/* * PSA cipher driver entry points */ /* * 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_PSA_CRYPTO_C) #include #include "psa_crypto_core.h" #include "psa_crypto_random_impl.h" #include "mbedtls/cipher.h" #include "mbedtls/error.h" #include #if ( defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_DES) || \ ( defined(PSA_CRYPTO_DRIVER_TEST) && \ defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_DES) ) ) #define BUILTIN_KEY_TYPE_DES 1 #endif #if ( defined(MBEDTLS_PSA_BUILTIN_ALG_CBC_NO_PADDING) || \ ( defined(PSA_CRYPTO_DRIVER_TEST) && \ defined(MBEDTLS_PSA_ACCEL_ALG_CBC_NO_PADDING) ) ) #define BUILTIN_ALG_CBC_NO_PADDING 1 #endif #if ( defined(MBEDTLS_PSA_BUILTIN_ALG_CBC_PKCS7) || \ ( defined(PSA_CRYPTO_DRIVER_TEST) && \ defined(MBEDTLS_PSA_ACCEL_ALG_CBC_PKCS7) ) ) #define BUILTIN_ALG_CBC_PKCS7 1 #endif #if ( defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_CHACHA20) || \ ( defined(PSA_CRYPTO_DRIVER_TEST) && \ defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_CHACHA20) ) ) #define BUILTIN_KEY_TYPE_CHACHA20 1 #endif const mbedtls_cipher_info_t *mbedtls_cipher_info_from_psa( psa_algorithm_t alg, psa_key_type_t key_type, size_t key_bits, mbedtls_cipher_id_t* cipher_id ) { mbedtls_cipher_mode_t mode; mbedtls_cipher_id_t cipher_id_tmp; if( PSA_ALG_IS_AEAD( alg ) ) alg = PSA_ALG_AEAD_WITH_SHORTENED_TAG( alg, 0 ); if( PSA_ALG_IS_CIPHER( alg ) || PSA_ALG_IS_AEAD( alg ) ) { switch( alg ) { case PSA_ALG_STREAM_CIPHER: mode = MBEDTLS_MODE_STREAM; break; case PSA_ALG_CTR: mode = MBEDTLS_MODE_CTR; break; case PSA_ALG_CFB: mode = MBEDTLS_MODE_CFB; break; case PSA_ALG_OFB: mode = MBEDTLS_MODE_OFB; break; case PSA_ALG_ECB_NO_PADDING: mode = MBEDTLS_MODE_ECB; break; case PSA_ALG_CBC_NO_PADDING: mode = MBEDTLS_MODE_CBC; break; case PSA_ALG_CBC_PKCS7: mode = MBEDTLS_MODE_CBC; break; case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CCM, 0 ): mode = MBEDTLS_MODE_CCM; break; case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_GCM, 0 ): mode = MBEDTLS_MODE_GCM; break; case PSA_ALG_AEAD_WITH_SHORTENED_TAG( PSA_ALG_CHACHA20_POLY1305, 0 ): mode = MBEDTLS_MODE_CHACHAPOLY; break; default: return( NULL ); } } else if( alg == PSA_ALG_CMAC ) mode = MBEDTLS_MODE_ECB; else return( NULL ); switch( key_type ) { case PSA_KEY_TYPE_AES: cipher_id_tmp = MBEDTLS_CIPHER_ID_AES; break; case PSA_KEY_TYPE_DES: /* key_bits is 64 for Single-DES, 128 for two-key Triple-DES, * and 192 for three-key Triple-DES. */ if( key_bits == 64 ) cipher_id_tmp = MBEDTLS_CIPHER_ID_DES; else cipher_id_tmp = MBEDTLS_CIPHER_ID_3DES; /* mbedtls doesn't recognize two-key Triple-DES as an algorithm, * but two-key Triple-DES is functionally three-key Triple-DES * with K1=K3, so that's how we present it to mbedtls. */ if( key_bits == 128 ) key_bits = 192; break; case PSA_KEY_TYPE_CAMELLIA: cipher_id_tmp = MBEDTLS_CIPHER_ID_CAMELLIA; break; case PSA_KEY_TYPE_CHACHA20: cipher_id_tmp = MBEDTLS_CIPHER_ID_CHACHA20; break; default: return( NULL ); } if( cipher_id != NULL ) *cipher_id = cipher_id_tmp; return( mbedtls_cipher_info_from_values( cipher_id_tmp, (int) key_bits, mode ) ); } #if defined(MBEDTLS_PSA_BUILTIN_CIPHER) || defined(PSA_CRYPTO_DRIVER_TEST) static psa_status_t cipher_setup( mbedtls_psa_cipher_operation_t *operation, const psa_key_attributes_t *attributes, const uint8_t *key_buffer, size_t key_buffer_size, psa_algorithm_t alg, mbedtls_operation_t cipher_operation ) { int ret = 0; size_t key_bits; const mbedtls_cipher_info_t *cipher_info = NULL; psa_key_type_t key_type = attributes->core.type; (void)key_buffer_size; mbedtls_cipher_init( &operation->ctx.cipher ); operation->alg = alg; key_bits = attributes->core.bits; cipher_info = mbedtls_cipher_info_from_psa( alg, key_type, key_bits, NULL ); if( cipher_info == NULL ) return( PSA_ERROR_NOT_SUPPORTED ); ret = mbedtls_cipher_setup( &operation->ctx.cipher, cipher_info ); if( ret != 0 ) goto exit; #if defined(BUILTIN_KEY_TYPE_DES) if( key_type == PSA_KEY_TYPE_DES && key_bits == 128 ) { /* Two-key Triple-DES is 3-key Triple-DES with K1=K3 */ uint8_t keys[24]; memcpy( keys, key_buffer, 16 ); memcpy( keys + 16, key_buffer, 8 ); ret = mbedtls_cipher_setkey( &operation->ctx.cipher, keys, 192, cipher_operation ); } else #endif { ret = mbedtls_cipher_setkey( &operation->ctx.cipher, key_buffer, (int) key_bits, cipher_operation ); } if( ret != 0 ) goto exit; #if defined(BUILTIN_ALG_CBC_NO_PADDING) || \ defined(BUILTIN_ALG_CBC_PKCS7) switch( alg ) { case PSA_ALG_CBC_NO_PADDING: ret = mbedtls_cipher_set_padding_mode( &operation->ctx.cipher, MBEDTLS_PADDING_NONE ); break; case PSA_ALG_CBC_PKCS7: ret = mbedtls_cipher_set_padding_mode( &operation->ctx.cipher, MBEDTLS_PADDING_PKCS7 ); break; default: /* The algorithm doesn't involve padding. */ ret = 0; break; } if( ret != 0 ) goto exit; #endif /* BUILTIN_ALG_CBC_NO_PADDING || BUILTIN_ALG_CBC_PKCS7 */ operation->block_length = ( PSA_ALG_IS_STREAM_CIPHER( alg ) ? 1 : PSA_BLOCK_CIPHER_BLOCK_LENGTH( key_type ) ); operation->iv_length = PSA_CIPHER_IV_LENGTH( key_type, alg ); exit: return( mbedtls_to_psa_error( ret ) ); } static psa_status_t cipher_encrypt_setup( mbedtls_psa_cipher_operation_t *operation, const psa_key_attributes_t *attributes, const uint8_t *key_buffer, size_t key_buffer_size, psa_algorithm_t alg ) { return( cipher_setup( operation, attributes, key_buffer, key_buffer_size, alg, MBEDTLS_ENCRYPT ) ); } static psa_status_t cipher_decrypt_setup( mbedtls_psa_cipher_operation_t *operation, const psa_key_attributes_t *attributes, const uint8_t *key_buffer, size_t key_buffer_size, psa_algorithm_t alg ) { return( cipher_setup( operation, attributes, key_buffer, key_buffer_size, alg, MBEDTLS_DECRYPT ) ); } static psa_status_t cipher_set_iv( mbedtls_psa_cipher_operation_t *operation, const uint8_t *iv, size_t iv_length ) { if( iv_length != operation->iv_length ) return( PSA_ERROR_INVALID_ARGUMENT ); return( mbedtls_to_psa_error( mbedtls_cipher_set_iv( &operation->ctx.cipher, iv, iv_length ) ) ); } /* Process input for which the algorithm is set to ECB mode. This requires * manual processing, since the PSA API is defined as being able to process * arbitrary-length calls to psa_cipher_update() with ECB mode, but the * underlying mbedtls_cipher_update only takes full blocks. */ static psa_status_t psa_cipher_update_ecb( mbedtls_cipher_context_t *ctx, 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; size_t block_size = ctx->cipher_info->block_size; size_t internal_output_length = 0; *output_length = 0; if( input_length == 0 ) { status = PSA_SUCCESS; goto exit; } if( ctx->unprocessed_len > 0 ) { /* Fill up to block size, and run the block if there's a full one. */ size_t bytes_to_copy = block_size - ctx->unprocessed_len; if( input_length < bytes_to_copy ) bytes_to_copy = input_length; memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ), input, bytes_to_copy ); input_length -= bytes_to_copy; input += bytes_to_copy; ctx->unprocessed_len += bytes_to_copy; if( ctx->unprocessed_len == block_size ) { status = mbedtls_to_psa_error( mbedtls_cipher_update( ctx, ctx->unprocessed_data, block_size, output, &internal_output_length ) ); if( status != PSA_SUCCESS ) goto exit; output += internal_output_length; output_size -= internal_output_length; *output_length += internal_output_length; ctx->unprocessed_len = 0; } } while( input_length >= block_size ) { /* Run all full blocks we have, one by one */ status = mbedtls_to_psa_error( mbedtls_cipher_update( ctx, input, block_size, output, &internal_output_length ) ); if( status != PSA_SUCCESS ) goto exit; input_length -= block_size; input += block_size; output += internal_output_length; output_size -= internal_output_length; *output_length += internal_output_length; } if( input_length > 0 ) { /* Save unprocessed bytes for later processing */ memcpy( &( ctx->unprocessed_data[ctx->unprocessed_len] ), input, input_length ); ctx->unprocessed_len += input_length; } status = PSA_SUCCESS; exit: return( status ); } static psa_status_t cipher_update( mbedtls_psa_cipher_operation_t *operation, 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; size_t expected_output_size; if( ! PSA_ALG_IS_STREAM_CIPHER( operation->alg ) ) { /* Take the unprocessed partial block left over from previous * update calls, if any, plus the input to this call. Remove * the last partial block, if any. You get the data that will be * output in this call. */ expected_output_size = ( 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_size, 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 ); } static psa_status_t 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 ); } static psa_status_t 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 ); } static psa_status_t 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 *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 = cipher_encrypt_setup( &operation, attributes, key_buffer, key_buffer_size, alg ); if( status != PSA_SUCCESS ) goto exit; accumulated_length = 0; if( operation.iv_length > 0 ) { status = cipher_set_iv( &operation, output, operation.iv_length ); if( status != PSA_SUCCESS ) goto exit; accumulated_length = operation.iv_length; } status = cipher_update( &operation, input, input_length, output + operation.iv_length, output_size - operation.iv_length, &olength ); if( status != PSA_SUCCESS ) goto exit; accumulated_length += olength; status = 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 = cipher_abort( &operation ); else cipher_abort( &operation ); return( status ); } static psa_status_t 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 = cipher_decrypt_setup( &operation, attributes, key_buffer, key_buffer_size, alg ); if( status != PSA_SUCCESS ) goto exit; if( operation.iv_length > 0 ) { status = cipher_set_iv( &operation, input, operation.iv_length ); if( status != PSA_SUCCESS ) goto exit; } status = 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 = 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 = cipher_abort( &operation ); else cipher_abort( &operation ); return( status ); } #endif /* MBEDTLS_PSA_BUILTIN_CIPHER || PSA_CRYPTO_DRIVER_TEST */ #if defined(MBEDTLS_PSA_BUILTIN_CIPHER) psa_status_t mbedtls_psa_cipher_encrypt_setup( mbedtls_psa_cipher_operation_t *operation, const psa_key_attributes_t *attributes, const uint8_t *key_buffer, size_t key_buffer_size, psa_algorithm_t alg ) { return( cipher_encrypt_setup( operation, attributes, key_buffer, key_buffer_size, alg ) ); } psa_status_t mbedtls_psa_cipher_decrypt_setup( mbedtls_psa_cipher_operation_t *operation, const psa_key_attributes_t *attributes, const uint8_t *key_buffer, size_t key_buffer_size, psa_algorithm_t alg ) { return( cipher_decrypt_setup( operation, attributes, key_buffer, key_buffer_size, alg ) ); } psa_status_t mbedtls_psa_cipher_set_iv( mbedtls_psa_cipher_operation_t *operation, const uint8_t *iv, size_t iv_length ) { return( cipher_set_iv( operation, iv, iv_length ) ); } psa_status_t mbedtls_psa_cipher_update( mbedtls_psa_cipher_operation_t *operation, const uint8_t *input, size_t input_length, uint8_t *output, size_t output_size, size_t *output_length ) { return( cipher_update( operation, input, input_length, output, output_size, output_length ) ); } psa_status_t mbedtls_psa_cipher_finish( mbedtls_psa_cipher_operation_t *operation, uint8_t *output, size_t output_size, size_t *output_length ) { return( cipher_finish( operation, output, output_size, output_length ) ); } psa_status_t mbedtls_psa_cipher_abort( mbedtls_psa_cipher_operation_t *operation ) { return( cipher_abort( operation ) ); } 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 *input, size_t input_length, uint8_t *output, size_t output_size, size_t *output_length ) { return( cipher_encrypt( attributes, key_buffer, key_buffer_size, alg, input, input_length, output, output_size, output_length ) ); } 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 ) { return( cipher_decrypt( attributes, key_buffer, key_buffer_size, alg, input, input_length, output, output_size, output_length ) ); } #endif /* MBEDTLS_PSA_BUILTIN_CIPHER */ /* * BEYOND THIS POINT, TEST DRIVER ENTRY POINTS ONLY. */ #if defined(PSA_CRYPTO_DRIVER_TEST) psa_status_t mbedtls_transparent_test_driver_cipher_encrypt_setup( mbedtls_psa_cipher_operation_t *operation, const psa_key_attributes_t *attributes, const uint8_t *key_buffer, size_t key_buffer_size, psa_algorithm_t alg ) { return( cipher_encrypt_setup( operation, attributes, key_buffer, key_buffer_size, alg ) ); } psa_status_t mbedtls_transparent_test_driver_cipher_decrypt_setup( mbedtls_psa_cipher_operation_t *operation, const psa_key_attributes_t *attributes, const uint8_t *key_buffer, size_t key_buffer_size, psa_algorithm_t alg ) { return( cipher_decrypt_setup( operation, attributes, key_buffer, key_buffer_size, alg ) ); } psa_status_t mbedtls_transparent_test_driver_cipher_set_iv( mbedtls_psa_cipher_operation_t *operation, const uint8_t *iv, size_t iv_length ) { return( cipher_set_iv( operation, iv, iv_length ) ); } psa_status_t mbedtls_transparent_test_driver_cipher_update( mbedtls_psa_cipher_operation_t *operation, const uint8_t *input, size_t input_length, uint8_t *output, size_t output_size, size_t *output_length ) { return( cipher_update( operation, input, input_length, output, output_size, output_length ) ); } psa_status_t mbedtls_transparent_test_driver_cipher_finish( mbedtls_psa_cipher_operation_t *operation, uint8_t *output, size_t output_size, size_t *output_length ) { return( cipher_finish( operation, output, output_size, output_length ) ); } psa_status_t mbedtls_transparent_test_driver_cipher_abort( mbedtls_psa_cipher_operation_t *operation ) { return( cipher_abort( operation ) ); } psa_status_t mbedtls_transparent_test_driver_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 *input, size_t input_length, uint8_t *output, size_t output_size, size_t *output_length ) { return( cipher_encrypt( attributes, key_buffer, key_buffer_size, alg, input, input_length, output, output_size, output_length ) ); } psa_status_t mbedtls_transparent_test_driver_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 ) { return( cipher_decrypt( attributes, key_buffer, key_buffer_size, alg, input, input_length, output, output_size, output_length ) ); } #endif /* PSA_CRYPTO_DRIVER_TEST */ #endif /* MBEDTLS_PSA_CRYPTO_C */