Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 1 | /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com) |
| 2 | * All rights reserved. |
| 3 | * |
| 4 | * This package is an SSL implementation written |
| 5 | * by Eric Young (eay@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@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@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@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 | |
| 59 | #include <assert.h> |
| 60 | #include <string.h> |
| 61 | |
| 62 | #include <openssl/err.h> |
| 63 | #include <openssl/mem.h> |
David Benjamin | 4969cc9 | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 64 | #include <openssl/nid.h> |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 65 | |
| 66 | #include "internal.h" |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 67 | #include "../internal.h" |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 68 | |
| 69 | |
| 70 | const EVP_CIPHER *EVP_get_cipherbynid(int nid) { |
| 71 | switch (nid) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 72 | case NID_rc2_cbc: |
| 73 | return EVP_rc2_cbc(); |
| 74 | case NID_rc2_40_cbc: |
| 75 | return EVP_rc2_40_cbc(); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 76 | case NID_des_ede3_cbc: |
| 77 | return EVP_des_ede3_cbc(); |
| 78 | case NID_des_ede_cbc: |
| 79 | return EVP_des_cbc(); |
| 80 | case NID_aes_128_cbc: |
| 81 | return EVP_aes_128_cbc(); |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 82 | case NID_aes_192_cbc: |
| 83 | return EVP_aes_192_cbc(); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 84 | case NID_aes_256_cbc: |
| 85 | return EVP_aes_256_cbc(); |
| 86 | default: |
| 87 | return NULL; |
| 88 | } |
| 89 | } |
| 90 | |
| 91 | void EVP_CIPHER_CTX_init(EVP_CIPHER_CTX *ctx) { |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 92 | OPENSSL_memset(ctx, 0, sizeof(EVP_CIPHER_CTX)); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 93 | } |
| 94 | |
| 95 | EVP_CIPHER_CTX *EVP_CIPHER_CTX_new(void) { |
| 96 | EVP_CIPHER_CTX *ctx = OPENSSL_malloc(sizeof(EVP_CIPHER_CTX)); |
| 97 | if (ctx) { |
| 98 | EVP_CIPHER_CTX_init(ctx); |
| 99 | } |
| 100 | return ctx; |
| 101 | } |
| 102 | |
| 103 | int EVP_CIPHER_CTX_cleanup(EVP_CIPHER_CTX *c) { |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 104 | if (c->cipher != NULL) { |
| 105 | if (c->cipher->cleanup) { |
| 106 | c->cipher->cleanup(c); |
| 107 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 108 | OPENSSL_cleanse(c->cipher_data, c->cipher->ctx_size); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 109 | } |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 110 | OPENSSL_free(c->cipher_data); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 111 | |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 112 | OPENSSL_memset(c, 0, sizeof(EVP_CIPHER_CTX)); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 113 | return 1; |
| 114 | } |
| 115 | |
| 116 | void EVP_CIPHER_CTX_free(EVP_CIPHER_CTX *ctx) { |
| 117 | if (ctx) { |
| 118 | EVP_CIPHER_CTX_cleanup(ctx); |
| 119 | OPENSSL_free(ctx); |
| 120 | } |
| 121 | } |
| 122 | |
| 123 | int EVP_CIPHER_CTX_copy(EVP_CIPHER_CTX *out, const EVP_CIPHER_CTX *in) { |
| 124 | if (in == NULL || in->cipher == NULL) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 125 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_INPUT_NOT_INITIALIZED); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 126 | return 0; |
| 127 | } |
| 128 | |
| 129 | EVP_CIPHER_CTX_cleanup(out); |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 130 | OPENSSL_memcpy(out, in, sizeof(EVP_CIPHER_CTX)); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 131 | |
| 132 | if (in->cipher_data && in->cipher->ctx_size) { |
| 133 | out->cipher_data = OPENSSL_malloc(in->cipher->ctx_size); |
| 134 | if (!out->cipher_data) { |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 135 | out->cipher = NULL; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 136 | OPENSSL_PUT_ERROR(CIPHER, ERR_R_MALLOC_FAILURE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 137 | return 0; |
| 138 | } |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 139 | OPENSSL_memcpy(out->cipher_data, in->cipher_data, in->cipher->ctx_size); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 140 | } |
| 141 | |
| 142 | if (in->cipher->flags & EVP_CIPH_CUSTOM_COPY) { |
Robert Sloan | a94fe05 | 2017-02-21 08:49:28 -0800 | [diff] [blame] | 143 | if (!in->cipher->ctrl((EVP_CIPHER_CTX *)in, EVP_CTRL_COPY, 0, out)) { |
| 144 | out->cipher = NULL; |
| 145 | return 0; |
| 146 | } |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 147 | } |
| 148 | |
| 149 | return 1; |
| 150 | } |
| 151 | |
| 152 | int EVP_CipherInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
| 153 | ENGINE *engine, const uint8_t *key, const uint8_t *iv, |
| 154 | int enc) { |
| 155 | if (enc == -1) { |
| 156 | enc = ctx->encrypt; |
| 157 | } else { |
| 158 | if (enc) { |
| 159 | enc = 1; |
| 160 | } |
| 161 | ctx->encrypt = enc; |
| 162 | } |
| 163 | |
| 164 | if (cipher) { |
| 165 | /* Ensure a context left from last time is cleared (the previous check |
| 166 | * attempted to avoid this if the same ENGINE and EVP_CIPHER could be |
| 167 | * used). */ |
| 168 | if (ctx->cipher) { |
| 169 | EVP_CIPHER_CTX_cleanup(ctx); |
| 170 | /* Restore encrypt and flags */ |
| 171 | ctx->encrypt = enc; |
| 172 | } |
| 173 | |
| 174 | ctx->cipher = cipher; |
| 175 | if (ctx->cipher->ctx_size) { |
| 176 | ctx->cipher_data = OPENSSL_malloc(ctx->cipher->ctx_size); |
| 177 | if (!ctx->cipher_data) { |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 178 | ctx->cipher = NULL; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 179 | OPENSSL_PUT_ERROR(CIPHER, ERR_R_MALLOC_FAILURE); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 180 | return 0; |
| 181 | } |
| 182 | } else { |
| 183 | ctx->cipher_data = NULL; |
| 184 | } |
| 185 | |
| 186 | ctx->key_len = cipher->key_len; |
| 187 | ctx->flags = 0; |
| 188 | |
| 189 | if (ctx->cipher->flags & EVP_CIPH_CTRL_INIT) { |
| 190 | if (!EVP_CIPHER_CTX_ctrl(ctx, EVP_CTRL_INIT, 0, NULL)) { |
Adam Langley | f4e4272 | 2015-06-04 17:45:09 -0700 | [diff] [blame] | 191 | ctx->cipher = NULL; |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 192 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_INITIALIZATION_ERROR); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 193 | return 0; |
| 194 | } |
| 195 | } |
| 196 | } else if (!ctx->cipher) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 197 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_NO_CIPHER_SET); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 198 | return 0; |
| 199 | } |
| 200 | |
| 201 | /* we assume block size is a power of 2 in *cryptUpdate */ |
| 202 | assert(ctx->cipher->block_size == 1 || ctx->cipher->block_size == 8 || |
| 203 | ctx->cipher->block_size == 16); |
| 204 | |
| 205 | if (!(EVP_CIPHER_CTX_flags(ctx) & EVP_CIPH_CUSTOM_IV)) { |
| 206 | switch (EVP_CIPHER_CTX_mode(ctx)) { |
| 207 | case EVP_CIPH_STREAM_CIPHER: |
| 208 | case EVP_CIPH_ECB_MODE: |
| 209 | break; |
| 210 | |
| 211 | case EVP_CIPH_CFB_MODE: |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 212 | ctx->num = 0; |
| 213 | /* fall-through */ |
| 214 | |
| 215 | case EVP_CIPH_CBC_MODE: |
| 216 | assert(EVP_CIPHER_CTX_iv_length(ctx) <= sizeof(ctx->iv)); |
| 217 | if (iv) { |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 218 | OPENSSL_memcpy(ctx->oiv, iv, EVP_CIPHER_CTX_iv_length(ctx)); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 219 | } |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 220 | OPENSSL_memcpy(ctx->iv, ctx->oiv, EVP_CIPHER_CTX_iv_length(ctx)); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 221 | break; |
| 222 | |
| 223 | case EVP_CIPH_CTR_MODE: |
Adam Langley | e9ada86 | 2015-05-11 17:20:37 -0700 | [diff] [blame] | 224 | case EVP_CIPH_OFB_MODE: |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 225 | ctx->num = 0; |
| 226 | /* Don't reuse IV for CTR mode */ |
| 227 | if (iv) { |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 228 | OPENSSL_memcpy(ctx->iv, iv, EVP_CIPHER_CTX_iv_length(ctx)); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 229 | } |
| 230 | break; |
| 231 | |
| 232 | default: |
| 233 | return 0; |
| 234 | } |
| 235 | } |
| 236 | |
| 237 | if (key || (ctx->cipher->flags & EVP_CIPH_ALWAYS_CALL_INIT)) { |
| 238 | if (!ctx->cipher->init(ctx, key, iv, enc)) { |
| 239 | return 0; |
| 240 | } |
| 241 | } |
| 242 | |
| 243 | ctx->buf_len = 0; |
| 244 | ctx->final_used = 0; |
| 245 | ctx->block_mask = ctx->cipher->block_size - 1; |
| 246 | return 1; |
| 247 | } |
| 248 | |
| 249 | int EVP_EncryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
| 250 | ENGINE *impl, const uint8_t *key, const uint8_t *iv) { |
| 251 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 1); |
| 252 | } |
| 253 | |
| 254 | int EVP_DecryptInit_ex(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
| 255 | ENGINE *impl, const uint8_t *key, const uint8_t *iv) { |
| 256 | return EVP_CipherInit_ex(ctx, cipher, impl, key, iv, 0); |
| 257 | } |
| 258 | |
| 259 | int EVP_EncryptUpdate(EVP_CIPHER_CTX *ctx, uint8_t *out, int *out_len, |
| 260 | const uint8_t *in, int in_len) { |
| 261 | int i, j, bl; |
| 262 | |
| 263 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
| 264 | i = ctx->cipher->cipher(ctx, out, in, in_len); |
| 265 | if (i < 0) { |
| 266 | return 0; |
| 267 | } else { |
| 268 | *out_len = i; |
| 269 | } |
| 270 | return 1; |
| 271 | } |
| 272 | |
| 273 | if (in_len <= 0) { |
| 274 | *out_len = 0; |
| 275 | return in_len == 0; |
| 276 | } |
| 277 | |
| 278 | if (ctx->buf_len == 0 && (in_len & ctx->block_mask) == 0) { |
| 279 | if (ctx->cipher->cipher(ctx, out, in, in_len)) { |
| 280 | *out_len = in_len; |
| 281 | return 1; |
| 282 | } else { |
| 283 | *out_len = 0; |
| 284 | return 0; |
| 285 | } |
| 286 | } |
| 287 | |
| 288 | i = ctx->buf_len; |
| 289 | bl = ctx->cipher->block_size; |
| 290 | assert(bl <= (int)sizeof(ctx->buf)); |
| 291 | if (i != 0) { |
David Benjamin | 9aaebef | 2016-04-22 15:02:23 -0400 | [diff] [blame] | 292 | if (bl - i > in_len) { |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 293 | OPENSSL_memcpy(&ctx->buf[i], in, in_len); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 294 | ctx->buf_len += in_len; |
| 295 | *out_len = 0; |
| 296 | return 1; |
| 297 | } else { |
| 298 | j = bl - i; |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 299 | OPENSSL_memcpy(&ctx->buf[i], in, j); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 300 | if (!ctx->cipher->cipher(ctx, out, ctx->buf, bl)) { |
| 301 | return 0; |
| 302 | } |
| 303 | in_len -= j; |
| 304 | in += j; |
| 305 | out += bl; |
| 306 | *out_len = bl; |
| 307 | } |
| 308 | } else { |
| 309 | *out_len = 0; |
| 310 | } |
| 311 | |
| 312 | i = in_len & ctx->block_mask; |
| 313 | in_len -= i; |
| 314 | if (in_len > 0) { |
| 315 | if (!ctx->cipher->cipher(ctx, out, in, in_len)) { |
| 316 | return 0; |
| 317 | } |
| 318 | *out_len += in_len; |
| 319 | } |
| 320 | |
| 321 | if (i != 0) { |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 322 | OPENSSL_memcpy(ctx->buf, &in[in_len], i); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 323 | } |
| 324 | ctx->buf_len = i; |
| 325 | return 1; |
| 326 | } |
| 327 | |
| 328 | int EVP_EncryptFinal_ex(EVP_CIPHER_CTX *ctx, uint8_t *out, int *out_len) { |
| 329 | int n, ret; |
| 330 | unsigned int i, b, bl; |
| 331 | |
| 332 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
| 333 | ret = ctx->cipher->cipher(ctx, out, NULL, 0); |
| 334 | if (ret < 0) { |
| 335 | return 0; |
| 336 | } else { |
| 337 | *out_len = ret; |
| 338 | } |
| 339 | return 1; |
| 340 | } |
| 341 | |
| 342 | b = ctx->cipher->block_size; |
| 343 | assert(b <= sizeof(ctx->buf)); |
| 344 | if (b == 1) { |
| 345 | *out_len = 0; |
| 346 | return 1; |
| 347 | } |
| 348 | |
| 349 | bl = ctx->buf_len; |
| 350 | if (ctx->flags & EVP_CIPH_NO_PADDING) { |
| 351 | if (bl) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 352 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 353 | return 0; |
| 354 | } |
| 355 | *out_len = 0; |
| 356 | return 1; |
| 357 | } |
| 358 | |
| 359 | n = b - bl; |
| 360 | for (i = bl; i < b; i++) { |
| 361 | ctx->buf[i] = n; |
| 362 | } |
| 363 | ret = ctx->cipher->cipher(ctx, out, ctx->buf, b); |
| 364 | |
| 365 | if (ret) { |
| 366 | *out_len = b; |
| 367 | } |
| 368 | |
| 369 | return ret; |
| 370 | } |
| 371 | |
| 372 | int EVP_DecryptUpdate(EVP_CIPHER_CTX *ctx, uint8_t *out, int *out_len, |
| 373 | const uint8_t *in, int in_len) { |
| 374 | int fix_len; |
| 375 | unsigned int b; |
| 376 | |
| 377 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
| 378 | int r = ctx->cipher->cipher(ctx, out, in, in_len); |
| 379 | if (r < 0) { |
| 380 | *out_len = 0; |
| 381 | return 0; |
| 382 | } else { |
| 383 | *out_len = r; |
| 384 | } |
| 385 | return 1; |
| 386 | } |
| 387 | |
| 388 | if (in_len <= 0) { |
| 389 | *out_len = 0; |
| 390 | return in_len == 0; |
| 391 | } |
| 392 | |
| 393 | if (ctx->flags & EVP_CIPH_NO_PADDING) { |
| 394 | return EVP_EncryptUpdate(ctx, out, out_len, in, in_len); |
| 395 | } |
| 396 | |
| 397 | b = ctx->cipher->block_size; |
| 398 | assert(b <= sizeof(ctx->final)); |
| 399 | |
| 400 | if (ctx->final_used) { |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 401 | OPENSSL_memcpy(out, ctx->final, b); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 402 | out += b; |
| 403 | fix_len = 1; |
| 404 | } else { |
| 405 | fix_len = 0; |
| 406 | } |
| 407 | |
| 408 | if (!EVP_EncryptUpdate(ctx, out, out_len, in, in_len)) { |
| 409 | return 0; |
| 410 | } |
| 411 | |
| 412 | /* if we have 'decrypted' a multiple of block size, make sure |
| 413 | * we have a copy of this last block */ |
| 414 | if (b > 1 && !ctx->buf_len) { |
| 415 | *out_len -= b; |
| 416 | ctx->final_used = 1; |
Robert Sloan | 69939df | 2017-01-09 10:53:07 -0800 | [diff] [blame] | 417 | OPENSSL_memcpy(ctx->final, &out[*out_len], b); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 418 | } else { |
| 419 | ctx->final_used = 0; |
| 420 | } |
| 421 | |
| 422 | if (fix_len) { |
| 423 | *out_len += b; |
| 424 | } |
| 425 | |
| 426 | return 1; |
| 427 | } |
| 428 | |
| 429 | int EVP_DecryptFinal_ex(EVP_CIPHER_CTX *ctx, unsigned char *out, int *out_len) { |
| 430 | int i, n; |
| 431 | unsigned int b; |
| 432 | *out_len = 0; |
| 433 | |
| 434 | if (ctx->cipher->flags & EVP_CIPH_FLAG_CUSTOM_CIPHER) { |
| 435 | i = ctx->cipher->cipher(ctx, out, NULL, 0); |
| 436 | if (i < 0) { |
| 437 | return 0; |
| 438 | } else { |
| 439 | *out_len = i; |
| 440 | } |
| 441 | return 1; |
| 442 | } |
| 443 | |
| 444 | b = ctx->cipher->block_size; |
| 445 | if (ctx->flags & EVP_CIPH_NO_PADDING) { |
| 446 | if (ctx->buf_len) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 447 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_DATA_NOT_MULTIPLE_OF_BLOCK_LENGTH); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 448 | return 0; |
| 449 | } |
| 450 | *out_len = 0; |
| 451 | return 1; |
| 452 | } |
| 453 | |
| 454 | if (b > 1) { |
| 455 | if (ctx->buf_len || !ctx->final_used) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 456 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_WRONG_FINAL_BLOCK_LENGTH); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 457 | return 0; |
| 458 | } |
| 459 | assert(b <= sizeof(ctx->final)); |
| 460 | |
| 461 | /* The following assumes that the ciphertext has been authenticated. |
| 462 | * Otherwise it provides a padding oracle. */ |
| 463 | n = ctx->final[b - 1]; |
| 464 | if (n == 0 || n > (int)b) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 465 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 466 | return 0; |
| 467 | } |
| 468 | |
| 469 | for (i = 0; i < n; i++) { |
| 470 | if (ctx->final[--b] != n) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 471 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_BAD_DECRYPT); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 472 | return 0; |
| 473 | } |
| 474 | } |
| 475 | |
| 476 | n = ctx->cipher->block_size - n; |
| 477 | for (i = 0; i < n; i++) { |
| 478 | out[i] = ctx->final[i]; |
| 479 | } |
| 480 | *out_len = n; |
| 481 | } else { |
| 482 | *out_len = 0; |
| 483 | } |
| 484 | |
| 485 | return 1; |
| 486 | } |
| 487 | |
| 488 | int EVP_Cipher(EVP_CIPHER_CTX *ctx, uint8_t *out, const uint8_t *in, |
| 489 | size_t in_len) { |
| 490 | return ctx->cipher->cipher(ctx, out, in, in_len); |
| 491 | } |
| 492 | |
| 493 | int EVP_CipherUpdate(EVP_CIPHER_CTX *ctx, uint8_t *out, int *out_len, |
| 494 | const uint8_t *in, int in_len) { |
| 495 | if (ctx->encrypt) { |
| 496 | return EVP_EncryptUpdate(ctx, out, out_len, in, in_len); |
| 497 | } else { |
| 498 | return EVP_DecryptUpdate(ctx, out, out_len, in, in_len); |
| 499 | } |
| 500 | } |
| 501 | |
| 502 | int EVP_CipherFinal_ex(EVP_CIPHER_CTX *ctx, uint8_t *out, int *out_len) { |
| 503 | if (ctx->encrypt) { |
| 504 | return EVP_EncryptFinal_ex(ctx, out, out_len); |
| 505 | } else { |
| 506 | return EVP_DecryptFinal_ex(ctx, out, out_len); |
| 507 | } |
| 508 | } |
| 509 | |
| 510 | const EVP_CIPHER *EVP_CIPHER_CTX_cipher(const EVP_CIPHER_CTX *ctx) { |
| 511 | return ctx->cipher; |
| 512 | } |
| 513 | |
| 514 | int EVP_CIPHER_CTX_nid(const EVP_CIPHER_CTX *ctx) { |
| 515 | return ctx->cipher->nid; |
| 516 | } |
| 517 | |
| 518 | unsigned EVP_CIPHER_CTX_block_size(const EVP_CIPHER_CTX *ctx) { |
| 519 | return ctx->cipher->block_size; |
| 520 | } |
| 521 | |
| 522 | unsigned EVP_CIPHER_CTX_key_length(const EVP_CIPHER_CTX *ctx) { |
| 523 | return ctx->key_len; |
| 524 | } |
| 525 | |
| 526 | unsigned EVP_CIPHER_CTX_iv_length(const EVP_CIPHER_CTX *ctx) { |
| 527 | return ctx->cipher->iv_len; |
| 528 | } |
| 529 | |
| 530 | void *EVP_CIPHER_CTX_get_app_data(const EVP_CIPHER_CTX *ctx) { |
| 531 | return ctx->app_data; |
| 532 | } |
| 533 | |
| 534 | void EVP_CIPHER_CTX_set_app_data(EVP_CIPHER_CTX *ctx, void *data) { |
| 535 | ctx->app_data = data; |
| 536 | } |
| 537 | |
| 538 | uint32_t EVP_CIPHER_CTX_flags(const EVP_CIPHER_CTX *ctx) { |
| 539 | return ctx->cipher->flags & ~EVP_CIPH_MODE_MASK; |
| 540 | } |
| 541 | |
| 542 | uint32_t EVP_CIPHER_CTX_mode(const EVP_CIPHER_CTX *ctx) { |
| 543 | return ctx->cipher->flags & EVP_CIPH_MODE_MASK; |
| 544 | } |
| 545 | |
| 546 | int EVP_CIPHER_CTX_ctrl(EVP_CIPHER_CTX *ctx, int command, int arg, void *ptr) { |
| 547 | int ret; |
| 548 | if (!ctx->cipher) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 549 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_NO_CIPHER_SET); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 550 | return 0; |
| 551 | } |
| 552 | |
| 553 | if (!ctx->cipher->ctrl) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 554 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_CTRL_NOT_IMPLEMENTED); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 555 | return 0; |
| 556 | } |
| 557 | |
| 558 | ret = ctx->cipher->ctrl(ctx, command, arg, ptr); |
| 559 | if (ret == -1) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 560 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_CTRL_OPERATION_NOT_IMPLEMENTED); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 561 | return 0; |
| 562 | } |
| 563 | |
| 564 | return ret; |
| 565 | } |
| 566 | |
| 567 | int EVP_CIPHER_CTX_set_padding(EVP_CIPHER_CTX *ctx, int pad) { |
| 568 | if (pad) { |
| 569 | ctx->flags &= ~EVP_CIPH_NO_PADDING; |
| 570 | } else { |
| 571 | ctx->flags |= EVP_CIPH_NO_PADDING; |
| 572 | } |
| 573 | return 1; |
| 574 | } |
| 575 | |
| 576 | int EVP_CIPHER_CTX_set_key_length(EVP_CIPHER_CTX *c, unsigned key_len) { |
| 577 | if (c->key_len == key_len) { |
| 578 | return 1; |
| 579 | } |
| 580 | |
| 581 | if (key_len == 0 || !(c->cipher->flags & EVP_CIPH_VARIABLE_LENGTH)) { |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 582 | OPENSSL_PUT_ERROR(CIPHER, CIPHER_R_INVALID_KEY_LENGTH); |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 583 | return 0; |
| 584 | } |
| 585 | |
| 586 | c->key_len = key_len; |
| 587 | return 1; |
| 588 | } |
| 589 | |
| 590 | int EVP_CIPHER_nid(const EVP_CIPHER *cipher) { return cipher->nid; } |
| 591 | |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 592 | unsigned EVP_CIPHER_block_size(const EVP_CIPHER *cipher) { |
| 593 | return cipher->block_size; |
| 594 | } |
| 595 | |
| 596 | unsigned EVP_CIPHER_key_length(const EVP_CIPHER *cipher) { |
| 597 | return cipher->key_len; |
| 598 | } |
| 599 | |
| 600 | unsigned EVP_CIPHER_iv_length(const EVP_CIPHER *cipher) { |
| 601 | return cipher->iv_len; |
| 602 | } |
| 603 | |
| 604 | uint32_t EVP_CIPHER_flags(const EVP_CIPHER *cipher) { |
| 605 | return cipher->flags & ~EVP_CIPH_MODE_MASK; |
| 606 | } |
| 607 | |
| 608 | uint32_t EVP_CIPHER_mode(const EVP_CIPHER *cipher) { |
| 609 | return cipher->flags & EVP_CIPH_MODE_MASK; |
| 610 | } |
| 611 | |
| 612 | int EVP_CipherInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
| 613 | const uint8_t *key, const uint8_t *iv, int enc) { |
| 614 | if (cipher) { |
| 615 | EVP_CIPHER_CTX_init(ctx); |
| 616 | } |
| 617 | return EVP_CipherInit_ex(ctx, cipher, NULL, key, iv, enc); |
| 618 | } |
| 619 | |
| 620 | int EVP_EncryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
| 621 | const uint8_t *key, const uint8_t *iv) { |
| 622 | return EVP_CipherInit(ctx, cipher, key, iv, 1); |
| 623 | } |
| 624 | |
| 625 | int EVP_DecryptInit(EVP_CIPHER_CTX *ctx, const EVP_CIPHER *cipher, |
| 626 | const uint8_t *key, const uint8_t *iv) { |
| 627 | return EVP_CipherInit(ctx, cipher, key, iv, 0); |
| 628 | } |
| 629 | |
| 630 | int EVP_add_cipher_alias(const char *a, const char *b) { |
| 631 | return 1; |
| 632 | } |
| 633 | |
| 634 | const EVP_CIPHER *EVP_get_cipherbyname(const char *name) { |
| 635 | if (OPENSSL_strcasecmp(name, "rc4") == 0) { |
| 636 | return EVP_rc4(); |
| 637 | } else if (OPENSSL_strcasecmp(name, "des-cbc") == 0) { |
| 638 | return EVP_des_cbc(); |
Kenny Root | b849459 | 2015-09-25 02:29:14 +0000 | [diff] [blame] | 639 | } else if (OPENSSL_strcasecmp(name, "des-ede3-cbc") == 0 || |
Adam Langley | d9e397b | 2015-01-22 14:27:53 -0800 | [diff] [blame] | 640 | OPENSSL_strcasecmp(name, "3des") == 0) { |
| 641 | return EVP_des_ede3_cbc(); |
| 642 | } else if (OPENSSL_strcasecmp(name, "aes-128-cbc") == 0) { |
| 643 | return EVP_aes_128_cbc(); |
| 644 | } else if (OPENSSL_strcasecmp(name, "aes-256-cbc") == 0) { |
| 645 | return EVP_aes_256_cbc(); |
| 646 | } else if (OPENSSL_strcasecmp(name, "aes-128-ctr") == 0) { |
| 647 | return EVP_aes_128_ctr(); |
| 648 | } else if (OPENSSL_strcasecmp(name, "aes-256-ctr") == 0) { |
| 649 | return EVP_aes_256_ctr(); |
| 650 | } else if (OPENSSL_strcasecmp(name, "aes-128-ecb") == 0) { |
| 651 | return EVP_aes_128_ecb(); |
| 652 | } else if (OPENSSL_strcasecmp(name, "aes-256-ecb") == 0) { |
| 653 | return EVP_aes_256_ecb(); |
| 654 | } |
| 655 | |
| 656 | return NULL; |
| 657 | } |