| /** |
| * \file cipher.c |
| * |
| * \brief Generic cipher wrapper for Mbed TLS |
| * |
| * \author Adriaan de Jong <dejong@fox-it.com> |
| * |
| * Copyright The Mbed TLS Contributors |
| * SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later |
| */ |
| |
| #include "common.h" |
| |
| #if defined(MBEDTLS_CIPHER_C) |
| |
| #include "mbedtls/cipher.h" |
| #include "cipher_invasive.h" |
| #include "cipher_wrap.h" |
| #include "mbedtls/platform_util.h" |
| #include "mbedtls/error.h" |
| #include "mbedtls/constant_time.h" |
| #include "constant_time_internal.h" |
| |
| #include <stdlib.h> |
| #include <string.h> |
| |
| #if defined(MBEDTLS_CHACHAPOLY_C) |
| #include "mbedtls/chachapoly.h" |
| #endif |
| |
| #if defined(MBEDTLS_GCM_C) |
| #include "mbedtls/gcm.h" |
| #endif |
| |
| #if defined(MBEDTLS_CCM_C) |
| #include "mbedtls/ccm.h" |
| #endif |
| |
| #if defined(MBEDTLS_CHACHA20_C) |
| #include "mbedtls/chacha20.h" |
| #endif |
| |
| #if defined(MBEDTLS_CMAC_C) |
| #include "mbedtls/cmac.h" |
| #endif |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| #include "psa/crypto.h" |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| #if defined(MBEDTLS_NIST_KW_C) |
| #include "mbedtls/nist_kw.h" |
| #endif |
| |
| #include "mbedtls/platform.h" |
| |
| static int supported_init = 0; |
| |
| static inline const mbedtls_cipher_base_t *mbedtls_cipher_get_base( |
| const mbedtls_cipher_info_t *info) |
| { |
| return mbedtls_cipher_base_lookup_table[info->base_idx]; |
| } |
| |
| const int *mbedtls_cipher_list(void) |
| { |
| const mbedtls_cipher_definition_t *def; |
| int *type; |
| |
| if (!supported_init) { |
| def = mbedtls_cipher_definitions; |
| type = mbedtls_cipher_supported; |
| |
| while (def->type != 0) { |
| *type++ = (*def++).type; |
| } |
| |
| *type = 0; |
| |
| supported_init = 1; |
| } |
| |
| return mbedtls_cipher_supported; |
| } |
| |
| const mbedtls_cipher_info_t *mbedtls_cipher_info_from_type( |
| const mbedtls_cipher_type_t cipher_type) |
| { |
| const mbedtls_cipher_definition_t *def; |
| |
| for (def = mbedtls_cipher_definitions; def->info != NULL; def++) { |
| if (def->type == cipher_type) { |
| return def->info; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| const mbedtls_cipher_info_t *mbedtls_cipher_info_from_string( |
| const char *cipher_name) |
| { |
| const mbedtls_cipher_definition_t *def; |
| |
| if (NULL == cipher_name) { |
| return NULL; |
| } |
| |
| for (def = mbedtls_cipher_definitions; def->info != NULL; def++) { |
| if (!strcmp(def->info->name, cipher_name)) { |
| return def->info; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| const mbedtls_cipher_info_t *mbedtls_cipher_info_from_values( |
| const mbedtls_cipher_id_t cipher_id, |
| int key_bitlen, |
| const mbedtls_cipher_mode_t mode) |
| { |
| const mbedtls_cipher_definition_t *def; |
| |
| for (def = mbedtls_cipher_definitions; def->info != NULL; def++) { |
| if (mbedtls_cipher_get_base(def->info)->cipher == cipher_id && |
| mbedtls_cipher_info_get_key_bitlen(def->info) == (unsigned) key_bitlen && |
| def->info->mode == mode) { |
| return def->info; |
| } |
| } |
| |
| return NULL; |
| } |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| static inline psa_key_type_t mbedtls_psa_translate_cipher_type( |
| mbedtls_cipher_type_t cipher) |
| { |
| switch (cipher) { |
| case MBEDTLS_CIPHER_AES_128_CCM: |
| case MBEDTLS_CIPHER_AES_192_CCM: |
| case MBEDTLS_CIPHER_AES_256_CCM: |
| case MBEDTLS_CIPHER_AES_128_CCM_STAR_NO_TAG: |
| case MBEDTLS_CIPHER_AES_192_CCM_STAR_NO_TAG: |
| case MBEDTLS_CIPHER_AES_256_CCM_STAR_NO_TAG: |
| case MBEDTLS_CIPHER_AES_128_GCM: |
| case MBEDTLS_CIPHER_AES_192_GCM: |
| case MBEDTLS_CIPHER_AES_256_GCM: |
| case MBEDTLS_CIPHER_AES_128_CBC: |
| case MBEDTLS_CIPHER_AES_192_CBC: |
| case MBEDTLS_CIPHER_AES_256_CBC: |
| case MBEDTLS_CIPHER_AES_128_ECB: |
| case MBEDTLS_CIPHER_AES_192_ECB: |
| case MBEDTLS_CIPHER_AES_256_ECB: |
| return PSA_KEY_TYPE_AES; |
| |
| /* ARIA not yet supported in PSA. */ |
| /* case MBEDTLS_CIPHER_ARIA_128_CCM: |
| case MBEDTLS_CIPHER_ARIA_192_CCM: |
| case MBEDTLS_CIPHER_ARIA_256_CCM: |
| case MBEDTLS_CIPHER_ARIA_128_CCM_STAR_NO_TAG: |
| case MBEDTLS_CIPHER_ARIA_192_CCM_STAR_NO_TAG: |
| case MBEDTLS_CIPHER_ARIA_256_CCM_STAR_NO_TAG: |
| case MBEDTLS_CIPHER_ARIA_128_GCM: |
| case MBEDTLS_CIPHER_ARIA_192_GCM: |
| case MBEDTLS_CIPHER_ARIA_256_GCM: |
| case MBEDTLS_CIPHER_ARIA_128_CBC: |
| case MBEDTLS_CIPHER_ARIA_192_CBC: |
| case MBEDTLS_CIPHER_ARIA_256_CBC: |
| return( PSA_KEY_TYPE_ARIA ); */ |
| |
| default: |
| return 0; |
| } |
| } |
| |
| static inline psa_algorithm_t mbedtls_psa_translate_cipher_mode( |
| mbedtls_cipher_mode_t mode, size_t taglen) |
| { |
| switch (mode) { |
| case MBEDTLS_MODE_ECB: |
| return PSA_ALG_ECB_NO_PADDING; |
| case MBEDTLS_MODE_GCM: |
| return PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_GCM, taglen); |
| case MBEDTLS_MODE_CCM: |
| return PSA_ALG_AEAD_WITH_SHORTENED_TAG(PSA_ALG_CCM, taglen); |
| case MBEDTLS_MODE_CCM_STAR_NO_TAG: |
| return PSA_ALG_CCM_STAR_NO_TAG; |
| case MBEDTLS_MODE_CBC: |
| if (taglen == 0) { |
| return PSA_ALG_CBC_NO_PADDING; |
| } else { |
| return 0; |
| } |
| default: |
| return 0; |
| } |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| void mbedtls_cipher_init(mbedtls_cipher_context_t *ctx) |
| { |
| memset(ctx, 0, sizeof(mbedtls_cipher_context_t)); |
| } |
| |
| void mbedtls_cipher_free(mbedtls_cipher_context_t *ctx) |
| { |
| if (ctx == NULL) { |
| return; |
| } |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| if (ctx->psa_enabled == 1) { |
| if (ctx->cipher_ctx != NULL) { |
| mbedtls_cipher_context_psa * const cipher_psa = |
| (mbedtls_cipher_context_psa *) ctx->cipher_ctx; |
| |
| if (cipher_psa->slot_state == MBEDTLS_CIPHER_PSA_KEY_OWNED) { |
| /* xxx_free() doesn't allow to return failures. */ |
| (void) psa_destroy_key(cipher_psa->slot); |
| } |
| |
| mbedtls_zeroize_and_free(cipher_psa, sizeof(*cipher_psa)); |
| } |
| |
| mbedtls_platform_zeroize(ctx, sizeof(mbedtls_cipher_context_t)); |
| return; |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| #if defined(MBEDTLS_CMAC_C) |
| if (ctx->cmac_ctx) { |
| mbedtls_zeroize_and_free(ctx->cmac_ctx, |
| sizeof(mbedtls_cmac_context_t)); |
| } |
| #endif |
| |
| if (ctx->cipher_ctx) { |
| mbedtls_cipher_get_base(ctx->cipher_info)->ctx_free_func(ctx->cipher_ctx); |
| } |
| |
| mbedtls_platform_zeroize(ctx, sizeof(mbedtls_cipher_context_t)); |
| } |
| |
| int mbedtls_cipher_setup(mbedtls_cipher_context_t *ctx, |
| const mbedtls_cipher_info_t *cipher_info) |
| { |
| if (cipher_info == NULL) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| memset(ctx, 0, sizeof(mbedtls_cipher_context_t)); |
| |
| if (mbedtls_cipher_get_base(cipher_info)->ctx_alloc_func != NULL) { |
| ctx->cipher_ctx = mbedtls_cipher_get_base(cipher_info)->ctx_alloc_func(); |
| if (ctx->cipher_ctx == NULL) { |
| return MBEDTLS_ERR_CIPHER_ALLOC_FAILED; |
| } |
| } |
| |
| ctx->cipher_info = cipher_info; |
| |
| return 0; |
| } |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| int mbedtls_cipher_setup_psa(mbedtls_cipher_context_t *ctx, |
| const mbedtls_cipher_info_t *cipher_info, |
| size_t taglen) |
| { |
| psa_algorithm_t alg; |
| mbedtls_cipher_context_psa *cipher_psa; |
| |
| if (NULL == cipher_info || NULL == ctx) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| /* Check that the underlying cipher mode and cipher type are |
| * supported by the underlying PSA Crypto implementation. */ |
| alg = mbedtls_psa_translate_cipher_mode(((mbedtls_cipher_mode_t) cipher_info->mode), taglen); |
| if (alg == 0) { |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| if (mbedtls_psa_translate_cipher_type(((mbedtls_cipher_type_t) cipher_info->type)) == 0) { |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| |
| memset(ctx, 0, sizeof(mbedtls_cipher_context_t)); |
| |
| cipher_psa = mbedtls_calloc(1, sizeof(mbedtls_cipher_context_psa)); |
| if (cipher_psa == NULL) { |
| return MBEDTLS_ERR_CIPHER_ALLOC_FAILED; |
| } |
| cipher_psa->alg = alg; |
| ctx->cipher_ctx = cipher_psa; |
| ctx->cipher_info = cipher_info; |
| ctx->psa_enabled = 1; |
| return 0; |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| int mbedtls_cipher_setkey(mbedtls_cipher_context_t *ctx, |
| const unsigned char *key, |
| int key_bitlen, |
| const mbedtls_operation_t operation) |
| { |
| if (operation != MBEDTLS_ENCRYPT && operation != MBEDTLS_DECRYPT) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| if (ctx->cipher_info == NULL) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| #if defined(MBEDTLS_BLOCK_CIPHER_NO_DECRYPT) |
| if (MBEDTLS_MODE_ECB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) && |
| MBEDTLS_DECRYPT == operation) { |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| #endif |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| if (ctx->psa_enabled == 1) { |
| mbedtls_cipher_context_psa * const cipher_psa = |
| (mbedtls_cipher_context_psa *) ctx->cipher_ctx; |
| |
| size_t const key_bytelen = ((size_t) key_bitlen + 7) / 8; |
| |
| psa_status_t status; |
| psa_key_type_t key_type; |
| psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT; |
| |
| /* PSA Crypto API only accepts byte-aligned keys. */ |
| if (key_bitlen % 8 != 0) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| /* Don't allow keys to be set multiple times. */ |
| if (cipher_psa->slot_state != MBEDTLS_CIPHER_PSA_KEY_UNSET) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| key_type = mbedtls_psa_translate_cipher_type( |
| ((mbedtls_cipher_type_t) ctx->cipher_info->type)); |
| if (key_type == 0) { |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| psa_set_key_type(&attributes, key_type); |
| |
| /* Mbed TLS' cipher layer doesn't enforce the mode of operation |
| * (encrypt vs. decrypt): it is possible to setup a key for encryption |
| * and use it for AEAD decryption. Until tests relying on this |
| * are changed, allow any usage in PSA. */ |
| psa_set_key_usage_flags(&attributes, |
| PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT); |
| psa_set_key_algorithm(&attributes, cipher_psa->alg); |
| |
| status = psa_import_key(&attributes, key, key_bytelen, |
| &cipher_psa->slot); |
| switch (status) { |
| case PSA_SUCCESS: |
| break; |
| case PSA_ERROR_INSUFFICIENT_MEMORY: |
| return MBEDTLS_ERR_CIPHER_ALLOC_FAILED; |
| case PSA_ERROR_NOT_SUPPORTED: |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| default: |
| return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; |
| } |
| /* Indicate that we own the key slot and need to |
| * destroy it in mbedtls_cipher_free(). */ |
| cipher_psa->slot_state = MBEDTLS_CIPHER_PSA_KEY_OWNED; |
| |
| ctx->key_bitlen = key_bitlen; |
| ctx->operation = operation; |
| return 0; |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| if ((ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_KEY_LEN) == 0 && |
| (int) mbedtls_cipher_info_get_key_bitlen(ctx->cipher_info) != key_bitlen) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| ctx->key_bitlen = key_bitlen; |
| ctx->operation = operation; |
| |
| #if !defined(MBEDTLS_BLOCK_CIPHER_NO_DECRYPT) |
| /* |
| * For OFB, CFB and CTR mode always use the encryption key schedule |
| */ |
| if (MBEDTLS_ENCRYPT == operation || |
| MBEDTLS_MODE_CFB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || |
| MBEDTLS_MODE_OFB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || |
| MBEDTLS_MODE_CTR == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { |
| return mbedtls_cipher_get_base(ctx->cipher_info)->setkey_enc_func(ctx->cipher_ctx, key, |
| ctx->key_bitlen); |
| } |
| |
| if (MBEDTLS_DECRYPT == operation) { |
| return mbedtls_cipher_get_base(ctx->cipher_info)->setkey_dec_func(ctx->cipher_ctx, key, |
| ctx->key_bitlen); |
| } |
| #else |
| if (operation == MBEDTLS_ENCRYPT || operation == MBEDTLS_DECRYPT) { |
| return mbedtls_cipher_get_base(ctx->cipher_info)->setkey_enc_func(ctx->cipher_ctx, key, |
| ctx->key_bitlen); |
| } |
| #endif |
| |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| int mbedtls_cipher_set_iv(mbedtls_cipher_context_t *ctx, |
| const unsigned char *iv, |
| size_t iv_len) |
| { |
| size_t actual_iv_size; |
| |
| if (ctx->cipher_info == NULL) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| if (ctx->psa_enabled == 1) { |
| /* While PSA Crypto has an API for multipart |
| * operations, we currently don't make it |
| * accessible through the cipher layer. */ |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| /* avoid buffer overflow in ctx->iv */ |
| if (iv_len > MBEDTLS_MAX_IV_LENGTH) { |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| |
| if ((ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_IV_LEN) != 0) { |
| actual_iv_size = iv_len; |
| } else { |
| actual_iv_size = mbedtls_cipher_info_get_iv_size(ctx->cipher_info); |
| |
| /* avoid reading past the end of input buffer */ |
| if (actual_iv_size > iv_len) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| } |
| |
| #if defined(MBEDTLS_CHACHA20_C) |
| if (((mbedtls_cipher_type_t) ctx->cipher_info->type) == MBEDTLS_CIPHER_CHACHA20) { |
| /* Even though the actual_iv_size is overwritten with a correct value |
| * of 12 from the cipher info, return an error to indicate that |
| * the input iv_len is wrong. */ |
| if (iv_len != 12) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| if (0 != mbedtls_chacha20_starts((mbedtls_chacha20_context *) ctx->cipher_ctx, |
| iv, |
| 0U)) { /* Initial counter value */ |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| } |
| #if defined(MBEDTLS_CHACHAPOLY_C) |
| if (((mbedtls_cipher_type_t) ctx->cipher_info->type) == MBEDTLS_CIPHER_CHACHA20_POLY1305 && |
| iv_len != 12) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| #endif |
| #endif |
| |
| #if defined(MBEDTLS_GCM_C) |
| if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { |
| return mbedtls_gcm_starts((mbedtls_gcm_context *) ctx->cipher_ctx, |
| ctx->operation, |
| iv, iv_len); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_CCM_C) |
| if (MBEDTLS_MODE_CCM_STAR_NO_TAG == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { |
| int set_lengths_result; |
| int ccm_star_mode; |
| |
| set_lengths_result = mbedtls_ccm_set_lengths( |
| (mbedtls_ccm_context *) ctx->cipher_ctx, |
| 0, 0, 0); |
| if (set_lengths_result != 0) { |
| return set_lengths_result; |
| } |
| |
| if (ctx->operation == MBEDTLS_DECRYPT) { |
| ccm_star_mode = MBEDTLS_CCM_STAR_DECRYPT; |
| } else if (ctx->operation == MBEDTLS_ENCRYPT) { |
| ccm_star_mode = MBEDTLS_CCM_STAR_ENCRYPT; |
| } else { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| return mbedtls_ccm_starts((mbedtls_ccm_context *) ctx->cipher_ctx, |
| ccm_star_mode, |
| iv, iv_len); |
| } |
| #endif |
| |
| if (actual_iv_size != 0) { |
| memcpy(ctx->iv, iv, actual_iv_size); |
| ctx->iv_size = actual_iv_size; |
| } |
| |
| return 0; |
| } |
| |
| int mbedtls_cipher_reset(mbedtls_cipher_context_t *ctx) |
| { |
| if (ctx->cipher_info == NULL) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| if (ctx->psa_enabled == 1) { |
| /* We don't support resetting PSA-based |
| * cipher contexts, yet. */ |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| ctx->unprocessed_len = 0; |
| |
| return 0; |
| } |
| |
| #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C) |
| int mbedtls_cipher_update_ad(mbedtls_cipher_context_t *ctx, |
| const unsigned char *ad, size_t ad_len) |
| { |
| if (ctx->cipher_info == NULL) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| if (ctx->psa_enabled == 1) { |
| /* While PSA Crypto has an API for multipart |
| * operations, we currently don't make it |
| * accessible through the cipher layer. */ |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| #if defined(MBEDTLS_GCM_C) |
| if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { |
| return mbedtls_gcm_update_ad((mbedtls_gcm_context *) ctx->cipher_ctx, |
| ad, ad_len); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_CHACHAPOLY_C) |
| if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) { |
| int result; |
| mbedtls_chachapoly_mode_t mode; |
| |
| mode = (ctx->operation == MBEDTLS_ENCRYPT) |
| ? MBEDTLS_CHACHAPOLY_ENCRYPT |
| : MBEDTLS_CHACHAPOLY_DECRYPT; |
| |
| result = mbedtls_chachapoly_starts((mbedtls_chachapoly_context *) ctx->cipher_ctx, |
| ctx->iv, |
| mode); |
| if (result != 0) { |
| return result; |
| } |
| |
| return mbedtls_chachapoly_update_aad((mbedtls_chachapoly_context *) ctx->cipher_ctx, |
| ad, ad_len); |
| } |
| #endif |
| |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| #endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */ |
| |
| int mbedtls_cipher_update(mbedtls_cipher_context_t *ctx, const unsigned char *input, |
| size_t ilen, unsigned char *output, size_t *olen) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| size_t block_size; |
| |
| if (ctx->cipher_info == NULL) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| if (ctx->psa_enabled == 1) { |
| /* While PSA Crypto has an API for multipart |
| * operations, we currently don't make it |
| * accessible through the cipher layer. */ |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| *olen = 0; |
| block_size = mbedtls_cipher_get_block_size(ctx); |
| if (0 == block_size) { |
| return MBEDTLS_ERR_CIPHER_INVALID_CONTEXT; |
| } |
| |
| if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_ECB) { |
| if (ilen != block_size) { |
| return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED; |
| } |
| |
| *olen = ilen; |
| |
| if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->ecb_func(ctx->cipher_ctx, |
| ctx->operation, input, |
| output))) { |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| #if defined(MBEDTLS_GCM_C) |
| if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_GCM) { |
| return mbedtls_gcm_update((mbedtls_gcm_context *) ctx->cipher_ctx, |
| input, ilen, |
| output, ilen, olen); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_CCM_C) |
| if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_CCM_STAR_NO_TAG) { |
| return mbedtls_ccm_update((mbedtls_ccm_context *) ctx->cipher_ctx, |
| input, ilen, |
| output, ilen, olen); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_CHACHAPOLY_C) |
| if (((mbedtls_cipher_type_t) ctx->cipher_info->type) == MBEDTLS_CIPHER_CHACHA20_POLY1305) { |
| *olen = ilen; |
| return mbedtls_chachapoly_update((mbedtls_chachapoly_context *) ctx->cipher_ctx, |
| ilen, input, output); |
| } |
| #endif |
| |
| if (input == output && |
| (ctx->unprocessed_len != 0 || ilen % block_size)) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| #if defined(MBEDTLS_CIPHER_MODE_CBC) |
| if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_CBC) { |
| size_t copy_len = 0; |
| |
| /* |
| * If there is not enough data for a full block, cache it. |
| */ |
| if ((ctx->operation == MBEDTLS_DECRYPT && NULL != ctx->add_padding && |
| ilen <= block_size - ctx->unprocessed_len) || |
| (ctx->operation == MBEDTLS_DECRYPT && NULL == ctx->add_padding && |
| ilen < block_size - ctx->unprocessed_len) || |
| (ctx->operation == MBEDTLS_ENCRYPT && |
| ilen < block_size - ctx->unprocessed_len)) { |
| memcpy(&(ctx->unprocessed_data[ctx->unprocessed_len]), input, |
| ilen); |
| |
| ctx->unprocessed_len += ilen; |
| return 0; |
| } |
| |
| /* |
| * Process cached data first |
| */ |
| if (0 != ctx->unprocessed_len) { |
| copy_len = block_size - ctx->unprocessed_len; |
| |
| memcpy(&(ctx->unprocessed_data[ctx->unprocessed_len]), input, |
| copy_len); |
| |
| if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->cbc_func(ctx->cipher_ctx, |
| ctx->operation, |
| block_size, ctx->iv, |
| ctx-> |
| unprocessed_data, |
| output))) { |
| return ret; |
| } |
| |
| *olen += block_size; |
| output += block_size; |
| ctx->unprocessed_len = 0; |
| |
| input += copy_len; |
| ilen -= copy_len; |
| } |
| |
| /* |
| * Cache final, incomplete block |
| */ |
| if (0 != ilen) { |
| /* Encryption: only cache partial blocks |
| * Decryption w/ padding: always keep at least one whole block |
| * Decryption w/o padding: only cache partial blocks |
| */ |
| copy_len = ilen % block_size; |
| if (copy_len == 0 && |
| ctx->operation == MBEDTLS_DECRYPT && |
| NULL != ctx->add_padding) { |
| copy_len = block_size; |
| } |
| |
| memcpy(ctx->unprocessed_data, &(input[ilen - copy_len]), |
| copy_len); |
| |
| ctx->unprocessed_len += copy_len; |
| ilen -= copy_len; |
| } |
| |
| /* |
| * Process remaining full blocks |
| */ |
| if (ilen) { |
| if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->cbc_func(ctx->cipher_ctx, |
| ctx->operation, |
| ilen, ctx->iv, |
| input, |
| output))) { |
| return ret; |
| } |
| |
| *olen += ilen; |
| } |
| |
| return 0; |
| } |
| #endif /* MBEDTLS_CIPHER_MODE_CBC */ |
| |
| #if defined(MBEDTLS_CIPHER_MODE_CFB) |
| if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_CFB) { |
| if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->cfb_func(ctx->cipher_ctx, |
| ctx->operation, ilen, |
| &ctx->unprocessed_len, |
| ctx->iv, |
| input, output))) { |
| return ret; |
| } |
| |
| *olen = ilen; |
| |
| return 0; |
| } |
| #endif /* MBEDTLS_CIPHER_MODE_CFB */ |
| |
| #if defined(MBEDTLS_CIPHER_MODE_OFB) |
| if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_OFB) { |
| if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->ofb_func(ctx->cipher_ctx, |
| ilen, |
| &ctx->unprocessed_len, |
| ctx->iv, |
| input, output))) { |
| return ret; |
| } |
| |
| *olen = ilen; |
| |
| return 0; |
| } |
| #endif /* MBEDTLS_CIPHER_MODE_OFB */ |
| |
| #if defined(MBEDTLS_CIPHER_MODE_CTR) |
| if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_CTR) { |
| if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->ctr_func(ctx->cipher_ctx, |
| ilen, |
| &ctx->unprocessed_len, |
| ctx->iv, |
| ctx->unprocessed_data, |
| input, output))) { |
| return ret; |
| } |
| |
| *olen = ilen; |
| |
| return 0; |
| } |
| #endif /* MBEDTLS_CIPHER_MODE_CTR */ |
| |
| #if defined(MBEDTLS_CIPHER_MODE_XTS) |
| if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_XTS) { |
| if (ctx->unprocessed_len > 0) { |
| /* We can only process an entire data unit at a time. */ |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| |
| ret = mbedtls_cipher_get_base(ctx->cipher_info)->xts_func(ctx->cipher_ctx, |
| ctx->operation, |
| ilen, |
| ctx->iv, |
| input, |
| output); |
| if (ret != 0) { |
| return ret; |
| } |
| |
| *olen = ilen; |
| |
| return 0; |
| } |
| #endif /* MBEDTLS_CIPHER_MODE_XTS */ |
| |
| #if defined(MBEDTLS_CIPHER_MODE_STREAM) |
| if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) == MBEDTLS_MODE_STREAM) { |
| if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->stream_func(ctx->cipher_ctx, |
| ilen, input, |
| output))) { |
| return ret; |
| } |
| |
| *olen = ilen; |
| |
| return 0; |
| } |
| #endif /* MBEDTLS_CIPHER_MODE_STREAM */ |
| |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| |
| #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING) |
| #if defined(MBEDTLS_CIPHER_PADDING_PKCS7) |
| /* |
| * PKCS7 (and PKCS5) padding: fill with ll bytes, with ll = padding_len |
| */ |
| static void add_pkcs_padding(unsigned char *output, size_t output_len, |
| size_t data_len) |
| { |
| size_t padding_len = output_len - data_len; |
| unsigned char i; |
| |
| for (i = 0; i < padding_len; i++) { |
| output[data_len + i] = (unsigned char) padding_len; |
| } |
| } |
| |
| /* |
| * Get the length of the PKCS7 padding. |
| * |
| * Note: input_len must be the block size of the cipher. |
| */ |
| MBEDTLS_STATIC_TESTABLE int mbedtls_get_pkcs_padding(unsigned char *input, |
| size_t input_len, |
| size_t *data_len) |
| { |
| size_t i, pad_idx; |
| unsigned char padding_len; |
| |
| if (NULL == input || NULL == data_len) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| padding_len = input[input_len - 1]; |
| |
| mbedtls_ct_condition_t bad = mbedtls_ct_uint_gt(padding_len, input_len); |
| bad = mbedtls_ct_bool_or(bad, mbedtls_ct_uint_eq(padding_len, 0)); |
| |
| /* The number of bytes checked must be independent of padding_len, |
| * so pick input_len, which is usually 8 or 16 (one block) */ |
| pad_idx = input_len - padding_len; |
| for (i = 0; i < input_len; i++) { |
| mbedtls_ct_condition_t in_padding = mbedtls_ct_uint_ge(i, pad_idx); |
| mbedtls_ct_condition_t different = mbedtls_ct_uint_ne(input[i], padding_len); |
| bad = mbedtls_ct_bool_or(bad, mbedtls_ct_bool_and(in_padding, different)); |
| } |
| |
| /* If the padding is invalid, set the output length to 0 */ |
| *data_len = mbedtls_ct_if(bad, 0, input_len - padding_len); |
| |
| return mbedtls_ct_error_if_else_0(bad, MBEDTLS_ERR_CIPHER_INVALID_PADDING); |
| } |
| #endif /* MBEDTLS_CIPHER_PADDING_PKCS7 */ |
| |
| #if defined(MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS) |
| /* |
| * One and zeros padding: fill with 80 00 ... 00 |
| */ |
| static void add_one_and_zeros_padding(unsigned char *output, |
| size_t output_len, size_t data_len) |
| { |
| size_t padding_len = output_len - data_len; |
| unsigned char i = 0; |
| |
| output[data_len] = 0x80; |
| for (i = 1; i < padding_len; i++) { |
| output[data_len + i] = 0x00; |
| } |
| } |
| |
| static int get_one_and_zeros_padding(unsigned char *input, size_t input_len, |
| size_t *data_len) |
| { |
| if (NULL == input || NULL == data_len) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| mbedtls_ct_condition_t in_padding = MBEDTLS_CT_TRUE; |
| mbedtls_ct_condition_t bad = MBEDTLS_CT_TRUE; |
| |
| *data_len = 0; |
| |
| for (ptrdiff_t i = (ptrdiff_t) (input_len) - 1; i >= 0; i--) { |
| mbedtls_ct_condition_t is_nonzero = mbedtls_ct_bool(input[i]); |
| |
| mbedtls_ct_condition_t hit_first_nonzero = mbedtls_ct_bool_and(is_nonzero, in_padding); |
| |
| *data_len = mbedtls_ct_size_if(hit_first_nonzero, i, *data_len); |
| |
| bad = mbedtls_ct_bool_if(hit_first_nonzero, mbedtls_ct_uint_ne(input[i], 0x80), bad); |
| |
| in_padding = mbedtls_ct_bool_and(in_padding, mbedtls_ct_bool_not(is_nonzero)); |
| } |
| |
| return mbedtls_ct_error_if_else_0(bad, MBEDTLS_ERR_CIPHER_INVALID_PADDING); |
| } |
| #endif /* MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS */ |
| |
| #if defined(MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN) |
| /* |
| * Zeros and len padding: fill with 00 ... 00 ll, where ll is padding length |
| */ |
| static void add_zeros_and_len_padding(unsigned char *output, |
| size_t output_len, size_t data_len) |
| { |
| size_t padding_len = output_len - data_len; |
| unsigned char i = 0; |
| |
| for (i = 1; i < padding_len; i++) { |
| output[data_len + i - 1] = 0x00; |
| } |
| output[output_len - 1] = (unsigned char) padding_len; |
| } |
| |
| static int get_zeros_and_len_padding(unsigned char *input, size_t input_len, |
| size_t *data_len) |
| { |
| size_t i, pad_idx; |
| unsigned char padding_len; |
| mbedtls_ct_condition_t bad; |
| |
| if (NULL == input || NULL == data_len) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| padding_len = input[input_len - 1]; |
| *data_len = input_len - padding_len; |
| |
| /* Avoid logical || since it results in a branch */ |
| bad = mbedtls_ct_uint_gt(padding_len, input_len); |
| bad = mbedtls_ct_bool_or(bad, mbedtls_ct_uint_eq(padding_len, 0)); |
| |
| /* The number of bytes checked must be independent of padding_len */ |
| pad_idx = input_len - padding_len; |
| for (i = 0; i < input_len - 1; i++) { |
| mbedtls_ct_condition_t is_padding = mbedtls_ct_uint_ge(i, pad_idx); |
| mbedtls_ct_condition_t nonzero_pad_byte; |
| nonzero_pad_byte = mbedtls_ct_bool_if_else_0(is_padding, mbedtls_ct_bool(input[i])); |
| bad = mbedtls_ct_bool_or(bad, nonzero_pad_byte); |
| } |
| |
| return mbedtls_ct_error_if_else_0(bad, MBEDTLS_ERR_CIPHER_INVALID_PADDING); |
| } |
| #endif /* MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN */ |
| |
| #if defined(MBEDTLS_CIPHER_PADDING_ZEROS) |
| /* |
| * Zero padding: fill with 00 ... 00 |
| */ |
| static void add_zeros_padding(unsigned char *output, |
| size_t output_len, size_t data_len) |
| { |
| memset(output + data_len, 0, output_len - data_len); |
| } |
| |
| static int get_zeros_padding(unsigned char *input, size_t input_len, |
| size_t *data_len) |
| { |
| size_t i; |
| mbedtls_ct_condition_t done = MBEDTLS_CT_FALSE, prev_done; |
| |
| if (NULL == input || NULL == data_len) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| *data_len = 0; |
| for (i = input_len; i > 0; i--) { |
| prev_done = done; |
| done = mbedtls_ct_bool_or(done, mbedtls_ct_uint_ne(input[i-1], 0)); |
| *data_len = mbedtls_ct_size_if(mbedtls_ct_bool_ne(done, prev_done), i, *data_len); |
| } |
| |
| return 0; |
| } |
| #endif /* MBEDTLS_CIPHER_PADDING_ZEROS */ |
| |
| /* |
| * No padding: don't pad :) |
| * |
| * There is no add_padding function (check for NULL in mbedtls_cipher_finish) |
| * but a trivial get_padding function |
| */ |
| static int get_no_padding(unsigned char *input, size_t input_len, |
| size_t *data_len) |
| { |
| if (NULL == input || NULL == data_len) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| *data_len = input_len; |
| |
| return 0; |
| } |
| #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */ |
| |
| int mbedtls_cipher_finish(mbedtls_cipher_context_t *ctx, |
| unsigned char *output, size_t *olen) |
| { |
| if (ctx->cipher_info == NULL) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| if (ctx->psa_enabled == 1) { |
| /* While PSA Crypto has an API for multipart |
| * operations, we currently don't make it |
| * accessible through the cipher layer. */ |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| *olen = 0; |
| |
| #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING) |
| /* CBC mode requires padding so we make sure a call to |
| * mbedtls_cipher_set_padding_mode has been done successfully. */ |
| if (MBEDTLS_MODE_CBC == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { |
| if (ctx->get_padding == NULL) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| } |
| #endif |
| |
| if (MBEDTLS_MODE_CFB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || |
| MBEDTLS_MODE_OFB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || |
| MBEDTLS_MODE_CTR == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || |
| MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || |
| MBEDTLS_MODE_CCM_STAR_NO_TAG == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || |
| MBEDTLS_MODE_XTS == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || |
| MBEDTLS_MODE_STREAM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { |
| return 0; |
| } |
| |
| if ((MBEDTLS_CIPHER_CHACHA20 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) || |
| (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type))) { |
| return 0; |
| } |
| |
| if (MBEDTLS_MODE_ECB == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { |
| if (ctx->unprocessed_len != 0) { |
| return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED; |
| } |
| |
| return 0; |
| } |
| |
| #if defined(MBEDTLS_CIPHER_MODE_CBC) |
| if (MBEDTLS_MODE_CBC == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { |
| int ret = 0; |
| |
| if (MBEDTLS_ENCRYPT == ctx->operation) { |
| /* check for 'no padding' mode */ |
| if (NULL == ctx->add_padding) { |
| if (0 != ctx->unprocessed_len) { |
| return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED; |
| } |
| |
| return 0; |
| } |
| |
| ctx->add_padding(ctx->unprocessed_data, mbedtls_cipher_get_iv_size(ctx), |
| ctx->unprocessed_len); |
| } else if (mbedtls_cipher_get_block_size(ctx) != ctx->unprocessed_len) { |
| /* |
| * For decrypt operations, expect a full block, |
| * or an empty block if no padding |
| */ |
| if (NULL == ctx->add_padding && 0 == ctx->unprocessed_len) { |
| return 0; |
| } |
| |
| return MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED; |
| } |
| |
| /* cipher block */ |
| if (0 != (ret = mbedtls_cipher_get_base(ctx->cipher_info)->cbc_func(ctx->cipher_ctx, |
| ctx->operation, |
| mbedtls_cipher_get_block_size( |
| ctx), |
| ctx->iv, |
| ctx->unprocessed_data, |
| output))) { |
| return ret; |
| } |
| |
| /* Set output size for decryption */ |
| if (MBEDTLS_DECRYPT == ctx->operation) { |
| return ctx->get_padding(output, mbedtls_cipher_get_block_size(ctx), |
| olen); |
| } |
| |
| /* Set output size for encryption */ |
| *olen = mbedtls_cipher_get_block_size(ctx); |
| return 0; |
| } |
| #else |
| ((void) output); |
| #endif /* MBEDTLS_CIPHER_MODE_CBC */ |
| |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| |
| #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING) |
| int mbedtls_cipher_set_padding_mode(mbedtls_cipher_context_t *ctx, |
| mbedtls_cipher_padding_t mode) |
| { |
| if (NULL == ctx->cipher_info || |
| MBEDTLS_MODE_CBC != ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| if (ctx->psa_enabled == 1) { |
| /* While PSA Crypto knows about CBC padding |
| * schemes, we currently don't make them |
| * accessible through the cipher layer. */ |
| if (mode != MBEDTLS_PADDING_NONE) { |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| |
| return 0; |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| switch (mode) { |
| #if defined(MBEDTLS_CIPHER_PADDING_PKCS7) |
| case MBEDTLS_PADDING_PKCS7: |
| ctx->add_padding = add_pkcs_padding; |
| ctx->get_padding = mbedtls_get_pkcs_padding; |
| break; |
| #endif |
| #if defined(MBEDTLS_CIPHER_PADDING_ONE_AND_ZEROS) |
| case MBEDTLS_PADDING_ONE_AND_ZEROS: |
| ctx->add_padding = add_one_and_zeros_padding; |
| ctx->get_padding = get_one_and_zeros_padding; |
| break; |
| #endif |
| #if defined(MBEDTLS_CIPHER_PADDING_ZEROS_AND_LEN) |
| case MBEDTLS_PADDING_ZEROS_AND_LEN: |
| ctx->add_padding = add_zeros_and_len_padding; |
| ctx->get_padding = get_zeros_and_len_padding; |
| break; |
| #endif |
| #if defined(MBEDTLS_CIPHER_PADDING_ZEROS) |
| case MBEDTLS_PADDING_ZEROS: |
| ctx->add_padding = add_zeros_padding; |
| ctx->get_padding = get_zeros_padding; |
| break; |
| #endif |
| case MBEDTLS_PADDING_NONE: |
| ctx->add_padding = NULL; |
| ctx->get_padding = get_no_padding; |
| break; |
| |
| default: |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| |
| return 0; |
| } |
| #endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */ |
| |
| #if defined(MBEDTLS_GCM_C) || defined(MBEDTLS_CHACHAPOLY_C) |
| int mbedtls_cipher_write_tag(mbedtls_cipher_context_t *ctx, |
| unsigned char *tag, size_t tag_len) |
| { |
| if (ctx->cipher_info == NULL) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| if (MBEDTLS_ENCRYPT != ctx->operation) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| if (ctx->psa_enabled == 1) { |
| /* While PSA Crypto has an API for multipart |
| * operations, we currently don't make it |
| * accessible through the cipher layer. */ |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| #if defined(MBEDTLS_GCM_C) |
| if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { |
| size_t output_length; |
| /* The code here doesn't yet support alternative implementations |
| * that can delay up to a block of output. */ |
| return mbedtls_gcm_finish((mbedtls_gcm_context *) ctx->cipher_ctx, |
| NULL, 0, &output_length, |
| tag, tag_len); |
| } |
| #endif |
| |
| #if defined(MBEDTLS_CHACHAPOLY_C) |
| if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) { |
| /* Don't allow truncated MAC for Poly1305 */ |
| if (tag_len != 16U) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| return mbedtls_chachapoly_finish( |
| (mbedtls_chachapoly_context *) ctx->cipher_ctx, tag); |
| } |
| #endif |
| |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| |
| int mbedtls_cipher_check_tag(mbedtls_cipher_context_t *ctx, |
| const unsigned char *tag, size_t tag_len) |
| { |
| unsigned char check_tag[16]; |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| |
| if (ctx->cipher_info == NULL) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| if (MBEDTLS_DECRYPT != ctx->operation) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| if (ctx->psa_enabled == 1) { |
| /* While PSA Crypto has an API for multipart |
| * operations, we currently don't make it |
| * accessible through the cipher layer. */ |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| /* Status to return on a non-authenticated algorithm. */ |
| ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| |
| #if defined(MBEDTLS_GCM_C) |
| if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { |
| size_t output_length; |
| /* The code here doesn't yet support alternative implementations |
| * that can delay up to a block of output. */ |
| |
| if (tag_len > sizeof(check_tag)) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| if (0 != (ret = mbedtls_gcm_finish( |
| (mbedtls_gcm_context *) ctx->cipher_ctx, |
| NULL, 0, &output_length, |
| check_tag, tag_len))) { |
| return ret; |
| } |
| |
| /* Check the tag in "constant-time" */ |
| if (mbedtls_ct_memcmp(tag, check_tag, tag_len) != 0) { |
| ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED; |
| goto exit; |
| } |
| } |
| #endif /* MBEDTLS_GCM_C */ |
| |
| #if defined(MBEDTLS_CHACHAPOLY_C) |
| if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) { |
| /* Don't allow truncated MAC for Poly1305 */ |
| if (tag_len != sizeof(check_tag)) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| ret = mbedtls_chachapoly_finish( |
| (mbedtls_chachapoly_context *) ctx->cipher_ctx, check_tag); |
| if (ret != 0) { |
| return ret; |
| } |
| |
| /* Check the tag in "constant-time" */ |
| if (mbedtls_ct_memcmp(tag, check_tag, tag_len) != 0) { |
| ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED; |
| goto exit; |
| } |
| } |
| #endif /* MBEDTLS_CHACHAPOLY_C */ |
| |
| exit: |
| mbedtls_platform_zeroize(check_tag, tag_len); |
| return ret; |
| } |
| #endif /* MBEDTLS_GCM_C || MBEDTLS_CHACHAPOLY_C */ |
| |
| /* |
| * Packet-oriented wrapper for non-AEAD modes |
| */ |
| int mbedtls_cipher_crypt(mbedtls_cipher_context_t *ctx, |
| const unsigned char *iv, size_t iv_len, |
| const unsigned char *input, size_t ilen, |
| unsigned char *output, size_t *olen) |
| { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| size_t finish_olen; |
| |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| if (ctx->psa_enabled == 1) { |
| /* As in the non-PSA case, we don't check that |
| * a key has been set. If not, the key slot will |
| * still be in its default state of 0, which is |
| * guaranteed to be invalid, hence the PSA-call |
| * below will gracefully fail. */ |
| mbedtls_cipher_context_psa * const cipher_psa = |
| (mbedtls_cipher_context_psa *) ctx->cipher_ctx; |
| |
| psa_status_t status; |
| psa_cipher_operation_t cipher_op = PSA_CIPHER_OPERATION_INIT; |
| size_t part_len; |
| |
| if (ctx->operation == MBEDTLS_DECRYPT) { |
| status = psa_cipher_decrypt_setup(&cipher_op, |
| cipher_psa->slot, |
| cipher_psa->alg); |
| } else if (ctx->operation == MBEDTLS_ENCRYPT) { |
| status = psa_cipher_encrypt_setup(&cipher_op, |
| cipher_psa->slot, |
| cipher_psa->alg); |
| } else { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| /* In the following, we can immediately return on an error, |
| * because the PSA Crypto API guarantees that cipher operations |
| * are terminated by unsuccessful calls to psa_cipher_update(), |
| * and by any call to psa_cipher_finish(). */ |
| if (status != PSA_SUCCESS) { |
| return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; |
| } |
| |
| if (((mbedtls_cipher_mode_t) ctx->cipher_info->mode) != MBEDTLS_MODE_ECB) { |
| status = psa_cipher_set_iv(&cipher_op, iv, iv_len); |
| if (status != PSA_SUCCESS) { |
| return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; |
| } |
| } |
| |
| status = psa_cipher_update(&cipher_op, |
| input, ilen, |
| output, ilen, olen); |
| if (status != PSA_SUCCESS) { |
| return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; |
| } |
| |
| status = psa_cipher_finish(&cipher_op, |
| output + *olen, ilen - *olen, |
| &part_len); |
| if (status != PSA_SUCCESS) { |
| return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; |
| } |
| |
| *olen += part_len; |
| return 0; |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| if ((ret = mbedtls_cipher_set_iv(ctx, iv, iv_len)) != 0) { |
| return ret; |
| } |
| |
| if ((ret = mbedtls_cipher_reset(ctx)) != 0) { |
| return ret; |
| } |
| |
| if ((ret = mbedtls_cipher_update(ctx, input, ilen, |
| output, olen)) != 0) { |
| return ret; |
| } |
| |
| if ((ret = mbedtls_cipher_finish(ctx, output + *olen, |
| &finish_olen)) != 0) { |
| return ret; |
| } |
| |
| *olen += finish_olen; |
| |
| return 0; |
| } |
| |
| #if defined(MBEDTLS_CIPHER_MODE_AEAD) |
| /* |
| * Packet-oriented encryption for AEAD modes: internal function used by |
| * mbedtls_cipher_auth_encrypt_ext(). |
| */ |
| static int mbedtls_cipher_aead_encrypt(mbedtls_cipher_context_t *ctx, |
| const unsigned char *iv, size_t iv_len, |
| const unsigned char *ad, size_t ad_len, |
| const unsigned char *input, size_t ilen, |
| unsigned char *output, size_t *olen, |
| unsigned char *tag, size_t tag_len) |
| { |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| if (ctx->psa_enabled == 1) { |
| /* As in the non-PSA case, we don't check that |
| * a key has been set. If not, the key slot will |
| * still be in its default state of 0, which is |
| * guaranteed to be invalid, hence the PSA-call |
| * below will gracefully fail. */ |
| mbedtls_cipher_context_psa * const cipher_psa = |
| (mbedtls_cipher_context_psa *) ctx->cipher_ctx; |
| |
| psa_status_t status; |
| |
| /* PSA Crypto API always writes the authentication tag |
| * at the end of the encrypted message. */ |
| if (output == NULL || tag != output + ilen) { |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| |
| status = psa_aead_encrypt(cipher_psa->slot, |
| cipher_psa->alg, |
| iv, iv_len, |
| ad, ad_len, |
| input, ilen, |
| output, ilen + tag_len, olen); |
| if (status != PSA_SUCCESS) { |
| return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; |
| } |
| |
| *olen -= tag_len; |
| return 0; |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| #if defined(MBEDTLS_GCM_C) |
| if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { |
| *olen = ilen; |
| return mbedtls_gcm_crypt_and_tag(ctx->cipher_ctx, MBEDTLS_GCM_ENCRYPT, |
| ilen, iv, iv_len, ad, ad_len, |
| input, output, tag_len, tag); |
| } |
| #endif /* MBEDTLS_GCM_C */ |
| #if defined(MBEDTLS_CCM_C) |
| if (MBEDTLS_MODE_CCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { |
| *olen = ilen; |
| return mbedtls_ccm_encrypt_and_tag(ctx->cipher_ctx, ilen, |
| iv, iv_len, ad, ad_len, input, output, |
| tag, tag_len); |
| } |
| #endif /* MBEDTLS_CCM_C */ |
| #if defined(MBEDTLS_CHACHAPOLY_C) |
| if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) { |
| /* ChachaPoly has fixed length nonce and MAC (tag) */ |
| if ((iv_len != mbedtls_cipher_info_get_iv_size(ctx->cipher_info)) || |
| (tag_len != 16U)) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| *olen = ilen; |
| return mbedtls_chachapoly_encrypt_and_tag(ctx->cipher_ctx, |
| ilen, iv, ad, ad_len, input, output, tag); |
| } |
| #endif /* MBEDTLS_CHACHAPOLY_C */ |
| |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| |
| /* |
| * Packet-oriented encryption for AEAD modes: internal function used by |
| * mbedtls_cipher_auth_encrypt_ext(). |
| */ |
| static int mbedtls_cipher_aead_decrypt(mbedtls_cipher_context_t *ctx, |
| const unsigned char *iv, size_t iv_len, |
| const unsigned char *ad, size_t ad_len, |
| const unsigned char *input, size_t ilen, |
| unsigned char *output, size_t *olen, |
| const unsigned char *tag, size_t tag_len) |
| { |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| if (ctx->psa_enabled == 1) { |
| /* As in the non-PSA case, we don't check that |
| * a key has been set. If not, the key slot will |
| * still be in its default state of 0, which is |
| * guaranteed to be invalid, hence the PSA-call |
| * below will gracefully fail. */ |
| mbedtls_cipher_context_psa * const cipher_psa = |
| (mbedtls_cipher_context_psa *) ctx->cipher_ctx; |
| |
| psa_status_t status; |
| |
| /* PSA Crypto API always writes the authentication tag |
| * at the end of the encrypted message. */ |
| if (input == NULL || tag != input + ilen) { |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| |
| status = psa_aead_decrypt(cipher_psa->slot, |
| cipher_psa->alg, |
| iv, iv_len, |
| ad, ad_len, |
| input, ilen + tag_len, |
| output, ilen, olen); |
| if (status == PSA_ERROR_INVALID_SIGNATURE) { |
| return MBEDTLS_ERR_CIPHER_AUTH_FAILED; |
| } else if (status != PSA_SUCCESS) { |
| return MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED; |
| } |
| |
| return 0; |
| } |
| #endif /* MBEDTLS_USE_PSA_CRYPTO && !MBEDTLS_DEPRECATED_REMOVED */ |
| |
| #if defined(MBEDTLS_GCM_C) |
| if (MBEDTLS_MODE_GCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| |
| *olen = ilen; |
| ret = mbedtls_gcm_auth_decrypt(ctx->cipher_ctx, ilen, |
| iv, iv_len, ad, ad_len, |
| tag, tag_len, input, output); |
| |
| if (ret == MBEDTLS_ERR_GCM_AUTH_FAILED) { |
| ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED; |
| } |
| |
| return ret; |
| } |
| #endif /* MBEDTLS_GCM_C */ |
| #if defined(MBEDTLS_CCM_C) |
| if (MBEDTLS_MODE_CCM == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| |
| *olen = ilen; |
| ret = mbedtls_ccm_auth_decrypt(ctx->cipher_ctx, ilen, |
| iv, iv_len, ad, ad_len, |
| input, output, tag, tag_len); |
| |
| if (ret == MBEDTLS_ERR_CCM_AUTH_FAILED) { |
| ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED; |
| } |
| |
| return ret; |
| } |
| #endif /* MBEDTLS_CCM_C */ |
| #if defined(MBEDTLS_CHACHAPOLY_C) |
| if (MBEDTLS_CIPHER_CHACHA20_POLY1305 == ((mbedtls_cipher_type_t) ctx->cipher_info->type)) { |
| int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; |
| |
| /* ChachaPoly has fixed length nonce and MAC (tag) */ |
| if ((iv_len != mbedtls_cipher_info_get_iv_size(ctx->cipher_info)) || |
| (tag_len != 16U)) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| *olen = ilen; |
| ret = mbedtls_chachapoly_auth_decrypt(ctx->cipher_ctx, ilen, |
| iv, ad, ad_len, tag, input, output); |
| |
| if (ret == MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED) { |
| ret = MBEDTLS_ERR_CIPHER_AUTH_FAILED; |
| } |
| |
| return ret; |
| } |
| #endif /* MBEDTLS_CHACHAPOLY_C */ |
| |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| } |
| #endif /* MBEDTLS_CIPHER_MODE_AEAD */ |
| |
| #if defined(MBEDTLS_CIPHER_MODE_AEAD) || defined(MBEDTLS_NIST_KW_C) |
| /* |
| * Packet-oriented encryption for AEAD/NIST_KW: public function. |
| */ |
| int mbedtls_cipher_auth_encrypt_ext(mbedtls_cipher_context_t *ctx, |
| const unsigned char *iv, size_t iv_len, |
| const unsigned char *ad, size_t ad_len, |
| const unsigned char *input, size_t ilen, |
| unsigned char *output, size_t output_len, |
| size_t *olen, size_t tag_len) |
| { |
| #if defined(MBEDTLS_NIST_KW_C) |
| if ( |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| ctx->psa_enabled == 0 && |
| #endif |
| (MBEDTLS_MODE_KW == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || |
| MBEDTLS_MODE_KWP == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode))) { |
| mbedtls_nist_kw_mode_t mode = |
| (MBEDTLS_MODE_KW == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) ? |
| MBEDTLS_KW_MODE_KW : MBEDTLS_KW_MODE_KWP; |
| |
| /* There is no iv, tag or ad associated with KW and KWP, |
| * so these length should be 0 as documented. */ |
| if (iv_len != 0 || tag_len != 0 || ad_len != 0) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| (void) iv; |
| (void) ad; |
| |
| return mbedtls_nist_kw_wrap(ctx->cipher_ctx, mode, input, ilen, |
| output, olen, output_len); |
| } |
| #endif /* MBEDTLS_NIST_KW_C */ |
| |
| #if defined(MBEDTLS_CIPHER_MODE_AEAD) |
| /* AEAD case: check length before passing on to shared function */ |
| if (output_len < ilen + tag_len) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| int ret = mbedtls_cipher_aead_encrypt(ctx, iv, iv_len, ad, ad_len, |
| input, ilen, output, olen, |
| output + ilen, tag_len); |
| *olen += tag_len; |
| return ret; |
| #else |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| #endif /* MBEDTLS_CIPHER_MODE_AEAD */ |
| } |
| |
| /* |
| * Packet-oriented decryption for AEAD/NIST_KW: public function. |
| */ |
| int mbedtls_cipher_auth_decrypt_ext(mbedtls_cipher_context_t *ctx, |
| const unsigned char *iv, size_t iv_len, |
| const unsigned char *ad, size_t ad_len, |
| const unsigned char *input, size_t ilen, |
| unsigned char *output, size_t output_len, |
| size_t *olen, size_t tag_len) |
| { |
| #if defined(MBEDTLS_NIST_KW_C) |
| if ( |
| #if defined(MBEDTLS_USE_PSA_CRYPTO) && !defined(MBEDTLS_DEPRECATED_REMOVED) |
| ctx->psa_enabled == 0 && |
| #endif |
| (MBEDTLS_MODE_KW == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode) || |
| MBEDTLS_MODE_KWP == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode))) { |
| mbedtls_nist_kw_mode_t mode = |
| (MBEDTLS_MODE_KW == ((mbedtls_cipher_mode_t) ctx->cipher_info->mode)) ? |
| MBEDTLS_KW_MODE_KW : MBEDTLS_KW_MODE_KWP; |
| |
| /* There is no iv, tag or ad associated with KW and KWP, |
| * so these length should be 0 as documented. */ |
| if (iv_len != 0 || tag_len != 0 || ad_len != 0) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| (void) iv; |
| (void) ad; |
| |
| return mbedtls_nist_kw_unwrap(ctx->cipher_ctx, mode, input, ilen, |
| output, olen, output_len); |
| } |
| #endif /* MBEDTLS_NIST_KW_C */ |
| |
| #if defined(MBEDTLS_CIPHER_MODE_AEAD) |
| /* AEAD case: check length before passing on to shared function */ |
| if (ilen < tag_len || output_len < ilen - tag_len) { |
| return MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA; |
| } |
| |
| return mbedtls_cipher_aead_decrypt(ctx, iv, iv_len, ad, ad_len, |
| input, ilen - tag_len, output, olen, |
| input + ilen - tag_len, tag_len); |
| #else |
| return MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; |
| #endif /* MBEDTLS_CIPHER_MODE_AEAD */ |
| } |
| #endif /* MBEDTLS_CIPHER_MODE_AEAD || MBEDTLS_NIST_KW_C */ |
| |
| #endif /* MBEDTLS_CIPHER_C */ |