diff options
Diffstat (limited to 'library/cipher.c')
| -rw-r--r-- | library/cipher.c | 1591 |
1 files changed, 1591 insertions, 0 deletions
diff --git a/library/cipher.c b/library/cipher.c new file mode 100644 index 000000000..dffe3adca --- /dev/null +++ b/library/cipher.c @@ -0,0 +1,1591 @@ +/** + * \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 + * + * Licensed under the Apache License, Version 2.0 (the "License"); you may + * not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT + * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +#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 <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) +#include "psa/crypto.h" +#include "mbedtls/psa_util.h" +#endif /* MBEDTLS_USE_PSA_CRYPTO */ + +#if defined(MBEDTLS_NIST_KW_C) +#include "mbedtls/nist_kw.h" +#endif + +#include "mbedtls/platform.h" + +static int supported_init = 0; + +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( def->info->base->cipher == cipher_id && + def->info->key_bitlen == (unsigned) key_bitlen && + def->info->mode == mode ) + return( def->info ); + + return( NULL ); +} + +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) + 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_platform_zeroize( cipher_psa, sizeof( *cipher_psa ) ); + mbedtls_free( cipher_psa ); + } + + mbedtls_platform_zeroize( ctx, sizeof(mbedtls_cipher_context_t) ); + return; + } +#endif /* MBEDTLS_USE_PSA_CRYPTO */ + +#if defined(MBEDTLS_CMAC_C) + if( ctx->cmac_ctx ) + { + mbedtls_platform_zeroize( ctx->cmac_ctx, + sizeof( mbedtls_cmac_context_t ) ); + mbedtls_free( ctx->cmac_ctx ); + } +#endif + + if( ctx->cipher_ctx ) + ctx->cipher_info->base->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( NULL == ( ctx->cipher_ctx = cipher_info->base->ctx_alloc_func() ) ) + return( MBEDTLS_ERR_CIPHER_ALLOC_FAILED ); + + ctx->cipher_info = cipher_info; + +#if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING) + /* + * Ignore possible errors caused by a cipher mode that doesn't use padding + */ +#if defined(MBEDTLS_CIPHER_PADDING_PKCS7) + (void) mbedtls_cipher_set_padding_mode( ctx, MBEDTLS_PADDING_PKCS7 ); +#else + (void) mbedtls_cipher_set_padding_mode( ctx, MBEDTLS_PADDING_NONE ); +#endif +#endif /* MBEDTLS_CIPHER_MODE_WITH_PADDING */ + + return( 0 ); +} + +#if defined(MBEDTLS_USE_PSA_CRYPTO) +#if !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( cipher_info->mode, taglen ); + if( alg == 0 ) + return( MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE ); + if( mbedtls_psa_translate_cipher_type( 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_DEPRECATED_REMOVED */ +#endif /* MBEDTLS_USE_PSA_CRYPTO */ + +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_USE_PSA_CRYPTO) + 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( + 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, + /* mbedtls_psa_translate_cipher_operation( operation ); */ + 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 */ + + if( ( ctx->cipher_info->flags & MBEDTLS_CIPHER_VARIABLE_KEY_LEN ) == 0 && + (int) ctx->cipher_info->key_bitlen != key_bitlen ) + { + return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); + } + + ctx->key_bitlen = key_bitlen; + ctx->operation = operation; + + /* + * For OFB, CFB and CTR mode always use the encryption key schedule + */ + if( MBEDTLS_ENCRYPT == operation || + MBEDTLS_MODE_CFB == ctx->cipher_info->mode || + MBEDTLS_MODE_OFB == ctx->cipher_info->mode || + MBEDTLS_MODE_CTR == ctx->cipher_info->mode ) + { + return( ctx->cipher_info->base->setkey_enc_func( ctx->cipher_ctx, key, + ctx->key_bitlen ) ); + } + + if( MBEDTLS_DECRYPT == operation ) + return( ctx->cipher_info->base->setkey_dec_func( ctx->cipher_ctx, key, + ctx->key_bitlen ) ); + + 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) + 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 */ + + /* 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 = ctx->cipher_info->iv_size; + + /* 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 ( 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 ( 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 == 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 == 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) + 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 */ + + 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) + 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 */ + +#if defined(MBEDTLS_GCM_C) + if( MBEDTLS_MODE_GCM == 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 == 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) + 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 */ + + *olen = 0; + block_size = mbedtls_cipher_get_block_size( ctx ); + if ( 0 == block_size ) + { + return( MBEDTLS_ERR_CIPHER_INVALID_CONTEXT ); + } + + if( ctx->cipher_info->mode == MBEDTLS_MODE_ECB ) + { + if( ilen != block_size ) + return( MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED ); + + *olen = ilen; + + if( 0 != ( ret = ctx->cipher_info->base->ecb_func( ctx->cipher_ctx, + ctx->operation, input, output ) ) ) + { + return( ret ); + } + + return( 0 ); + } + +#if defined(MBEDTLS_GCM_C) + if( 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( 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 ( 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( 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 = ctx->cipher_info->base->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 = ctx->cipher_info->base->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( ctx->cipher_info->mode == MBEDTLS_MODE_CFB ) + { + if( 0 != ( ret = ctx->cipher_info->base->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( ctx->cipher_info->mode == MBEDTLS_MODE_OFB ) + { + if( 0 != ( ret = ctx->cipher_info->base->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( ctx->cipher_info->mode == MBEDTLS_MODE_CTR ) + { + if( 0 != ( ret = ctx->cipher_info->base->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( 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 = ctx->cipher_info->base->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( ctx->cipher_info->mode == MBEDTLS_MODE_STREAM ) + { + if( 0 != ( ret = ctx->cipher_info->base->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, bad = 0; + + 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 |= padding_len > input_len; + bad |= 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++ ) + bad |= ( input[i] ^ padding_len ) * ( i >= pad_idx ); + + return( MBEDTLS_ERR_CIPHER_INVALID_PADDING * ( bad != 0 ) ); +} +#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 ) +{ + size_t i; + unsigned char done = 0, prev_done, bad; + + if( NULL == input || NULL == data_len ) + return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); + + bad = 0x80; + *data_len = 0; + for( i = input_len; i > 0; i-- ) + { + prev_done = done; + done |= ( input[i - 1] != 0 ); + *data_len |= ( i - 1 ) * ( done != prev_done ); + bad ^= input[i - 1] * ( done != prev_done ); + } + + return( MBEDTLS_ERR_CIPHER_INVALID_PADDING * ( bad != 0 ) ); + +} +#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, bad = 0; + + 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 |= padding_len > input_len; + bad |= 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++ ) + bad |= input[i] * ( i >= pad_idx ); + + return( MBEDTLS_ERR_CIPHER_INVALID_PADDING * ( bad != 0 ) ); +} +#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 ) +{ + size_t i; + + for( i = data_len; i < output_len; i++ ) + output[i] = 0x00; +} + +static int get_zeros_padding( unsigned char *input, size_t input_len, + size_t *data_len ) +{ + size_t i; + unsigned char done = 0, 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 |= ( input[i-1] != 0 ); + *data_len |= i * ( done != prev_done ); + } + + 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) + 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 */ + + *olen = 0; + + if( MBEDTLS_MODE_CFB == ctx->cipher_info->mode || + MBEDTLS_MODE_OFB == ctx->cipher_info->mode || + MBEDTLS_MODE_CTR == ctx->cipher_info->mode || + MBEDTLS_MODE_GCM == ctx->cipher_info->mode || + MBEDTLS_MODE_CCM_STAR_NO_TAG == ctx->cipher_info->mode || + MBEDTLS_MODE_XTS == ctx->cipher_info->mode || + MBEDTLS_MODE_STREAM == ctx->cipher_info->mode ) + { + return( 0 ); + } + + if ( ( MBEDTLS_CIPHER_CHACHA20 == ctx->cipher_info->type ) || + ( MBEDTLS_CIPHER_CHACHA20_POLY1305 == ctx->cipher_info->type ) ) + { + return( 0 ); + } + + if( MBEDTLS_MODE_ECB == 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 == 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 = ctx->cipher_info->base->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 != ctx->cipher_info->mode ) + { + return( MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA ); + } + +#if defined(MBEDTLS_USE_PSA_CRYPTO) + 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 */ + + 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) + 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 */ + +#if defined(MBEDTLS_GCM_C) + if( MBEDTLS_MODE_GCM == 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 == 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) + 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 */ + + /* Status to return on a non-authenticated algorithm. */ + ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; + +#if defined(MBEDTLS_GCM_C) + if( MBEDTLS_MODE_GCM == 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 == 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) + 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( 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 */ + + 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) + 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 */ + +#if defined(MBEDTLS_GCM_C) + if( MBEDTLS_MODE_GCM == 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 == 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 == ctx->cipher_info->type ) + { + /* ChachaPoly has fixed length nonce and MAC (tag) */ + if ( ( iv_len != ctx->cipher_info->iv_size ) || + ( 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) + 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 */ + +#if defined(MBEDTLS_GCM_C) + if( MBEDTLS_MODE_GCM == 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 == 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 == ctx->cipher_info->type ) + { + int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED; + + /* ChachaPoly has fixed length nonce and MAC (tag) */ + if ( ( iv_len != ctx->cipher_info->iv_size ) || + ( 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) + ctx->psa_enabled == 0 && +#endif + ( MBEDTLS_MODE_KW == ctx->cipher_info->mode || + MBEDTLS_MODE_KWP == ctx->cipher_info->mode ) ) + { + mbedtls_nist_kw_mode_t mode = ( MBEDTLS_MODE_KW == 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) + ctx->psa_enabled == 0 && +#endif + ( MBEDTLS_MODE_KW == ctx->cipher_info->mode || + MBEDTLS_MODE_KWP == ctx->cipher_info->mode ) ) + { + mbedtls_nist_kw_mode_t mode = ( MBEDTLS_MODE_KW == 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 */ |