1 /* Copyright (C) 1995-1998 Eric Young (eay (at) cryptsoft.com) 2 * All rights reserved. 3 * 4 * This package is an SSL implementation written 5 * by Eric Young (eay (at) cryptsoft.com). 6 * The implementation was written so as to conform with Netscapes SSL. 7 * 8 * This library is free for commercial and non-commercial use as long as 9 * the following conditions are aheared to. The following conditions 10 * apply to all code found in this distribution, be it the RC4, RSA, 11 * lhash, DES, etc., code; not just the SSL code. The SSL documentation 12 * included with this distribution is covered by the same copyright terms 13 * except that the holder is Tim Hudson (tjh (at) cryptsoft.com). 14 * 15 * Copyright remains Eric Young's, and as such any Copyright notices in 16 * the code are not to be removed. 17 * If this package is used in a product, Eric Young should be given attribution 18 * as the author of the parts of the library used. 19 * This can be in the form of a textual message at program startup or 20 * in documentation (online or textual) provided with the package. 21 * 22 * Redistribution and use in source and binary forms, with or without 23 * modification, are permitted provided that the following conditions 24 * are met: 25 * 1. Redistributions of source code must retain the copyright 26 * notice, this list of conditions and the following disclaimer. 27 * 2. Redistributions in binary form must reproduce the above copyright 28 * notice, this list of conditions and the following disclaimer in the 29 * documentation and/or other materials provided with the distribution. 30 * 3. All advertising materials mentioning features or use of this software 31 * must display the following acknowledgement: 32 * "This product includes cryptographic software written by 33 * Eric Young (eay (at) cryptsoft.com)" 34 * The word 'cryptographic' can be left out if the rouines from the library 35 * being used are not cryptographic related :-). 36 * 4. If you include any Windows specific code (or a derivative thereof) from 37 * the apps directory (application code) you must include an acknowledgement: 38 * "This product includes software written by Tim Hudson (tjh (at) cryptsoft.com)" 39 * 40 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND 41 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 43 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 44 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 45 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 46 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 47 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 48 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 49 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 50 * SUCH DAMAGE. 51 * 52 * The licence and distribution terms for any publically available version or 53 * derivative of this code cannot be changed. i.e. this code cannot simply be 54 * copied and put under another distribution licence 55 * [including the GNU Public Licence.] */ 56 57 #include <openssl/cipher.h> 58 #include <openssl/nid.h> 59 60 #include "../internal.h" 61 62 63 #define c2l(c, l) \ 64 do { \ 65 (l) = ((uint32_t)(*((c)++))); \ 66 (l) |= ((uint32_t)(*((c)++))) << 8L; \ 67 (l) |= ((uint32_t)(*((c)++))) << 16L; \ 68 (l) |= ((uint32_t)(*((c)++))) << 24L; \ 69 } while (0) 70 71 #define c2ln(c, l1, l2, n) \ 72 do { \ 73 (c) += (n); \ 74 (l1) = (l2) = 0; \ 75 switch (n) { \ 76 case 8: \ 77 (l2) = ((uint32_t)(*(--(c)))) << 24L; \ 78 OPENSSL_FALLTHROUGH; \ 79 case 7: \ 80 (l2) |= ((uint32_t)(*(--(c)))) << 16L; \ 81 OPENSSL_FALLTHROUGH; \ 82 case 6: \ 83 (l2) |= ((uint32_t)(*(--(c)))) << 8L; \ 84 OPENSSL_FALLTHROUGH; \ 85 case 5: \ 86 (l2) |= ((uint32_t)(*(--(c)))); \ 87 OPENSSL_FALLTHROUGH; \ 88 case 4: \ 89 (l1) = ((uint32_t)(*(--(c)))) << 24L; \ 90 OPENSSL_FALLTHROUGH; \ 91 case 3: \ 92 (l1) |= ((uint32_t)(*(--(c)))) << 16L; \ 93 OPENSSL_FALLTHROUGH; \ 94 case 2: \ 95 (l1) |= ((uint32_t)(*(--(c)))) << 8L; \ 96 OPENSSL_FALLTHROUGH; \ 97 case 1: \ 98 (l1) |= ((uint32_t)(*(--(c)))); \ 99 } \ 100 } while (0) 101 102 #define l2c(l, c) \ 103 do { \ 104 *((c)++) = (uint8_t)(((l)) & 0xff); \ 105 *((c)++) = (uint8_t)(((l) >> 8L) & 0xff); \ 106 *((c)++) = (uint8_t)(((l) >> 16L) & 0xff); \ 107 *((c)++) = (uint8_t)(((l) >> 24L) & 0xff); \ 108 } while (0) 109 110 #define l2cn(l1, l2, c, n) \ 111 do { \ 112 (c) += (n); \ 113 switch (n) { \ 114 case 8: \ 115 *(--(c)) = (uint8_t)(((l2) >> 24L) & 0xff); \ 116 OPENSSL_FALLTHROUGH; \ 117 case 7: \ 118 *(--(c)) = (uint8_t)(((l2) >> 16L) & 0xff); \ 119 OPENSSL_FALLTHROUGH; \ 120 case 6: \ 121 *(--(c)) = (uint8_t)(((l2) >> 8L) & 0xff); \ 122 OPENSSL_FALLTHROUGH; \ 123 case 5: \ 124 *(--(c)) = (uint8_t)(((l2)) & 0xff); \ 125 OPENSSL_FALLTHROUGH; \ 126 case 4: \ 127 *(--(c)) = (uint8_t)(((l1) >> 24L) & 0xff); \ 128 OPENSSL_FALLTHROUGH; \ 129 case 3: \ 130 *(--(c)) = (uint8_t)(((l1) >> 16L) & 0xff); \ 131 OPENSSL_FALLTHROUGH; \ 132 case 2: \ 133 *(--(c)) = (uint8_t)(((l1) >> 8L) & 0xff); \ 134 OPENSSL_FALLTHROUGH; \ 135 case 1: \ 136 *(--(c)) = (uint8_t)(((l1)) & 0xff); \ 137 } \ 138 } while (0) 139 140 typedef struct rc2_key_st { uint16_t data[64]; } RC2_KEY; 141 142 static void RC2_encrypt(uint32_t *d, RC2_KEY *key) { 143 int i, n; 144 uint16_t *p0, *p1; 145 uint16_t x0, x1, x2, x3, t; 146 uint32_t l; 147 148 l = d[0]; 149 x0 = (uint16_t)l & 0xffff; 150 x1 = (uint16_t)(l >> 16L); 151 l = d[1]; 152 x2 = (uint16_t)l & 0xffff; 153 x3 = (uint16_t)(l >> 16L); 154 155 n = 3; 156 i = 5; 157 158 p0 = p1 = &key->data[0]; 159 for (;;) { 160 t = (x0 + (x1 & ~x3) + (x2 & x3) + *(p0++)) & 0xffff; 161 x0 = (t << 1) | (t >> 15); 162 t = (x1 + (x2 & ~x0) + (x3 & x0) + *(p0++)) & 0xffff; 163 x1 = (t << 2) | (t >> 14); 164 t = (x2 + (x3 & ~x1) + (x0 & x1) + *(p0++)) & 0xffff; 165 x2 = (t << 3) | (t >> 13); 166 t = (x3 + (x0 & ~x2) + (x1 & x2) + *(p0++)) & 0xffff; 167 x3 = (t << 5) | (t >> 11); 168 169 if (--i == 0) { 170 if (--n == 0) { 171 break; 172 } 173 i = (n == 2) ? 6 : 5; 174 175 x0 += p1[x3 & 0x3f]; 176 x1 += p1[x0 & 0x3f]; 177 x2 += p1[x1 & 0x3f]; 178 x3 += p1[x2 & 0x3f]; 179 } 180 } 181 182 d[0] = (uint32_t)(x0 & 0xffff) | ((uint32_t)(x1 & 0xffff) << 16L); 183 d[1] = (uint32_t)(x2 & 0xffff) | ((uint32_t)(x3 & 0xffff) << 16L); 184 } 185 186 static void RC2_decrypt(uint32_t *d, RC2_KEY *key) { 187 int i, n; 188 uint16_t *p0, *p1; 189 uint16_t x0, x1, x2, x3, t; 190 uint32_t l; 191 192 l = d[0]; 193 x0 = (uint16_t)l & 0xffff; 194 x1 = (uint16_t)(l >> 16L); 195 l = d[1]; 196 x2 = (uint16_t)l & 0xffff; 197 x3 = (uint16_t)(l >> 16L); 198 199 n = 3; 200 i = 5; 201 202 p0 = &key->data[63]; 203 p1 = &key->data[0]; 204 for (;;) { 205 t = ((x3 << 11) | (x3 >> 5)) & 0xffff; 206 x3 = (t - (x0 & ~x2) - (x1 & x2) - *(p0--)) & 0xffff; 207 t = ((x2 << 13) | (x2 >> 3)) & 0xffff; 208 x2 = (t - (x3 & ~x1) - (x0 & x1) - *(p0--)) & 0xffff; 209 t = ((x1 << 14) | (x1 >> 2)) & 0xffff; 210 x1 = (t - (x2 & ~x0) - (x3 & x0) - *(p0--)) & 0xffff; 211 t = ((x0 << 15) | (x0 >> 1)) & 0xffff; 212 x0 = (t - (x1 & ~x3) - (x2 & x3) - *(p0--)) & 0xffff; 213 214 if (--i == 0) { 215 if (--n == 0) { 216 break; 217 } 218 i = (n == 2) ? 6 : 5; 219 220 x3 = (x3 - p1[x2 & 0x3f]) & 0xffff; 221 x2 = (x2 - p1[x1 & 0x3f]) & 0xffff; 222 x1 = (x1 - p1[x0 & 0x3f]) & 0xffff; 223 x0 = (x0 - p1[x3 & 0x3f]) & 0xffff; 224 } 225 } 226 227 d[0] = (uint32_t)(x0 & 0xffff) | ((uint32_t)(x1 & 0xffff) << 16L); 228 d[1] = (uint32_t)(x2 & 0xffff) | ((uint32_t)(x3 & 0xffff) << 16L); 229 } 230 231 static void RC2_cbc_encrypt(const uint8_t *in, uint8_t *out, size_t length, 232 RC2_KEY *ks, uint8_t *iv, int encrypt) { 233 uint32_t tin0, tin1; 234 uint32_t tout0, tout1, xor0, xor1; 235 long l = length; 236 uint32_t tin[2]; 237 238 if (encrypt) { 239 c2l(iv, tout0); 240 c2l(iv, tout1); 241 iv -= 8; 242 for (l -= 8; l >= 0; l -= 8) { 243 c2l(in, tin0); 244 c2l(in, tin1); 245 tin0 ^= tout0; 246 tin1 ^= tout1; 247 tin[0] = tin0; 248 tin[1] = tin1; 249 RC2_encrypt(tin, ks); 250 tout0 = tin[0]; 251 l2c(tout0, out); 252 tout1 = tin[1]; 253 l2c(tout1, out); 254 } 255 if (l != -8) { 256 c2ln(in, tin0, tin1, l + 8); 257 tin0 ^= tout0; 258 tin1 ^= tout1; 259 tin[0] = tin0; 260 tin[1] = tin1; 261 RC2_encrypt(tin, ks); 262 tout0 = tin[0]; 263 l2c(tout0, out); 264 tout1 = tin[1]; 265 l2c(tout1, out); 266 } 267 l2c(tout0, iv); 268 l2c(tout1, iv); 269 } else { 270 c2l(iv, xor0); 271 c2l(iv, xor1); 272 iv -= 8; 273 for (l -= 8; l >= 0; l -= 8) { 274 c2l(in, tin0); 275 tin[0] = tin0; 276 c2l(in, tin1); 277 tin[1] = tin1; 278 RC2_decrypt(tin, ks); 279 tout0 = tin[0] ^ xor0; 280 tout1 = tin[1] ^ xor1; 281 l2c(tout0, out); 282 l2c(tout1, out); 283 xor0 = tin0; 284 xor1 = tin1; 285 } 286 if (l != -8) { 287 c2l(in, tin0); 288 tin[0] = tin0; 289 c2l(in, tin1); 290 tin[1] = tin1; 291 RC2_decrypt(tin, ks); 292 tout0 = tin[0] ^ xor0; 293 tout1 = tin[1] ^ xor1; 294 l2cn(tout0, tout1, out, l + 8); 295 xor0 = tin0; 296 xor1 = tin1; 297 } 298 l2c(xor0, iv); 299 l2c(xor1, iv); 300 } 301 tin[0] = tin[1] = 0; 302 } 303 304 static const uint8_t key_table[256] = { 305 0xd9, 0x78, 0xf9, 0xc4, 0x19, 0xdd, 0xb5, 0xed, 0x28, 0xe9, 0xfd, 0x79, 306 0x4a, 0xa0, 0xd8, 0x9d, 0xc6, 0x7e, 0x37, 0x83, 0x2b, 0x76, 0x53, 0x8e, 307 0x62, 0x4c, 0x64, 0x88, 0x44, 0x8b, 0xfb, 0xa2, 0x17, 0x9a, 0x59, 0xf5, 308 0x87, 0xb3, 0x4f, 0x13, 0x61, 0x45, 0x6d, 0x8d, 0x09, 0x81, 0x7d, 0x32, 309 0xbd, 0x8f, 0x40, 0xeb, 0x86, 0xb7, 0x7b, 0x0b, 0xf0, 0x95, 0x21, 0x22, 310 0x5c, 0x6b, 0x4e, 0x82, 0x54, 0xd6, 0x65, 0x93, 0xce, 0x60, 0xb2, 0x1c, 311 0x73, 0x56, 0xc0, 0x14, 0xa7, 0x8c, 0xf1, 0xdc, 0x12, 0x75, 0xca, 0x1f, 312 0x3b, 0xbe, 0xe4, 0xd1, 0x42, 0x3d, 0xd4, 0x30, 0xa3, 0x3c, 0xb6, 0x26, 313 0x6f, 0xbf, 0x0e, 0xda, 0x46, 0x69, 0x07, 0x57, 0x27, 0xf2, 0x1d, 0x9b, 314 0xbc, 0x94, 0x43, 0x03, 0xf8, 0x11, 0xc7, 0xf6, 0x90, 0xef, 0x3e, 0xe7, 315 0x06, 0xc3, 0xd5, 0x2f, 0xc8, 0x66, 0x1e, 0xd7, 0x08, 0xe8, 0xea, 0xde, 316 0x80, 0x52, 0xee, 0xf7, 0x84, 0xaa, 0x72, 0xac, 0x35, 0x4d, 0x6a, 0x2a, 317 0x96, 0x1a, 0xd2, 0x71, 0x5a, 0x15, 0x49, 0x74, 0x4b, 0x9f, 0xd0, 0x5e, 318 0x04, 0x18, 0xa4, 0xec, 0xc2, 0xe0, 0x41, 0x6e, 0x0f, 0x51, 0xcb, 0xcc, 319 0x24, 0x91, 0xaf, 0x50, 0xa1, 0xf4, 0x70, 0x39, 0x99, 0x7c, 0x3a, 0x85, 320 0x23, 0xb8, 0xb4, 0x7a, 0xfc, 0x02, 0x36, 0x5b, 0x25, 0x55, 0x97, 0x31, 321 0x2d, 0x5d, 0xfa, 0x98, 0xe3, 0x8a, 0x92, 0xae, 0x05, 0xdf, 0x29, 0x10, 322 0x67, 0x6c, 0xba, 0xc9, 0xd3, 0x00, 0xe6, 0xcf, 0xe1, 0x9e, 0xa8, 0x2c, 323 0x63, 0x16, 0x01, 0x3f, 0x58, 0xe2, 0x89, 0xa9, 0x0d, 0x38, 0x34, 0x1b, 324 0xab, 0x33, 0xff, 0xb0, 0xbb, 0x48, 0x0c, 0x5f, 0xb9, 0xb1, 0xcd, 0x2e, 325 0xc5, 0xf3, 0xdb, 0x47, 0xe5, 0xa5, 0x9c, 0x77, 0x0a, 0xa6, 0x20, 0x68, 326 0xfe, 0x7f, 0xc1, 0xad, 327 }; 328 329 static void RC2_set_key(RC2_KEY *key, int len, const uint8_t *data, int bits) { 330 int i, j; 331 uint8_t *k; 332 uint16_t *ki; 333 unsigned int c, d; 334 335 k = (uint8_t *)&key->data[0]; 336 *k = 0; // for if there is a zero length key 337 338 if (len > 128) { 339 len = 128; 340 } 341 if (bits <= 0) { 342 bits = 1024; 343 } 344 if (bits > 1024) { 345 bits = 1024; 346 } 347 348 for (i = 0; i < len; i++) { 349 k[i] = data[i]; 350 } 351 352 // expand table 353 d = k[len - 1]; 354 j = 0; 355 for (i = len; i < 128; i++, j++) { 356 d = key_table[(k[j] + d) & 0xff]; 357 k[i] = d; 358 } 359 360 // hmm.... key reduction to 'bits' bits 361 362 j = (bits + 7) >> 3; 363 i = 128 - j; 364 c = (0xff >> (-bits & 0x07)); 365 366 d = key_table[k[i] & c]; 367 k[i] = d; 368 while (i--) { 369 d = key_table[k[i + j] ^ d]; 370 k[i] = d; 371 } 372 373 // copy from bytes into uint16_t's 374 ki = &(key->data[63]); 375 for (i = 127; i >= 0; i -= 2) { 376 *(ki--) = ((k[i] << 8) | k[i - 1]) & 0xffff; 377 } 378 } 379 380 typedef struct { 381 int key_bits; // effective key bits 382 RC2_KEY ks; // key schedule 383 } EVP_RC2_KEY; 384 385 static int rc2_init_key(EVP_CIPHER_CTX *ctx, const uint8_t *key, 386 const uint8_t *iv, int enc) { 387 EVP_RC2_KEY *rc2_key = (EVP_RC2_KEY *)ctx->cipher_data; 388 RC2_set_key(&rc2_key->ks, EVP_CIPHER_CTX_key_length(ctx), key, 389 rc2_key->key_bits); 390 return 1; 391 } 392 393 static int rc2_cbc_cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in, 394 size_t inl) { 395 EVP_RC2_KEY *key = (EVP_RC2_KEY *)ctx->cipher_data; 396 static const size_t kChunkSize = 0x10000; 397 398 while (inl >= kChunkSize) { 399 RC2_cbc_encrypt(in, out, kChunkSize, &key->ks, ctx->iv, ctx->encrypt); 400 inl -= kChunkSize; 401 in += kChunkSize; 402 out += kChunkSize; 403 } 404 if (inl) { 405 RC2_cbc_encrypt(in, out, inl, &key->ks, ctx->iv, ctx->encrypt); 406 } 407 return 1; 408 } 409 410 static int rc2_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, void *ptr) { 411 EVP_RC2_KEY *key = (EVP_RC2_KEY *)ctx->cipher_data; 412 413 switch (type) { 414 case EVP_CTRL_INIT: 415 key->key_bits = EVP_CIPHER_CTX_key_length(ctx) * 8; 416 return 1; 417 case EVP_CTRL_SET_RC2_KEY_BITS: 418 // Should be overridden by later call to |EVP_CTRL_INIT|, but 419 // people call it, so it may as well work. 420 key->key_bits = arg; 421 return 1; 422 423 default: 424 return -1; 425 } 426 } 427 428 static const EVP_CIPHER rc2_40_cbc = { 429 NID_rc2_40_cbc, 430 8 /* block size */, 431 5 /* 40 bit */, 432 8 /* iv len */, 433 sizeof(EVP_RC2_KEY), 434 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 435 NULL /* app_data */, 436 rc2_init_key, 437 rc2_cbc_cipher, 438 NULL, 439 rc2_ctrl, 440 }; 441 442 const EVP_CIPHER *EVP_rc2_40_cbc(void) { 443 return &rc2_40_cbc; 444 } 445 446 static const EVP_CIPHER rc2_cbc = { 447 NID_rc2_cbc, 448 8 /* block size */, 449 16 /* 128 bit */, 450 8 /* iv len */, 451 sizeof(EVP_RC2_KEY), 452 EVP_CIPH_CBC_MODE | EVP_CIPH_VARIABLE_LENGTH | EVP_CIPH_CTRL_INIT, 453 NULL /* app_data */, 454 rc2_init_key, 455 rc2_cbc_cipher, 456 NULL, 457 rc2_ctrl, 458 }; 459 460 const EVP_CIPHER *EVP_rc2_cbc(void) { 461 return &rc2_cbc; 462 } 463
