557 lines
18 KiB
C
557 lines
18 KiB
C
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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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#include "psa_crypto_core.h"
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#include "psa_crypto_random_impl.h"
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#include "mbedtls/cipher.h"
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#include "mbedtls/error.h"
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#include <string.h>
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const mbedtls_cipher_info_t *mbedtls_cipher_info_from_psa(
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psa_algorithm_t alg,
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psa_key_type_t key_type,
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size_t key_bits,
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mbedtls_cipher_id_t* cipher_id )
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{
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mbedtls_cipher_mode_t mode;
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mbedtls_cipher_id_t cipher_id_tmp;
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if( PSA_ALG_IS_AEAD( alg ) )
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alg = PSA_ALG_AEAD_WITH_SHORTENED_TAG( alg, 0 );
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if( PSA_ALG_IS_CIPHER( alg ) || PSA_ALG_IS_AEAD( alg ) )
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{
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switch( alg )
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{
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case PSA_ALG_STREAM_CIPHER:
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mode = MBEDTLS_MODE_STREAM;
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break;
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case PSA_ALG_CTR:
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mode = MBEDTLS_MODE_CTR;
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break;
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case PSA_ALG_CFB:
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mode = MBEDTLS_MODE_CFB;
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break;
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case PSA_ALG_OFB:
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mode = MBEDTLS_MODE_OFB;
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break;
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case PSA_ALG_ECB_NO_PADDING:
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mode = MBEDTLS_MODE_ECB;
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break;
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case PSA_ALG_CBC_NO_PADDING:
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mode = MBEDTLS_MODE_CBC;
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break;
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case PSA_ALG_CBC_PKCS7:
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mode = MBEDTLS_MODE_CBC;
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break;
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case PSA_ALG_CCM_STAR_NO_TAG:
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mode = MBEDTLS_MODE_CCM_STAR_NO_TAG;
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break;
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case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, 0 ):
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mode = MBEDTLS_MODE_CCM;
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break;
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case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_GCM, 0 ):
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mode = MBEDTLS_MODE_GCM;
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break;
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case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CHACHA20_POLY1305, 0 ):
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mode = MBEDTLS_MODE_CHACHAPOLY;
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break;
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default:
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return( NULL );
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}
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}
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else if( alg == PSA_ALG_CMAC )
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mode = MBEDTLS_MODE_ECB;
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else
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return( NULL );
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switch( key_type )
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{
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case PSA_KEY_TYPE_AES:
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cipher_id_tmp = MBEDTLS_CIPHER_ID_AES;
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break;
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case PSA_KEY_TYPE_ARIA:
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cipher_id_tmp = MBEDTLS_CIPHER_ID_ARIA;
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break;
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case PSA_KEY_TYPE_DES:
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/* key_bits is 64 for Single-DES, 128 for two-key Triple-DES,
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* and 192 for three-key Triple-DES. */
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if( key_bits == 64 )
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cipher_id_tmp = MBEDTLS_CIPHER_ID_DES;
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else
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cipher_id_tmp = MBEDTLS_CIPHER_ID_3DES;
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/* mbedtls doesn't recognize two-key Triple-DES as an algorithm,
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* but two-key Triple-DES is functionally three-key Triple-DES
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* with K1=K3, so that's how we present it to mbedtls. */
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if( key_bits == 128 )
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key_bits = 192;
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break;
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case PSA_KEY_TYPE_CAMELLIA:
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cipher_id_tmp = MBEDTLS_CIPHER_ID_CAMELLIA;
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break;
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case PSA_KEY_TYPE_CHACHA20:
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cipher_id_tmp = MBEDTLS_CIPHER_ID_CHACHA20;
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break;
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default:
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return( NULL );
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}
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if( cipher_id != NULL )
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*cipher_id = cipher_id_tmp;
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return( mbedtls_cipher_info_from_values( cipher_id_tmp,
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(int) key_bits, mode ) );
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}
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#if defined(MBEDTLS_PSA_BUILTIN_CIPHER)
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static psa_status_t psa_cipher_setup(
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mbedtls_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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mbedtls_cipher_init( &operation->ctx.cipher );
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operation->alg = alg;
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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 ||
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MBEDTLS_PSA_BUILTIN_ALG_CBC_PKCS7 */
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operation->block_length = ( PSA_ALG_IS_STREAM_CIPHER( alg ) ? 1 :
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PSA_BLOCK_CIPHER_BLOCK_LENGTH( key_type ) );
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operation->iv_length = PSA_CIPHER_IV_LENGTH( key_type, alg );
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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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mbedtls_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( psa_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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mbedtls_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( psa_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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psa_status_t mbedtls_psa_cipher_set_iv(
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mbedtls_psa_cipher_operation_t *operation,
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const uint8_t *iv, size_t iv_length )
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{
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if( iv_length != operation->iv_length )
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return( PSA_ERROR_INVALID_ARGUMENT );
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return( mbedtls_to_psa_error(
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mbedtls_cipher_set_iv( &operation->ctx.cipher,
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iv, iv_length ) ) );
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}
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/** Process input for which the algorithm is set to ECB mode.
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*
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* This requires manual processing, since the PSA API is defined as being
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* able to process arbitrary-length calls to psa_cipher_update() with ECB mode,
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* but the underlying mbedtls_cipher_update only takes full blocks.
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*
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* \param ctx The mbedtls cipher context to use. It must have been
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* set up for ECB.
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* \param[in] input The input plaintext or ciphertext to process.
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* \param input_length The number of bytes to process from \p input.
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* This does not need to be aligned to a block boundary.
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* If there is a partial block at the end of the input,
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* it is stored in \p ctx for future processing.
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* \param output The buffer where the output is written. It must be
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* at least `BS * floor((p + input_length) / BS)` bytes
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* long, where `p` is the number of bytes in the
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* unprocessed partial block in \p ctx (with
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* `0 <= p <= BS - 1`) and `BS` is the block size.
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* \param output_length On success, the number of bytes written to \p output.
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* \c 0 on error.
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*
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* \return #PSA_SUCCESS or an error from a hardware accelerator
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*/
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static psa_status_t psa_cipher_update_ecb(
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mbedtls_cipher_context_t *ctx,
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const uint8_t *input,
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size_t input_length,
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uint8_t *output,
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size_t *output_length )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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size_t block_size = ctx->cipher_info->block_size;
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size_t internal_output_length = 0;
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*output_length = 0;
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if( input_length == 0 )
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{
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status = PSA_SUCCESS;
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goto exit;
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}
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if( ctx->unprocessed_len > 0 )
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{
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/* Fill up to block size, and run the block if there's a full one. */
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size_t bytes_to_copy = block_size - ctx->unprocessed_len;
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if( input_length < bytes_to_copy )
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bytes_to_copy = input_length;
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memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ),
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input, bytes_to_copy );
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input_length -= bytes_to_copy;
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input += bytes_to_copy;
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ctx->unprocessed_len += bytes_to_copy;
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if( ctx->unprocessed_len == block_size )
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{
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status = mbedtls_to_psa_error(
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mbedtls_cipher_update( ctx,
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ctx->unprocessed_data,
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block_size,
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output, &internal_output_length ) );
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if( status != PSA_SUCCESS )
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goto exit;
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output += internal_output_length;
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*output_length += internal_output_length;
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ctx->unprocessed_len = 0;
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}
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}
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while( input_length >= block_size )
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{
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/* Run all full blocks we have, one by one */
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status = mbedtls_to_psa_error(
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mbedtls_cipher_update( ctx, input,
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block_size,
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output, &internal_output_length ) );
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if( status != PSA_SUCCESS )
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goto exit;
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input_length -= block_size;
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input += block_size;
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output += internal_output_length;
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*output_length += internal_output_length;
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}
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if( input_length > 0 )
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{
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/* Save unprocessed bytes for later processing */
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memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ),
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input, input_length );
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ctx->unprocessed_len += input_length;
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}
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status = PSA_SUCCESS;
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exit:
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return( status );
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}
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psa_status_t mbedtls_psa_cipher_update(
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mbedtls_psa_cipher_operation_t *operation,
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const uint8_t *input, size_t input_length,
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uint8_t *output, size_t output_size, size_t *output_length )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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size_t expected_output_size;
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if( ! PSA_ALG_IS_STREAM_CIPHER( operation->alg ) )
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{
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/* Take the unprocessed partial block left over from previous
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* update calls, if any, plus the input to this call. Remove
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* the last partial block, if any. You get the data that will be
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* output in this call. */
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expected_output_size =
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|
|
( operation->ctx.cipher.unprocessed_len + input_length )
|
||
|
|
/ operation->block_length * operation->block_length;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
expected_output_size = input_length;
|
||
|
|
}
|
||
|
|
|
||
|
|
if( output_size < expected_output_size )
|
||
|
|
return( PSA_ERROR_BUFFER_TOO_SMALL );
|
||
|
|
|
||
|
|
if( operation->alg == PSA_ALG_ECB_NO_PADDING )
|
||
|
|
{
|
||
|
|
/* mbedtls_cipher_update has an API inconsistency: it will only
|
||
|
|
* process a single block at a time in ECB mode. Abstract away that
|
||
|
|
* inconsistency here to match the PSA API behaviour. */
|
||
|
|
status = psa_cipher_update_ecb( &operation->ctx.cipher,
|
||
|
|
input,
|
||
|
|
input_length,
|
||
|
|
output,
|
||
|
|
output_length );
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
status = mbedtls_to_psa_error(
|
||
|
|
mbedtls_cipher_update( &operation->ctx.cipher, input,
|
||
|
|
input_length, output, output_length ) );
|
||
|
|
|
||
|
|
if( *output_length > output_size )
|
||
|
|
return( PSA_ERROR_CORRUPTION_DETECTED );
|
||
|
|
}
|
||
|
|
|
||
|
|
return( status );
|
||
|
|
}
|
||
|
|
|
||
|
|
psa_status_t mbedtls_psa_cipher_finish(
|
||
|
|
mbedtls_psa_cipher_operation_t *operation,
|
||
|
|
uint8_t *output, size_t output_size, size_t *output_length )
|
||
|
|
{
|
||
|
|
psa_status_t status = PSA_ERROR_GENERIC_ERROR;
|
||
|
|
uint8_t temp_output_buffer[MBEDTLS_MAX_BLOCK_LENGTH];
|
||
|
|
|
||
|
|
if( operation->ctx.cipher.unprocessed_len != 0 )
|
||
|
|
{
|
||
|
|
if( operation->alg == PSA_ALG_ECB_NO_PADDING ||
|
||
|
|
operation->alg == PSA_ALG_CBC_NO_PADDING )
|
||
|
|
{
|
||
|
|
status = PSA_ERROR_INVALID_ARGUMENT;
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
status = mbedtls_to_psa_error(
|
||
|
|
mbedtls_cipher_finish( &operation->ctx.cipher,
|
||
|
|
temp_output_buffer,
|
||
|
|
output_length ) );
|
||
|
|
if( status != PSA_SUCCESS )
|
||
|
|
goto exit;
|
||
|
|
|
||
|
|
if( *output_length == 0 )
|
||
|
|
; /* Nothing to copy. Note that output may be NULL in this case. */
|
||
|
|
else if( output_size >= *output_length )
|
||
|
|
memcpy( output, temp_output_buffer, *output_length );
|
||
|
|
else
|
||
|
|
status = PSA_ERROR_BUFFER_TOO_SMALL;
|
||
|
|
|
||
|
|
exit:
|
||
|
|
mbedtls_platform_zeroize( temp_output_buffer,
|
||
|
|
sizeof( temp_output_buffer ) );
|
||
|
|
|
||
|
|
return( status );
|
||
|
|
}
|
||
|
|
|
||
|
|
psa_status_t mbedtls_psa_cipher_abort(
|
||
|
|
mbedtls_psa_cipher_operation_t *operation )
|
||
|
|
{
|
||
|
|
/* Sanity check (shouldn't happen: operation->alg should
|
||
|
|
* always have been initialized to a valid value). */
|
||
|
|
if( ! PSA_ALG_IS_CIPHER( operation->alg ) )
|
||
|
|
return( PSA_ERROR_BAD_STATE );
|
||
|
|
|
||
|
|
mbedtls_cipher_free( &operation->ctx.cipher );
|
||
|
|
|
||
|
|
return( PSA_SUCCESS );
|
||
|
|
}
|
||
|
|
|
||
|
|
psa_status_t mbedtls_psa_cipher_encrypt(
|
||
|
|
const psa_key_attributes_t *attributes,
|
||
|
|
const uint8_t *key_buffer,
|
||
|
|
size_t key_buffer_size,
|
||
|
|
psa_algorithm_t alg,
|
||
|
|
const uint8_t *iv,
|
||
|
|
size_t iv_length,
|
||
|
|
const uint8_t *input,
|
||
|
|
size_t input_length,
|
||
|
|
uint8_t *output,
|
||
|
|
size_t output_size,
|
||
|
|
size_t *output_length )
|
||
|
|
{
|
||
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
||
|
|
mbedtls_psa_cipher_operation_t operation = MBEDTLS_PSA_CIPHER_OPERATION_INIT;
|
||
|
|
size_t update_output_length, finish_output_length;
|
||
|
|
|
||
|
|
status = mbedtls_psa_cipher_encrypt_setup( &operation, attributes,
|
||
|
|
key_buffer, key_buffer_size,
|
||
|
|
alg );
|
||
|
|
if( status != PSA_SUCCESS )
|
||
|
|
goto exit;
|
||
|
|
|
||
|
|
if( iv_length > 0 )
|
||
|
|
{
|
||
|
|
status = mbedtls_psa_cipher_set_iv( &operation, iv, iv_length );
|
||
|
|
if( status != PSA_SUCCESS )
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
status = mbedtls_psa_cipher_update( &operation, input, input_length,
|
||
|
|
output, output_size,
|
||
|
|
&update_output_length );
|
||
|
|
if( status != PSA_SUCCESS )
|
||
|
|
goto exit;
|
||
|
|
|
||
|
|
status = mbedtls_psa_cipher_finish( &operation,
|
||
|
|
output + update_output_length,
|
||
|
|
output_size - update_output_length,
|
||
|
|
&finish_output_length );
|
||
|
|
if( status != PSA_SUCCESS )
|
||
|
|
goto exit;
|
||
|
|
|
||
|
|
*output_length = update_output_length + finish_output_length;
|
||
|
|
|
||
|
|
exit:
|
||
|
|
if( status == PSA_SUCCESS )
|
||
|
|
status = mbedtls_psa_cipher_abort( &operation );
|
||
|
|
else
|
||
|
|
mbedtls_psa_cipher_abort( &operation );
|
||
|
|
|
||
|
|
return( status );
|
||
|
|
}
|
||
|
|
|
||
|
|
psa_status_t mbedtls_psa_cipher_decrypt(
|
||
|
|
const psa_key_attributes_t *attributes,
|
||
|
|
const uint8_t *key_buffer,
|
||
|
|
size_t key_buffer_size,
|
||
|
|
psa_algorithm_t alg,
|
||
|
|
const uint8_t *input,
|
||
|
|
size_t input_length,
|
||
|
|
uint8_t *output,
|
||
|
|
size_t output_size,
|
||
|
|
size_t *output_length )
|
||
|
|
{
|
||
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
||
|
|
mbedtls_psa_cipher_operation_t operation = MBEDTLS_PSA_CIPHER_OPERATION_INIT;
|
||
|
|
size_t olength, accumulated_length;
|
||
|
|
|
||
|
|
status = mbedtls_psa_cipher_decrypt_setup( &operation, attributes,
|
||
|
|
key_buffer, key_buffer_size,
|
||
|
|
alg );
|
||
|
|
if( status != PSA_SUCCESS )
|
||
|
|
goto exit;
|
||
|
|
|
||
|
|
if( operation.iv_length > 0 )
|
||
|
|
{
|
||
|
|
status = mbedtls_psa_cipher_set_iv( &operation,
|
||
|
|
input, operation.iv_length );
|
||
|
|
if( status != PSA_SUCCESS )
|
||
|
|
goto exit;
|
||
|
|
}
|
||
|
|
|
||
|
|
status = mbedtls_psa_cipher_update( &operation, input + operation.iv_length,
|
||
|
|
input_length - operation.iv_length,
|
||
|
|
output, output_size, &olength );
|
||
|
|
if( status != PSA_SUCCESS )
|
||
|
|
goto exit;
|
||
|
|
|
||
|
|
accumulated_length = olength;
|
||
|
|
|
||
|
|
status = mbedtls_psa_cipher_finish( &operation, output + accumulated_length,
|
||
|
|
output_size - accumulated_length,
|
||
|
|
&olength );
|
||
|
|
if( status != PSA_SUCCESS )
|
||
|
|
goto exit;
|
||
|
|
|
||
|
|
*output_length = accumulated_length + olength;
|
||
|
|
|
||
|
|
exit:
|
||
|
|
if ( status == PSA_SUCCESS )
|
||
|
|
status = mbedtls_psa_cipher_abort( &operation );
|
||
|
|
else
|
||
|
|
mbedtls_psa_cipher_abort( &operation );
|
||
|
|
|
||
|
|
return( status );
|
||
|
|
}
|
||
|
|
#endif /* MBEDTLS_PSA_BUILTIN_CIPHER */
|
||
|
|
|
||
|
|
#endif /* MBEDTLS_PSA_CRYPTO_C */
|