657 lines
22 KiB
C
657 lines
22 KiB
C
/*
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* PSA AEAD 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_aead.h"
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#include "psa_crypto_core.h"
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#include <string.h>
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#include "mbedtls/platform.h"
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#if !defined(MBEDTLS_PLATFORM_C)
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#define mbedtls_calloc calloc
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#define mbedtls_free free
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#endif
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#include "mbedtls/ccm.h"
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#include "mbedtls/chachapoly.h"
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#include "mbedtls/cipher.h"
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#include "mbedtls/gcm.h"
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#include "mbedtls/error.h"
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static psa_status_t psa_aead_setup(
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mbedtls_psa_aead_operation_t *operation,
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const psa_key_attributes_t *attributes,
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const uint8_t *key_buffer,
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size_t key_buffer_size,
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psa_algorithm_t alg )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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size_t key_bits;
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const mbedtls_cipher_info_t *cipher_info;
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mbedtls_cipher_id_t cipher_id;
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size_t full_tag_length = 0;
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( void ) key_buffer_size;
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key_bits = attributes->core.bits;
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cipher_info = mbedtls_cipher_info_from_psa( alg,
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attributes->core.type, key_bits,
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&cipher_id );
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if( cipher_info == NULL )
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return( PSA_ERROR_NOT_SUPPORTED );
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switch( PSA_ALG_AEAD_WITH_SHORTENED_TAG( alg, 0 ) )
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{
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
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case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, 0 ):
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operation->alg = PSA_ALG_CCM;
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full_tag_length = 16;
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/* CCM allows the following tag lengths: 4, 6, 8, 10, 12, 14, 16.
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* The call to mbedtls_ccm_encrypt_and_tag or
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* mbedtls_ccm_auth_decrypt will validate the tag length. */
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if( PSA_BLOCK_CIPHER_BLOCK_LENGTH( attributes->core.type ) != 16 )
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return( PSA_ERROR_INVALID_ARGUMENT );
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mbedtls_ccm_init( &operation->ctx.ccm );
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status = mbedtls_to_psa_error(
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mbedtls_ccm_setkey( &operation->ctx.ccm, cipher_id,
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key_buffer, (unsigned int) key_bits ) );
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if( status != PSA_SUCCESS )
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return( status );
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break;
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
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case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_GCM, 0 ):
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operation->alg = PSA_ALG_GCM;
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full_tag_length = 16;
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/* GCM allows the following tag lengths: 4, 8, 12, 13, 14, 15, 16.
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* The call to mbedtls_gcm_crypt_and_tag or
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* mbedtls_gcm_auth_decrypt will validate the tag length. */
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if( PSA_BLOCK_CIPHER_BLOCK_LENGTH( attributes->core.type ) != 16 )
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return( PSA_ERROR_INVALID_ARGUMENT );
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mbedtls_gcm_init( &operation->ctx.gcm );
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status = mbedtls_to_psa_error(
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mbedtls_gcm_setkey( &operation->ctx.gcm, cipher_id,
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key_buffer, (unsigned int) key_bits ) );
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if( status != PSA_SUCCESS )
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return( status );
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break;
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
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case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CHACHA20_POLY1305, 0 ):
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operation->alg = PSA_ALG_CHACHA20_POLY1305;
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full_tag_length = 16;
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/* We only support the default tag length. */
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if( alg != PSA_ALG_CHACHA20_POLY1305 )
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return( PSA_ERROR_NOT_SUPPORTED );
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mbedtls_chachapoly_init( &operation->ctx.chachapoly );
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status = mbedtls_to_psa_error(
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mbedtls_chachapoly_setkey( &operation->ctx.chachapoly,
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key_buffer ) );
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if( status != PSA_SUCCESS )
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return( status );
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break;
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
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default:
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(void) status;
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(void) key_buffer;
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return( PSA_ERROR_NOT_SUPPORTED );
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}
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if( PSA_AEAD_TAG_LENGTH( attributes->core.type,
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key_bits, alg )
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> full_tag_length )
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return( PSA_ERROR_INVALID_ARGUMENT );
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operation->key_type = psa_get_key_type( attributes );
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operation->tag_length = PSA_AEAD_TAG_LENGTH( operation->key_type,
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key_bits,
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alg );
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return( PSA_SUCCESS );
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}
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psa_status_t mbedtls_psa_aead_encrypt(
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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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const uint8_t *nonce, size_t nonce_length,
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const uint8_t *additional_data, size_t additional_data_length,
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const uint8_t *plaintext, size_t plaintext_length,
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uint8_t *ciphertext, size_t ciphertext_size, size_t *ciphertext_length )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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mbedtls_psa_aead_operation_t operation = MBEDTLS_PSA_AEAD_OPERATION_INIT;
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uint8_t *tag;
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status = psa_aead_setup( &operation, attributes, key_buffer,
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key_buffer_size, alg );
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if( status != PSA_SUCCESS )
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goto exit;
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/* For all currently supported modes, the tag is at the end of the
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* ciphertext. */
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if( ciphertext_size < ( plaintext_length + operation.tag_length ) )
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{
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status = PSA_ERROR_BUFFER_TOO_SMALL;
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goto exit;
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}
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tag = ciphertext + plaintext_length;
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
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if( operation.alg == PSA_ALG_CCM )
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{
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status = mbedtls_to_psa_error(
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mbedtls_ccm_encrypt_and_tag( &operation.ctx.ccm,
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plaintext_length,
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nonce, nonce_length,
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additional_data,
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additional_data_length,
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plaintext, ciphertext,
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tag, operation.tag_length ) );
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}
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else
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
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if( operation.alg == PSA_ALG_GCM )
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{
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status = mbedtls_to_psa_error(
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mbedtls_gcm_crypt_and_tag( &operation.ctx.gcm,
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MBEDTLS_GCM_ENCRYPT,
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plaintext_length,
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nonce, nonce_length,
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additional_data, additional_data_length,
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plaintext, ciphertext,
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operation.tag_length, tag ) );
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}
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else
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
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if( operation.alg == PSA_ALG_CHACHA20_POLY1305 )
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{
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if( operation.tag_length != 16 )
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{
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status = PSA_ERROR_NOT_SUPPORTED;
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goto exit;
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}
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status = mbedtls_to_psa_error(
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mbedtls_chachapoly_encrypt_and_tag( &operation.ctx.chachapoly,
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plaintext_length,
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nonce,
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additional_data,
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additional_data_length,
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plaintext,
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ciphertext,
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tag ) );
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}
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else
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
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{
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(void) tag;
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(void) nonce;
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(void) nonce_length;
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(void) additional_data;
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(void) additional_data_length;
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(void) plaintext;
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return( PSA_ERROR_NOT_SUPPORTED );
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}
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if( status == PSA_SUCCESS )
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*ciphertext_length = plaintext_length + operation.tag_length;
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exit:
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mbedtls_psa_aead_abort( &operation );
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return( status );
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}
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/* Locate the tag in a ciphertext buffer containing the encrypted data
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* followed by the tag. Return the length of the part preceding the tag in
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* *plaintext_length. This is the size of the plaintext in modes where
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* the encrypted data has the same size as the plaintext, such as
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* CCM and GCM. */
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static psa_status_t psa_aead_unpadded_locate_tag( size_t tag_length,
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const uint8_t *ciphertext,
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size_t ciphertext_length,
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size_t plaintext_size,
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const uint8_t **p_tag )
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{
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size_t payload_length;
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if( tag_length > ciphertext_length )
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return( PSA_ERROR_INVALID_ARGUMENT );
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payload_length = ciphertext_length - tag_length;
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if( payload_length > plaintext_size )
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return( PSA_ERROR_BUFFER_TOO_SMALL );
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*p_tag = ciphertext + payload_length;
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return( PSA_SUCCESS );
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}
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psa_status_t mbedtls_psa_aead_decrypt(
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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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const uint8_t *nonce, size_t nonce_length,
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const uint8_t *additional_data, size_t additional_data_length,
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const uint8_t *ciphertext, size_t ciphertext_length,
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uint8_t *plaintext, size_t plaintext_size, size_t *plaintext_length )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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mbedtls_psa_aead_operation_t operation = MBEDTLS_PSA_AEAD_OPERATION_INIT;
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const uint8_t *tag = NULL;
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status = psa_aead_setup( &operation, attributes, key_buffer,
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key_buffer_size, alg );
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if( status != PSA_SUCCESS )
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goto exit;
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status = psa_aead_unpadded_locate_tag( operation.tag_length,
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ciphertext, ciphertext_length,
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plaintext_size, &tag );
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if( status != PSA_SUCCESS )
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goto exit;
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
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if( operation.alg == PSA_ALG_CCM )
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{
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status = mbedtls_to_psa_error(
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mbedtls_ccm_auth_decrypt( &operation.ctx.ccm,
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ciphertext_length - operation.tag_length,
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nonce, nonce_length,
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additional_data,
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additional_data_length,
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ciphertext, plaintext,
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tag, operation.tag_length ) );
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}
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else
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
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if( operation.alg == PSA_ALG_GCM )
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{
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status = mbedtls_to_psa_error(
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mbedtls_gcm_auth_decrypt( &operation.ctx.gcm,
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ciphertext_length - operation.tag_length,
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nonce, nonce_length,
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additional_data,
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additional_data_length,
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tag, operation.tag_length,
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ciphertext, plaintext ) );
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}
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else
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
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if( operation.alg == PSA_ALG_CHACHA20_POLY1305 )
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{
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if( operation.tag_length != 16 )
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{
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status = PSA_ERROR_NOT_SUPPORTED;
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goto exit;
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}
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status = mbedtls_to_psa_error(
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mbedtls_chachapoly_auth_decrypt( &operation.ctx.chachapoly,
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ciphertext_length - operation.tag_length,
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nonce,
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additional_data,
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additional_data_length,
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tag,
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ciphertext,
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plaintext ) );
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}
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else
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
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{
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(void) nonce;
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(void) nonce_length;
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(void) additional_data;
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(void) additional_data_length;
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(void) plaintext;
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return( PSA_ERROR_NOT_SUPPORTED );
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}
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if( status == PSA_SUCCESS )
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*plaintext_length = ciphertext_length - operation.tag_length;
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exit:
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mbedtls_psa_aead_abort( &operation );
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if( status == PSA_SUCCESS )
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*plaintext_length = ciphertext_length - operation.tag_length;
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return( status );
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}
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/* Set the key and algorithm for a multipart authenticated encryption
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* operation. */
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psa_status_t mbedtls_psa_aead_encrypt_setup(
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mbedtls_psa_aead_operation_t *operation,
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const psa_key_attributes_t *attributes,
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const uint8_t *key_buffer,
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size_t key_buffer_size,
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psa_algorithm_t alg )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
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if( operation->alg == PSA_ALG_CCM )
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{
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return( PSA_ERROR_NOT_SUPPORTED );
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}
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
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status = psa_aead_setup( operation, attributes, key_buffer,
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key_buffer_size, alg );
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if( status == PSA_SUCCESS )
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operation->is_encrypt = 1;
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return ( status );
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}
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/* Set the key and algorithm for a multipart authenticated decryption
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* operation. */
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psa_status_t mbedtls_psa_aead_decrypt_setup(
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mbedtls_psa_aead_operation_t *operation,
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const psa_key_attributes_t *attributes,
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const uint8_t *key_buffer,
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size_t key_buffer_size,
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psa_algorithm_t alg )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
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if( operation->alg == PSA_ALG_CCM )
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{
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return( PSA_ERROR_NOT_SUPPORTED );
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}
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
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status = psa_aead_setup( operation, attributes, key_buffer,
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key_buffer_size, alg );
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if( status == PSA_SUCCESS )
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operation->is_encrypt = 0;
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return ( status );
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}
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/* Set a nonce for the multipart AEAD operation*/
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psa_status_t mbedtls_psa_aead_set_nonce(
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mbedtls_psa_aead_operation_t *operation,
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const uint8_t *nonce,
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size_t nonce_length )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
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if( operation->alg == PSA_ALG_GCM )
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{
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status = mbedtls_to_psa_error(
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mbedtls_gcm_starts( &operation->ctx.gcm,
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operation->is_encrypt ?
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MBEDTLS_GCM_ENCRYPT : MBEDTLS_GCM_DECRYPT,
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nonce,
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nonce_length ) );
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}
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else
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
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if( operation->alg == PSA_ALG_CHACHA20_POLY1305 )
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{
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/* Note - ChaChaPoly allows an 8 byte nonce, but we would have to
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* allocate a buffer in the operation, copy the nonce to it and pad
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* it, so for now check the nonce is 12 bytes, as
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* mbedtls_chachapoly_starts() assumes it can read 12 bytes from the
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* passed in buffer. */
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if( nonce_length != 12 )
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{
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return( PSA_ERROR_INVALID_ARGUMENT );
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}
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status = mbedtls_to_psa_error(
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mbedtls_chachapoly_starts( &operation->ctx.chachapoly,
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nonce,
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operation->is_encrypt ?
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MBEDTLS_CHACHAPOLY_ENCRYPT :
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MBEDTLS_CHACHAPOLY_DECRYPT ) );
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}
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else
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#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
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{
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( void ) operation;
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( void ) nonce;
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( void ) nonce_length;
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return ( PSA_ERROR_NOT_SUPPORTED );
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}
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return( status );
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}
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/* Declare the lengths of the message and additional data for AEAD. */
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psa_status_t mbedtls_psa_aead_set_lengths(
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mbedtls_psa_aead_operation_t *operation,
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size_t ad_length,
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size_t plaintext_length )
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{
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/* Nothing here yet, work is currently done in PSA Core, however support
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* for CCM will require this function. */
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( void ) operation;
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( void ) ad_length;
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( void ) plaintext_length;
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return ( PSA_SUCCESS );
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}
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/* Pass additional data to an active multipart AEAD operation. */
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psa_status_t mbedtls_psa_aead_update_ad(
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mbedtls_psa_aead_operation_t *operation,
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|
const uint8_t *input,
|
|
size_t input_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
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|
if( operation->alg == PSA_ALG_GCM )
|
|
{
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|
status = mbedtls_to_psa_error(
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mbedtls_gcm_update_ad( &operation->ctx.gcm, input, input_length ) );
|
|
}
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|
else
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
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|
if( operation->alg == PSA_ALG_CHACHA20_POLY1305 )
|
|
{
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_chachapoly_update_aad( &operation->ctx.chachapoly,
|
|
input,
|
|
input_length ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
|
|
{
|
|
( void ) operation;
|
|
( void ) input;
|
|
( void ) input_length;
|
|
|
|
return ( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
return ( status );
|
|
}
|
|
|
|
/* Encrypt or decrypt a message fragment in an active multipart AEAD
|
|
* operation.*/
|
|
psa_status_t mbedtls_psa_aead_update(
|
|
mbedtls_psa_aead_operation_t *operation,
|
|
const uint8_t *input,
|
|
size_t input_length,
|
|
uint8_t *output,
|
|
size_t output_size,
|
|
size_t *output_length )
|
|
{
|
|
size_t update_output_length;
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
|
|
update_output_length = input_length;
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
|
|
if( operation->alg == PSA_ALG_GCM )
|
|
{
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_gcm_update( &operation->ctx.gcm,
|
|
input, input_length,
|
|
output, output_size,
|
|
&update_output_length ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
|
|
if( operation->alg == PSA_ALG_CHACHA20_POLY1305 )
|
|
{
|
|
if( output_size < input_length )
|
|
return( PSA_ERROR_BUFFER_TOO_SMALL );
|
|
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_chachapoly_update( &operation->ctx.chachapoly,
|
|
input_length,
|
|
input,
|
|
output ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
|
|
{
|
|
( void ) operation;
|
|
( void ) input;
|
|
( void ) output;
|
|
( void ) output_size;
|
|
|
|
return ( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
if( status == PSA_SUCCESS )
|
|
*output_length = update_output_length;
|
|
|
|
return( status );
|
|
}
|
|
|
|
/* Finish encrypting a message in a multipart AEAD operation. */
|
|
psa_status_t mbedtls_psa_aead_finish(
|
|
mbedtls_psa_aead_operation_t *operation,
|
|
uint8_t *ciphertext,
|
|
size_t ciphertext_size,
|
|
size_t *ciphertext_length,
|
|
uint8_t *tag,
|
|
size_t tag_size,
|
|
size_t *tag_length )
|
|
{
|
|
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
size_t finish_output_size = 0;
|
|
|
|
if( tag_size < operation->tag_length )
|
|
return( PSA_ERROR_BUFFER_TOO_SMALL );
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
|
|
if( operation->alg == PSA_ALG_GCM )
|
|
{
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_gcm_finish( &operation->ctx.gcm,
|
|
ciphertext, ciphertext_size, ciphertext_length,
|
|
tag, operation->tag_length ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
|
|
if( operation->alg == PSA_ALG_CHACHA20_POLY1305 )
|
|
{
|
|
/* Belt and braces. Although the above tag_size check should have
|
|
* already done this, if we later start supporting smaller tag sizes
|
|
* for chachapoly, then passing a tag buffer smaller than 16 into here
|
|
* could cause a buffer overflow, so better safe than sorry. */
|
|
if( tag_size < 16 )
|
|
return( PSA_ERROR_BUFFER_TOO_SMALL );
|
|
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_chachapoly_finish( &operation->ctx.chachapoly,
|
|
tag ) );
|
|
}
|
|
else
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
|
|
{
|
|
( void ) ciphertext;
|
|
( void ) ciphertext_size;
|
|
( void ) ciphertext_length;
|
|
( void ) tag;
|
|
( void ) tag_size;
|
|
( void ) tag_length;
|
|
|
|
return ( PSA_ERROR_NOT_SUPPORTED );
|
|
}
|
|
|
|
if( status == PSA_SUCCESS )
|
|
{
|
|
/* This will be zero for all supported algorithms currently, but left
|
|
* here for future support. */
|
|
*ciphertext_length = finish_output_size;
|
|
*tag_length = operation->tag_length;
|
|
}
|
|
|
|
return ( status );
|
|
}
|
|
|
|
/* Abort an AEAD operation */
|
|
psa_status_t mbedtls_psa_aead_abort(
|
|
mbedtls_psa_aead_operation_t *operation )
|
|
{
|
|
switch( operation->alg )
|
|
{
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CCM)
|
|
case PSA_ALG_CCM:
|
|
mbedtls_ccm_free( &operation->ctx.ccm );
|
|
break;
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CCM */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_GCM)
|
|
case PSA_ALG_GCM:
|
|
mbedtls_gcm_free( &operation->ctx.gcm );
|
|
break;
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_GCM */
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305)
|
|
case PSA_ALG_CHACHA20_POLY1305:
|
|
mbedtls_chachapoly_free( &operation->ctx.chachapoly );
|
|
break;
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_CHACHA20_POLY1305 */
|
|
}
|
|
|
|
operation->is_encrypt = 0;
|
|
|
|
return( PSA_SUCCESS );
|
|
}
|
|
|
|
#endif /* MBEDTLS_PSA_CRYPTO_C */
|
|
|