cipher.c (59669B)
1 /** 2 * \file cipher.c 3 * 4 * \brief Generic cipher wrapper for Mbed TLS 5 * 6 * \author Adriaan de Jong <dejong@fox-it.com> 7 * 8 * Copyright The Mbed TLS Contributors 9 * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later 10 */ 11 12 #include "common.h" 13 14 #if defined(MBEDTLS_CIPHER_C) 15 16 #include "mbedtls/cipher.h" 17 #include "cipher_invasive.h" 18 #include "cipher_wrap.h" 19 #include "mbedtls/platform_util.h" 20 #include "mbedtls/error.h" 21 #include "mbedtls/constant_time.h" 22 #include "constant_time_internal.h" 23 24 #include <stdlib.h> 25 #include <string.h> 26 27 #if defined(MBEDTLS_CHACHAPOLY_C) 28 #include "mbedtls/chachapoly.h" 29 #endif 30 31 #if defined(MBEDTLS_GCM_C) 32 #include "mbedtls/gcm.h" 33 #endif 34 35 #if defined(MBEDTLS_CCM_C) 36 #include "mbedtls/ccm.h" 37 #endif 38 39 #if defined(MBEDTLS_CHACHA20_C) 40 #include "mbedtls/chacha20.h" 41 #endif 42 43 #if defined(MBEDTLS_CMAC_C) 44 #include "mbedtls/cmac.h" 45 #endif 46 47 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 48 #include "psa/crypto.h" 49 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 50 51 #if defined(MBEDTLS_NIST_KW_C) 52 #include "mbedtls/nist_kw.h" 53 #endif 54 55 #include "mbedtls/platform.h" 56 57 static int supported_init = 0; 58 59 static inline const mbedtls_cipher_base_t *mbedtls_cipher_get_base( 60 const mbedtls_cipher_info_t *info) 61 { 62 return mbedtls_cipher_base_lookup_table[info->base_idx]; 63 } 64 65 const int *mbedtls_cipher_list(void) 66 { 67 const mbedtls_cipher_definition_t *def; 68 int *type; 69 70 if (!supported_init) { 71 def = mbedtls_cipher_definitions; 72 type = mbedtls_cipher_supported; 73 74 while (def->type != 0) { 75 *type++ = (*def++).type; 76 } 77 78 *type = 0; 79 80 supported_init = 1; 81 } 82 83 return mbedtls_cipher_supported; 84 } 85 86 const mbedtls_cipher_info_t *mbedtls_cipher_info_from_type( 87 const mbedtls_cipher_type_t cipher_type) 88 { 89 const mbedtls_cipher_definition_t *def; 90 91 for (def = mbedtls_cipher_definitions; def->info != NULL; def++) { 92 if (def->type == cipher_type) { 93 return def->info; 94 } 95 } 96 97 return NULL; 98 } 99 100 const mbedtls_cipher_info_t *mbedtls_cipher_info_from_string( 101 const char *cipher_name) 102 { 103 const mbedtls_cipher_definition_t *def; 104 105 if (NULL == cipher_name) { 106 return NULL; 107 } 108 109 for (def = mbedtls_cipher_definitions; def->info != NULL; def++) { 110 if (!strcmp(def->info->name, cipher_name)) { 111 return def->info; 112 } 113 } 114 115 return NULL; 116 } 117 118 const mbedtls_cipher_info_t *mbedtls_cipher_info_from_values( 119 const mbedtls_cipher_id_t cipher_id, 120 int key_bitlen, 121 const mbedtls_cipher_mode_t mode) 122 { 123 const mbedtls_cipher_definition_t *def; 124 125 for (def = mbedtls_cipher_definitions; def->info != NULL; def++) { 126 if (mbedtls_cipher_get_base(def->info)->cipher == cipher_id && 127 mbedtls_cipher_info_get_key_bitlen(def->info) == (unsigned) key_bitlen && 128 def->info->mode == mode) { 129 return def->info; 130 } 131 } 132 133 return NULL; 134 } 135 136 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 137 static inline psa_key_type_t mbedtls_psa_translate_cipher_type( 138 mbedtls_cipher_type_t cipher) 139 { 140 switch (cipher) { 141 case MBEDTLS_CIPHER_AES_128_CCM: 142 case MBEDTLS_CIPHER_AES_192_CCM: 143 case MBEDTLS_CIPHER_AES_256_CCM: 144 case MBEDTLS_CIPHER_AES_128_CCM_STAR_NO_TAG: 145 case MBEDTLS_CIPHER_AES_192_CCM_STAR_NO_TAG: 146 case MBEDTLS_CIPHER_AES_256_CCM_STAR_NO_TAG: 147 case MBEDTLS_CIPHER_AES_128_GCM: 148 case MBEDTLS_CIPHER_AES_192_GCM: 149 case MBEDTLS_CIPHER_AES_256_GCM: 150 case MBEDTLS_CIPHER_AES_128_CBC: 151 case MBEDTLS_CIPHER_AES_192_CBC: 152 case MBEDTLS_CIPHER_AES_256_CBC: 153 case MBEDTLS_CIPHER_AES_128_ECB: 154 case MBEDTLS_CIPHER_AES_192_ECB: 155 case MBEDTLS_CIPHER_AES_256_ECB: 156 return PSA_KEY_TYPE_AES; 157 158 /* ARIA not yet supported in PSA. */ 159 /* case MBEDTLS_CIPHER_ARIA_128_CCM: 160 case MBEDTLS_CIPHER_ARIA_192_CCM: 161 case MBEDTLS_CIPHER_ARIA_256_CCM: 162 case MBEDTLS_CIPHER_ARIA_128_CCM_STAR_NO_TAG: 163 case MBEDTLS_CIPHER_ARIA_192_CCM_STAR_NO_TAG: 164 case MBEDTLS_CIPHER_ARIA_256_CCM_STAR_NO_TAG: 165 case MBEDTLS_CIPHER_ARIA_128_GCM: 166 case MBEDTLS_CIPHER_ARIA_192_GCM: 167 case MBEDTLS_CIPHER_ARIA_256_GCM: 168 case MBEDTLS_CIPHER_ARIA_128_CBC: 169 case MBEDTLS_CIPHER_ARIA_192_CBC: 170 case MBEDTLS_CIPHER_ARIA_256_CBC: 171 return( PSA_KEY_TYPE_ARIA ); */ 172 173 default: 174 return 0; 175 } 176 } 177 178 static inline psa_algorithm_t mbedtls_psa_translate_cipher_mode( 179 mbedtls_cipher_mode_t mode, size_t taglen) 180 { 181 switch (mode) { 182 case MBEDTLS_MODE_ECB: 183 return PSA_ALG_ECB_NO_PADDING; 184 case MBEDTLS_MODE_GCM: 185 return PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_GCM, taglen); 186 case MBEDTLS_MODE_CCM: 187 return PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, taglen); 188 case MBEDTLS_MODE_CCM_STAR_NO_TAG: 189 return PSA_ALG_CCM_STAR_NO_TAG; 190 case MBEDTLS_MODE_CBC: 191 if (taglen == 0) { 192 return PSA_ALG_CBC_NO_PADDING; 193 } else { 194 return 0; 195 } 196 default: 197 return 0; 198 } 199 } 200 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 201 202 void mbedtls_cipher_init(mbedtls_cipher_context_t *ctx) 203 { 204 memset(ctx, 0, sizeof(mbedtls_cipher_context_t)); 205 } 206 207 void mbedtls_cipher_free(mbedtls_cipher_context_t *ctx) 208 { 209 if (ctx == NULL) { 210 return; 211 } 212 213 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 214 if (ctx->psa_enabled == 1) { 215 if (ctx->cipher_ctx != NULL) { 216 mbedtls_cipher_context_psa * const cipher_psa = 217 (mbedtls_cipher_context_psa *) ctx->cipher_ctx; 218 219 if (cipher_psa->slot_state == MBEDTLS_CIPHER_PSA_KEY_OWNED) { 220 /* xxx_free() doesn't allow to return failures. */ 221 (void) psa_destroy_key(cipher_psa->slot); 222 } 223 224 mbedtls_zeroize_and_free(cipher_psa, sizeof(*cipher_psa)); 225 } 226 227 mbedtls_platform_zeroize(ctx, sizeof(mbedtls_cipher_context_t)); 228 return; 229 } 230 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 231 232 #if defined(MBEDTLS_CMAC_C) 233 if (ctx->cmac_ctx) { 234 mbedtls_zeroize_and_free(ctx->cmac_ctx, 235 sizeof(mbedtls_cmac_context_t)); 236 } 237 #endif 238 239 if (ctx->cipher_ctx) { 240 mbedtls_cipher_get_base(ctx->cipher_info)->ctx_free_func(ctx->cipher_ctx); 241 } 242 243 mbedtls_platform_zeroize(ctx, sizeof(mbedtls_cipher_context_t)); 244 } 245 246 int mbedtls_cipher_setup(mbedtls_cipher_context_t *ctx, 247 const mbedtls_cipher_info_t *cipher_info) 248 { 249 if (cipher_info == NULL) { 250 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 251 } 252 253 memset(ctx, 0, sizeof(mbedtls_cipher_context_t)); 254 255 if (mbedtls_cipher_get_base(cipher_info)->ctx_alloc_func != NULL) { 256 ctx->cipher_ctx = mbedtls_cipher_get_base(cipher_info)->ctx_alloc_func(); 257 if (ctx->cipher_ctx == NULL) { 258 return MBEDTLS_ERR_CIPHER_ALLOC_FAILED; 259 } 260 } 261 262 ctx->cipher_info = cipher_info; 263 264 return 0; 265 } 266 267 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 268 int mbedtls_cipher_setup_psa(mbedtls_cipher_context_t *ctx, 269 const mbedtls_cipher_info_t *cipher_info, 270 size_t taglen) 271 { 272 psa_algorithm_t alg; 273 mbedtls_cipher_context_psa *cipher_psa; 274 275 if (NULL == cipher_info || NULL == ctx) { 276 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 277 } 278 279 /* Check that the underlying cipher mode and cipher type are 280 * supported by the underlying PSA Crypto implementation. */ 281 alg = mbedtls_psa_translate_cipher_mode(((mbedtls_cipher_mode_t) cipher_info->mode), taglen); 282 if (alg == 0) { 283 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 284 } 285 if (mbedtls_psa_translate_cipher_type(((mbedtls_cipher_type_t) cipher_info->type)) == 0) { 286 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 287 } 288 289 memset(ctx, 0, sizeof(mbedtls_cipher_context_t)); 290 291 cipher_psa = mbedtls_calloc(1, sizeof(mbedtls_cipher_context_psa)); 292 if (cipher_psa == NULL) { 293 return MBEDTLS_ERR_CIPHER_ALLOC_FAILED; 294 } 295 cipher_psa->alg = alg; 296 ctx->cipher_ctx = cipher_psa; 297 ctx->cipher_info = cipher_info; 298 ctx->psa_enabled = 1; 299 return 0; 300 } 301 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 302 303 int mbedtls_cipher_setkey(mbedtls_cipher_context_t *ctx, 304 const unsigned char *key, 305 int key_bitlen, 306 const mbedtls_operation_t operation) 307 { 308 if (operation != MBEDTLS_ENCRYPT && operation != MBEDTLS_DECRYPT) { 309 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 310 } 311 if (ctx->cipher_info == NULL) { 312 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 313 } 314 #if defined(MBEDTLS_BLOCK_CIPHER_NO_DECRYPT) 315 if (MBEDTLS_MODE_ECB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) && 316 MBEDTLS_DECRYPT == operation) { 317 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 318 } 319 #endif 320 321 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 322 if (ctx->psa_enabled == 1) { 323 mbedtls_cipher_context_psa * const cipher_psa = 324 (mbedtls_cipher_context_psa *) ctx->cipher_ctx; 325 326 size_t const key_bytelen = ((size_t) key_bitlen + 7) / 8; 327 328 psa_status_t status; 329 psa_key_type_t key_type; 330 psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; 331 332 /* PSA Crypto API only accepts byte-aligned keys. */ 333 if (key_bitlen % 8 != 0) { 334 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 335 } 336 337 /* Don't allow keys to be set multiple times. */ 338 if (cipher_psa->slot_state != MBEDTLS_CIPHER_PSA_KEY_UNSET) { 339 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 340 } 341 342 key_type = mbedtls_psa_translate_cipher_type( 343 ((mbedtls_cipher_type_t) ctx->cipher_info->type)); 344 if (key_type == 0) { 345 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 346 } 347 psa_set_key_type(&attributes, key_type); 348 349 /* Mbed TLS' cipher layer doesn't enforce the mode of operation 350 * (encrypt vs. decrypt): it is possible to setup a key for encryption 351 * and use it for AEAD decryption. Until tests relying on this 352 * are changed, allow any usage in PSA. */ 353 psa_set_key_usage_flags(&attributes, 354 PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT); 355 psa_set_key_algorithm(&attributes, cipher_psa->alg); 356 357 status = psa_import_key(&attributes, key, key_bytelen, 358 &cipher_psa->slot); 359 switch (status) { 360 case PSA_SUCCESS: 361 break; 362 case PSA_ERROR_INSUFFICIENT_MEMORY: 363 return MBEDTLS_ERR_CIPHER_ALLOC_FAILED; 364 case PSA_ERROR_NOT_SUPPORTED: 365 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 366 default: 367 return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; 368 } 369 /* Indicate that we own the key slot and need to 370 * destroy it in mbedtls_cipher_free(). */ 371 cipher_psa->slot_state = MBEDTLS_CIPHER_PSA_KEY_OWNED; 372 373 ctx->key_bitlen = key_bitlen; 374 ctx->operation = operation; 375 return 0; 376 } 377 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 378 379 if ((ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_KEY_LEN) == 0 && 380 (int) mbedtls_cipher_info_get_key_bitlen(ctx->cipher_info) != key_bitlen) { 381 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 382 } 383 384 ctx->key_bitlen = key_bitlen; 385 ctx->operation = operation; 386 387 #if !defined(MBEDTLS_BLOCK_CIPHER_NO_DECRYPT) 388 /* 389 * For OFB, CFB and CTR mode always use the encryption key schedule 390 */ 391 if (MBEDTLS_ENCRYPT == operation || 392 MBEDTLS_MODE_CFB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || 393 MBEDTLS_MODE_OFB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || 394 MBEDTLS_MODE_CTR == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { 395 return mbedtls_cipher_get_base(ctx->cipher_info)->setkey_enc_func(ctx->cipher_ctx, key, 396 ctx->key_bitlen); 397 } 398 399 if (MBEDTLS_DECRYPT == operation) { 400 return mbedtls_cipher_get_base(ctx->cipher_info)->setkey_dec_func(ctx->cipher_ctx, key, 401 ctx->key_bitlen); 402 } 403 #else 404 if (operation == MBEDTLS_ENCRYPT || operation == MBEDTLS_DECRYPT) { 405 return mbedtls_cipher_get_base(ctx->cipher_info)->setkey_enc_func(ctx->cipher_ctx, key, 406 ctx->key_bitlen); 407 } 408 #endif 409 410 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 411 } 412 413 int mbedtls_cipher_set_iv(mbedtls_cipher_context_t *ctx, 414 const unsigned char *iv, 415 size_t iv_len) 416 { 417 size_t actual_iv_size; 418 419 if (ctx->cipher_info == NULL) { 420 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 421 } 422 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 423 if (ctx->psa_enabled == 1) { 424 /* While PSA Crypto has an API for multipart 425 * operations, we currently don't make it 426 * accessible through the cipher layer. */ 427 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 428 } 429 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 430 431 /* avoid buffer overflow in ctx->iv */ 432 if (iv_len > MBEDTLS_MAX_IV_LENGTH) { 433 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 434 } 435 436 if ((ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_IV_LEN) != 0) { 437 actual_iv_size = iv_len; 438 } else { 439 actual_iv_size = mbedtls_cipher_info_get_iv_size(ctx->cipher_info); 440 441 /* avoid reading past the end of input buffer */ 442 if (actual_iv_size > iv_len) { 443 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 444 } 445 } 446 447 #if defined(MBEDTLS_CHACHA20_C) 448 if (((mbedtls_cipher_type_t) ctx->cipher_info->type) == MBEDTLS_CIPHER_CHACHA20) { 449 /* Even though the actual_iv_size is overwritten with a correct value 450 * of 12 from the cipher info, return an error to indicate that 451 * the input iv_len is wrong. */ 452 if (iv_len != 12) { 453 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 454 } 455 456 if (0 != mbedtls_chacha20_starts((mbedtls_chacha20_context *) ctx->cipher_ctx, 457 iv, 458 0U)) { /* Initial counter value */ 459 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 460 } 461 } 462 #if defined(MBEDTLS_CHACHAPOLY_C) 463 if (((mbedtls_cipher_type_t) ctx->cipher_info->type) == MBEDTLS_CIPHER_CHACHA20_POLY1305 && 464 iv_len != 12) { 465 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 466 } 467 #endif 468 #endif 469 470 #if defined(MBEDTLS_GCM_C) 471 if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { 472 return mbedtls_gcm_starts((mbedtls_gcm_context *) ctx->cipher_ctx, 473 ctx->operation, 474 iv, iv_len); 475 } 476 #endif 477 478 #if defined(MBEDTLS_CCM_C) 479 if (MBEDTLS_MODE_CCM_STAR_NO_TAG == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { 480 int set_lengths_result; 481 int ccm_star_mode; 482 483 set_lengths_result = mbedtls_ccm_set_lengths( 484 (mbedtls_ccm_context *) ctx->cipher_ctx, 485 0, 0, 0); 486 if (set_lengths_result != 0) { 487 return set_lengths_result; 488 } 489 490 if (ctx->operation == MBEDTLS_DECRYPT) { 491 ccm_star_mode = MBEDTLS_CCM_STAR_DECRYPT; 492 } else if (ctx->operation == MBEDTLS_ENCRYPT) { 493 ccm_star_mode = MBEDTLS_CCM_STAR_ENCRYPT; 494 } else { 495 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 496 } 497 498 return mbedtls_ccm_starts((mbedtls_ccm_context *) ctx->cipher_ctx, 499 ccm_star_mode, 500 iv, iv_len); 501 } 502 #endif 503 504 if (actual_iv_size != 0) { 505 memcpy(ctx->iv, iv, actual_iv_size); 506 ctx->iv_size = actual_iv_size; 507 } 508 509 return 0; 510 } 511 512 int mbedtls_cipher_reset(mbedtls_cipher_context_t *ctx) 513 { 514 if (ctx->cipher_info == NULL) { 515 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 516 } 517 518 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 519 if (ctx->psa_enabled == 1) { 520 /* We don't support resetting PSA-based 521 * cipher contexts, yet. */ 522 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 523 } 524 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 525 526 ctx->unprocessed_len = 0; 527 528 return 0; 529 } 530 531 #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C) 532 int mbedtls_cipher_update_ad(mbedtls_cipher_context_t *ctx, 533 const unsigned char *ad, size_t ad_len) 534 { 535 if (ctx->cipher_info == NULL) { 536 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 537 } 538 539 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 540 if (ctx->psa_enabled == 1) { 541 /* While PSA Crypto has an API for multipart 542 * operations, we currently don't make it 543 * accessible through the cipher layer. */ 544 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 545 } 546 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 547 548 #if defined(MBEDTLS_GCM_C) 549 if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { 550 return mbedtls_gcm_update_ad((mbedtls_gcm_context *) ctx->cipher_ctx, 551 ad, ad_len); 552 } 553 #endif 554 555 #if defined(MBEDTLS_CHACHAPOLY_C) 556 if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) { 557 int result; 558 mbedtls_chachapoly_mode_t mode; 559 560 mode = (ctx->operation == MBEDTLS_ENCRYPT) 561 ? MBEDTLS_CHACHAPOLY_ENCRYPT 562 : MBEDTLS_CHACHAPOLY_DECRYPT; 563 564 result = mbedtls_chachapoly_starts((mbedtls_chachapoly_context *) ctx->cipher_ctx, 565 ctx->iv, 566 mode); 567 if (result != 0) { 568 return result; 569 } 570 571 return mbedtls_chachapoly_update_aad((mbedtls_chachapoly_context *) ctx->cipher_ctx, 572 ad, ad_len); 573 } 574 #endif 575 576 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 577 } 578 #endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */ 579 580 int mbedtls_cipher_update(mbedtls_cipher_context_t *ctx, const unsigned char *input, 581 size_t ilen, unsigned char *output, size_t *olen) 582 { 583 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; 584 size_t block_size; 585 586 if (ctx->cipher_info == NULL) { 587 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 588 } 589 590 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 591 if (ctx->psa_enabled == 1) { 592 /* While PSA Crypto has an API for multipart 593 * operations, we currently don't make it 594 * accessible through the cipher layer. */ 595 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 596 } 597 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 598 599 *olen = 0; 600 block_size = mbedtls_cipher_get_block_size(ctx); 601 if (0 == block_size) { 602 return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT; 603 } 604 605 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_ECB) { 606 if (ilen != block_size) { 607 return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED; 608 } 609 610 *olen = ilen; 611 612 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->ecb_func(ctx->cipher_ctx, 613 ctx->operation, input, 614 output))) { 615 return ret; 616 } 617 618 return 0; 619 } 620 621 #if defined(MBEDTLS_GCM_C) 622 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_GCM) { 623 return mbedtls_gcm_update((mbedtls_gcm_context *) ctx->cipher_ctx, 624 input, ilen, 625 output, ilen, olen); 626 } 627 #endif 628 629 #if defined(MBEDTLS_CCM_C) 630 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_CCM_STAR_NO_TAG) { 631 return mbedtls_ccm_update((mbedtls_ccm_context *) ctx->cipher_ctx, 632 input, ilen, 633 output, ilen, olen); 634 } 635 #endif 636 637 #if defined(MBEDTLS_CHACHAPOLY_C) 638 if (((mbedtls_cipher_type_t) ctx->cipher_info->type) == MBEDTLS_CIPHER_CHACHA20_POLY1305) { 639 *olen = ilen; 640 return mbedtls_chachapoly_update((mbedtls_chachapoly_context *) ctx->cipher_ctx, 641 ilen, input, output); 642 } 643 #endif 644 645 if (input == output && 646 (ctx->unprocessed_len != 0 || ilen % block_size)) { 647 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 648 } 649 650 #if defined(MBEDTLS_CIPHER_MODE_CBC) 651 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_CBC) { 652 size_t copy_len = 0; 653 654 /* 655 * If there is not enough data for a full block, cache it. 656 */ 657 if ((ctx->operation == MBEDTLS_DECRYPT && NULL != ctx->add_padding && 658 ilen <= block_size - ctx->unprocessed_len) || 659 (ctx->operation == MBEDTLS_DECRYPT && NULL == ctx->add_padding && 660 ilen < block_size - ctx->unprocessed_len) || 661 (ctx->operation == MBEDTLS_ENCRYPT && 662 ilen < block_size - ctx->unprocessed_len)) { 663 memcpy(&(ctx->unprocessed_data[ctx->unprocessed_len]), input, 664 ilen); 665 666 ctx->unprocessed_len += ilen; 667 return 0; 668 } 669 670 /* 671 * Process cached data first 672 */ 673 if (0 != ctx->unprocessed_len) { 674 copy_len = block_size - ctx->unprocessed_len; 675 676 memcpy(&(ctx->unprocessed_data[ctx->unprocessed_len]), input, 677 copy_len); 678 679 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->cbc_func(ctx->cipher_ctx, 680 ctx->operation, 681 block_size, ctx->iv, 682 ctx-> 683 unprocessed_data, 684 output))) { 685 return ret; 686 } 687 688 *olen += block_size; 689 output += block_size; 690 ctx->unprocessed_len = 0; 691 692 input += copy_len; 693 ilen -= copy_len; 694 } 695 696 /* 697 * Cache final, incomplete block 698 */ 699 if (0 != ilen) { 700 /* Encryption: only cache partial blocks 701 * Decryption w/ padding: always keep at least one whole block 702 * Decryption w/o padding: only cache partial blocks 703 */ 704 copy_len = ilen % block_size; 705 if (copy_len == 0 && 706 ctx->operation == MBEDTLS_DECRYPT && 707 NULL != ctx->add_padding) { 708 copy_len = block_size; 709 } 710 711 memcpy(ctx->unprocessed_data, &(input[ilen - copy_len]), 712 copy_len); 713 714 ctx->unprocessed_len += copy_len; 715 ilen -= copy_len; 716 } 717 718 /* 719 * Process remaining full blocks 720 */ 721 if (ilen) { 722 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->cbc_func(ctx->cipher_ctx, 723 ctx->operation, 724 ilen, ctx->iv, 725 input, 726 output))) { 727 return ret; 728 } 729 730 *olen += ilen; 731 } 732 733 return 0; 734 } 735 #endif /* MBEDTLS_CIPHER_MODE_CBC */ 736 737 #if defined(MBEDTLS_CIPHER_MODE_CFB) 738 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_CFB) { 739 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->cfb_func(ctx->cipher_ctx, 740 ctx->operation, ilen, 741 &ctx->unprocessed_len, 742 ctx->iv, 743 input, output))) { 744 return ret; 745 } 746 747 *olen = ilen; 748 749 return 0; 750 } 751 #endif /* MBEDTLS_CIPHER_MODE_CFB */ 752 753 #if defined(MBEDTLS_CIPHER_MODE_OFB) 754 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_OFB) { 755 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->ofb_func(ctx->cipher_ctx, 756 ilen, 757 &ctx->unprocessed_len, 758 ctx->iv, 759 input, output))) { 760 return ret; 761 } 762 763 *olen = ilen; 764 765 return 0; 766 } 767 #endif /* MBEDTLS_CIPHER_MODE_OFB */ 768 769 #if defined(MBEDTLS_CIPHER_MODE_CTR) 770 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_CTR) { 771 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->ctr_func(ctx->cipher_ctx, 772 ilen, 773 &ctx->unprocessed_len, 774 ctx->iv, 775 ctx->unprocessed_data, 776 input, output))) { 777 return ret; 778 } 779 780 *olen = ilen; 781 782 return 0; 783 } 784 #endif /* MBEDTLS_CIPHER_MODE_CTR */ 785 786 #if defined(MBEDTLS_CIPHER_MODE_XTS) 787 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_XTS) { 788 if (ctx->unprocessed_len > 0) { 789 /* We can only process an entire data unit at a time. */ 790 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 791 } 792 793 ret = mbedtls_cipher_get_base(ctx->cipher_info)->xts_func(ctx->cipher_ctx, 794 ctx->operation, 795 ilen, 796 ctx->iv, 797 input, 798 output); 799 if (ret != 0) { 800 return ret; 801 } 802 803 *olen = ilen; 804 805 return 0; 806 } 807 #endif /* MBEDTLS_CIPHER_MODE_XTS */ 808 809 #if defined(MBEDTLS_CIPHER_MODE_STREAM) 810 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_STREAM) { 811 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->stream_func(ctx->cipher_ctx, 812 ilen, input, 813 output))) { 814 return ret; 815 } 816 817 *olen = ilen; 818 819 return 0; 820 } 821 #endif /* MBEDTLS_CIPHER_MODE_STREAM */ 822 823 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 824 } 825 826 #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING) 827 #if defined(MBEDTLS_CIPHER_PADDING_PKCS7) 828 /* 829 * PKCS7 (and PKCS5) padding: fill with ll bytes, with ll = padding_len 830 */ 831 static void add_pkcs_padding(unsigned char *output, size_t output_len, 832 size_t data_len) 833 { 834 size_t padding_len = output_len - data_len; 835 unsigned char i; 836 837 for (i = 0; i < padding_len; i++) { 838 output[data_len + i] = (unsigned char) padding_len; 839 } 840 } 841 842 /* 843 * Get the length of the PKCS7 padding. 844 * 845 * Note: input_len must be the block size of the cipher. 846 */ 847 MBEDTLS_STATIC_TESTABLE int mbedtls_get_pkcs_padding(unsigned char *input, 848 size_t input_len, 849 size_t *data_len) 850 { 851 size_t i, pad_idx; 852 unsigned char padding_len; 853 854 if (NULL == input || NULL == data_len) { 855 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 856 } 857 858 padding_len = input[input_len - 1]; 859 860 mbedtls_ct_condition_t bad = mbedtls_ct_uint_gt(padding_len, input_len); 861 bad = mbedtls_ct_bool_or(bad, mbedtls_ct_uint_eq(padding_len, 0)); 862 863 /* The number of bytes checked must be independent of padding_len, 864 * so pick input_len, which is usually 8 or 16 (one block) */ 865 pad_idx = input_len - padding_len; 866 for (i = 0; i < input_len; i++) { 867 mbedtls_ct_condition_t in_padding = mbedtls_ct_uint_ge(i, pad_idx); 868 mbedtls_ct_condition_t different = mbedtls_ct_uint_ne(input[i], padding_len); 869 bad = mbedtls_ct_bool_or(bad, mbedtls_ct_bool_and(in_padding, different)); 870 } 871 872 /* If the padding is invalid, set the output length to 0 */ 873 *data_len = mbedtls_ct_if(bad, 0, input_len - padding_len); 874 875 return mbedtls_ct_error_if_else_0(bad, MBEDTLS_ERR_CIPHER_INVALID_PADDING); 876 } 877 #endif /* MBEDTLS_CIPHER_PADDING_PKCS7 */ 878 879 #if defined(MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS) 880 /* 881 * One and zeros padding: fill with 80 00 ... 00 882 */ 883 static void add_one_and_zeros_padding(unsigned char *output, 884 size_t output_len, size_t data_len) 885 { 886 size_t padding_len = output_len - data_len; 887 unsigned char i = 0; 888 889 output[data_len] = 0x80; 890 for (i = 1; i < padding_len; i++) { 891 output[data_len + i] = 0x00; 892 } 893 } 894 895 static int get_one_and_zeros_padding(unsigned char *input, size_t input_len, 896 size_t *data_len) 897 { 898 if (NULL == input || NULL == data_len) { 899 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 900 } 901 902 mbedtls_ct_condition_t in_padding = MBEDTLS_CT_TRUE; 903 mbedtls_ct_condition_t bad = MBEDTLS_CT_TRUE; 904 905 *data_len = 0; 906 907 for (ptrdiff_t i = (ptrdiff_t) (input_len) - 1; i >= 0; i--) { 908 mbedtls_ct_condition_t is_nonzero = mbedtls_ct_bool(input[i]); 909 910 mbedtls_ct_condition_t hit_first_nonzero = mbedtls_ct_bool_and(is_nonzero, in_padding); 911 912 *data_len = mbedtls_ct_size_if(hit_first_nonzero, i, *data_len); 913 914 bad = mbedtls_ct_bool_if(hit_first_nonzero, mbedtls_ct_uint_ne(input[i], 0x80), bad); 915 916 in_padding = mbedtls_ct_bool_and(in_padding, mbedtls_ct_bool_not(is_nonzero)); 917 } 918 919 return mbedtls_ct_error_if_else_0(bad, MBEDTLS_ERR_CIPHER_INVALID_PADDING); 920 } 921 #endif /* MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS */ 922 923 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN) 924 /* 925 * Zeros and len padding: fill with 00 ... 00 ll, where ll is padding length 926 */ 927 static void add_zeros_and_len_padding(unsigned char *output, 928 size_t output_len, size_t data_len) 929 { 930 size_t padding_len = output_len - data_len; 931 unsigned char i = 0; 932 933 for (i = 1; i < padding_len; i++) { 934 output[data_len + i - 1] = 0x00; 935 } 936 output[output_len - 1] = (unsigned char) padding_len; 937 } 938 939 static int get_zeros_and_len_padding(unsigned char *input, size_t input_len, 940 size_t *data_len) 941 { 942 size_t i, pad_idx; 943 unsigned char padding_len; 944 mbedtls_ct_condition_t bad; 945 946 if (NULL == input || NULL == data_len) { 947 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 948 } 949 950 padding_len = input[input_len - 1]; 951 *data_len = input_len - padding_len; 952 953 /* Avoid logical || since it results in a branch */ 954 bad = mbedtls_ct_uint_gt(padding_len, input_len); 955 bad = mbedtls_ct_bool_or(bad, mbedtls_ct_uint_eq(padding_len, 0)); 956 957 /* The number of bytes checked must be independent of padding_len */ 958 pad_idx = input_len - padding_len; 959 for (i = 0; i < input_len - 1; i++) { 960 mbedtls_ct_condition_t is_padding = mbedtls_ct_uint_ge(i, pad_idx); 961 mbedtls_ct_condition_t nonzero_pad_byte; 962 nonzero_pad_byte = mbedtls_ct_bool_if_else_0(is_padding, mbedtls_ct_bool(input[i])); 963 bad = mbedtls_ct_bool_or(bad, nonzero_pad_byte); 964 } 965 966 return mbedtls_ct_error_if_else_0(bad, MBEDTLS_ERR_CIPHER_INVALID_PADDING); 967 } 968 #endif /* MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN */ 969 970 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS) 971 /* 972 * Zero padding: fill with 00 ... 00 973 */ 974 static void add_zeros_padding(unsigned char *output, 975 size_t output_len, size_t data_len) 976 { 977 memset(output + data_len, 0, output_len - data_len); 978 } 979 980 static int get_zeros_padding(unsigned char *input, size_t input_len, 981 size_t *data_len) 982 { 983 size_t i; 984 mbedtls_ct_condition_t done = MBEDTLS_CT_FALSE, prev_done; 985 986 if (NULL == input || NULL == data_len) { 987 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 988 } 989 990 *data_len = 0; 991 for (i = input_len; i > 0; i--) { 992 prev_done = done; 993 done = mbedtls_ct_bool_or(done, mbedtls_ct_uint_ne(input[i-1], 0)); 994 *data_len = mbedtls_ct_size_if(mbedtls_ct_bool_ne(done, prev_done), i, *data_len); 995 } 996 997 return 0; 998 } 999 #endif /* MBEDTLS_CIPHER_PADDING_ZEROS */ 1000 1001 /* 1002 * No padding: don't pad :) 1003 * 1004 * There is no add_padding function (check for NULL in mbedtls_cipher_finish) 1005 * but a trivial get_padding function 1006 */ 1007 static int get_no_padding(unsigned char *input, size_t input_len, 1008 size_t *data_len) 1009 { 1010 if (NULL == input || NULL == data_len) { 1011 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1012 } 1013 1014 *data_len = input_len; 1015 1016 return 0; 1017 } 1018 #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */ 1019 1020 int mbedtls_cipher_finish(mbedtls_cipher_context_t *ctx, 1021 unsigned char *output, size_t *olen) 1022 { 1023 if (ctx->cipher_info == NULL) { 1024 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1025 } 1026 1027 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 1028 if (ctx->psa_enabled == 1) { 1029 /* While PSA Crypto has an API for multipart 1030 * operations, we currently don't make it 1031 * accessible through the cipher layer. */ 1032 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 1033 } 1034 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 1035 1036 *olen = 0; 1037 1038 #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING) 1039 /* CBC mode requires padding so we make sure a call to 1040 * mbedtls_cipher_set_padding_mode has been done successfully. */ 1041 if (MBEDTLS_MODE_CBC == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { 1042 if (ctx->get_padding == NULL) { 1043 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1044 } 1045 } 1046 #endif 1047 1048 if (MBEDTLS_MODE_CFB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || 1049 MBEDTLS_MODE_OFB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || 1050 MBEDTLS_MODE_CTR == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || 1051 MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || 1052 MBEDTLS_MODE_CCM_STAR_NO_TAG == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || 1053 MBEDTLS_MODE_XTS == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || 1054 MBEDTLS_MODE_STREAM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { 1055 return 0; 1056 } 1057 1058 if ((MBEDTLS_CIPHER_CHACHA20 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) || 1059 (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type))) { 1060 return 0; 1061 } 1062 1063 if (MBEDTLS_MODE_ECB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { 1064 if (ctx->unprocessed_len != 0) { 1065 return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED; 1066 } 1067 1068 return 0; 1069 } 1070 1071 #if defined(MBEDTLS_CIPHER_MODE_CBC) 1072 if (MBEDTLS_MODE_CBC == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { 1073 int ret = 0; 1074 1075 if (MBEDTLS_ENCRYPT == ctx->operation) { 1076 /* check for 'no padding' mode */ 1077 if (NULL == ctx->add_padding) { 1078 if (0 != ctx->unprocessed_len) { 1079 return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED; 1080 } 1081 1082 return 0; 1083 } 1084 1085 ctx->add_padding(ctx->unprocessed_data, mbedtls_cipher_get_iv_size(ctx), 1086 ctx->unprocessed_len); 1087 } else if (mbedtls_cipher_get_block_size(ctx) != ctx->unprocessed_len) { 1088 /* 1089 * For decrypt operations, expect a full block, 1090 * or an empty block if no padding 1091 */ 1092 if (NULL == ctx->add_padding && 0 == ctx->unprocessed_len) { 1093 return 0; 1094 } 1095 1096 return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED; 1097 } 1098 1099 /* cipher block */ 1100 if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->cbc_func(ctx->cipher_ctx, 1101 ctx->operation, 1102 mbedtls_cipher_get_block_size( 1103 ctx), 1104 ctx->iv, 1105 ctx->unprocessed_data, 1106 output))) { 1107 return ret; 1108 } 1109 1110 /* Set output size for decryption */ 1111 if (MBEDTLS_DECRYPT == ctx->operation) { 1112 return ctx->get_padding(output, mbedtls_cipher_get_block_size(ctx), 1113 olen); 1114 } 1115 1116 /* Set output size for encryption */ 1117 *olen = mbedtls_cipher_get_block_size(ctx); 1118 return 0; 1119 } 1120 #else 1121 ((void) output); 1122 #endif /* MBEDTLS_CIPHER_MODE_CBC */ 1123 1124 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 1125 } 1126 1127 #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING) 1128 int mbedtls_cipher_set_padding_mode(mbedtls_cipher_context_t *ctx, 1129 mbedtls_cipher_padding_t mode) 1130 { 1131 if (NULL == ctx->cipher_info || 1132 MBEDTLS_MODE_CBC != ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { 1133 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1134 } 1135 1136 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 1137 if (ctx->psa_enabled == 1) { 1138 /* While PSA Crypto knows about CBC padding 1139 * schemes, we currently don't make them 1140 * accessible through the cipher layer. */ 1141 if (mode != MBEDTLS_PADDING_NONE) { 1142 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 1143 } 1144 1145 return 0; 1146 } 1147 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 1148 1149 switch (mode) { 1150 #if defined(MBEDTLS_CIPHER_PADDING_PKCS7) 1151 case MBEDTLS_PADDING_PKCS7: 1152 ctx->add_padding = add_pkcs_padding; 1153 ctx->get_padding = mbedtls_get_pkcs_padding; 1154 break; 1155 #endif 1156 #if defined(MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS) 1157 case MBEDTLS_PADDING_ONE_AND_ZEROS: 1158 ctx->add_padding = add_one_and_zeros_padding; 1159 ctx->get_padding = get_one_and_zeros_padding; 1160 break; 1161 #endif 1162 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN) 1163 case MBEDTLS_PADDING_ZEROS_AND_LEN: 1164 ctx->add_padding = add_zeros_and_len_padding; 1165 ctx->get_padding = get_zeros_and_len_padding; 1166 break; 1167 #endif 1168 #if defined(MBEDTLS_CIPHER_PADDING_ZEROS) 1169 case MBEDTLS_PADDING_ZEROS: 1170 ctx->add_padding = add_zeros_padding; 1171 ctx->get_padding = get_zeros_padding; 1172 break; 1173 #endif 1174 case MBEDTLS_PADDING_NONE: 1175 ctx->add_padding = NULL; 1176 ctx->get_padding = get_no_padding; 1177 break; 1178 1179 default: 1180 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 1181 } 1182 1183 return 0; 1184 } 1185 #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */ 1186 1187 #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C) 1188 int mbedtls_cipher_write_tag(mbedtls_cipher_context_t *ctx, 1189 unsigned char *tag, size_t tag_len) 1190 { 1191 if (ctx->cipher_info == NULL) { 1192 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1193 } 1194 1195 if (MBEDTLS_ENCRYPT != ctx->operation) { 1196 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1197 } 1198 1199 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 1200 if (ctx->psa_enabled == 1) { 1201 /* While PSA Crypto has an API for multipart 1202 * operations, we currently don't make it 1203 * accessible through the cipher layer. */ 1204 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 1205 } 1206 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 1207 1208 #if defined(MBEDTLS_GCM_C) 1209 if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { 1210 size_t output_length; 1211 /* The code here doesn't yet support alternative implementations 1212 * that can delay up to a block of output. */ 1213 return mbedtls_gcm_finish((mbedtls_gcm_context *) ctx->cipher_ctx, 1214 NULL, 0, &output_length, 1215 tag, tag_len); 1216 } 1217 #endif 1218 1219 #if defined(MBEDTLS_CHACHAPOLY_C) 1220 if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) { 1221 /* Don't allow truncated MAC for Poly1305 */ 1222 if (tag_len != 16U) { 1223 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1224 } 1225 1226 return mbedtls_chachapoly_finish( 1227 (mbedtls_chachapoly_context *) ctx->cipher_ctx, tag); 1228 } 1229 #endif 1230 1231 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 1232 } 1233 1234 int mbedtls_cipher_check_tag(mbedtls_cipher_context_t *ctx, 1235 const unsigned char *tag, size_t tag_len) 1236 { 1237 unsigned char check_tag[16]; 1238 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; 1239 1240 if (ctx->cipher_info == NULL) { 1241 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1242 } 1243 1244 if (MBEDTLS_DECRYPT != ctx->operation) { 1245 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1246 } 1247 1248 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 1249 if (ctx->psa_enabled == 1) { 1250 /* While PSA Crypto has an API for multipart 1251 * operations, we currently don't make it 1252 * accessible through the cipher layer. */ 1253 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 1254 } 1255 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 1256 1257 /* Status to return on a non-authenticated algorithm. */ 1258 ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 1259 1260 #if defined(MBEDTLS_GCM_C) 1261 if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { 1262 size_t output_length; 1263 /* The code here doesn't yet support alternative implementations 1264 * that can delay up to a block of output. */ 1265 1266 if (tag_len > sizeof(check_tag)) { 1267 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1268 } 1269 1270 if (0 != (ret = mbedtls_gcm_finish( 1271 (mbedtls_gcm_context *) ctx->cipher_ctx, 1272 NULL, 0, &output_length, 1273 check_tag, tag_len))) { 1274 return ret; 1275 } 1276 1277 /* Check the tag in "constant-time" */ 1278 if (mbedtls_ct_memcmp(tag, check_tag, tag_len) != 0) { 1279 ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED; 1280 goto exit; 1281 } 1282 } 1283 #endif /* MBEDTLS_GCM_C */ 1284 1285 #if defined(MBEDTLS_CHACHAPOLY_C) 1286 if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) { 1287 /* Don't allow truncated MAC for Poly1305 */ 1288 if (tag_len != sizeof(check_tag)) { 1289 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1290 } 1291 1292 ret = mbedtls_chachapoly_finish( 1293 (mbedtls_chachapoly_context *) ctx->cipher_ctx, check_tag); 1294 if (ret != 0) { 1295 return ret; 1296 } 1297 1298 /* Check the tag in "constant-time" */ 1299 if (mbedtls_ct_memcmp(tag, check_tag, tag_len) != 0) { 1300 ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED; 1301 goto exit; 1302 } 1303 } 1304 #endif /* MBEDTLS_CHACHAPOLY_C */ 1305 1306 exit: 1307 mbedtls_platform_zeroize(check_tag, tag_len); 1308 return ret; 1309 } 1310 #endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */ 1311 1312 /* 1313 * Packet-oriented wrapper for non-AEAD modes 1314 */ 1315 int mbedtls_cipher_crypt(mbedtls_cipher_context_t *ctx, 1316 const unsigned char *iv, size_t iv_len, 1317 const unsigned char *input, size_t ilen, 1318 unsigned char *output, size_t *olen) 1319 { 1320 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; 1321 size_t finish_olen; 1322 1323 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 1324 if (ctx->psa_enabled == 1) { 1325 /* As in the non-PSA case, we don't check that 1326 * a key has been set. If not, the key slot will 1327 * still be in its default state of 0, which is 1328 * guaranteed to be invalid, hence the PSA-call 1329 * below will gracefully fail. */ 1330 mbedtls_cipher_context_psa * const cipher_psa = 1331 (mbedtls_cipher_context_psa *) ctx->cipher_ctx; 1332 1333 psa_status_t status; 1334 psa_cipher_operation_t cipher_op = PSA_CIPHER_OPERATION_INIT; 1335 size_t part_len; 1336 1337 if (ctx->operation == MBEDTLS_DECRYPT) { 1338 status = psa_cipher_decrypt_setup(&cipher_op, 1339 cipher_psa->slot, 1340 cipher_psa->alg); 1341 } else if (ctx->operation == MBEDTLS_ENCRYPT) { 1342 status = psa_cipher_encrypt_setup(&cipher_op, 1343 cipher_psa->slot, 1344 cipher_psa->alg); 1345 } else { 1346 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1347 } 1348 1349 /* In the following, we can immediately return on an error, 1350 * because the PSA Crypto API guarantees that cipher operations 1351 * are terminated by unsuccessful calls to psa_cipher_update(), 1352 * and by any call to psa_cipher_finish(). */ 1353 if (status != PSA_SUCCESS) { 1354 return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; 1355 } 1356 1357 if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) != MBEDTLS_MODE_ECB) { 1358 status = psa_cipher_set_iv(&cipher_op, iv, iv_len); 1359 if (status != PSA_SUCCESS) { 1360 return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; 1361 } 1362 } 1363 1364 status = psa_cipher_update(&cipher_op, 1365 input, ilen, 1366 output, ilen, olen); 1367 if (status != PSA_SUCCESS) { 1368 return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; 1369 } 1370 1371 status = psa_cipher_finish(&cipher_op, 1372 output + *olen, ilen - *olen, 1373 &part_len); 1374 if (status != PSA_SUCCESS) { 1375 return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; 1376 } 1377 1378 *olen += part_len; 1379 return 0; 1380 } 1381 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 1382 1383 if ((ret = mbedtls_cipher_set_iv(ctx, iv, iv_len)) != 0) { 1384 return ret; 1385 } 1386 1387 if ((ret = mbedtls_cipher_reset(ctx)) != 0) { 1388 return ret; 1389 } 1390 1391 if ((ret = mbedtls_cipher_update(ctx, input, ilen, 1392 output, olen)) != 0) { 1393 return ret; 1394 } 1395 1396 if ((ret = mbedtls_cipher_finish(ctx, output + *olen, 1397 &finish_olen)) != 0) { 1398 return ret; 1399 } 1400 1401 *olen += finish_olen; 1402 1403 return 0; 1404 } 1405 1406 #if defined(MBEDTLS_CIPHER_MODE_AEAD) 1407 /* 1408 * Packet-oriented encryption for AEAD modes: internal function used by 1409 * mbedtls_cipher_auth_encrypt_ext(). 1410 */ 1411 static int mbedtls_cipher_aead_encrypt(mbedtls_cipher_context_t *ctx, 1412 const unsigned char *iv, size_t iv_len, 1413 const unsigned char *ad, size_t ad_len, 1414 const unsigned char *input, size_t ilen, 1415 unsigned char *output, size_t *olen, 1416 unsigned char *tag, size_t tag_len) 1417 { 1418 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 1419 if (ctx->psa_enabled == 1) { 1420 /* As in the non-PSA case, we don't check that 1421 * a key has been set. If not, the key slot will 1422 * still be in its default state of 0, which is 1423 * guaranteed to be invalid, hence the PSA-call 1424 * below will gracefully fail. */ 1425 mbedtls_cipher_context_psa * const cipher_psa = 1426 (mbedtls_cipher_context_psa *) ctx->cipher_ctx; 1427 1428 psa_status_t status; 1429 1430 /* PSA Crypto API always writes the authentication tag 1431 * at the end of the encrypted message. */ 1432 if (output == NULL || tag != output + ilen) { 1433 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 1434 } 1435 1436 status = psa_aead_encrypt(cipher_psa->slot, 1437 cipher_psa->alg, 1438 iv, iv_len, 1439 ad, ad_len, 1440 input, ilen, 1441 output, ilen + tag_len, olen); 1442 if (status != PSA_SUCCESS) { 1443 return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; 1444 } 1445 1446 *olen -= tag_len; 1447 return 0; 1448 } 1449 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 1450 1451 #if defined(MBEDTLS_GCM_C) 1452 if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { 1453 *olen = ilen; 1454 return mbedtls_gcm_crypt_and_tag(ctx->cipher_ctx, MBEDTLS_GCM_ENCRYPT, 1455 ilen, iv, iv_len, ad, ad_len, 1456 input, output, tag_len, tag); 1457 } 1458 #endif /* MBEDTLS_GCM_C */ 1459 #if defined(MBEDTLS_CCM_C) 1460 if (MBEDTLS_MODE_CCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { 1461 *olen = ilen; 1462 return mbedtls_ccm_encrypt_and_tag(ctx->cipher_ctx, ilen, 1463 iv, iv_len, ad, ad_len, input, output, 1464 tag, tag_len); 1465 } 1466 #endif /* MBEDTLS_CCM_C */ 1467 #if defined(MBEDTLS_CHACHAPOLY_C) 1468 if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) { 1469 /* ChachaPoly has fixed length nonce and MAC (tag) */ 1470 if ((iv_len != mbedtls_cipher_info_get_iv_size(ctx->cipher_info)) || 1471 (tag_len != 16U)) { 1472 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1473 } 1474 1475 *olen = ilen; 1476 return mbedtls_chachapoly_encrypt_and_tag(ctx->cipher_ctx, 1477 ilen, iv, ad, ad_len, input, output, tag); 1478 } 1479 #endif /* MBEDTLS_CHACHAPOLY_C */ 1480 1481 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 1482 } 1483 1484 /* 1485 * Packet-oriented encryption for AEAD modes: internal function used by 1486 * mbedtls_cipher_auth_encrypt_ext(). 1487 */ 1488 static int mbedtls_cipher_aead_decrypt(mbedtls_cipher_context_t *ctx, 1489 const unsigned char *iv, size_t iv_len, 1490 const unsigned char *ad, size_t ad_len, 1491 const unsigned char *input, size_t ilen, 1492 unsigned char *output, size_t *olen, 1493 const unsigned char *tag, size_t tag_len) 1494 { 1495 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 1496 if (ctx->psa_enabled == 1) { 1497 /* As in the non-PSA case, we don't check that 1498 * a key has been set. If not, the key slot will 1499 * still be in its default state of 0, which is 1500 * guaranteed to be invalid, hence the PSA-call 1501 * below will gracefully fail. */ 1502 mbedtls_cipher_context_psa * const cipher_psa = 1503 (mbedtls_cipher_context_psa *) ctx->cipher_ctx; 1504 1505 psa_status_t status; 1506 1507 /* PSA Crypto API always writes the authentication tag 1508 * at the end of the encrypted message. */ 1509 if (input == NULL || tag != input + ilen) { 1510 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 1511 } 1512 1513 status = psa_aead_decrypt(cipher_psa->slot, 1514 cipher_psa->alg, 1515 iv, iv_len, 1516 ad, ad_len, 1517 input, ilen + tag_len, 1518 output, ilen, olen); 1519 if (status == PSA_ERROR_INVALID_SIGNATURE) { 1520 return MBEDTLS_ERR_CIPHER_AUTH_FAILED; 1521 } else if (status != PSA_SUCCESS) { 1522 return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; 1523 } 1524 1525 return 0; 1526 } 1527 #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ 1528 1529 #if defined(MBEDTLS_GCM_C) 1530 if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { 1531 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; 1532 1533 *olen = ilen; 1534 ret = mbedtls_gcm_auth_decrypt(ctx->cipher_ctx, ilen, 1535 iv, iv_len, ad, ad_len, 1536 tag, tag_len, input, output); 1537 1538 if (ret == MBEDTLS_ERR_GCM_AUTH_FAILED) { 1539 ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED; 1540 } 1541 1542 return ret; 1543 } 1544 #endif /* MBEDTLS_GCM_C */ 1545 #if defined(MBEDTLS_CCM_C) 1546 if (MBEDTLS_MODE_CCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { 1547 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; 1548 1549 *olen = ilen; 1550 ret = mbedtls_ccm_auth_decrypt(ctx->cipher_ctx, ilen, 1551 iv, iv_len, ad, ad_len, 1552 input, output, tag, tag_len); 1553 1554 if (ret == MBEDTLS_ERR_CCM_AUTH_FAILED) { 1555 ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED; 1556 } 1557 1558 return ret; 1559 } 1560 #endif /* MBEDTLS_CCM_C */ 1561 #if defined(MBEDTLS_CHACHAPOLY_C) 1562 if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) { 1563 int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; 1564 1565 /* ChachaPoly has fixed length nonce and MAC (tag) */ 1566 if ((iv_len != mbedtls_cipher_info_get_iv_size(ctx->cipher_info)) || 1567 (tag_len != 16U)) { 1568 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1569 } 1570 1571 *olen = ilen; 1572 ret = mbedtls_chachapoly_auth_decrypt(ctx->cipher_ctx, ilen, 1573 iv, ad, ad_len, tag, input, output); 1574 1575 if (ret == MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED) { 1576 ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED; 1577 } 1578 1579 return ret; 1580 } 1581 #endif /* MBEDTLS_CHACHAPOLY_C */ 1582 1583 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 1584 } 1585 #endif /* MBEDTLS_CIPHER_MODE_AEAD */ 1586 1587 #if defined(MBEDTLS_CIPHER_MODE_AEAD) || defined(MBEDTLS_NIST_KW_C) 1588 /* 1589 * Packet-oriented encryption for AEAD/NIST_KW: public function. 1590 */ 1591 int mbedtls_cipher_auth_encrypt_ext(mbedtls_cipher_context_t *ctx, 1592 const unsigned char *iv, size_t iv_len, 1593 const unsigned char *ad, size_t ad_len, 1594 const unsigned char *input, size_t ilen, 1595 unsigned char *output, size_t output_len, 1596 size_t *olen, size_t tag_len) 1597 { 1598 #if defined(MBEDTLS_NIST_KW_C) 1599 if ( 1600 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 1601 ctx->psa_enabled == 0 && 1602 #endif 1603 (MBEDTLS_MODE_KW == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || 1604 MBEDTLS_MODE_KWP == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode))) { 1605 mbedtls_nist_kw_mode_t mode = 1606 (MBEDTLS_MODE_KW == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) ? 1607 MBEDTLS_KW_MODE_KW : MBEDTLS_KW_MODE_KWP; 1608 1609 /* There is no iv, tag or ad associated with KW and KWP, 1610 * so these length should be 0 as documented. */ 1611 if (iv_len != 0 || tag_len != 0 || ad_len != 0) { 1612 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1613 } 1614 1615 (void) iv; 1616 (void) ad; 1617 1618 return mbedtls_nist_kw_wrap(ctx->cipher_ctx, mode, input, ilen, 1619 output, olen, output_len); 1620 } 1621 #endif /* MBEDTLS_NIST_KW_C */ 1622 1623 #if defined(MBEDTLS_CIPHER_MODE_AEAD) 1624 /* AEAD case: check length before passing on to shared function */ 1625 if (output_len < ilen + tag_len) { 1626 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1627 } 1628 1629 int ret = mbedtls_cipher_aead_encrypt(ctx, iv, iv_len, ad, ad_len, 1630 input, ilen, output, olen, 1631 output + ilen, tag_len); 1632 *olen += tag_len; 1633 return ret; 1634 #else 1635 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 1636 #endif /* MBEDTLS_CIPHER_MODE_AEAD */ 1637 } 1638 1639 /* 1640 * Packet-oriented decryption for AEAD/NIST_KW: public function. 1641 */ 1642 int mbedtls_cipher_auth_decrypt_ext(mbedtls_cipher_context_t *ctx, 1643 const unsigned char *iv, size_t iv_len, 1644 const unsigned char *ad, size_t ad_len, 1645 const unsigned char *input, size_t ilen, 1646 unsigned char *output, size_t output_len, 1647 size_t *olen, size_t tag_len) 1648 { 1649 #if defined(MBEDTLS_NIST_KW_C) 1650 if ( 1651 #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) 1652 ctx->psa_enabled == 0 && 1653 #endif 1654 (MBEDTLS_MODE_KW == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || 1655 MBEDTLS_MODE_KWP == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode))) { 1656 mbedtls_nist_kw_mode_t mode = 1657 (MBEDTLS_MODE_KW == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) ? 1658 MBEDTLS_KW_MODE_KW : MBEDTLS_KW_MODE_KWP; 1659 1660 /* There is no iv, tag or ad associated with KW and KWP, 1661 * so these length should be 0 as documented. */ 1662 if (iv_len != 0 || tag_len != 0 || ad_len != 0) { 1663 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1664 } 1665 1666 (void) iv; 1667 (void) ad; 1668 1669 return mbedtls_nist_kw_unwrap(ctx->cipher_ctx, mode, input, ilen, 1670 output, olen, output_len); 1671 } 1672 #endif /* MBEDTLS_NIST_KW_C */ 1673 1674 #if defined(MBEDTLS_CIPHER_MODE_AEAD) 1675 /* AEAD case: check length before passing on to shared function */ 1676 if (ilen < tag_len || output_len < ilen - tag_len) { 1677 return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; 1678 } 1679 1680 return mbedtls_cipher_aead_decrypt(ctx, iv, iv_len, ad, ad_len, 1681 input, ilen - tag_len, output, olen, 1682 input + ilen - tag_len, tag_len); 1683 #else 1684 return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; 1685 #endif /* MBEDTLS_CIPHER_MODE_AEAD */ 1686 } 1687 #endif /* MBEDTLS_CIPHER_MODE_AEAD || MBEDTLS_NIST_KW_C */ 1688 1689 #endif /* MBEDTLS_CIPHER_C */