Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)
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FreeBSD/Linux Kernel Cross Reference
sys/crypto/serpent.c
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1 /* 2 * Cryptographic API. 3 * 4 * Serpent Cipher Algorithm. 5 * 6 * Copyright (C) 2002 Dag Arne Osvik <osvik@ii.uib.no> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2 of the License, or 11 * (at your option) any later version. 12 */ 13 14 #include <linux/init.h> 15 #include <linux/module.h> 16 #include <linux/errno.h> 17 #include <asm/byteorder.h> 18 #include <linux/crypto.h> 19 20 /* Key is padded to the maximum of 256 bits before round key generation. 21 * Any key length <= 256 bits (32 bytes) is allowed by the algorithm. 22 */ 23 24 #define SERPENT_MIN_KEY_SIZE 0 25 #define SERPENT_MAX_KEY_SIZE 32 26 #define SERPENT_EXPKEY_WORDS 132 27 #define SERPENT_BLOCK_SIZE 16 28 29 #define PHI 0x9e3779b9UL 30 #define ROL(x,r) ((x) = ((x) << (r)) | ((x) >> (32-(r)))) 31 #define ROR(x,r) ((x) = ((x) >> (r)) | ((x) << (32-(r)))) 32 33 #define keyiter(a,b,c,d,i,j) \ 34 b ^= d; b ^= c; b ^= a; b ^= PHI ^ i; ROL(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 K(x0,x1,x2,x3,i) \ 43 x3 ^= k[4*(i)+3]; x2 ^= k[4*(i)+2]; \ 44 x1 ^= k[4*(i)+1]; x0 ^= k[4*(i)+0]; 45 46 #define LK(x0,x1,x2,x3,x4,i) \ 47 ROL(x0,13); \ 48 ROL(x2,3); x1 ^= x0; x4 = x0 << 3; \ 49 x3 ^= x2; x1 ^= x2; \ 50 ROL(x1,1); x3 ^= x4; \ 51 ROL(x3,7); x4 = x1; \ 52 x0 ^= x1; x4 <<= 7; x2 ^= x3; \ 53 x0 ^= x3; x2 ^= x4; x3 ^= k[4*i+3]; \ 54 x1 ^= k[4*i+1]; ROL(x0,5); ROL(x2,22); \ 55 x0 ^= k[4*i+0]; x2 ^= k[4*i+2]; 56 57 #define KL(x0,x1,x2,x3,x4,i) \ 58 x0 ^= k[4*i+0]; x1 ^= k[4*i+1]; x2 ^= k[4*i+2]; \ 59 x3 ^= k[4*i+3]; ROR(x0,5); ROR(x2,22); \ 60 x4 = x1; x2 ^= x3; x0 ^= x3; \ 61 x4 <<= 7; x0 ^= x1; ROR(x1,1); \ 62 x2 ^= x4; ROR(x3,7); x4 = x0 << 3; \ 63 x1 ^= x0; x3 ^= x4; ROR(x0,13); \ 64 x1 ^= x2; x3 ^= x2; ROR(x2,3); 65 66 #define S0(x0,x1,x2,x3,x4) \ 67 x4 = x3; \ 68 x3 |= x0; x0 ^= x4; x4 ^= x2; \ 69 x4 =~ x4; x3 ^= x1; x1 &= x0; \ 70 x1 ^= x4; x2 ^= x0; x0 ^= x3; \ 71 x4 |= x0; x0 ^= x2; x2 &= x1; \ 72 x3 ^= x2; x1 =~ x1; x2 ^= x4; \ 73 x1 ^= x2; 74 75 #define S1(x0,x1,x2,x3,x4) \ 76 x4 = x1; \ 77 x1 ^= x0; x0 ^= x3; x3 =~ x3; \ 78 x4 &= x1; x0 |= x1; x3 ^= x2; \ 79 x0 ^= x3; x1 ^= x3; x3 ^= x4; \ 80 x1 |= x4; x4 ^= x2; x2 &= x0; \ 81 x2 ^= x1; x1 |= x0; x0 =~ x0; \ 82 x0 ^= x2; x4 ^= x1; 83 84 #define S2(x0,x1,x2,x3,x4) \ 85 x3 =~ x3; \ 86 x1 ^= x0; x4 = x0; x0 &= x2; \ 87 x0 ^= x3; x3 |= x4; x2 ^= x1; \ 88 x3 ^= x1; x1 &= x0; x0 ^= x2; \ 89 x2 &= x3; x3 |= x1; x0 =~ x0; \ 90 x3 ^= x0; x4 ^= x0; x0 ^= x2; \ 91 x1 |= x2; 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 #define S4(x0,x1,x2,x3,x4) \ 103 x4 = x3; \ 104 x3 &= x0; x0 ^= x4; \ 105 x3 ^= x2; x2 |= x4; x0 ^= x1; \ 106 x4 ^= x3; x2 |= x0; \ 107 x2 ^= x1; x1 &= x0; \ 108 x1 ^= x4; x4 &= x2; x2 ^= x3; \ 109 x4 ^= x0; x3 |= x1; x1 =~ x1; \ 110 x3 ^= x0; 111 112 #define S5(x0,x1,x2,x3,x4) \ 113 x4 = x1; x1 |= x0; \ 114 x2 ^= x1; x3 =~ x3; x4 ^= x0; \ 115 x0 ^= x2; x1 &= x4; x4 |= x3; \ 116 x4 ^= x0; x0 &= x3; x1 ^= x3; \ 117 x3 ^= x2; x0 ^= x1; x2 &= x4; \ 118 x1 ^= x2; x2 &= x0; \ 119 x3 ^= x2; 120 121 #define S6(x0,x1,x2,x3,x4) \ 122 x4 = x1; \ 123 x3 ^= x0; x1 ^= x2; x2 ^= x0; \ 124 x0 &= x3; x1 |= x3; x4 =~ x4; \ 125 x0 ^= x1; x1 ^= x2; \ 126 x3 ^= x4; x4 ^= x0; x2 &= x0; \ 127 x4 ^= x1; x2 ^= x3; x3 &= x1; \ 128 x3 ^= x0; x1 ^= x2; 129 130 #define S7(x0,x1,x2,x3,x4) \ 131 x1 =~ x1; \ 132 x4 = x1; x0 =~ x0; x1 &= x2; \ 133 x1 ^= x3; x3 |= x4; x4 ^= x2; \ 134 x2 ^= x3; x3 ^= x0; x0 |= x1; \ 135 x2 &= x0; x0 ^= x4; x4 ^= x3; \ 136 x3 &= x0; x4 ^= x1; \ 137 x2 ^= x4; x3 ^= x1; x4 |= x0; \ 138 x4 ^= x1; 139 140 #define SI0(x0,x1,x2,x3,x4) \ 141 x4 = x3; x1 ^= x0; \ 142 x3 |= x1; x4 ^= x1; x0 =~ x0; \ 143 x2 ^= x3; x3 ^= x0; x0 &= x1; \ 144 x0 ^= x2; x2 &= x3; x3 ^= x4; \ 145 x2 ^= x3; x1 ^= x3; x3 &= x0; \ 146 x1 ^= x0; x0 ^= x2; x4 ^= x3; 147 148 #define SI1(x0,x1,x2,x3,x4) \ 149 x1 ^= x3; x4 = x0; \ 150 x0 ^= x2; x2 =~ x2; x4 |= x1; \ 151 x4 ^= x3; x3 &= x1; x1 ^= x2; \ 152 x2 &= x4; x4 ^= x1; x1 |= x3; \ 153 x3 ^= x0; x2 ^= x0; x0 |= x4; \ 154 x2 ^= x4; x1 ^= x0; \ 155 x4 ^= x1; 156 157 #define SI2(x0,x1,x2,x3,x4) \ 158 x2 ^= x1; x4 = x3; x3 =~ x3; \ 159 x3 |= x2; x2 ^= x4; x4 ^= x0; \ 160 x3 ^= x1; x1 |= x2; x2 ^= x0; \ 161 x1 ^= x4; x4 |= x3; x2 ^= x3; \ 162 x4 ^= x2; x2 &= x1; \ 163 x2 ^= x3; x3 ^= x4; x4 ^= x0; 164 165 #define SI3(x0,x1,x2,x3,x4) \ 166 x2 ^= x1; \ 167 x4 = x1; x1 &= x2; \ 168 x1 ^= x0; x0 |= x4; x4 ^= x3; \ 169 x0 ^= x3; x3 |= x1; x1 ^= x2; \ 170 x1 ^= x3; x0 ^= x2; x2 ^= x3; \ 171 x3 &= x1; x1 ^= x0; x0 &= x2; \ 172 x4 ^= x3; x3 ^= x0; x0 ^= x1; 173 174 #define SI4(x0,x1,x2,x3,x4) \ 175 x2 ^= x3; x4 = x0; x0 &= x1; \ 176 x0 ^= x2; x2 |= x3; x4 =~ x4; \ 177 x1 ^= x0; x0 ^= x2; x2 &= x4; \ 178 x2 ^= x0; x0 |= x4; \ 179 x0 ^= x3; x3 &= x2; \ 180 x4 ^= x3; x3 ^= x1; x1 &= x0; \ 181 x4 ^= x1; x0 ^= x3; 182 183 #define SI5(x0,x1,x2,x3,x4) \ 184 x4 = x1; x1 |= x2; \ 185 x2 ^= x4; x1 ^= x3; x3 &= x4; \ 186 x2 ^= x3; x3 |= x0; x0 =~ x0; \ 187 x3 ^= x2; x2 |= x0; x4 ^= x1; \ 188 x2 ^= x4; x4 &= x0; x0 ^= x1; \ 189 x1 ^= x3; x0 &= x2; x2 ^= x3; \ 190 x0 ^= x2; x2 ^= x4; x4 ^= x3; 191 192 #define SI6(x0,x1,x2,x3,x4) \ 193 x0 ^= x2; \ 194 x4 = x0; x0 &= x3; x2 ^= x3; \ 195 x0 ^= x2; x3 ^= x1; x2 |= x4; \ 196 x2 ^= x3; x3 &= x0; x0 =~ x0; \ 197 x3 ^= x1; x1 &= x2; x4 ^= x0; \ 198 x3 ^= x4; x4 ^= x2; x0 ^= x1; \ 199 x2 ^= x0; 200 201 #define SI7(x0,x1,x2,x3,x4) \ 202 x4 = x3; x3 &= x0; x0 ^= x2; \ 203 x2 |= x4; x4 ^= x1; x0 =~ x0; \ 204 x1 |= x3; x4 ^= x0; x0 &= x2; \ 205 x0 ^= x1; x1 &= x2; x3 ^= x2; \ 206 x4 ^= x3; x2 &= x3; x3 |= x0; \ 207 x1 ^= x4; x3 ^= x4; x4 &= x0; \ 208 x4 ^= x2; 209 210 struct serpent_ctx { 211 u8 iv[SERPENT_BLOCK_SIZE]; 212 u32 expkey[SERPENT_EXPKEY_WORDS]; 213 }; 214 215 static int setkey(void *ctx, const u8 *key, unsigned int keylen, u32 *flags) 216 { 217 u32 *k = ((struct serpent_ctx *)ctx)->expkey; 218 u8 *k8 = (u8 *)k; 219 u32 r0,r1,r2,r3,r4; 220 int i; 221 222 if ((keylen < SERPENT_MIN_KEY_SIZE) 223 || (keylen > SERPENT_MAX_KEY_SIZE)) 224 { 225 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN; 226 return -EINVAL; 227 } 228 229 /* Copy key, add padding */ 230 231 for (i = 0; i < keylen; ++i) 232 k8[i] = key[i]; 233 if (i < SERPENT_MAX_KEY_SIZE) 234 k8[i++] = 1; 235 while (i < SERPENT_MAX_KEY_SIZE) 236 k8[i++] = 0; 237 238 /* Expand key using polynomial */ 239 240 r0 = le32_to_cpu(k[3]); 241 r1 = le32_to_cpu(k[4]); 242 r2 = le32_to_cpu(k[5]); 243 r3 = le32_to_cpu(k[6]); 244 r4 = le32_to_cpu(k[7]); 245 246 keyiter(le32_to_cpu(k[0]),r0,r4,r2,0,0); 247 keyiter(le32_to_cpu(k[1]),r1,r0,r3,1,1); 248 keyiter(le32_to_cpu(k[2]),r2,r1,r4,2,2); 249 keyiter(le32_to_cpu(k[3]),r3,r2,r0,3,3); 250 keyiter(le32_to_cpu(k[4]),r4,r3,r1,4,4); 251 keyiter(le32_to_cpu(k[5]),r0,r4,r2,5,5); 252 keyiter(le32_to_cpu(k[6]),r1,r0,r3,6,6); 253 keyiter(le32_to_cpu(k[7]),r2,r1,r4,7,7); 254 255 keyiter(k[ 0],r3,r2,r0, 8, 8); keyiter(k[ 1],r4,r3,r1, 9, 9); 256 keyiter(k[ 2],r0,r4,r2, 10, 10); keyiter(k[ 3],r1,r0,r3, 11, 11); 257 keyiter(k[ 4],r2,r1,r4, 12, 12); keyiter(k[ 5],r3,r2,r0, 13, 13); 258 keyiter(k[ 6],r4,r3,r1, 14, 14); keyiter(k[ 7],r0,r4,r2, 15, 15); 259 keyiter(k[ 8],r1,r0,r3, 16, 16); keyiter(k[ 9],r2,r1,r4, 17, 17); 260 keyiter(k[ 10],r3,r2,r0, 18, 18); keyiter(k[ 11],r4,r3,r1, 19, 19); 261 keyiter(k[ 12],r0,r4,r2, 20, 20); keyiter(k[ 13],r1,r0,r3, 21, 21); 262 keyiter(k[ 14],r2,r1,r4, 22, 22); keyiter(k[ 15],r3,r2,r0, 23, 23); 263 keyiter(k[ 16],r4,r3,r1, 24, 24); keyiter(k[ 17],r0,r4,r2, 25, 25); 264 keyiter(k[ 18],r1,r0,r3, 26, 26); keyiter(k[ 19],r2,r1,r4, 27, 27); 265 keyiter(k[ 20],r3,r2,r0, 28, 28); keyiter(k[ 21],r4,r3,r1, 29, 29); 266 keyiter(k[ 22],r0,r4,r2, 30, 30); keyiter(k[ 23],r1,r0,r3, 31, 31); 267 268 k += 50; 269 270 keyiter(k[-26],r2,r1,r4, 32,-18); keyiter(k[-25],r3,r2,r0, 33,-17); 271 keyiter(k[-24],r4,r3,r1, 34,-16); keyiter(k[-23],r0,r4,r2, 35,-15); 272 keyiter(k[-22],r1,r0,r3, 36,-14); keyiter(k[-21],r2,r1,r4, 37,-13); 273 keyiter(k[-20],r3,r2,r0, 38,-12); keyiter(k[-19],r4,r3,r1, 39,-11); 274 keyiter(k[-18],r0,r4,r2, 40,-10); keyiter(k[-17],r1,r0,r3, 41, -9); 275 keyiter(k[-16],r2,r1,r4, 42, -8); keyiter(k[-15],r3,r2,r0, 43, -7); 276 keyiter(k[-14],r4,r3,r1, 44, -6); keyiter(k[-13],r0,r4,r2, 45, -5); 277 keyiter(k[-12],r1,r0,r3, 46, -4); keyiter(k[-11],r2,r1,r4, 47, -3); 278 keyiter(k[-10],r3,r2,r0, 48, -2); keyiter(k[ -9],r4,r3,r1, 49, -1); 279 keyiter(k[ -8],r0,r4,r2, 50, 0); keyiter(k[ -7],r1,r0,r3, 51, 1); 280 keyiter(k[ -6],r2,r1,r4, 52, 2); keyiter(k[ -5],r3,r2,r0, 53, 3); 281 keyiter(k[ -4],r4,r3,r1, 54, 4); keyiter(k[ -3],r0,r4,r2, 55, 5); 282 keyiter(k[ -2],r1,r0,r3, 56, 6); keyiter(k[ -1],r2,r1,r4, 57, 7); 283 keyiter(k[ 0],r3,r2,r0, 58, 8); keyiter(k[ 1],r4,r3,r1, 59, 9); 284 keyiter(k[ 2],r0,r4,r2, 60, 10); keyiter(k[ 3],r1,r0,r3, 61, 11); 285 keyiter(k[ 4],r2,r1,r4, 62, 12); keyiter(k[ 5],r3,r2,r0, 63, 13); 286 keyiter(k[ 6],r4,r3,r1, 64, 14); keyiter(k[ 7],r0,r4,r2, 65, 15); 287 keyiter(k[ 8],r1,r0,r3, 66, 16); keyiter(k[ 9],r2,r1,r4, 67, 17); 288 keyiter(k[ 10],r3,r2,r0, 68, 18); keyiter(k[ 11],r4,r3,r1, 69, 19); 289 keyiter(k[ 12],r0,r4,r2, 70, 20); keyiter(k[ 13],r1,r0,r3, 71, 21); 290 keyiter(k[ 14],r2,r1,r4, 72, 22); keyiter(k[ 15],r3,r2,r0, 73, 23); 291 keyiter(k[ 16],r4,r3,r1, 74, 24); keyiter(k[ 17],r0,r4,r2, 75, 25); 292 keyiter(k[ 18],r1,r0,r3, 76, 26); keyiter(k[ 19],r2,r1,r4, 77, 27); 293 keyiter(k[ 20],r3,r2,r0, 78, 28); keyiter(k[ 21],r4,r3,r1, 79, 29); 294 keyiter(k[ 22],r0,r4,r2, 80, 30); keyiter(k[ 23],r1,r0,r3, 81, 31); 295 296 k += 50; 297 298 keyiter(k[-26],r2,r1,r4, 82,-18); keyiter(k[-25],r3,r2,r0, 83,-17); 299 keyiter(k[-24],r4,r3,r1, 84,-16); keyiter(k[-23],r0,r4,r2, 85,-15); 300 keyiter(k[-22],r1,r0,r3, 86,-14); keyiter(k[-21],r2,r1,r4, 87,-13); 301 keyiter(k[-20],r3,r2,r0, 88,-12); keyiter(k[-19],r4,r3,r1, 89,-11); 302 keyiter(k[-18],r0,r4,r2, 90,-10); keyiter(k[-17],r1,r0,r3, 91, -9); 303 keyiter(k[-16],r2,r1,r4, 92, -8); keyiter(k[-15],r3,r2,r0, 93, -7); 304 keyiter(k[-14],r4,r3,r1, 94, -6); keyiter(k[-13],r0,r4,r2, 95, -5); 305 keyiter(k[-12],r1,r0,r3, 96, -4); keyiter(k[-11],r2,r1,r4, 97, -3); 306 keyiter(k[-10],r3,r2,r0, 98, -2); keyiter(k[ -9],r4,r3,r1, 99, -1); 307 keyiter(k[ -8],r0,r4,r2,100, 0); keyiter(k[ -7],r1,r0,r3,101, 1); 308 keyiter(k[ -6],r2,r1,r4,102, 2); keyiter(k[ -5],r3,r2,r0,103, 3); 309 keyiter(k[ -4],r4,r3,r1,104, 4); keyiter(k[ -3],r0,r4,r2,105, 5); 310 keyiter(k[ -2],r1,r0,r3,106, 6); keyiter(k[ -1],r2,r1,r4,107, 7); 311 keyiter(k[ 0],r3,r2,r0,108, 8); keyiter(k[ 1],r4,r3,r1,109, 9); 312 keyiter(k[ 2],r0,r4,r2,110, 10); keyiter(k[ 3],r1,r0,r3,111, 11); 313 keyiter(k[ 4],r2,r1,r4,112, 12); keyiter(k[ 5],r3,r2,r0,113, 13); 314 keyiter(k[ 6],r4,r3,r1,114, 14); keyiter(k[ 7],r0,r4,r2,115, 15); 315 keyiter(k[ 8],r1,r0,r3,116, 16); keyiter(k[ 9],r2,r1,r4,117, 17); 316 keyiter(k[ 10],r3,r2,r0,118, 18); keyiter(k[ 11],r4,r3,r1,119, 19); 317 keyiter(k[ 12],r0,r4,r2,120, 20); keyiter(k[ 13],r1,r0,r3,121, 21); 318 keyiter(k[ 14],r2,r1,r4,122, 22); keyiter(k[ 15],r3,r2,r0,123, 23); 319 keyiter(k[ 16],r4,r3,r1,124, 24); keyiter(k[ 17],r0,r4,r2,125, 25); 320 keyiter(k[ 18],r1,r0,r3,126, 26); keyiter(k[ 19],r2,r1,r4,127, 27); 321 keyiter(k[ 20],r3,r2,r0,128, 28); keyiter(k[ 21],r4,r3,r1,129, 29); 322 keyiter(k[ 22],r0,r4,r2,130, 30); keyiter(k[ 23],r1,r0,r3,131, 31); 323 324 /* Apply S-boxes */ 325 326 S3(r3,r4,r0,r1,r2); storekeys(r1,r2,r4,r3, 28); loadkeys(r1,r2,r4,r3, 24); 327 S4(r1,r2,r4,r3,r0); storekeys(r2,r4,r3,r0, 24); loadkeys(r2,r4,r3,r0, 20); 328 S5(r2,r4,r3,r0,r1); storekeys(r1,r2,r4,r0, 20); loadkeys(r1,r2,r4,r0, 16); 329 S6(r1,r2,r4,r0,r3); storekeys(r4,r3,r2,r0, 16); loadkeys(r4,r3,r2,r0, 12); 330 S7(r4,r3,r2,r0,r1); storekeys(r1,r2,r0,r4, 12); loadkeys(r1,r2,r0,r4, 8); 331 S0(r1,r2,r0,r4,r3); storekeys(r0,r2,r4,r1, 8); loadkeys(r0,r2,r4,r1, 4); 332 S1(r0,r2,r4,r1,r3); storekeys(r3,r4,r1,r0, 4); loadkeys(r3,r4,r1,r0, 0); 333 S2(r3,r4,r1,r0,r2); storekeys(r2,r4,r3,r0, 0); loadkeys(r2,r4,r3,r0, -4); 334 S3(r2,r4,r3,r0,r1); storekeys(r0,r1,r4,r2, -4); loadkeys(r0,r1,r4,r2, -8); 335 S4(r0,r1,r4,r2,r3); storekeys(r1,r4,r2,r3, -8); loadkeys(r1,r4,r2,r3,-12); 336 S5(r1,r4,r2,r3,r0); storekeys(r0,r1,r4,r3,-12); loadkeys(r0,r1,r4,r3,-16); 337 S6(r0,r1,r4,r3,r2); storekeys(r4,r2,r1,r3,-16); loadkeys(r4,r2,r1,r3,-20); 338 S7(r4,r2,r1,r3,r0); storekeys(r0,r1,r3,r4,-20); loadkeys(r0,r1,r3,r4,-24); 339 S0(r0,r1,r3,r4,r2); storekeys(r3,r1,r4,r0,-24); loadkeys(r3,r1,r4,r0,-28); 340 k -= 50; 341 S1(r3,r1,r4,r0,r2); storekeys(r2,r4,r0,r3, 22); loadkeys(r2,r4,r0,r3, 18); 342 S2(r2,r4,r0,r3,r1); storekeys(r1,r4,r2,r3, 18); loadkeys(r1,r4,r2,r3, 14); 343 S3(r1,r4,r2,r3,r0); storekeys(r3,r0,r4,r1, 14); loadkeys(r3,r0,r4,r1, 10); 344 S4(r3,r0,r4,r1,r2); storekeys(r0,r4,r1,r2, 10); loadkeys(r0,r4,r1,r2, 6); 345 S5(r0,r4,r1,r2,r3); storekeys(r3,r0,r4,r2, 6); loadkeys(r3,r0,r4,r2, 2); 346 S6(r3,r0,r4,r2,r1); storekeys(r4,r1,r0,r2, 2); loadkeys(r4,r1,r0,r2, -2); 347 S7(r4,r1,r0,r2,r3); storekeys(r3,r0,r2,r4, -2); loadkeys(r3,r0,r2,r4, -6); 348 S0(r3,r0,r2,r4,r1); storekeys(r2,r0,r4,r3, -6); loadkeys(r2,r0,r4,r3,-10); 349 S1(r2,r0,r4,r3,r1); storekeys(r1,r4,r3,r2,-10); loadkeys(r1,r4,r3,r2,-14); 350 S2(r1,r4,r3,r2,r0); storekeys(r0,r4,r1,r2,-14); loadkeys(r0,r4,r1,r2,-18); 351 S3(r0,r4,r1,r2,r3); storekeys(r2,r3,r4,r0,-18); loadkeys(r2,r3,r4,r0,-22); 352 k -= 50; 353 S4(r2,r3,r4,r0,r1); storekeys(r3,r4,r0,r1, 28); loadkeys(r3,r4,r0,r1, 24); 354 S5(r3,r4,r0,r1,r2); storekeys(r2,r3,r4,r1, 24); loadkeys(r2,r3,r4,r1, 20); 355 S6(r2,r3,r4,r1,r0); storekeys(r4,r0,r3,r1, 20); loadkeys(r4,r0,r3,r1, 16); 356 S7(r4,r0,r3,r1,r2); storekeys(r2,r3,r1,r4, 16); loadkeys(r2,r3,r1,r4, 12); 357 S0(r2,r3,r1,r4,r0); storekeys(r1,r3,r4,r2, 12); loadkeys(r1,r3,r4,r2, 8); 358 S1(r1,r3,r4,r2,r0); storekeys(r0,r4,r2,r1, 8); loadkeys(r0,r4,r2,r1, 4); 359 S2(r0,r4,r2,r1,r3); storekeys(r3,r4,r0,r1, 4); loadkeys(r3,r4,r0,r1, 0); 360 S3(r3,r4,r0,r1,r2); storekeys(r1,r2,r4,r3, 0); 361 362 return 0; 363 } 364 365 static void encrypt(void *ctx, u8 *dst, const u8 *src) 366 { 367 const u32 368 *k = ((struct serpent_ctx *)ctx)->expkey, 369 *s = (const u32 *)src; 370 u32 *d = (u32 *)dst, 371 r0, r1, r2, r3, r4; 372 373 /* 374 * Note: The conversions between u8* and u32* might cause trouble 375 * on architectures with stricter alignment rules than x86 376 */ 377 378 r0 = le32_to_cpu(s[0]); 379 r1 = le32_to_cpu(s[1]); 380 r2 = le32_to_cpu(s[2]); 381 r3 = le32_to_cpu(s[3]); 382 383 K(r0,r1,r2,r3,0); 384 S0(r0,r1,r2,r3,r4); LK(r2,r1,r3,r0,r4,1); 385 S1(r2,r1,r3,r0,r4); LK(r4,r3,r0,r2,r1,2); 386 S2(r4,r3,r0,r2,r1); LK(r1,r3,r4,r2,r0,3); 387 S3(r1,r3,r4,r2,r0); LK(r2,r0,r3,r1,r4,4); 388 S4(r2,r0,r3,r1,r4); LK(r0,r3,r1,r4,r2,5); 389 S5(r0,r3,r1,r4,r2); LK(r2,r0,r3,r4,r1,6); 390 S6(r2,r0,r3,r4,r1); LK(r3,r1,r0,r4,r2,7); 391 S7(r3,r1,r0,r4,r2); LK(r2,r0,r4,r3,r1,8); 392 S0(r2,r0,r4,r3,r1); LK(r4,r0,r3,r2,r1,9); 393 S1(r4,r0,r3,r2,r1); LK(r1,r3,r2,r4,r0,10); 394 S2(r1,r3,r2,r4,r0); LK(r0,r3,r1,r4,r2,11); 395 S3(r0,r3,r1,r4,r2); LK(r4,r2,r3,r0,r1,12); 396 S4(r4,r2,r3,r0,r1); LK(r2,r3,r0,r1,r4,13); 397 S5(r2,r3,r0,r1,r4); LK(r4,r2,r3,r1,r0,14); 398 S6(r4,r2,r3,r1,r0); LK(r3,r0,r2,r1,r4,15); 399 S7(r3,r0,r2,r1,r4); LK(r4,r2,r1,r3,r0,16); 400 S0(r4,r2,r1,r3,r0); LK(r1,r2,r3,r4,r0,17); 401 S1(r1,r2,r3,r4,r0); LK(r0,r3,r4,r1,r2,18); 402 S2(r0,r3,r4,r1,r2); LK(r2,r3,r0,r1,r4,19); 403 S3(r2,r3,r0,r1,r4); LK(r1,r4,r3,r2,r0,20); 404 S4(r1,r4,r3,r2,r0); LK(r4,r3,r2,r0,r1,21); 405 S5(r4,r3,r2,r0,r1); LK(r1,r4,r3,r0,r2,22); 406 S6(r1,r4,r3,r0,r2); LK(r3,r2,r4,r0,r1,23); 407 S7(r3,r2,r4,r0,r1); LK(r1,r4,r0,r3,r2,24); 408 S0(r1,r4,r0,r3,r2); LK(r0,r4,r3,r1,r2,25); 409 S1(r0,r4,r3,r1,r2); LK(r2,r3,r1,r0,r4,26); 410 S2(r2,r3,r1,r0,r4); LK(r4,r3,r2,r0,r1,27); 411 S3(r4,r3,r2,r0,r1); LK(r0,r1,r3,r4,r2,28); 412 S4(r0,r1,r3,r4,r2); LK(r1,r3,r4,r2,r0,29); 413 S5(r1,r3,r4,r2,r0); LK(r0,r1,r3,r2,r4,30); 414 S6(r0,r1,r3,r2,r4); LK(r3,r4,r1,r2,r0,31); 415 S7(r3,r4,r1,r2,r0); K(r0,r1,r2,r3,32); 416 417 d[0] = cpu_to_le32(r0); 418 d[1] = cpu_to_le32(r1); 419 d[2] = cpu_to_le32(r2); 420 d[3] = cpu_to_le32(r3); 421 } 422 423 static void decrypt(void *ctx, u8 *dst, const u8 *src) 424 { 425 const u32 426 *k = ((struct serpent_ctx *)ctx)->expkey, 427 *s = (const u32 *)src; 428 u32 *d = (u32 *)dst, 429 r0, r1, r2, r3, r4; 430 431 r0 = le32_to_cpu(s[0]); 432 r1 = le32_to_cpu(s[1]); 433 r2 = le32_to_cpu(s[2]); 434 r3 = le32_to_cpu(s[3]); 435 436 K(r0,r1,r2,r3,32); 437 SI7(r0,r1,r2,r3,r4); KL(r1,r3,r0,r4,r2,31); 438 SI6(r1,r3,r0,r4,r2); KL(r0,r2,r4,r1,r3,30); 439 SI5(r0,r2,r4,r1,r3); KL(r2,r3,r0,r4,r1,29); 440 SI4(r2,r3,r0,r4,r1); KL(r2,r0,r1,r4,r3,28); 441 SI3(r2,r0,r1,r4,r3); KL(r1,r2,r3,r4,r0,27); 442 SI2(r1,r2,r3,r4,r0); KL(r2,r0,r4,r3,r1,26); 443 SI1(r2,r0,r4,r3,r1); KL(r1,r0,r4,r3,r2,25); 444 SI0(r1,r0,r4,r3,r2); KL(r4,r2,r0,r1,r3,24); 445 SI7(r4,r2,r0,r1,r3); KL(r2,r1,r4,r3,r0,23); 446 SI6(r2,r1,r4,r3,r0); KL(r4,r0,r3,r2,r1,22); 447 SI5(r4,r0,r3,r2,r1); KL(r0,r1,r4,r3,r2,21); 448 SI4(r0,r1,r4,r3,r2); KL(r0,r4,r2,r3,r1,20); 449 SI3(r0,r4,r2,r3,r1); KL(r2,r0,r1,r3,r4,19); 450 SI2(r2,r0,r1,r3,r4); KL(r0,r4,r3,r1,r2,18); 451 SI1(r0,r4,r3,r1,r2); KL(r2,r4,r3,r1,r0,17); 452 SI0(r2,r4,r3,r1,r0); KL(r3,r0,r4,r2,r1,16); 453 SI7(r3,r0,r4,r2,r1); KL(r0,r2,r3,r1,r4,15); 454 SI6(r0,r2,r3,r1,r4); KL(r3,r4,r1,r0,r2,14); 455 SI5(r3,r4,r1,r0,r2); KL(r4,r2,r3,r1,r0,13); 456 SI4(r4,r2,r3,r1,r0); KL(r4,r3,r0,r1,r2,12); 457 SI3(r4,r3,r0,r1,r2); KL(r0,r4,r2,r1,r3,11); 458 SI2(r0,r4,r2,r1,r3); KL(r4,r3,r1,r2,r0,10); 459 SI1(r4,r3,r1,r2,r0); KL(r0,r3,r1,r2,r4,9); 460 SI0(r0,r3,r1,r2,r4); KL(r1,r4,r3,r0,r2,8); 461 SI7(r1,r4,r3,r0,r2); KL(r4,r0,r1,r2,r3,7); 462 SI6(r4,r0,r1,r2,r3); KL(r1,r3,r2,r4,r0,6); 463 SI5(r1,r3,r2,r4,r0); KL(r3,r0,r1,r2,r4,5); 464 SI4(r3,r0,r1,r2,r4); KL(r3,r1,r4,r2,r0,4); 465 SI3(r3,r1,r4,r2,r0); KL(r4,r3,r0,r2,r1,3); 466 SI2(r4,r3,r0,r2,r1); KL(r3,r1,r2,r0,r4,2); 467 SI1(r3,r1,r2,r0,r4); KL(r4,r1,r2,r0,r3,1); 468 SI0(r4,r1,r2,r0,r3); K(r2,r3,r1,r4,0); 469 470 d[0] = cpu_to_le32(r2); 471 d[1] = cpu_to_le32(r3); 472 d[2] = cpu_to_le32(r1); 473 d[3] = cpu_to_le32(r4); 474 } 475 476 static struct crypto_alg serpent_alg = { 477 .cra_name = "serpent", 478 .cra_flags = CRYPTO_ALG_TYPE_CIPHER, 479 .cra_blocksize = SERPENT_BLOCK_SIZE, 480 .cra_ctxsize = sizeof(struct serpent_ctx), 481 .cra_module = THIS_MODULE, 482 .cra_list = LIST_HEAD_INIT(serpent_alg.cra_list), 483 .cra_u = { .cipher = { 484 .cia_min_keysize = SERPENT_MIN_KEY_SIZE, 485 .cia_max_keysize = SERPENT_MAX_KEY_SIZE, 486 .cia_ivsize = SERPENT_BLOCK_SIZE, 487 .cia_setkey = setkey, 488 .cia_encrypt = encrypt, 489 .cia_decrypt = decrypt } } 490 }; 491 492 static int __init init(void) 493 { 494 return crypto_register_alg(&serpent_alg); 495 } 496 497 static void __exit fini(void) 498 { 499 crypto_unregister_alg(&serpent_alg); 500 } 501 502 module_init(init); 503 module_exit(fini); 504 505 MODULE_LICENSE("GPL"); 506 MODULE_DESCRIPTION("Serpent Cipher Algorithm"); 507 MODULE_AUTHOR("Dag Arne Osvik <osvik@ii.uib.no>");
Cache object: 750da8d9b3c1445193c61add96e0c84f
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