                      \
 165         x2 ^= x1;       x4  = x3;       x3 = ~x3;       \
 166         x3 |= x2;       x2 ^= x4;       x4 ^= x0;       \
 167         x3 ^= x1;       x1 |= x2;       x2 ^= x0;       \
 168         x1 ^= x4;       x4 |= x3;       x2 ^= x3;       \
 169         x4 ^= x2;       x2 &= x1;                       \
 170         x2 ^= x3;       x3 ^= x4;       x4 ^= x0;       \
 171         })
 172
 173 #define SI3(x0, x1, x2, x3, x4) ({                      \
 174                                         x2 ^= x1;       \
 175         x4  = x1;       x1 &= x2;                       \
 176         x1 ^= x0;       x0 |= x4;       x4 ^= x3;       \
 177         x0 ^= x3;       x3 |= x1;       x1 ^= x2;       \
 178         x1 ^= x3;       x0 ^= x2;       x2 ^= x3;       \
 179         x3 &= x1;       x1 ^= x0;       x0 &= x2;       \
 180         x4 ^= x3;       x3 ^= x0;       x0 ^= x1;       \
 181         })
 182
 183 #define SI4(x0, x1, x2, x3, x4) ({                      \
 184         x2 ^= x3;       x4  = x0;       x0 &= x1;       \
 185         x0 ^= x2;       x2 |= x3;       x4 = ~x4;       \
 186         x1 ^= x0;       x0 ^= x2;       x2 &= x4;       \
 187         x2 ^= x0;       x0 |= x4;                       \
 188         x0 ^= x3;       x3 &= x2;                       \
 189         x4 ^= x3;       x3 ^= x1;       x1 &= x0;       \
 190         x4 ^= x1;       x0 ^= x3;                       \
 191         })
 192
 193 #define SI5(x0, x1, x2, x3, x4) ({                      \
 194                         x4  = x1;       x1 |= x2;       \
 195         x2 ^= x4;       x1 ^= x3;       x3 &= x4;       \
 196         x2 ^= x3;       x3 |= x0;       x0 = ~x0;       \
 197         x3 ^= x2;       x2 |= x0;       x4 ^= x1;       \
 198         x2 ^= x4;       x4 &= x0;       x0 ^= x1;       \
 199         x1 ^= x3;       x0 &= x2;       x2 ^= x3;       \
 200         x0 ^= x2;       x2 ^= x4;       x4 ^= x3;       \
 201         })
 202
 203 #define SI6(x0, x1, x2, x3, x4) ({                      \
 204                         x0 ^= x2;                       \
 205         x4  = x0;       x0 &= x3;       x2 ^= x3;       \
 206         x0 ^= x2;       x3 ^= x1;       x2 |= x4;       \
 207         x2 ^= x3;       x3 &= x0;       x0 = ~x0;       \
 208         x3 ^= x1;       x1 &= x2;       x4 ^= x0;       \
 209         x3 ^= x4;       x4 ^= x2;       x0 ^= x1;       \
 210         x2 ^= x0;                                       \
 211         })
 212
 213 #define SI7(x0, x1, x2, x3, x4) ({                      \
 214         x4  = x3;       x3 &= x0;       x0 ^= x2;       \
 215         x2 |= x4;       x4 ^= x1;       x0 = ~x0;       \
 216         x1 |= x3;       x4 ^= x0;       x0 &= x2;       \
 217         x0 ^= x1;       x1 &= x2;       x3 ^= x2;       \
 218         x4 ^= x3;       x2 &= x3;       x3 |= x0;       \
 219         x1 ^= x4;       x3 ^= x4;       x4 &= x0;       \
 220         x4 ^= x2;                                       \
 221         })
 222
 223 /*
 224  * both gcc and clang have misoptimized this function in the past,
 225  * producing horrible object code from spilling temporary variables
 226  * on the stack. Forcing this part out of line avoids that.
 227  */
 228 static noinline void __serpent_setkey_sbox(u32 r0, u32 r1, u32 r2,
 229                                            u32 r3, u32 r4, u32 *k)
 230 {
 231         k += 100;
 232         S3(r3, r4, r0, r1, r2); store_and_load_keys(r1, r2, r4, r3, 28, 24);
 233         S4(r1, r2, r4, r3, r0); store_and_load_keys(r2, r4, r3, r0, 24, 20);
 234         S5(r2, r4, r3, r0, r1); store_and_load_keys(r1, r2, r4, r0, 20, 16);
 235         S6(r1, r2, r4, r0, r3); store_and_load_keys(r4, r3, r2, r0, 16, 12);
 236         S7(r4, r3, r2, r0, r1); store_and_load_keys(r1, r2, r0, r4, 12, 8);
 237         S0(r1, r2, r0, r4, r3); store_and_load_keys(r0, r2, r4, r1, 8, 4);
 238         S1(r0, r2, r4, r1, r3); store_and_load_keys(r3, r4, r1, r0, 4, 0);
 239         S2(r3, r4, r1, r0, r2); store_and_load_keys(r2, r4, r3, r0, 0, -4);
 240         S3(r2, r4, r3, r0, r1); store_and_load_keys(r0, r1, r4, r2, -4, -8);
 241         S4(r0, r1, r4, r2, r3); store_and_load_keys(r1, r4, r2, r3, -8, -12);
 242         S5(r1, r4, r2, r3, r0); store_and_load_keys(r0, r1, r4, r3, -12, -16);
 243         S6(r0, r1, r4, r3, r2); store_and_load_keys(r4, r2, r1, r3, -16, -20);
 244         S7(r4, r2, r1, r3, r0); store_and_load_keys(r0, r1, r3, r4, -20, -24);
 245         S0(r0, r1, r3, r4, r2); store_and_load_keys(r3, r1, r4, r0, -24, -28);
 246         k -= 50;
 247         S1(r3, r1, r4, r0, r2); store_and_load_keys(r2, r4, r0, r3, 22, 18);
 248         S2(r2, r4, r0, r3, r1); store_and_load_keys(r1, r4, r2, r3, 18, 14);
 249         S3(r1, r4, r2, r3, r0); store_and_load_keys(r3, r0, r4, r1, 14, 10);
 250         S4(r3, r0, r4, r1, r2); store_and_load_keys(r0, r4, r1, r2, 10, 6);
 251         S5(r0, r4, r1, r2, r3); store_and_load_keys(r3, r0, r4, r2, 6, 2);
 252         S6(r3, r0, r4, r2, r1); store_and_load_keys(r4, r1, r0, r2, 2, -2);
 253         S7(r4, r1, r0, r2, r3); store_and_load_keys(r3, r0, r2, r4, -2, -6);
 254         S0(r3, r0, r2, r4, r1); store_and_load_keys(r2, r0, r4, r3, -6, -10);
 255         S1(r2, r0, r4, r3, r1); store_and_load_keys(r1, r4, r3, r2, -10, -14);
 256         S2(r1, r4, r3, r2, r0); store_and_load_keys(r0, r4, r1, r2, -14, -18);
 257         S3(r0, r4, r1, r2, r3); store_and_load_keys(r2, r3, r4, r0, -18, -22);
 258         k -= 50;
 259         S4(r2, r3, r4, r0, r1); store_and_load_keys(r3, r4, r0, r1, 28, 24);
 260         S5(r3, r4, r0, r1, r2); store_and_load_keys(r2, r3, r4, r1, 24, 20);
 261         S6(r2, r3, r4, r1, r0); store_and_load_keys(r4, r0, r3, r1, 20, 16);
 262         S7(r4, r0, r3, r1, r2); store_and_load_keys(r2, r3, r1, r4, 16, 12);
 263         S0(r2, r3, r1, r4, r0); store_and_load_keys(r1, r3, r4, r2, 12, 8);
 264         S1(r1, r3, r4, r2, r0); store_and_load_keys(r0, r4, r2, r1, 8, 4);
 265         S2(r0, r4, r2, r1, r3); store_and_load_keys(r3, r4, r0, r1, 4, 0);
 266         S3(r3, r4, r0, r1, r2); storekeys(r1, r2, r4, r3, 0);
 267 }
 268
 269 int __serpent_setkey(struct serpent_ctx *ctx, const u8 *key,
 270                      unsigned int keylen)
 271 {
 272         u32 *k = ctx->expkey;
 273         u8  *k8 = (u8 *)k;
 274         u32 r0, r1, r2, r3, r4;
 275         __le32 *lk;
 276         int i;
 277
 278         /* Copy key, add padding */
 279
 280         for (i = 0; i < keylen; ++i)
 281                 k8[i] = key[i];
 282         if (i < SERPENT_MAX_KEY_SIZE)
 283                 k8[i++] = 1;
 284         while (i < SERPENT_MAX_KEY_SIZE)
 285                 k8[i++] = 0;
 286
 287         lk = (__le32 *)k;
 288         k[0] = le32_to_cpu(lk[0]);
 289         k[1] = le32_to_cpu(lk[1]);
 290         k[2] = le32_to_cpu(lk[2]);
 291         k[3] = le32_to_cpu(lk[3]);
 292         k[4] = le32_to_cpu(lk[4]);
 293         k[5] = le32_to_cpu(lk[5]);
 294         k[6] = le32_to_cpu(lk[6]);
 295         k[7] = le32_to_cpu(lk[7]);
 296
 297         /* Expand key using polynomial */
 298
 299         r0 = k[3];
 300         r1 = k[4];
 301         r2 = k[5];
 302         r3 = k[6];
 303         r4 = k[7];
 304
 305         keyiter(k[0], r0, r4, r2, 0, 0);
 306         keyiter(k[1], r1, r0, r3, 1, 1);
 307         keyiter(k[2], r2, r1, r4, 2, 2);
 308         keyiter(k[3], r3, r2, r0, 3, 3);
 309         keyiter(k[4], r4, r3, r1, 4, 4);
 310         keyiter(k[5], r0, r4, r2, 5, 5);
 311         keyiter(k[6], r1, r0, r3, 6, 6);
 312         keyiter(k[7], r2, r1, r4, 7, 7);
 313
 314         keyiter(k[0], r3, r2, r0, 8, 8);
 315         keyiter(k[1], r4, r3, r1, 9, 9);
 316         keyiter(k[2], r0, r4, r2, 10, 10);
 317         keyiter(k[3], r1, r0, r3, 11, 11);
 318         keyiter(k[4], r2, r1, r4, 12, 12);
 319         keyiter(k[5], r3, r2, r0, 13, 13);
 320         keyiter(k[6], r4, r3, r1, 14, 14);
 321         keyiter(k[7], r0, r4, r2, 15, 15);
 322         keyiter(k[8], r1, r0, r3, 16, 16);
 323         keyiter(k[9], r2, r1, r4, 17, 17);
 324         keyiter(k[10], r3, r2, r0, 18, 18);
 325         keyiter(k[11], r4, r3, r1, 19, 19);
 326         keyiter(k[12], r0, r4, r2, 20, 20);
 327         keyiter(k[13], r1, r0, r3, 21, 21);
 328         keyiter(k[14], r2, r1, r4, 22, 22);
 329         keyiter(k[15], r3, r2, r0, 23, 23);
 330         keyiter(k[16], r4, r3, r1, 24, 24);
 331         keyiter(k[17], r0, r4, r2, 25, 25);
 332         keyiter(k[18], r1, r0, r3, 26, 26);
 333         keyiter(k[19], r2, r1, r4, 27, 27);
 334         keyiter(k[20], r3, r2, r0, 28, 28);
 335         keyiter(k[21], r4, r3, r1, 29, 29);
 336         keyiter(k[22], r0, r4, r2, 30, 30);
 337         keyiter(k[23], r1, r0, r3, 31, 31);
 338
 339         k += 50;
 340
 341         keyiter(k[-26], r2, r1, r4, 32, -18);
 342         keyiter(k[-25], r3, r2, r0, 33, -17);
 343         keyiter(k[-24], r4, r3, r1, 34, -16);
 344         keyiter(k[-23], r0, r4, r2, 35, -15);
 345         keyiter(k[-22], r1, r0, r3, 36, -14);
 346         keyiter(k[-21], r2, r1, r4, 37, -13);
 347         keyiter(k[-20], r3, r2, r0, 38, -12);
 348         keyiter(k[-19], r4, r3, r1, 39, -11);
 349         keyiter(k[-18], r0, r4, r2, 40, -10);
 350         keyiter(k[-17], r1, r0, r3, 41, -9);
 351         keyiter(k[-16], r2, r1, r4, 42, -8);
 352         keyiter(k[-15], r3, r2, r0, 43, -7);
 353         keyiter(k[-14], r4, r3, r1, 44, -6);
 354         keyiter(k[-13], r0, r4, r2, 45, -5);
 355         keyiter(k[-12], r1, r0, r3, 46, -4);
 356         keyiter(k[-11], r2, r1, r4, 47, -3);
 357         keyiter(k[-10], r3, r2, r0, 48, -2);
 358         keyiter(k[-9], r4, r3, r1, 49, -1);
 359         keyiter(k[-8], r0, r4, r2, 50, 0);
 360         keyiter(k[-7], r1, r0, r3, 51, 1);
 361         keyiter(k[-6], r2, r1, r4, 52, 2);
 362         keyiter(k[-5], r3, r2, r0, 53, 3);
 363         keyiter(k[-4], r4, r3, r1, 54, 4);
 364         keyiter(k[-3], r0, r4, r2, 55, 5);
 365         keyiter(k[-2], r1, r0, r3, 56, 6);
 366         keyiter(k[-1], r2, r1, r4, 57, 7);
 367         keyiter(k[0], r3, r2, r0, 58, 8);
 368         keyiter(k[1], r4, r3, r1, 59, 9);
 369         keyiter(k[2], r0, r4, r2, 60, 10);
 370         keyiter(k[3], r1, r0, r3, 61, 11);
 371         keyiter(k[4], r2, r1, r4, 62, 12);
 372         keyiter(k[5], r3, r2, r0, 63, 13);
 373         keyiter(k[6], r4, r3, r1, 64, 14);
 374         keyiter(k[7], r0, r4, r2, 65, 15);
 375         keyiter(k[8], r1, r0, r3, 66, 16);
 376         keyiter(k[9], r2, r1, r4, 67, 17);
 377         keyiter(k[10], r3, r2, r0, 68, 18);
 378         keyiter(k[11], r4, r3, r1, 69, 19);
 379         keyiter(k[12], r0, r4, r2, 70, 20);
 380         keyiter(k[13], r1, r0, r3, 71, 21);
 381         keyiter(k[14], r2, r1, r4, 72, 22);
 382         keyiter(k[15], r3, r2, r0, 73, 23);
 383         keyiter(k[16], r4, r3, r1, 74, 24);
 384         keyiter(k[17], r0, r4, r2, 75, 25);
 385         keyiter(k[18], r1, r0, r3, 76, 26);
 386         keyiter(k[19], r2, r1, r4, 77, 27);
 387         keyiter(k[20], r3, r2, r0, 78, 28);
 388         keyiter(k[21], r4, r3, r1, 79, 29);
 389         keyiter(k[22], r0, r4, r2, 80, 30);
 390         keyiter(k[23], r1, r0, r3, 81, 31);
 391
 392         k += 50;
 393
 394         keyiter(k[-26], r2, r1, r4, 82, -18);
 395         keyiter(k[-25], r3, r2, r0, 83, -17);
 396         keyiter(k[-24], r4, r3, r1, 84, -16);
 397         keyiter(k[-23], r0, r4, r2, 85, -15);
 398         keyiter(k[-22], r1, r0, r3, 86, -14);
 399         keyiter(k[-21], r2, r1, r4, 87, -13);
 400         keyiter(k[-20], r3, r2, r0, 88, -12);
 401         keyiter(k[-19], r4, r3, r1, 89, -11);
 402         keyiter(k[-18], r0, r4, r2, 90, -10);
 403         keyiter(k[-17], r1, r0, r3, 91, -9);
 404         keyiter(k[-16], r2, r1, r4, 92, -8);
 405         keyiter(k[-15], r3, r2, r0, 93, -7);
 406         keyiter(k[-14], r4, r3, r1, 94, -6);
 407         keyiter(k[-13], r0, r4, r2, 95, -5);
 408         keyiter(k[-12], r1, r0, r3, 96, -4);
 409         keyiter(k[-11], r2, r1, r4, 97, -3);
 410         keyiter(k[-10], r3, r2, r0, 98, -2);
 411         keyiter(k[-9], r4, r3, r1, 99, -1);
 412         keyiter(k[-8], r0, r4, r2, 100, 0);
 413         keyiter(k[-7], r1, r0, r3, 101, 1);
 414         keyiter(k[-6], r2, r1, r4, 102, 2);
 415         keyiter(k[-5], r3, r2, r0, 103, 3);
 416         keyiter(k[-4], r4, r3, r1, 104, 4);
 417         keyiter(k[-3], r0, r4, r2, 105, 5);
 418         keyiter(k[-2], r1, r0, r3, 106, 6);
 419         keyiter(k[-1], r2, r1, r4, 107, 7);
 420         keyiter(k[0], r3, r2, r0, 108, 8);
 421         keyiter(k[1], r4, r3, r1, 109, 9);
 422         keyiter(k[2], r0, r4, r2, 110, 10);
 423         keyiter(k[3], r1, r0, r3, 111, 11);
 424         keyiter(k[4], r2, r1, r4, 112, 12);
 425         keyiter(k[5], r3, r2, r0, 113, 13);
 426         keyiter(k[6], r4, r3, r1, 114, 14);
 427         keyiter(k[7], r0, r4, r2, 115, 15);
 428         keyiter(k[8], r1, r0, r3, 116, 16);
 429         keyiter(k[9], r2, r1, r4, 117, 17);
 430         keyiter(k[10], r3, r2, r0, 118, 18);
 431         keyiter(k[11], r4, r3, r1, 119, 19);
 432         keyiter(k[12], r0, r4, r2, 120, 20);
 433         keyiter(k[13], r1, r0, r3, 121, 21);
 434         keyiter(k[14], r2, r1, r4, 122, 22);
 435         keyiter(k[15], r3, r2, r0, 123, 23);
 436         keyiter(k[16], r4, r3, r1, 124, 24);
 437         keyiter(k[17], r0, r4, r2, 125, 25);
 438         keyiter(k[18], r1, r0, r3, 126, 26);
 439         keyiter(k[19], r2, r1, r4, 127, 27);
 440         keyiter(k[20], r3, r2, r0, 128, 28);
 441         keyiter(k[21], r4, r3, r1, 129, 29);
 442         keyiter(k[22], r0, r4, r2, 130, 30);
 443         keyiter(k[23], r1, r0, r3, 131, 31);
 444
 445         /* Apply S-boxes */
 446         __serpent_setkey_sbox(r0, r1, r2, r3, r4, ctx->expkey);
 447
 448         return 0;
 449 }
 450 EXPORT_SYMBOL_GPL(__serpent_setkey);
 451
 452 int serpent_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen)
 453 {
 454         return __serpent_setkey(crypto_tfm_ctx(tfm), key, keylen);
 455 }
 456 EXPORT_SYMBOL_GPL(serpent_setkey);
 457
 458 void __serpent_encrypt(const void *c, u8 *dst, const u8 *src)
 459 {
 460         const struct serpent_ctx *ctx = c;
 461         const u32 *k = ctx->expkey;
 462         u32     r0, r1, r2, r3, r4;
 463
 464         r0 = get_unaligned_le32(src);
 465         r1 = get_unaligned_le32(src + 4);
 466         r2 = get_unaligned_le32(src + 8);
 467         r3 = get_unaligned_le32(src + 12);
 468
 469                                         K(r0, r1, r2, r3, 0);
 470         S0(r0, r1, r2, r3, r4);         LK(r2, r1, r3, r0, r4, 1);
 471         S1(r2, r1, r3, r0, r4);         LK(r4, r3, r0, r2, r1, 2);
 472         S2(r4, r3, r0, r2, r1);         LK(r1, r3, r4, r2, r0, 3);
 473         S3(r1, r3, r4, r2, r0);         LK(r2, r0, r3, r1, r4, 4);
 474         S4(r2, r0, r3, r1, r4);         LK(r0, r3, r1, r4, r2, 5);
 475         S5(r0, r3, r1, r4, r2);         LK(r2, r0, r3, r4, r1, 6);
 476         S6(r2, r0, r3, r4, r1);         LK(r3, r1, r0, r4, r2, 7);
 477         S7(r3, r1, r0, r4, r2);         LK(r2, r0, r4, r3, r1, 8);
 478         S0(r2, r0, r4, r3, r1);         LK(r4, r0, r3, r2, r1, 9);
 479         S1(r4, r0, r3, r2, r1);         LK(r1, r3, r2, r4, r0, 10);
 480         S2(r1, r3, r2, r4, r0);         LK(r0, r3, r1, r4, r2, 11);
 481         S3(r0, r3, r1, r4, r2);         LK(r4, r2, r3, r0, r1, 12);
 482         S4(r4, r2, r3, r0, r1);         LK(r2, r3, r0, r1, r4, 13);
 483         S5(r2, r3, r0, r1, r4);         LK(r4, r2, r3, r1, r0, 14);
 484         S6(r4, r2, r3, r1, r0);         LK(r3, r0, r2, r1, r4, 15);
 485         S7(r3, r0, r2, r1, r4);         LK(r4, r2, r1, r3, r0, 16);
 486         S0(r4, r2, r1, r3, r0);         LK(r1, r2, r3, r4, r0, 17);
 487         S1(r1, r2, r3, r4, r0);         LK(r0, r3, r4, r1, r2, 18);
 488         S2(r0, r3, r4, r1, r2);         LK(r2, r3, r0, r1, r4, 19);
 489         S3(r2, r3, r0, r1, r4);         LK(r1, r4, r3, r2, r0, 20);
 490         S4(r1, r4, r3, r2, r0);         LK(r4, r3, r2, r0, r1, 21);
 491         S5(r4, r3, r2, r0, r1);         LK(r1, r4, r3, r0, r2, 22);
 492         S6(r1, r4, r3, r0, r2);         LK(r3, r2, r4, r0, r1, 23);
 493         S7(r3, r2, r4, r0, r1);         LK(r1, r4, r0, r3, r2, 24);
 494         S0(r1, r4, r0, r3, r2);         LK(r0, r4, r3, r1, r2, 25);
 495         S1(r0, r4, r3, r1, r2);         LK(r2, r3, r1, r0, r4, 26);
 496         S2(r2, r3, r1, r0, r4);         LK(r4, r3, r2, r0, r1, 27);
 497         S3(r4, r3, r2, r0, r1);         LK(r0, r1, r3, r4, r2, 28);
 498         S4(r0, r1, r3, r4, r2);         LK(r1, r3, r4, r2, r0, 29);
 499         S5(r1, r3, r4, r2, r0);         LK(r0, r1, r3, r2, r4, 30);
 500         S6(r0, r1, r3, r2, r4);         LK(r3, r4, r1, r2, r0, 31);
 501         S7(r3, r4, r1, r2, r0);         K(r0, r1, r2, r3, 32);
 502
 503         put_unaligned_le32(r0, dst);
 504         put_unaligned_le32(r1, dst + 4);
 505         put_unaligned_le32(r2, dst + 8);
 506         put_unaligned_le32(r3, dst + 12);
 507 }
 508 EXPORT_SYMBOL_GPL(__serpent_encrypt);
 509
 510 static void serpent_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
 511 {
 512         struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
 513
 514         __serpent_encrypt(ctx, dst, src);
 515 }
 516
 517 void __serpent_decrypt(const void *c, u8 *dst, const u8 *src)
 518 {
 519         const struct serpent_ctx *ctx = c;
 520         const u32 *k = ctx->expkey;
 521         u32     r0, r1, r2, r3, r4;
 522
 523         r0 = get_unaligned_le32(src);
 524         r1 = get_unaligned_le32(src + 4);
 525         r2 = get_unaligned_le32(src + 8);
 526         r3 = get_unaligned_le32(src + 12);
 527
 528                                         K(r0, r1, r2, r3, 32);
 529         SI7(r0, r1, r2, r3, r4);        KL(r1, r3, r0, r4, r2, 31);
 530         SI6(r1, r3, r0, r4, r2);        KL(r0, r2, r4, r1, r3, 30);
 531         SI5(r0, r2, r4, r1, r3);        KL(r2, r3, r0, r4, r1, 29);
 532         SI4(r2, r3, r0, r4, r1);        KL(r2, r0, r1, r4, r3, 28);
 533         SI3(r2, r0, r1, r4, r3);        KL(r1, r2, r3, r4, r0, 27);
 534         SI2(r1, r2, r3, r4, r0);        KL(r2, r0, r4, r3, r1, 26);
 535         SI1(r2, r0, r4, r3, r1);        KL(r1, r0, r4, r3, r2, 25);
 536         SI0(r1, r0, r4, r3, r2);        KL(r4, r2, r0, r1, r3, 24);
 537         SI7(r4, r2, r0, r1, r3);        KL(r2, r1, r4, r3, r0, 23);
 538         SI6(r2, r1, r4, r3, r0);        KL(r4, r0, r3, r2, r1, 22);
 539         SI5(r4, r0, r3, r2, r1);        KL(r0, r1, r4, r3, r2, 21);
 540         SI4(r0, r1, r4, r3, r2);        KL(r0, r4, r2, r3, r1, 20);
 541         SI3(r0, r4, r2, r3, r1);        KL(r2, r0, r1, r3, r4, 19);
 542         SI2(r2, r0, r1, r3, r4);        KL(r0, r4, r3, r1, r2, 18);
 543         SI1(r0, r4, r3, r1, r2);        KL(r2, r4, r3, r1, r0, 17);
 544         SI0(r2, r4, r3, r1, r0);        KL(r3, r0, r4, r2, r1, 16);
 545         SI7(r3, r0, r4, r2, r1);        KL(r0, r2, r3, r1, r4, 15);
 546         SI6(r0, r2, r3, r1, r4);        KL(r3, r4, r1, r0, r2, 14);
 547         SI5(r3, r4, r1, r0, r2);        KL(r4, r2, r3, r1, r0, 13);
 548         SI4(r4, r2, r3, r1, r0);        KL(r4, r3, r0, r1, r2, 12);
 549         SI3(r4, r3, r0, r1, r2);        KL(r0, r4, r2, r1, r3, 11);
 550         SI2(r0, r4, r2, r1, r3);        KL(r4, r3, r1, r2, r0, 10);
 551         SI1(r4, r3, r1, r2, r0);        KL(r0, r3, r1, r2, r4, 9);
 552         SI0(r0, r3, r1, r2, r4);        KL(r1, r4, r3, r0, r2, 8);
 553         SI7(r1, r4, r3, r0, r2);        KL(r4, r0, r1, r2, r3, 7);
 554         SI6(r4, r0, r1, r2, r3);        KL(r1, r3, r2, r4, r0, 6);
 555         SI5(r1, r3, r2, r4, r0);        KL(r3, r0, r1, r2, r4, 5);
 556         SI4(r3, r0, r1, r2, r4);        KL(r3, r1, r4, r2, r0, 4);
 557         SI3(r3, r1, r4, r2, r0);        KL(r4, r3, r0, r2, r1, 3);
 558         SI2(r4, r3, r0, r2, r1);        KL(r3, r1, r2, r0, r4, 2);
 559         SI1(r3, r1, r2, r0, r4);        KL(r4, r1, r2, r0, r3, 1);
 560         SI0(r4, r1, r2, r0, r3);        K(r2, r3, r1, r4, 0);
 561
 562         put_unaligned_le32(r2, dst);
 563         put_unaligned_le32(r3, dst + 4);
 564         put_unaligned_le32(r1, dst + 8);
 565         put_unaligned_le32(r4, dst + 12);
 566 }
 567 EXPORT_SYMBOL_GPL(__serpent_decrypt);
 568
 569 static void serpent_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
 570 {
 571         struct serpent_ctx *ctx = crypto_tfm_ctx(tfm);
 572
 573         __serpent_decrypt(ctx, dst, src);
 574 }
 575
 576 static struct crypto_alg srp_alg = {
 577         .cra_name               =       "serpent",
 578         .cra_driver_name        =       "serpent-generic",
 579         .cra_priority           =       100,
 580         .cra_flags              =       CRYPTO_ALG_TYPE_CIPHER,
 581         .cra_blocksize          =       SERPENT_BLOCK_SIZE,
 582         .cra_ctxsize            =       sizeof(struct serpent_ctx),
 583         .cra_module             =       THIS_MODULE,
 584         .cra_u                  =       { .cipher = {
 585         .cia_min_keysize        =       SERPENT_MIN_KEY_SIZE,
 586         .cia_max_keysize        =       SERPENT_MAX_KEY_SIZE,
 587         .cia_setkey             =       serpent_setkey,
 588         .cia_encrypt            =       serpent_encrypt,
 589         .cia_decrypt            =       serpent_decrypt } }
 590 };
 591
 592 static int __init serpent_mod_init(void)
 593 {
 594         return crypto_register_alg(&srp_alg);
 595 }
 596
 597 static void __exit serpent_mod_fini(void)
 598 {
 599         crypto_unregister_alg(&srp_alg);
 600 }
 601
 602 subsys_initcall(serpent_mod_init);
 603 module_exit(serpent_mod_fini);
 604
 605 MODULE_LICENSE("GPL");
 606 MODULE_DESCRIPTION("Serpent Cipher Algorithm");
 607 MODULE_AUTHOR("Dag Arne Osvik <osvik@ii.uib.no>");
 608 MODULE_ALIAS_CRYPTO("serpent");
 609 MODULE_ALIAS_CRYPTO("serpent-generic");