2021-03-08 16:46:35 +01:00
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/*
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* PSA cipher driver entry points
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "common.h"
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#if defined(MBEDTLS_PSA_CRYPTO_C)
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#include <psa_crypto_cipher.h>
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2020-12-14 14:56:02 +01:00
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#include "psa_crypto_core.h"
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#include "mbedtls/cipher.h"
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2021-03-08 16:46:35 +01:00
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2020-12-14 14:56:02 +01:00
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#include <string.h>
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static psa_status_t cipher_setup(
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psa_cipher_operation_t *operation,
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const psa_key_attributes_t *attributes,
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const uint8_t *key_buffer, size_t key_buffer_size,
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psa_algorithm_t alg,
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mbedtls_operation_t cipher_operation )
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{
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int ret = 0;
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size_t key_bits;
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const mbedtls_cipher_info_t *cipher_info = NULL;
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psa_key_type_t key_type = attributes->core.type;
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(void)key_buffer_size;
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/* Proceed with initializing an mbed TLS cipher context if no driver is
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* available for the given algorithm & key. */
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mbedtls_cipher_init( &operation->ctx.cipher );
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/* Once the cipher context is initialised, it needs to be freed using
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* psa_cipher_abort. Indicate there is something to be freed through setting
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* alg, and indicate the operation is being done using mbedtls crypto through
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* setting mbedtls_in_use. */
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operation->alg = alg;
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operation->mbedtls_in_use = 1;
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key_bits = attributes->core.bits;
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cipher_info = mbedtls_cipher_info_from_psa( alg, key_type,
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key_bits, NULL );
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if( cipher_info == NULL )
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return( PSA_ERROR_NOT_SUPPORTED );
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ret = mbedtls_cipher_setup( &operation->ctx.cipher, cipher_info );
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if( ret != 0 )
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goto exit;
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#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_DES)
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if( key_type == PSA_KEY_TYPE_DES && key_bits == 128 )
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{
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/* Two-key Triple-DES is 3-key Triple-DES with K1=K3 */
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uint8_t keys[24];
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memcpy( keys, key_buffer, 16 );
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memcpy( keys + 16, key_buffer, 8 );
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ret = mbedtls_cipher_setkey( &operation->ctx.cipher,
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keys,
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192, cipher_operation );
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}
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else
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#endif
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{
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ret = mbedtls_cipher_setkey( &operation->ctx.cipher, key_buffer,
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(int) key_bits, cipher_operation );
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}
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if( ret != 0 )
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goto exit;
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_CBC_NO_PADDING) || \
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defined(MBEDTLS_PSA_BUILTIN_ALG_CBC_PKCS7)
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switch( alg )
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{
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case PSA_ALG_CBC_NO_PADDING:
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ret = mbedtls_cipher_set_padding_mode( &operation->ctx.cipher,
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MBEDTLS_PADDING_NONE );
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break;
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case PSA_ALG_CBC_PKCS7:
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ret = mbedtls_cipher_set_padding_mode( &operation->ctx.cipher,
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MBEDTLS_PADDING_PKCS7 );
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break;
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default:
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/* The algorithm doesn't involve padding. */
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ret = 0;
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break;
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}
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if( ret != 0 )
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goto exit;
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_CBC_NO_PADDING || MBEDTLS_PSA_BUILTIN_ALG_CBC_PKCS7 */
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operation->block_size = ( PSA_ALG_IS_STREAM_CIPHER( alg ) ? 1 :
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PSA_BLOCK_CIPHER_BLOCK_LENGTH( key_type ) );
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if( ( alg & PSA_ALG_CIPHER_FROM_BLOCK_FLAG ) != 0 &&
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alg != PSA_ALG_ECB_NO_PADDING )
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{
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operation->iv_size = PSA_BLOCK_CIPHER_BLOCK_LENGTH( key_type );
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}
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#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_CHACHA20)
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else
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if( ( alg == PSA_ALG_STREAM_CIPHER ) &&
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( key_type == PSA_KEY_TYPE_CHACHA20 ) )
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operation->iv_size = 12;
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#endif
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exit:
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return( mbedtls_to_psa_error( ret ) );
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}
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psa_status_t mbedtls_psa_cipher_encrypt_setup(
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psa_cipher_operation_t *operation,
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const psa_key_attributes_t *attributes,
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const uint8_t *key_buffer, size_t key_buffer_size,
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psa_algorithm_t alg )
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{
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return( cipher_setup( operation, attributes,
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key_buffer, key_buffer_size,
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alg, MBEDTLS_ENCRYPT ) );
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}
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psa_status_t mbedtls_psa_cipher_decrypt_setup(
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psa_cipher_operation_t *operation,
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const psa_key_attributes_t *attributes,
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const uint8_t *key_buffer, size_t key_buffer_size,
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psa_algorithm_t alg )
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{
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return( cipher_setup( operation, attributes,
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key_buffer, key_buffer_size,
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alg, MBEDTLS_DECRYPT ) );
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}
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2021-03-08 16:46:35 +01:00
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#endif /* MBEDTLS_PSA_CRYPTO_C */
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