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: 10 * Ruben Jesus Garcia Hernandez <ruben@ugr.es>, 18.10.2004 11 * Based on code by hvr 12 * 13 * This program is free software; you can redistribute it and/or modify 14 * it under the terms of the GNU General Public License as published by 15 * the Free Software Foundation; either version 2 of the License, or 16 * (at your option) any later version. 17 */ 18 19 #include <linux/init.h> 20 #include <linux/module.h> 21 #include <linux/errno.h> 22 #include <asm/byteorder.h> 23 #include <linux/crypto.h> 24 #include <linux/types.h> 25 #include <crypto/serpent.h> 26 27 /* Key is padded to the maximum of 256 bits before round key generation. 28 * Any key length <= 256 bits (32 bytes) is allowed by the algorithm. 29 */ 30 31 #define PHI 0x9e3779b9UL 32 33 #define keyiter(a, b, c, d, i, j) \ 34 ({ b ^= d; b ^= c; b ^= a; b ^= PHI ^ i; b = rol32(b, 11); k[j] = b; }) 35 36 #define loadkeys(x0, x1, x2, x3, i) \ 37 ({ x0 = k[i]; x1 = k[i+1]; x2 = k[i+2]; x3 = k[i+3]; }) 38 39 #define storekeys(x0, x1, x2, x3, i) \ 40 ({ k[i] = x0; k[i+1] = x1; k[i+2] = x2; k[i+3] = x3; }) 41 42 #define store_and_load_keys(x0, x1, x2, x3, s, l) \ 43 ({ storekeys(x0, x1, x2, x3, s); loadkeys(x0, x1, x2, x3, l); }) 44 45 #define K(x0, x1, x2, x3, i) ({ \ 46 x3 ^= k[4*(i)+3]; x2 ^= k[4*(i)+2]; \ 47 x1 ^= k[4*(i)+1]; x0 ^= k[4*(i)+0]; \ 48 }) 49 50 #define LK(x0, x1, x2, x3, x4, i) ({ \ 51 x0 = rol32(x0, 13);\ 52 x2 = rol32(x2, 3); x1 ^= x0; x4 = x0 << 3; \ 53 x3 ^= x2; x1 ^= x2; \ 54 x1 = rol32(x1, 1); x3 ^= x4; \ 55 x3 = rol32(x3, 7); x4 = x1; \ 56 x0 ^= x1; x4 <<= 7; x2 ^= x3; \ 57 x0 ^= x3; x2 ^= x4; x3 ^= k[4*i+3]; \ 58 x1 ^= k[4*i+1]; x0 = rol32(x0, 5); x2 = rol32(x2, 22);\ 59 x0 ^= k[4*i+0]; x2 ^= k[4*i+2]; \ 60 }) 61 62 #define KL(x0, x1, x2, x3, x4, i) ({ \ 63 x0 ^= k[4*i+0]; x1 ^= k[4*i+1]; x2 ^= k[4*i+2]; \ 64 x3 ^= k[4*i+3]; x0 = ror32(x0, 5); x2 = ror32(x2, 22);\ 65 x4 = x1; x2 ^= x3; x0 ^= x3; \ 66 x4 <<= 7; x0 ^= x1; x1 = ror32(x1, 1); \ 67 x2 ^= x4; x3 = ror32(x3, 7); x4 = x0 << 3; \ 68 x1 ^= x0; x3 ^= x4; x0 = ror32(x0, 13);\ 69 x1 ^= x2; x3 ^= x2; x2 = ror32(x2, 3); \ 70 }) 71 72 #define S0(x0, x1, x2, x3, x4) ({ \ 73 x4 = x3; \ 74 x3 |= x0; x0 ^= x4; x4 ^= x2; \ 75 x4 = ~x4; x3 ^= x1; x1 &= x0; \ 76 x1 ^= x4; x2 ^= x0; x0 ^= x3; \ 77 x4 |= x0; x0 ^= x2; x2 &= x1; \ 78 x3 ^= x2; x1 = ~x1; x2 ^= x4; \ 79 x1 ^= x2; \ 80 }) 81 82 #define S1(x0, x1, x2, x3, x4) ({ \ 83 x4 = x1; \ 84 x1 ^= x0; x0 ^= x3; x3 = ~x3; \ 85 x4 &= x1; x0 |= x1; x3 ^= x2; \ 86 x0 ^= x3; x1 ^= x3; x3 ^= x4; \ 87 x1 |= x4; x4 ^= x2; x2 &= x0; \ 88 x2 ^= x1; x1 |= x0; x0 = ~x0; \ 89 x0 ^= x2; x4 ^= x1; \ 90 }) 91 92 #define S2(x0, x1, x2, x3, x4) ({ \ 93 x3 = ~x3; \ 94 x1 ^= x0; x4 = x0; x0 &= x2; \ 95 x0 ^= x3; x3 |= x4; x2 ^= x1; \ 96 x3 ^= x1; x1 &= x0; x0 ^= x2; \ 97 x2 &= x3; x3 |= x1; x0 = ~x0; \ 98 x3 ^= x0; x4 ^= x0; x0 ^= x2; \ 99 x1 |= x2; \ 100 }) 101 102 #define S3(x0, x1, x2, x3, x4) ({ \ 103 x4 = x1; \ 104 x1 ^= x3; x3 |= x0; x4 &= x0; \ 105 x0 ^= x2; x2 ^= x1; x1 &= x3; \ 106 x2 ^= x3; x0 |= x4; x4 ^= x3; \ 107 x1 ^= x0; x0 &= x3; x3 &= x4; \ 108 x3 ^= x2; x4 |= x1; x2 &= x1; \ 109 x4 ^= x3; x0 ^= x3; x3 ^= x2; \ 110 }) 111 112 #define S4(x0, x1, x2, x3, x4) ({ \ 113 x4 = x3; \ 114 x3 &= x0; x0 ^= x4; \ 115 x3 ^= x2; x2 |= x4; x0 ^= x1; \ 116 x4 ^= x3; x2 |= x0; \ 117 x2 ^= x1; x1 &= x0; \ 118 x1 ^= x4; x4 &= x2; x2 ^= x3; \ 119 x4 ^= x0; x3 |= x1; x1 = ~x1; \ 120 x3 ^= x0; \ 121 }) 122 123 #define S5(x0, x1, x2, x3, x4) ({ \ 124 x4 = x1; x1 |= x0; \ 125 x2 ^= x1; x3 = ~x3; x4 ^= x0; \ 126 x0 ^= x2; x1 &= x4; x4 |= x3; \ 127 x4 ^= x0; x0 &= x3; x1 ^= x3; \ 128 x3 ^= x2; x0 ^= x1; x2 &= x4; \ 129 x1 ^= x2; x2 &= x0; \ 130 x3 ^= x2; \ 131 }) 132 133 #define S6(x0, x1, x2, x3, x4) ({ \ 134 x4 = x1; \ 135 x3 ^= x0; x1 ^= x2; x2 ^= x0; \ 136 x0 &= x3; x1 |= x3; x4 = ~x4; \ 137 x0 ^= x1; x1 ^= x2; \ 138 x3 ^= x4; x4 ^= x0; x2 &= x0; \ 139 x4 ^= x1; x2 ^= x3; x3 &= x1; \ 140 x3 ^= x0; x1 ^= x2; \ 141 }) 142 143 #define S7(x0, x1, x2, x3, x4) ({ \ 144 x1 = ~x1; \ 145 x4 = x1; x0 = ~x0; x1 &= x2; \ 146 x1 ^= x3; x3 |= x4; x4 ^= x2; \ 147 x2 ^= x3; x3 ^= x0; x0 |= x1; \ 148 x2 &= x0; x0 ^= x4; x4 ^= x3; \ 149 x3 &= x0; x4 ^= x1; \ 150 x2 ^= x4; x3 ^= x1; x4 |= x0; \ 151 x4 ^= x1; \ 152 }) 153 154 #define SI0(x0, x1, x2, x3, x4) ({ \ 155 x4 = x3; x1 ^= x0; \ 156 x3 |= x1; x4 ^= x1; x0 = ~x0; \ 157 x2 ^= x3; x3 ^= x0; x0 &= x1; \ 158 x0 ^= x2; x2 &= x3; x3 ^= x4; \ 159 x2 ^= x3; x1 ^= x3; x3 &= x0; \ 160 x1 ^= x0; x0 ^= x2; x4 ^= x3; \ 161 }) 162 163 #define SI1(x0, x1, x2, x3, x4) ({ \ 164 x1 ^= x3; x4 = x0; \ 165 x0 ^= x2; x2 = ~x2; x4 |= x1; \ 166 x4 ^= x3; x3 &= x1; x1 ^= x2; \ 167 x2 &= x4; x4 ^= x1; x1 |= x3; \ 168 x3 ^= x0; x2 ^= x0; x0 |= x4; \ 169 x2 ^= x4; x1 ^= x0; \ 170 x4 ^= x1; \ 171 }) 172 173 #define SI2(x0, x1, x2, x3, x4) ({ \ 174 x2 ^= x1; x4 = x3; x3 = ~x3; \ 175 x3 |= x2; x2 ^= x4; x4 ^= x0; \ 176 x3 ^= x1; x1 |= x2; x2 ^= x0; \ 177 x1 ^= x4; x4 |= x3; x2 ^= x3; \ 178 x4 ^= x2; x2 &= x1; \ 179 x2 ^= x3; x3 ^= x4; x4 ^= x0; \ 180 }) 181 182 #define SI3(x0, x1, x2, x3, x4) ({ \ 183 x2 ^= x1; \ 184 x4 = x1; x1 &= x2; \ 185 x1 ^= x0; x0 |= x4; x4 ^= x3; \ 186 x0 ^= x3; x3 |= x1; x1 ^= x2; \ 187 x1 ^= x3; x0 ^= x2; x2 ^= x3; \ 188 x3 &= x1; x1 ^= x0; x0 &= x2; \ 189 x4 ^= x3; x3 ^= x0; x0 ^= x1; \ 190 }) 191 192 #define SI4(x0, x1, x2, x3, x4) ({ \ 193 x2 ^= x3; x4 = x0; x0 &= x1; \ 194 x0 ^= x2; x2 |= x3; x4 = ~x4; \ 195 x1 ^= x0; x0 ^= x2; x2 &= x4; \ 196 x2 ^= x0; x0 |= x4; \ 197 x0 ^= x3; x3 &= x2; \ 198 x4 ^= x3; x3 ^= x1; x1 &= x0; \ 199 x4 ^= x1; x0 ^= x3; \ 200 }) 201 202 #define SI5(x0, x1, x2, x3, x4) ({ \ 203 x4 = x1; x1 |= x2; \ 204 x2 ^= x4; x1 ^= x3; x3 &= x4; \ 205 x2 ^= x3; x3 |= x0; x0 = ~x0; \ 206 x3 ^= x2; x2 |= x0; x4 ^= x1; \ 207 x2 ^= x4; x4 &= x0; x0 ^= x1; \ 208 x1 ^= x3; x0 &= x2; x2 ^= x3; \ 209 x0 ^= x2; x2 ^= x4; x4 ^= x3; \ 210 }) 211 212 #define SI6(x0, x1, x2, x3, x4) ({ \ 213 x0 ^= x2; \ 214 x4 = x0; x0 &= x3; x2 ^= x3; \ 215 x0 ^= x2; x3 ^= x1; x2 |= x4; \ 216 x2 ^= x3; x3 &= x0; x0 = ~x0; \ 217 x3 ^= x1; x1 &= x2; x4 ^= x0; \ 218 x3 ^= x4; x4 ^= x2; x0 ^= x1; \ 219 x2 ^= x0; \ 220 }) 221 222 #define SI7(x0, x1, x2, x3, x4) ({ \ 223 x4 = x3; x3 &= x0; x0 ^= x2; \ 224 x2 |= x4; x4 ^= x1; x0 = ~x0; \ 225 x1 |= x3; x4 ^= x0; x0 &= x2; \ 226 x0 ^= x1; x1 &= x2; x3 ^= x2; \ 227 x4 ^= x3; x2 &= x3; x3 |= x0; \ 228 x1 ^= x4; x3 ^= x4; x4 &= x0; \ 229 x4 ^= x2; \ 230 }) 231 232 int __serpent_setkey(struct serpent_ctx *ctx, const u8 *key, 233 unsigned int keylen) 234 { 235 u32 *k = ctx->expkey; 236 u8 *k8 = (u8 *)k; 237 u32 r0, r1, r2, r3, r4; 238 int i; 239 240 /* Copy key, add padding */ 241 242 for (i = 0; i < keylen; ++i) 243 k8[i] = key[i]; 244 if (i < SERPENT_MAX_KEY_SIZE) 245 k8[i++] = 1; 246 while (i < SERPENT_MAX_KEY_SIZE) 247 k8[i++] = 0; 248 249 /* Expand key using polynomial */ 250 251 r0 = le32_to_cpu(k[3]); 252 r1 = le32_to_cpu(k[4]); 253 r2 = le32_to_cpu(k[5]); 254 r3 = le32_to_cpu(k[6]); 255 r4 = le32_to_cpu(k[7]); 256 257 keyiter(le32_to_cpu(k[0]), r0, r4, r2, 0, 0); 258 keyiter(le32_to_cpu(k[1]), r1, r0, r3, 1, 1); 259 keyiter(le32_to_cpu(k[2]), r2, r1, r4, 2, 2); 260 keyiter(le32_to_cpu(k[3]), r3, r2, r0, 3, 3); 261 keyiter(le32_to_cpu(k[4]), r4, r3, r1, 4, 4); 262 keyiter(le32_to_cpu(k[5]), r0, r4, r2, 5, 5); 263 keyiter(le32_to_cpu(k[6]), r1, r0, r3, 6, 6); 264 keyiter(le32_to_cpu(k[7]), r2, r1, r4, 7, 7); 265 266 keyiter(k[0], r3, r2, r0, 8, 8); 267 keyiter(k[1], r4, r3, r1, 9, 9); 268 keyiter(k[2], r0, r4, r2, 10, 10); 269 keyiter(k[3], r1, r0, r3, 11, 11); 270 keyiter(k[4], r2, r1, r4, 12, 12); 271 keyiter(k[5], r3, r2, r0, 13, 13); 272 keyiter(k[6], r4, r3, r1, 14, 14); 273 keyiter(k[7], r0, r4, r2, 15, 15); 274 keyiter(k[8], r1, r0, r3, 16, 16); 275 keyiter(k[9], r2, r1, r4, 17, 17); 276 keyiter(k[10], r3, r2, r0, 18, 18); 277 keyiter(k[11], r4, r3, r1, 19, 19); 278 keyiter(k[12], r0, r4, r2, 20, 20); 279 keyiter(k[13], r1, r0, r3, 21, 21); 280 keyiter(k[14], r2, r1, r4, 22, 22); 281 keyiter(k[15], r3, r2, r0, 23, 23); 282 keyiter(k[16], r4, r3, r1, 24, 24); 283 keyiter(k[17], r0, r4, r2, 25, 25); 284 keyiter(k[18], r1, r0, r3, 26, 26); 285 keyiter(k[19], r2, r1, r4, 27, 27); 286 keyiter(k[20], r3, r2, r0, 28, 28); 287 keyiter(k[21], r4, r3, r1, 29, 29); 288 keyiter(k[22], r0, r4, r2, 30, 30); 289 keyiter(k[23], r1, r0, r3, 31, 31); 290 291 k += 50; 292 293 keyiter(k[-26], r2, r1, r4, 32, -18); 294 keyiter(k[-25], r3, r2, r0, 33, -17); 295 keyiter(k[-24], r4, r3, r1, 34, -16); 296 keyiter(k[-23], r0, r4, r2, 35, -15); 297 keyiter(k[-22], r1, r0, r3, 36, -14); 298 keyiter(k[-21], r2, r1, r4, 37, -13); 299 keyiter(k[-20], r3, r2, r0, 38, -12); 300 keyiter(k[-19], r4, r3, r1, 39, -11); 301 keyiter(k[-18], r0, r4, r2, 40, -10); 302 keyiter(k[-17], r1, r0, r3, 41, -9); 303 keyiter(k[-16], r2, r1, r4, 42, -8); 304 keyiter(k[-15], r3, r2, r0, 43, -7); 305 keyiter(k[-14], r4, r3, r1, 44, -6); 306 keyiter(k[-13], r0, r4, r2, 45, -5); 307 keyiter(k[-12], r1, r0, r3, 46, -4); 308 keyiter(k[-11], r2, r1, r4, 47, -3); 309 keyiter(k[-10], r3, r2, r0, 48, -2); 310 keyiter(k[-9], r4, r3, r1, 49, -1); 311 keyiter(k[-8], r0, r4, r2, 50, 0); 312 keyiter(k[-7], r1, r0, r3, 51, 1); 313 keyiter(k[-6], r2, r1, r4, 52, 2); 314 keyiter(k[-5], r3, r2, r0, 53, 3); 315 keyiter(k[-4], r4, r3, r1, 54, 4); 316 keyiter(k[-3], r0, r4, r2, 55, 5); 317 keyiter(k[-2], r1, r0, r3, 56, 6); 318 keyiter(k[-1], r2, r1, r4, 57, 7); 319 keyiter(k[0], r3, r2, r0, 58, 8); 320 keyiter(k[1], r4, r3, r1, 59, 9); 321 keyiter(k[2], r0, r4, r2, 60, 10); 322 keyiter(k[3], r1, r0, r3, 61, 11); 323 keyiter(k[4], r2, r1, r4, 62, 12); 324 keyiter(k[5], r3, r2, r0, 63, 13); 325 keyiter(k[6], r4, r3, r1, 64, 14); 326 keyiter(k[7], r0, r4, r2, 65, 15); 327 keyiter(k[8], r1, r0, r3, 66, 16); 328 keyiter(k[9], r2, r1, r4, 67, 17); 329 keyiter(k[10], r3, r2, r0, 68, 18); 330 keyiter(k[11], r4, r3, r1, 69, 19); 331 keyiter(k[12], r0, r4, r2, 70, 20); 332 keyiter(k[13], r1, r0, r3, 71, 21); 333 keyiter(k[14], r2, r1, r4, 72, 22); 334 keyiter(k[15], r3, r2, r0, 73, 23); 335 keyiter(k[16], r4, r3, r1, 74, 24); 336 keyiter(k[17], r0, r4, r2, 75, 25); 337 keyiter(k[18], r1, r0, r3, 76, 26); 338 keyiter(k[19], r2, r1, r4, 77, 27); 339 keyiter(k[20], r3, r2, r0, 78, 28); 340 keyiter(k[21], r4, r3, r1, 79, 29); 341 keyiter(k[22], r0, r4, r2, 80, 30); 342 keyiter(k[23], r1, r0, r3, 81, 31); 343 344 k += 50; 345 346 keyiter(k[-26], r2, r1, r4, 82, -18); 347 keyiter(k[-25], r3, r2, r0, 83, -17); 348 keyiter(k[-24], r4, r3, r1, 84, -16); 349 keyiter(k[-23], r0, r4, r2, 85, -15); 350 keyiter(k[-22], r1, r0, r3, 86, -14); 351 keyiter(k[-21], r2, r1, r4, 87, -13); 352 keyiter(k[-20], r3, r2, r0, 88, -12); 353 keyiter(k[-19], r4, r3, r1, 89, -11); 354 keyiter(k[-18], r0, r4, r2, 90, -10); 355 keyiter(k[-17], r1, r0, r3, 91, -9); 356 keyiter(k[-16], r2, r1, r4, 92, -8); 357 keyiter(k[-15], r3, r2, r0, 93, -7); 358 keyiter(k[-14], r4, r3, r1, 94, -6); 359 keyiter(k[-13], r0, r4, r2, 95, -5); 360 keyiter(k[-12], r1, r0, r3, 96, -4); 361 keyiter(k[-11], r2, r1, r4, 97, -3); 362 keyiter(k[-10], r3, r2, r0, 98, -2); 363 keyiter(k[-9], r4, r3, r1, 99, -1); 364 keyiter(k[-8], r0, r4, r2, 100, 0); 365 keyiter(k[-7], r1, r0, r3, 101, 1); 366 keyiter(k[-6], r2, r1, r4, 102, 2); 367 keyiter(k[-5], r3, r2, r0, 103, 3); 368 keyiter(k[-4], r4, r3, r1, 104, 4); 369 keyiter(k[-3], r0, r4, r2, 105, 5); 370 keyiter(k[-2], r1, r0, r3, 106, 6); 371 keyiter(k[-1], r2, r1, r4, 107, 7); 372 keyiter(k[0], r3, r2, r0, 108, 8); 373 keyiter(k[1], r4, r3, r1, 109, 9); 374 keyiter(k[2], r0, r4, r2, 110, 10); 375 keyiter(k[3], r1, r0, r3, 111, 11); 376 keyiter(k[4], r2, r1, r4, 112, 12); 377 keyiter(k[5], r3, r2, r0, 113, 13); 378 keyiter(k[6], r4, r3, r1, 114, 14); 379 keyiter(k[7], r0, r4, r2, 115, 15); 380 keyiter(k[8], r1, r0, r3, 116, 16); 381 keyiter(k[9], r2, r1, r4, 117, 17); 382 keyiter(k[10], r3, r2, r0, 118, 18); 383 keyiter(k[11], r4, r3, r1, 119, 19); 384 keyiter(k[12], r0, r4, r2, 120, 20); 385 keyiter(k[13], r1, r0, r3, 121, 21); 386 keyiter(k[14], r2, r1, r4, 122, 22); 387 keyiter(k[15], r3, r2, r0, 123, 23); 388 keyiter(k[16], r4, r3, r1, 124, 24); 389 keyiter(k[17], r0, r4, r2, 125, 25); 390 keyiter(k[18], r1, r0, r3, 126, 26); 391 keyiter(k[19], r2, r1, r4, 127, 27); 392 keyiter(k[20], r3, r2, r0, 128, 28); 393 keyiter(k[21], r4, r3, r1, 129, 29); 394 keyiter(k[22], r0, r4, r2, 130, 30); 395 keyiter(k[23], r1, r0, r3, 131, 31); 396 397 /* Apply S-boxes */ 398 399 S3(r3, r4, r0, r1, r2); store_and_load_keys(r1, r2, r4, r3, 28, 24); 400 S4(r1, r2, r4, r3, r0); store_and_load_keys(r2, r4, r3, r0, 24, 20); 401 S5(r2, r4, r3, r0, r1); store_and_load_keys(r1, r2, r4, r0, 20, 16); 402 S6(r1, r2, r4, r0, r3); store_and_load_keys(r4, r3, r2, r0, 16, 12); 403 S7(r4, r3, r2, r0, r1); store_and_load_keys(r1, r2, r0, r4, 12, 8); 404 S0(r1, r2, r0, r4, r3); store_and_load_keys(r0, r2, r4, r1, 8, 4); 405 S1(r0, r2, r4, r1, r3); store_and_load_keys(r3, r4, r1, r0, 4, 0); 406 S2(r3, r4, r1, r0, r2); store_and_load_keys(r2, r4, r3, r0, 0, -4); 407 S3(r2, r4, r3, r0, r1); store_and_load_keys(r0, r1, r4, r2, -4, -8); 408 S4(r0, r1, r4, r2, r3); store_and_load_keys(r1, r4, r2, r3, -8, -12); 409 S5(r1, r4, r2, r3, r0); store_and_load_keys(r0, r1, r4, r3, -12, -16); 410 S6(r0, r1, r4, r3, r2); store_and_load_keys(r4, r2, r1, r3, -16, -20); 411 S7(r4, r2, r1, r3, r0); store_and_load_keys(r0, r1, r3, r4, -20, -24); 412 S0(r0, r1, r3, r4, r2); store_and_load_keys(r3, r1, r4, r0, -24, -28); 413 k -= 50; 414 S1(r3, r1, r4, r0, r2); store_and_load_keys(r2, r4, r0, r3, 22, 18); 415 S2(r2, r4, r0, r3, r1); store_and_load_keys(r1, r4, r2, r3, 18, 14); 416 S3(r1, r4, r2, r3, r0); store_and_load_keys(r3, r0, r4, r1, 14, 10); 417 S4(r3, r0, r4, r1, r2); store_and_load_keys(r0, r4, r1, r2, 10, 6); 418 S5(r0, r4, r1, r2, r3); store_and_load_keys(r3, r0, r4, r2, 6, 2); 419 S6(r3, r0, r4, r2, r1); store_and_load_keys(r4, r1, r0, r2, 2, -2); 420 S7(r4, r1, r0, r2, r3); store_and_load_keys(r3, r0, r2, r4, -2, -6); 421 S0(r3, r0, r2, r4, r1); store_and_load_keys(r2, r0, r4, r3, -6, -10); 422 S1(r2, r0, r4, r3, r1); store_and_load_keys(r1, r4, r3, r2, -10, -14); 423 S2(r1, r4, r3, r2, r0); store_and_load_keys(r0, r4, r1, r2, -14, -18); 424 S3(r0, r4, r1, r2, r3); store_and_load_keys(r2, r3, r4, r0, -18, -22); 425 k -= 50; 426 S4(r2, r3, r4, r0, r1); store_and_load_keys(r3, r4, r0, r1, 28, 24); 427 S5(r3, r4, r0, r1, r2); store_and_load_keys(r2, r3, r4, r1, 24, 20); 428 S6(r2, r3, r4, r1, r0); store_and_load_keys(r4, r0, r3, r1, 20, 16); 429 S7(r4, r0, r3, r1, r2); store_and_load_keys(r2, r3, r1, r4, 16, 12); 430 S0(r2, r3, r1, r4, r0); store_and_load_keys(r1, r3, r4, r2, 12, 8); 431 S1(r1, r3, r4, r2, r0); store_and_load_keys(r0, r4, r2, r1, 8, 4); 432 S2(r0, r4, r2, r1, r3); store_and_load_keys(r3, r4, r0, r1, 4, 0); 433 S3(r3, r4, r0, r1, r2); storekeys(r1, r2, r4, r3, 0); 434 435 return 0; 436 } 437 EXPORT_SYMBOL_GPL(__serpent_setkey); 438 439 int serpent_setkey(struct crypto_tfm *tfm, const u8 *key, unsigned int keylen) 440 { 441 return __serpent_setkey(crypto_tfm_ctx(tfm), key, keylen); 442 } 443 EXPORT_SYMBOL_GPL(serpent_setkey); 444 445 void __serpent_encrypt(struct serpent_ctx *ctx, u8 *dst, const u8 *src) 446 { 447 const u32 *k = ctx->expkey; 448 const __le32 *s = (const __le32 *)src; 449 __le32 *d = (__le32 *)dst; 450 u32 r0, r1, r2, r3, r4; 451 452 /* 453 * Note: The conversions between u8* and u32* might cause trouble 454 * on architectures with stricter alignment rules than x86 455 */ 456 457 r0 = le32_to_cpu(s[0]); 458 r1 = le32_to_cpu(s[1]); 459 r2 = le32_to_cpu(s[2]); 460 r3 = le32_to_cpu(s[3]); 461 462 K(r0, r1, r2, r3, 0); 463 S0(r0, r1, r2, r3, r4); LK(r2, r1, r3, r0, r4, 1); 464 S1(r2, r1, r3, r0, r4); LK(r4, r3, r0, r2, r1, 2); 465 S2(r4, r3, r0, r2, r1); LK(r1, r3, r4, r2, r0, 3); 466 S3(r1, r3, r4, r2, r0); LK(r2, r0, r3, r1, r4, 4); 467 S4(r2, r0, r3, r1, r4); LK(r0, r3, r1, r4, r2, 5); 468 S5(r0, r3, r1, r4, r2); LK(r2, r0, r3, r4, r1, 6); 469 S6(r2, r0, r3, r4, r1); LK(r3, r1, r0, r4, r2, 7); 470 S7(r3, r1, r0, r4, r2); LK(r2, r0, r4, r3, r1, 8); 471 S0(r2, r0, r4, r3, r1); LK(r4, r0, r3, r2, r1, 9); 472 S1(r4, r0, r3, r2, r1); LK(r1, r3, r2, r4, r0, 10); 473 S2(r1, r3, r2, r4, r0); LK(r0, r3, r1, r4, r2, 11); 474 S3(r0, r3, r1, r4, r2); LK(r4, r2, r3, r0, r1, 12); 475 S4(r4, r2, r3, r0, r1); LK(r2, r3, r0, r1, r4, 13); 476 S5(r2, r3, r0, r1, r4); LK(r4, r2, r3, r1, r0, 14); 477 S6(r4, r2, r3, r1, r0); LK(r3, r0, r2, r1, r4, 15); 478 S7(r3, r0, r2, r1, r4); LK(r4, r2, r1, r3, r0, 16); 479 S0(r4, r2, r1, r3, r0); LK(r1, r2, r3, r4, r0, 17); 480 S1(r1, r2, r3, r4, r0); LK(r0, r3, r4, r1, r2, 18); 481 S2(r0, r3, r4, r1, r2); LK(r2, r3, r0, r1, r4, 19); 482 S3(r2, r3, r0, r1, r4); LK(r1, r4, r3, r2, r0, 20); 483 S4(r1, r4, r3, r2, r0); LK(r4, r3, r2, r0, r1, 21); 484 S5(r4, r3, r2, r0, r1); LK(r1, r4, r3, r0, r2, 22); 485 S6(r1, r4, r3, r0, r2); LK(r3, r2, r4, r0, r1, 23); 486 S7(r3, r2, r4, r0, r1); LK(r1, r4, r0, r3, r2, 24); 487 S0(r1, r4, r0, r3, r2); LK(r0, r4, r3, r1, r2, 25); 488 S1(r0, r4, r3, r1, r2); LK(r2, r3, r1, r0, r4, 26); 489 S2(r2, r3, r1, r0, r4); LK(r4, r3, r2, r0, r1, 27); 490 S3(r4, r3, r2, r0, r1); LK(r0, r1, r3, r4, r2, 28); 491 S4(r0, r1, r3, r4, r2); LK(r1, r3, r4, r2, r0, 29); 492 S5(r1, r3, r4, r2, r0); LK(r0, r1, r3, r2, r4, 30); 493 S6(r0, r1, r3, r2, r4); LK(r3, r4, r1, r2, r0, 31); 494 S7(r3, r4, r1, r2, r0); K(r0, r1, r2, r3, 32); 495 496 d[0] = cpu_to_le32(r0); 497 d[1] = cpu_to_le32(r1); 498 d[2] = cpu_to_le32(r2); 499 d[3] = cpu_to_le32(r3); 500 } 501 EXPORT_SYMBOL_GPL(__serpent_encrypt); 502 503 static void serpent_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) 504 { 505 struct serpent_ctx *ctx = crypto_tfm_ctx(tfm); 506 507 __serpent_encrypt(ctx, dst, src); 508 } 509 510 void __serpent_decrypt(struct serpent_ctx *ctx, u8 *dst, const u8 *src) 511 { 512 const u32 *k = ctx->expkey; 513 const __le32 *s = (const __le32 *)src; 514 __le32 *d = (__le32 *)dst; 515 u32 r0, r1, r2, r3, r4; 516 517 r0 = le32_to_cpu(s[0]); 518 r1 = le32_to_cpu(s[1]); 519 r2 = le32_to_cpu(s[2]); 520 r3 = le32_to_cpu(s[3]); 521 522 K(r0, r1, r2, r3, 32); 523 SI7(r0, r1, r2, r3, r4); KL(r1, r3, r0, r4, r2, 31); 524 SI6(r1, r3, r0, r4, r2); KL(r0, r2, r4, r1, r3, 30); 525 SI5(r0, r2, r4, r1, r3); KL(r2, r3, r0, r4, r1, 29); 526 SI4(r2, r3, r0, r4, r1); KL(r2, r0, r1, r4, r3, 28); 527 SI3(r2, r0, r1, r4, r3); KL(r1, r2, r3, r4, r0, 27); 528 SI2(r1, r2, r3, r4, r0); KL(r2, r0, r4, r3, r1, 26); 529 SI1(r2, r0, r4, r3, r1); KL(r1, r0, r4, r3, r2, 25); 530 SI0(r1, r0, r4, r3, r2); KL(r4, r2, r0, r1, r3, 24); 531 SI7(r4, r2, r0, r1, r3); KL(r2, r1, r4, r3, r0, 23); 532 SI6(r2, r1, r4, r3, r0); KL(r4, r0, r3, r2, r1, 22); 533 SI5(r4, r0, r3, r2, r1); KL(r0, r1, r4, r3, r2, 21); 534 SI4(r0, r1, r4, r3, r2); KL(r0, r4, r2, r3, r1, 20); 535 SI3(r0, r4, r2, r3, r1); KL(r2, r0, r1, r3, r4, 19); 536 SI2(r2, r0, r1, r3, r4); KL(r0, r4, r3, r1, r2, 18); 537 SI1(r0, r4, r3, r1, r2); KL(r2, r4, r3, r1, r0, 17); 538 SI0(r2, r4, r3, r1, r0); KL(r3, r0, r4, r2, r1, 16); 539 SI7(r3, r0, r4, r2, r1); KL(r0, r2, r3, r1, r4, 15); 540 SI6(r0, r2, r3, r1, r4); KL(r3, r4, r1, r0, r2, 14); 541 SI5(r3, r4, r1, r0, r2); KL(r4, r2, r3, r1, r0, 13); 542 SI4(r4, r2, r3, r1, r0); KL(r4, r3, r0, r1, r2, 12); 543 SI3(r4, r3, r0, r1, r2); KL(r0, r4, r2, r1, r3, 11); 544 SI2(r0, r4, r2, r1, r3); KL(r4, r3, r1, r2, r0, 10); 545 SI1(r4, r3, r1, r2, r0); KL(r0, r3, r1, r2, r4, 9); 546 SI0(r0, r3, r1, r2, r4); KL(r1, r4, r3, r0, r2, 8); 547 SI7(r1, r4, r3, r0, r2); KL(r4, r0, r1, r2, r3, 7); 548 SI6(r4, r0, r1, r2, r3); KL(r1, r3, r2, r4, r0, 6); 549 SI5(r1, r3, r2, r4, r0); KL(r3, r0, r1, r2, r4, 5); 550 SI4(r3, r0, r1, r2, r4); KL(r3, r1, r4, r2, r0, 4); 551 SI3(r3, r1, r4, r2, r0); KL(r4, r3, r0, r2, r1, 3); 552 SI2(r4, r3, r0, r2, r1); KL(r3, r1, r2, r0, r4, 2); 553 SI1(r3, r1, r2, r0, r4); KL(r4, r1, r2, r0, r3, 1); 554 SI0(r4, r1, r2, r0, r3); K(r2, r3, r1, r4, 0); 555 556 d[0] = cpu_to_le32(r2); 557 d[1] = cpu_to_le32(r3); 558 d[2] = cpu_to_le32(r1); 559 d[3] = cpu_to_le32(r4); 560 } 561 EXPORT_SYMBOL_GPL(__serpent_decrypt); 562 563 static void serpent_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) 564 { 565 struct serpent_ctx *ctx = crypto_tfm_ctx(tfm); 566 567 __serpent_decrypt(ctx, dst, src); 568 } 569 570 static int tnepres_setkey(struct crypto_tfm *tfm, const u8 *key, 571 unsigned int keylen) 572 { 573 u8 rev_key[SERPENT_MAX_KEY_SIZE]; 574 int i; 575 576 for (i = 0; i < keylen; ++i) 577 rev_key[keylen - i - 1] = key[i]; 578 579 return serpent_setkey(tfm, rev_key, keylen); 580 } 581 582 static void tnepres_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) 583 { 584 const u32 * const s = (const u32 * const)src; 585 u32 * const d = (u32 * const)dst; 586 587 u32 rs[4], rd[4]; 588 589 rs[0] = swab32(s[3]); 590 rs[1] = swab32(s[2]); 591 rs[2] = swab32(s[1]); 592 rs[3] = swab32(s[0]); 593 594 serpent_encrypt(tfm, (u8 *)rd, (u8 *)rs); 595 596 d[0] = swab32(rd[3]); 597 d[1] = swab32(rd[2]); 598 d[2] = swab32(rd[1]); 599 d[3] = swab32(rd[0]); 600 } 601 602 static void tnepres_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src) 603 { 604 const u32 * const s = (const u32 * const)src; 605 u32 * const d = (u32 * const)dst; 606 607 u32 rs[4], rd[4]; 608 609 rs[0] = swab32(s[3]); 610 rs[1] = swab32(s[2]); 611 rs[2] = swab32(s[1]); 612 rs[3] = swab32(s[0]); 613 614 serpent_decrypt(tfm, (u8 *)rd, (u8 *)rs); 615 616 d[0] = swab32(rd[3]); 617 d[1] = swab32(rd[2]); 618 d[2] = swab32(rd[1]); 619 d[3] = swab32(rd[0]); 620 } 621 622 static struct crypto_alg srp_algs[2] = { { 623 .cra_name = "serpent", 624 .cra_driver_name = "serpent-generic", 625 .cra_priority = 100, 626 .cra_flags = CRYPTO_ALG_TYPE_CIPHER, 627 .cra_blocksize = SERPENT_BLOCK_SIZE, 628 .cra_ctxsize = sizeof(struct serpent_ctx), 629 .cra_alignmask = 3, 630 .cra_module = THIS_MODULE, 631 .cra_u = { .cipher = { 632 .cia_min_keysize = SERPENT_MIN_KEY_SIZE, 633 .cia_max_keysize = SERPENT_MAX_KEY_SIZE, 634 .cia_setkey = serpent_setkey, 635 .cia_encrypt = serpent_encrypt, 636 .cia_decrypt = serpent_decrypt } } 637 }, { 638 .cra_name = "tnepres", 639 .cra_flags = CRYPTO_ALG_TYPE_CIPHER, 640 .cra_blocksize = SERPENT_BLOCK_SIZE, 641 .cra_ctxsize = sizeof(struct serpent_ctx), 642 .cra_alignmask = 3, 643 .cra_module = THIS_MODULE, 644 .cra_u = { .cipher = { 645 .cia_min_keysize = SERPENT_MIN_KEY_SIZE, 646 .cia_max_keysize = SERPENT_MAX_KEY_SIZE, 647 .cia_setkey = tnepres_setkey, 648 .cia_encrypt = tnepres_encrypt, 649 .cia_decrypt = tnepres_decrypt } } 650 } }; 651 652 static int __init serpent_mod_init(void) 653 { 654 return crypto_register_algs(srp_algs, ARRAY_SIZE(srp_algs)); 655 } 656 657 static void __exit serpent_mod_fini(void) 658 { 659 crypto_unregister_algs(srp_algs, ARRAY_SIZE(srp_algs)); 660 } 661 662 module_init(serpent_mod_init); 663 module_exit(serpent_mod_fini); 664 665 MODULE_LICENSE("GPL"); 666 MODULE_DESCRIPTION("Serpent and tnepres (kerneli compatible serpent reversed) Cipher Algorithm"); 667 MODULE_AUTHOR("Dag Arne Osvik <osvik@ii.uib.no>"); 668 MODULE_ALIAS_CRYPTO("tnepres"); 669 MODULE_ALIAS_CRYPTO("serpent"); 670 MODULE_ALIAS_CRYPTO("serpent-generic"); 671