diff options
Diffstat (limited to 'tf-psa-crypto/drivers/builtin/src/cipher.c')
| -rw-r--r-- | tf-psa-crypto/drivers/builtin/src/cipher.c | 1683 |
1 files changed, 1683 insertions, 0 deletions
diff --git a/tf-psa-crypto/drivers/builtin/src/cipher.c b/tf-psa-crypto/drivers/builtin/src/cipher.c new file mode 100644 index 0000000..7f4c121 --- /dev/null +++ b/tf-psa-crypto/drivers/builtin/src/cipher.c @@ -0,0 +1,1683 @@ +/** + * \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_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; + } +} + +static int 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]; + if (padding_len == 0 || padding_len > input_len) { + return MBEDTLS_ERR_CIPHER_INVALID_PADDING; + } + *data_len = input_len - padding_len; + + 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)); + } + + 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 = 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 */ |