/* * PSA crypto layer on top of Mbed TLS crypto */ /* Copyright (C) 2018, ARM Limited, All Rights Reserved * 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. * * This file is part of mbed TLS (https://tls.mbed.org) */ #if !defined(MBEDTLS_CONFIG_FILE) #include "mbedtls/config.h" #else #include MBEDTLS_CONFIG_FILE #endif #if defined(MBEDTLS_PSA_CRYPTO_C) #include "psa/crypto.h" #include #include #if defined(MBEDTLS_PLATFORM_C) #include "mbedtls/platform.h" #else #define mbedtls_calloc calloc #define mbedtls_free free #endif #include "mbedtls/arc4.h" #include "mbedtls/blowfish.h" #include "mbedtls/camellia.h" #include "mbedtls/cipher.h" #include "mbedtls/ccm.h" #include "mbedtls/cmac.h" #include "mbedtls/ctr_drbg.h" #include "mbedtls/des.h" #include "mbedtls/ecp.h" #include "mbedtls/entropy.h" #include "mbedtls/error.h" #include "mbedtls/gcm.h" #include "mbedtls/md2.h" #include "mbedtls/md4.h" #include "mbedtls/md5.h" #include "mbedtls/md.h" #include "mbedtls/md_internal.h" #include "mbedtls/pk.h" #include "mbedtls/pk_internal.h" #include "mbedtls/ripemd160.h" #include "mbedtls/rsa.h" #include "mbedtls/sha1.h" #include "mbedtls/sha256.h" #include "mbedtls/sha512.h" #include "mbedtls/xtea.h" /* Implementation that should never be optimized out by the compiler */ static void mbedtls_zeroize( void *v, size_t n ) { volatile unsigned char *p = v; while( n-- ) *p++ = 0; } /* constant-time buffer comparison */ static inline int safer_memcmp( const uint8_t *a, const uint8_t *b, size_t n ) { size_t i; unsigned char diff = 0; for( i = 0; i < n; i++ ) diff |= a[i] ^ b[i]; return( diff ); } /****************************************************************/ /* Global data, support functions and library management */ /****************************************************************/ /* Number of key slots (plus one because 0 is not used). * The value is a compile-time constant for now, for simplicity. */ #define MBEDTLS_PSA_KEY_SLOT_COUNT 32 typedef struct { psa_key_type_t type; psa_key_policy_t policy; psa_key_lifetime_t lifetime; union { struct raw_data { uint8_t *data; size_t bytes; } raw; #if defined(MBEDTLS_RSA_C) mbedtls_rsa_context *rsa; #endif /* MBEDTLS_RSA_C */ #if defined(MBEDTLS_ECP_C) mbedtls_ecp_keypair *ecp; #endif /* MBEDTLS_ECP_C */ } data; } key_slot_t; typedef struct { int initialized; mbedtls_entropy_context entropy; mbedtls_ctr_drbg_context ctr_drbg; key_slot_t key_slots[MBEDTLS_PSA_KEY_SLOT_COUNT]; } psa_global_data_t; static psa_global_data_t global_data; static psa_status_t mbedtls_to_psa_error( int ret ) { /* If there's both a high-level code and low-level code, dispatch on * the high-level code. */ switch( ret < -0x7f ? - ( -ret & 0x7f80 ) : ret ) { case 0: return( PSA_SUCCESS ); case MBEDTLS_ERR_AES_INVALID_KEY_LENGTH: case MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH: case MBEDTLS_ERR_AES_FEATURE_UNAVAILABLE: return( PSA_ERROR_NOT_SUPPORTED ); case MBEDTLS_ERR_AES_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_ARC4_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_BLOWFISH_INVALID_KEY_LENGTH: case MBEDTLS_ERR_BLOWFISH_INVALID_INPUT_LENGTH: return( PSA_ERROR_NOT_SUPPORTED ); case MBEDTLS_ERR_BLOWFISH_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_CAMELLIA_INVALID_KEY_LENGTH: case MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH: return( PSA_ERROR_NOT_SUPPORTED ); case MBEDTLS_ERR_CAMELLIA_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_CCM_BAD_INPUT: return( PSA_ERROR_INVALID_ARGUMENT ); case MBEDTLS_ERR_CCM_AUTH_FAILED: return( PSA_ERROR_INVALID_SIGNATURE ); case MBEDTLS_ERR_CCM_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE: return( PSA_ERROR_NOT_SUPPORTED ); case MBEDTLS_ERR_CIPHER_BAD_INPUT_DATA: return( PSA_ERROR_INVALID_ARGUMENT ); case MBEDTLS_ERR_CIPHER_ALLOC_FAILED: return( PSA_ERROR_INSUFFICIENT_MEMORY ); case MBEDTLS_ERR_CIPHER_INVALID_PADDING: return( PSA_ERROR_INVALID_PADDING ); case MBEDTLS_ERR_CIPHER_FULL_BLOCK_EXPECTED: return( PSA_ERROR_BAD_STATE ); case MBEDTLS_ERR_CIPHER_AUTH_FAILED: return( PSA_ERROR_INVALID_SIGNATURE ); case MBEDTLS_ERR_CIPHER_INVALID_CONTEXT: return( PSA_ERROR_TAMPERING_DETECTED ); case MBEDTLS_ERR_CIPHER_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_CMAC_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_CTR_DRBG_ENTROPY_SOURCE_FAILED: return( PSA_ERROR_INSUFFICIENT_ENTROPY ); case MBEDTLS_ERR_CTR_DRBG_REQUEST_TOO_BIG: case MBEDTLS_ERR_CTR_DRBG_INPUT_TOO_BIG: return( PSA_ERROR_NOT_SUPPORTED ); case MBEDTLS_ERR_CTR_DRBG_FILE_IO_ERROR: return( PSA_ERROR_INSUFFICIENT_ENTROPY ); case MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH: return( PSA_ERROR_NOT_SUPPORTED ); case MBEDTLS_ERR_DES_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_ENTROPY_NO_SOURCES_DEFINED: case MBEDTLS_ERR_ENTROPY_NO_STRONG_SOURCE: case MBEDTLS_ERR_ENTROPY_SOURCE_FAILED: return( PSA_ERROR_INSUFFICIENT_ENTROPY ); case MBEDTLS_ERR_GCM_AUTH_FAILED: return( PSA_ERROR_INVALID_SIGNATURE ); case MBEDTLS_ERR_GCM_BAD_INPUT: return( PSA_ERROR_NOT_SUPPORTED ); case MBEDTLS_ERR_GCM_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_MD2_HW_ACCEL_FAILED: case MBEDTLS_ERR_MD4_HW_ACCEL_FAILED: case MBEDTLS_ERR_MD5_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_MD_FEATURE_UNAVAILABLE: return( PSA_ERROR_NOT_SUPPORTED ); case MBEDTLS_ERR_MD_BAD_INPUT_DATA: return( PSA_ERROR_INVALID_ARGUMENT ); case MBEDTLS_ERR_MD_ALLOC_FAILED: return( PSA_ERROR_INSUFFICIENT_MEMORY ); case MBEDTLS_ERR_MD_FILE_IO_ERROR: return( PSA_ERROR_STORAGE_FAILURE ); case MBEDTLS_ERR_MD_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_PK_ALLOC_FAILED: return( PSA_ERROR_INSUFFICIENT_MEMORY ); case MBEDTLS_ERR_PK_TYPE_MISMATCH: case MBEDTLS_ERR_PK_BAD_INPUT_DATA: return( PSA_ERROR_INVALID_ARGUMENT ); case MBEDTLS_ERR_PK_FILE_IO_ERROR: return( PSA_ERROR_STORAGE_FAILURE ); case MBEDTLS_ERR_PK_KEY_INVALID_VERSION: case MBEDTLS_ERR_PK_KEY_INVALID_FORMAT: return( PSA_ERROR_INVALID_ARGUMENT ); case MBEDTLS_ERR_PK_UNKNOWN_PK_ALG: return( PSA_ERROR_NOT_SUPPORTED ); case MBEDTLS_ERR_PK_PASSWORD_REQUIRED: case MBEDTLS_ERR_PK_PASSWORD_MISMATCH: return( PSA_ERROR_NOT_PERMITTED ); case MBEDTLS_ERR_PK_INVALID_PUBKEY: return( PSA_ERROR_INVALID_ARGUMENT ); case MBEDTLS_ERR_PK_INVALID_ALG: case MBEDTLS_ERR_PK_UNKNOWN_NAMED_CURVE: case MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE: return( PSA_ERROR_NOT_SUPPORTED ); case MBEDTLS_ERR_PK_SIG_LEN_MISMATCH: return( PSA_ERROR_INVALID_SIGNATURE ); case MBEDTLS_ERR_PK_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_RIPEMD160_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_RSA_BAD_INPUT_DATA: return( PSA_ERROR_INVALID_ARGUMENT ); case MBEDTLS_ERR_RSA_INVALID_PADDING: return( PSA_ERROR_INVALID_PADDING ); case MBEDTLS_ERR_RSA_KEY_GEN_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_RSA_KEY_CHECK_FAILED: return( PSA_ERROR_INVALID_ARGUMENT ); case MBEDTLS_ERR_RSA_PUBLIC_FAILED: case MBEDTLS_ERR_RSA_PRIVATE_FAILED: return( PSA_ERROR_TAMPERING_DETECTED ); case MBEDTLS_ERR_RSA_VERIFY_FAILED: return( PSA_ERROR_INVALID_SIGNATURE ); case MBEDTLS_ERR_RSA_OUTPUT_TOO_LARGE: return( PSA_ERROR_BUFFER_TOO_SMALL ); case MBEDTLS_ERR_RSA_RNG_FAILED: return( PSA_ERROR_INSUFFICIENT_MEMORY ); case MBEDTLS_ERR_RSA_UNSUPPORTED_OPERATION: return( PSA_ERROR_NOT_SUPPORTED ); case MBEDTLS_ERR_RSA_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_SHA1_HW_ACCEL_FAILED: case MBEDTLS_ERR_SHA256_HW_ACCEL_FAILED: case MBEDTLS_ERR_SHA512_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_XTEA_INVALID_INPUT_LENGTH: return( PSA_ERROR_INVALID_ARGUMENT ); case MBEDTLS_ERR_XTEA_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); case MBEDTLS_ERR_ECP_BAD_INPUT_DATA: case MBEDTLS_ERR_ECP_INVALID_KEY: return( PSA_ERROR_INVALID_ARGUMENT ); case MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL: return( PSA_ERROR_BUFFER_TOO_SMALL ); case MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE: return( PSA_ERROR_NOT_SUPPORTED ); case MBEDTLS_ERR_ECP_SIG_LEN_MISMATCH: case MBEDTLS_ERR_ECP_VERIFY_FAILED: return( PSA_ERROR_INVALID_SIGNATURE ); case MBEDTLS_ERR_ECP_ALLOC_FAILED: return( PSA_ERROR_INSUFFICIENT_MEMORY ); case MBEDTLS_ERR_ECP_HW_ACCEL_FAILED: return( PSA_ERROR_HARDWARE_FAILURE ); default: return( PSA_ERROR_UNKNOWN_ERROR ); } } /****************************************************************/ /* Key management */ /****************************************************************/ psa_status_t psa_import_key(psa_key_slot_t key, psa_key_type_t type, const uint8_t *data, size_t data_length) { key_slot_t *slot; if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT ) return( PSA_ERROR_INVALID_ARGUMENT ); slot = &global_data.key_slots[key]; if( slot->type != PSA_KEY_TYPE_NONE ) return( PSA_ERROR_OCCUPIED_SLOT ); if( PSA_KEY_TYPE_IS_RAW_BYTES( type ) ) { /* Ensure that a bytes-to-bit conversion won't overflow. */ if( data_length > SIZE_MAX / 8 ) return( PSA_ERROR_NOT_SUPPORTED ); slot->data.raw.data = mbedtls_calloc( 1, data_length ); if( slot->data.raw.data == NULL ) return( PSA_ERROR_INSUFFICIENT_MEMORY ); memcpy( slot->data.raw.data, data, data_length ); slot->data.raw.bytes = data_length; } else #if defined(MBEDTLS_PK_PARSE_C) if( type == PSA_KEY_TYPE_RSA_PUBLIC_KEY || type == PSA_KEY_TYPE_RSA_KEYPAIR || PSA_KEY_TYPE_IS_ECC( type ) ) { int ret; mbedtls_pk_context pk; mbedtls_pk_init( &pk ); if( PSA_KEY_TYPE_IS_KEYPAIR( type ) ) ret = mbedtls_pk_parse_key( &pk, data, data_length, NULL, 0 ); else ret = mbedtls_pk_parse_public_key( &pk, data, data_length ); if( ret != 0 ) return( mbedtls_to_psa_error( ret ) ); switch( mbedtls_pk_get_type( &pk ) ) { #if defined(MBEDTLS_RSA_C) case MBEDTLS_PK_RSA: if( type == PSA_KEY_TYPE_RSA_PUBLIC_KEY || type == PSA_KEY_TYPE_RSA_KEYPAIR ) slot->data.rsa = pk.pk_ctx; else return( PSA_ERROR_INVALID_ARGUMENT ); break; #endif /* MBEDTLS_RSA_C */ #if defined(MBEDTLS_ECP_C) case MBEDTLS_PK_ECKEY: if( PSA_KEY_TYPE_IS_ECC( type ) ) { // TODO: check curve slot->data.ecp = pk.pk_ctx; } else return( PSA_ERROR_INVALID_ARGUMENT ); break; #endif /* MBEDTLS_ECP_C */ default: return( PSA_ERROR_INVALID_ARGUMENT ); } } else #endif /* defined(MBEDTLS_PK_PARSE_C) */ { return( PSA_ERROR_NOT_SUPPORTED ); } slot->type = type; return( PSA_SUCCESS ); } psa_status_t psa_destroy_key(psa_key_slot_t key) { key_slot_t *slot; if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT ) return( PSA_ERROR_INVALID_ARGUMENT ); slot = &global_data.key_slots[key]; if( slot->type == PSA_KEY_TYPE_NONE ) { /* No key material to clean, but do zeroize the slot below to wipe * metadata such as policies. */ } else if( PSA_KEY_TYPE_IS_RAW_BYTES( slot->type ) ) { mbedtls_free( slot->data.raw.data ); } else #if defined(MBEDTLS_RSA_C) if( slot->type == PSA_KEY_TYPE_RSA_PUBLIC_KEY || slot->type == PSA_KEY_TYPE_RSA_KEYPAIR ) { mbedtls_rsa_free( slot->data.rsa ); mbedtls_free( slot->data.rsa ); } else #endif /* defined(MBEDTLS_RSA_C) */ #if defined(MBEDTLS_ECP_C) if( PSA_KEY_TYPE_IS_ECC( slot->type ) ) { mbedtls_ecp_keypair_free( slot->data.ecp ); mbedtls_free( slot->data.ecp ); } else #endif /* defined(MBEDTLS_ECP_C) */ { /* Shouldn't happen: the key type is not any type that we * put in. */ return( PSA_ERROR_TAMPERING_DETECTED ); } mbedtls_zeroize( slot, sizeof( *slot ) ); return( PSA_SUCCESS ); } psa_status_t psa_get_key_information(psa_key_slot_t key, psa_key_type_t *type, size_t *bits) { key_slot_t *slot; if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT ) return( PSA_ERROR_EMPTY_SLOT ); slot = &global_data.key_slots[key]; if( type != NULL ) *type = slot->type; if( bits != NULL ) *bits = 0; if( slot->type == PSA_KEY_TYPE_NONE ) return( PSA_ERROR_EMPTY_SLOT ); if( PSA_KEY_TYPE_IS_RAW_BYTES( slot->type ) ) { if( bits != NULL ) *bits = slot->data.raw.bytes * 8; } else #if defined(MBEDTLS_RSA_C) if( slot->type == PSA_KEY_TYPE_RSA_PUBLIC_KEY || slot->type == PSA_KEY_TYPE_RSA_KEYPAIR ) { if( bits != NULL ) *bits = mbedtls_rsa_get_bitlen( slot->data.rsa ); } else #endif /* defined(MBEDTLS_RSA_C) */ #if defined(MBEDTLS_ECP_C) if( PSA_KEY_TYPE_IS_ECC( slot->type ) ) { if( bits != NULL ) *bits = slot->data.ecp->grp.pbits; } else #endif /* defined(MBEDTLS_ECP_C) */ { /* Shouldn't happen: the key type is not any type that we * put in. */ return( PSA_ERROR_TAMPERING_DETECTED ); } return( PSA_SUCCESS ); } static psa_status_t psa_internal_export_key(psa_key_slot_t key, uint8_t *data, size_t data_size, size_t *data_length, int export_public_key) { key_slot_t *slot; if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT ) return( PSA_ERROR_EMPTY_SLOT ); slot = &global_data.key_slots[key]; if( slot->type == PSA_KEY_TYPE_NONE ) return( PSA_ERROR_EMPTY_SLOT ); if( export_public_key && ( !( PSA_KEY_TYPE_IS_ASYMMETRIC( slot->type ) ) ) ) return( PSA_ERROR_INVALID_ARGUMENT ); if( ( !export_public_key ) && ( !( PSA_KEY_TYPE_IS_PUBLIC_KEY( slot->type ) ) ) && ( !( slot->policy.usage & PSA_KEY_USAGE_EXPORT ) ) ) return( PSA_ERROR_NOT_PERMITTED ); if( PSA_KEY_TYPE_IS_RAW_BYTES( slot->type ) ) { if( slot->data.raw.bytes > data_size ) return( PSA_ERROR_BUFFER_TOO_SMALL ); memcpy( data, slot->data.raw.data, slot->data.raw.bytes ); *data_length = slot->data.raw.bytes; return( PSA_SUCCESS ); } else { #if defined(MBEDTLS_PK_WRITE_C) if( slot->type == PSA_KEY_TYPE_RSA_PUBLIC_KEY || slot->type == PSA_KEY_TYPE_RSA_KEYPAIR || PSA_KEY_TYPE_IS_ECC( slot->type ) ) { mbedtls_pk_context pk; int ret; mbedtls_pk_init( &pk ); if( slot->type == PSA_KEY_TYPE_RSA_PUBLIC_KEY || slot->type == PSA_KEY_TYPE_RSA_KEYPAIR ) { pk.pk_info = &mbedtls_rsa_info; pk.pk_ctx = slot->data.rsa; } else { pk.pk_info = &mbedtls_eckey_info; pk.pk_ctx = slot->data.ecp; } if( export_public_key || PSA_KEY_TYPE_IS_PUBLIC_KEY( slot->type ) ) ret = mbedtls_pk_write_pubkey_der( &pk, data, data_size ); else ret = mbedtls_pk_write_key_der( &pk, data, data_size ); if( ret < 0 ) return( mbedtls_to_psa_error( ret ) ); *data_length = ret; return( PSA_SUCCESS ); } else #endif /* defined(MBEDTLS_PK_WRITE_C) */ { /* This shouldn't happen in the reference implementation, but it is valid for a special-purpose implementation to omit support for exporting certain key types. */ return( PSA_ERROR_NOT_SUPPORTED ); } } } psa_status_t psa_export_key(psa_key_slot_t key, uint8_t *data, size_t data_size, size_t *data_length) { return psa_internal_export_key( key, data, data_size, data_length, 0 ); } psa_status_t psa_export_public_key(psa_key_slot_t key, uint8_t *data, size_t data_size, size_t *data_length) { return psa_internal_export_key( key, data, data_size, data_length, 1 ); } /****************************************************************/ /* Message digests */ /****************************************************************/ static const mbedtls_md_info_t *mbedtls_md_info_from_psa( psa_algorithm_t alg ) { switch( alg ) { #if defined(MBEDTLS_MD2_C) case PSA_ALG_MD2: return( &mbedtls_md2_info ); #endif #if defined(MBEDTLS_MD4_C) case PSA_ALG_MD4: return( &mbedtls_md4_info ); #endif #if defined(MBEDTLS_MD5_C) case PSA_ALG_MD5: return( &mbedtls_md5_info ); #endif #if defined(MBEDTLS_RIPEMD160_C) case PSA_ALG_RIPEMD160: return( &mbedtls_ripemd160_info ); #endif #if defined(MBEDTLS_SHA1_C) case PSA_ALG_SHA_1: return( &mbedtls_sha1_info ); #endif #if defined(MBEDTLS_SHA256_C) case PSA_ALG_SHA_224: return( &mbedtls_sha224_info ); case PSA_ALG_SHA_256: return( &mbedtls_sha256_info ); #endif #if defined(MBEDTLS_SHA512_C) case PSA_ALG_SHA_384: return( &mbedtls_sha384_info ); case PSA_ALG_SHA_512: return( &mbedtls_sha512_info ); #endif default: return( NULL ); } } #if 0 static psa_algorithm_t mbedtls_md_alg_to_psa( mbedtls_md_type_t md_alg ) { switch( md_alg ) { case MBEDTLS_MD_NONE: return( 0 ); case MBEDTLS_MD_MD2: return( PSA_ALG_MD2 ); case MBEDTLS_MD_MD4: return( PSA_ALG_MD4 ); case MBEDTLS_MD_MD5: return( PSA_ALG_MD5 ); case MBEDTLS_MD_SHA1: return( PSA_ALG_SHA_1 ); case MBEDTLS_MD_SHA224: return( PSA_ALG_SHA_224 ); case MBEDTLS_MD_SHA256: return( PSA_ALG_SHA_256 ); case MBEDTLS_MD_SHA384: return( PSA_ALG_SHA_384 ); case MBEDTLS_MD_SHA512: return( PSA_ALG_SHA_512 ); case MBEDTLS_MD_RIPEMD160: return( PSA_ALG_RIPEMD160 ); default: return( 0 ); } } #endif psa_status_t psa_hash_abort( psa_hash_operation_t *operation ) { switch( operation->alg ) { #if defined(MBEDTLS_MD2_C) case PSA_ALG_MD2: mbedtls_md2_free( &operation->ctx.md2 ); break; #endif #if defined(MBEDTLS_MD4_C) case PSA_ALG_MD4: mbedtls_md4_free( &operation->ctx.md4 ); break; #endif #if defined(MBEDTLS_MD5_C) case PSA_ALG_MD5: mbedtls_md5_free( &operation->ctx.md5 ); break; #endif #if defined(MBEDTLS_RIPEMD160_C) case PSA_ALG_RIPEMD160: mbedtls_ripemd160_free( &operation->ctx.ripemd160 ); break; #endif #if defined(MBEDTLS_SHA1_C) case PSA_ALG_SHA_1: mbedtls_sha1_free( &operation->ctx.sha1 ); break; #endif #if defined(MBEDTLS_SHA256_C) case PSA_ALG_SHA_224: case PSA_ALG_SHA_256: mbedtls_sha256_free( &operation->ctx.sha256 ); break; #endif #if defined(MBEDTLS_SHA512_C) case PSA_ALG_SHA_384: case PSA_ALG_SHA_512: mbedtls_sha512_free( &operation->ctx.sha512 ); break; #endif default: return( PSA_ERROR_NOT_SUPPORTED ); } operation->alg = 0; return( PSA_SUCCESS ); } psa_status_t psa_hash_start( psa_hash_operation_t *operation, psa_algorithm_t alg ) { int ret; operation->alg = 0; switch( alg ) { #if defined(MBEDTLS_MD2_C) case PSA_ALG_MD2: mbedtls_md2_init( &operation->ctx.md2 ); ret = mbedtls_md2_starts_ret( &operation->ctx.md2 ); break; #endif #if defined(MBEDTLS_MD4_C) case PSA_ALG_MD4: mbedtls_md4_init( &operation->ctx.md4 ); ret = mbedtls_md4_starts_ret( &operation->ctx.md4 ); break; #endif #if defined(MBEDTLS_MD5_C) case PSA_ALG_MD5: mbedtls_md5_init( &operation->ctx.md5 ); ret = mbedtls_md5_starts_ret( &operation->ctx.md5 ); break; #endif #if defined(MBEDTLS_RIPEMD160_C) case PSA_ALG_RIPEMD160: mbedtls_ripemd160_init( &operation->ctx.ripemd160 ); ret = mbedtls_ripemd160_starts_ret( &operation->ctx.ripemd160 ); break; #endif #if defined(MBEDTLS_SHA1_C) case PSA_ALG_SHA_1: mbedtls_sha1_init( &operation->ctx.sha1 ); ret = mbedtls_sha1_starts_ret( &operation->ctx.sha1 ); break; #endif #if defined(MBEDTLS_SHA256_C) case PSA_ALG_SHA_224: mbedtls_sha256_init( &operation->ctx.sha256 ); ret = mbedtls_sha256_starts_ret( &operation->ctx.sha256, 1 ); break; case PSA_ALG_SHA_256: mbedtls_sha256_init( &operation->ctx.sha256 ); ret = mbedtls_sha256_starts_ret( &operation->ctx.sha256, 0 ); break; #endif #if defined(MBEDTLS_SHA512_C) case PSA_ALG_SHA_384: mbedtls_sha512_init( &operation->ctx.sha512 ); ret = mbedtls_sha512_starts_ret( &operation->ctx.sha512, 1 ); break; case PSA_ALG_SHA_512: mbedtls_sha512_init( &operation->ctx.sha512 ); ret = mbedtls_sha512_starts_ret( &operation->ctx.sha512, 0 ); break; #endif default: return( PSA_ERROR_NOT_SUPPORTED ); } if( ret == 0 ) operation->alg = alg; else psa_hash_abort( operation ); return( mbedtls_to_psa_error( ret ) ); } psa_status_t psa_hash_update( psa_hash_operation_t *operation, const uint8_t *input, size_t input_length ) { int ret; switch( operation->alg ) { #if defined(MBEDTLS_MD2_C) case PSA_ALG_MD2: ret = mbedtls_md2_update_ret( &operation->ctx.md2, input, input_length ); break; #endif #if defined(MBEDTLS_MD4_C) case PSA_ALG_MD4: ret = mbedtls_md4_update_ret( &operation->ctx.md4, input, input_length ); break; #endif #if defined(MBEDTLS_MD5_C) case PSA_ALG_MD5: ret = mbedtls_md5_update_ret( &operation->ctx.md5, input, input_length ); break; #endif #if defined(MBEDTLS_RIPEMD160_C) case PSA_ALG_RIPEMD160: ret = mbedtls_ripemd160_update_ret( &operation->ctx.ripemd160, input, input_length ); break; #endif #if defined(MBEDTLS_SHA1_C) case PSA_ALG_SHA_1: ret = mbedtls_sha1_update_ret( &operation->ctx.sha1, input, input_length ); break; #endif #if defined(MBEDTLS_SHA256_C) case PSA_ALG_SHA_224: case PSA_ALG_SHA_256: ret = mbedtls_sha256_update_ret( &operation->ctx.sha256, input, input_length ); break; #endif #if defined(MBEDTLS_SHA512_C) case PSA_ALG_SHA_384: case PSA_ALG_SHA_512: ret = mbedtls_sha512_update_ret( &operation->ctx.sha512, input, input_length ); break; #endif default: ret = MBEDTLS_ERR_MD_BAD_INPUT_DATA; break; } if( ret != 0 ) psa_hash_abort( operation ); return( mbedtls_to_psa_error( ret ) ); } psa_status_t psa_hash_finish( psa_hash_operation_t *operation, uint8_t *hash, size_t hash_size, size_t *hash_length ) { int ret; size_t actual_hash_length = PSA_HASH_SIZE( operation->alg ); /* Fill the output buffer with something that isn't a valid hash * (barring an attack on the hash and deliberately-crafted input), * in case the caller doesn't check the return status properly. */ *hash_length = actual_hash_length; memset( hash, '!', hash_size ); if( hash_size < actual_hash_length ) return( PSA_ERROR_BUFFER_TOO_SMALL ); switch( operation->alg ) { #if defined(MBEDTLS_MD2_C) case PSA_ALG_MD2: ret = mbedtls_md2_finish_ret( &operation->ctx.md2, hash ); break; #endif #if defined(MBEDTLS_MD4_C) case PSA_ALG_MD4: ret = mbedtls_md4_finish_ret( &operation->ctx.md4, hash ); break; #endif #if defined(MBEDTLS_MD5_C) case PSA_ALG_MD5: ret = mbedtls_md5_finish_ret( &operation->ctx.md5, hash ); break; #endif #if defined(MBEDTLS_RIPEMD160_C) case PSA_ALG_RIPEMD160: ret = mbedtls_ripemd160_finish_ret( &operation->ctx.ripemd160, hash ); break; #endif #if defined(MBEDTLS_SHA1_C) case PSA_ALG_SHA_1: ret = mbedtls_sha1_finish_ret( &operation->ctx.sha1, hash ); break; #endif #if defined(MBEDTLS_SHA256_C) case PSA_ALG_SHA_224: case PSA_ALG_SHA_256: ret = mbedtls_sha256_finish_ret( &operation->ctx.sha256, hash ); break; #endif #if defined(MBEDTLS_SHA512_C) case PSA_ALG_SHA_384: case PSA_ALG_SHA_512: ret = mbedtls_sha512_finish_ret( &operation->ctx.sha512, hash ); break; #endif default: ret = MBEDTLS_ERR_MD_BAD_INPUT_DATA; break; } if( ret == 0 ) { return( psa_hash_abort( operation ) ); } else { psa_hash_abort( operation ); return( mbedtls_to_psa_error( ret ) ); } } psa_status_t psa_hash_verify(psa_hash_operation_t *operation, const uint8_t *hash, size_t hash_length) { uint8_t actual_hash[MBEDTLS_MD_MAX_SIZE]; size_t actual_hash_length; psa_status_t status = psa_hash_finish( operation, actual_hash, sizeof( actual_hash ), &actual_hash_length ); if( status != PSA_SUCCESS ) return( status ); if( actual_hash_length != hash_length ) return( PSA_ERROR_INVALID_SIGNATURE ); if( safer_memcmp( hash, actual_hash, actual_hash_length ) != 0 ) return( PSA_ERROR_INVALID_SIGNATURE ); return( PSA_SUCCESS ); } /****************************************************************/ /* MAC */ /****************************************************************/ static 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_CIPHER( alg ) || PSA_ALG_IS_AEAD( alg ) ) { if( PSA_ALG_IS_BLOCK_CIPHER( alg ) ) { alg &= ~PSA_ALG_BLOCK_CIPHER_PADDING_MASK; } switch( alg ) { case PSA_ALG_STREAM_CIPHER: mode = MBEDTLS_MODE_STREAM; break; case PSA_ALG_CBC_BASE: mode = MBEDTLS_MODE_CBC; break; case PSA_ALG_CFB_BASE: mode = MBEDTLS_MODE_CFB; break; case PSA_ALG_OFB_BASE: mode = MBEDTLS_MODE_OFB; break; case PSA_ALG_CTR: mode = MBEDTLS_MODE_CTR; break; case PSA_ALG_CCM: mode = MBEDTLS_MODE_CCM; break; case PSA_ALG_GCM: mode = MBEDTLS_MODE_GCM; break; default: return( NULL ); } } else if( alg == PSA_ALG_CMAC ) mode = MBEDTLS_MODE_ECB; else if( alg == PSA_ALG_GMAC ) mode = MBEDTLS_MODE_GCM; else return( NULL ); switch( key_type ) { case PSA_KEY_TYPE_AES: cipher_id_tmp = MBEDTLS_CIPHER_ID_AES; break; case PSA_KEY_TYPE_DES: if( key_bits == 64 ) cipher_id_tmp = MBEDTLS_CIPHER_ID_DES; else cipher_id_tmp = MBEDTLS_CIPHER_ID_3DES; break; case PSA_KEY_TYPE_CAMELLIA: cipher_id_tmp = MBEDTLS_CIPHER_ID_CAMELLIA; break; case PSA_KEY_TYPE_ARC4: cipher_id_tmp = MBEDTLS_CIPHER_ID_ARC4; break; default: return( NULL ); } if( cipher_id != NULL ) *cipher_id = cipher_id_tmp; return( mbedtls_cipher_info_from_values( cipher_id_tmp, key_bits, mode ) ); } static size_t psa_get_hash_block_size(psa_algorithm_t alg) { switch(alg) { case PSA_ALG_MD2: return 16; case PSA_ALG_MD4: return 64; case PSA_ALG_MD5: return 64; case PSA_ALG_RIPEMD160: return 64; case PSA_ALG_SHA_1: return 64; case PSA_ALG_SHA_224: return 64; case PSA_ALG_SHA_256: return 64; case PSA_ALG_SHA_384: return 128; case PSA_ALG_SHA_512: return 128; default: return 0; } } psa_status_t psa_mac_abort( psa_mac_operation_t *operation ) { switch( operation->alg ) { #if defined(MBEDTLS_CMAC_C) case PSA_ALG_CMAC: mbedtls_cipher_free( &operation->ctx.cmac ); break; #endif /* MBEDTLS_CMAC_C */ default: #if defined(MBEDTLS_MD_C) if( PSA_ALG_IS_HMAC( operation->alg ) ) { unsigned int block_size = psa_get_hash_block_size( ( PSA_ALG_HMAC_HASH( operation->alg ) ) ); if( block_size == 0 ) return( PSA_ERROR_NOT_SUPPORTED ); psa_hash_abort( &operation->ctx.hmac.hash_ctx ); mbedtls_zeroize( operation->ctx.hmac.opad, block_size); } else #endif /* MBEDTLS_MD_C */ return( PSA_ERROR_NOT_SUPPORTED ); } operation->alg = 0; operation->key_set = 0; operation->iv_set = 0; operation->iv_required = 0; operation->has_input = 0; return( PSA_SUCCESS ); } static int psa_cmac_start( psa_mac_operation_t *operation, size_t key_bits, key_slot_t *slot, const mbedtls_cipher_info_t *cipher_info ) { int ret; operation->mac_size = cipher_info->block_size; operation->iv_required = 0; mbedtls_cipher_init( &operation->ctx.cmac ); ret = mbedtls_cipher_setup( &operation->ctx.cmac, cipher_info ); if( ret != 0 ) return( ret ); ret = mbedtls_cipher_cmac_starts( &operation->ctx.cmac, slot->data.raw.data, key_bits ); return( ret ); } static int psa_hmac_start( psa_mac_operation_t *operation, psa_key_type_t key_type, key_slot_t *slot, psa_algorithm_t alg ) { unsigned char ipad[PSA_CRYPTO_MD_BLOCK_SIZE]; unsigned char *opad = operation->ctx.hmac.opad; size_t i; size_t block_size = psa_get_hash_block_size( ( PSA_ALG_HMAC_HASH( alg ) ) ); unsigned int digest_size = PSA_HASH_SIZE( ( PSA_ALG_HMAC_HASH( alg ) ) ); size_t key_length = slot->data.raw.bytes; psa_status_t status; if( ( block_size == 0 ) || ( digest_size == 0 ) ) return( PSA_ERROR_NOT_SUPPORTED ); if( key_type != PSA_KEY_TYPE_HMAC ) return( PSA_ERROR_INVALID_ARGUMENT ); operation->iv_required = 0; operation->mac_size = digest_size; status = psa_hash_start( &operation->ctx.hmac.hash_ctx, PSA_ALG_HMAC_HASH( alg ) ); if( status != PSA_SUCCESS ) return( status ); if( key_length > block_size ) { status = psa_hash_update( &operation->ctx.hmac.hash_ctx, slot->data.raw.data, slot->data.raw.bytes ); if( status != PSA_SUCCESS ) return( status ); status = psa_hash_finish( &operation->ctx.hmac.hash_ctx, ipad, sizeof( ipad ), &key_length ); if( status != PSA_SUCCESS ) return( status ); } else memcpy( ipad, slot->data.raw.data, slot->data.raw.bytes ); /* ipad contains the key followed by garbage. Xor and fill with 0x36 * to create the ipad value. */ for( i = 0; i < key_length; i++ ) ipad[i] ^= 0x36; memset( ipad + key_length, 0x36, block_size - key_length ); /* Copy the key material from ipad to opad, flipping the requisite bits, * and filling the rest of opad with the requisite constant. */ for( i = 0; i < key_length; i++ ) opad[i] = ipad[i] ^ 0x36 ^ 0x5C; memset( opad + key_length, 0x5C, block_size - key_length ); status = psa_hash_start( &operation->ctx.hmac.hash_ctx, PSA_ALG_HMAC_HASH( alg ) ); if( status != PSA_SUCCESS ) goto cleanup; status = psa_hash_update( &operation->ctx.hmac.hash_ctx, ipad, block_size ); cleanup: mbedtls_zeroize( ipad, key_length ); /* opad is in the context. It needs to stay in memory if this function * succeeds, and it will be wiped by psa_mac_abort() called from * psa_mac_start in the error case. */ return( status ); } psa_status_t psa_mac_start( psa_mac_operation_t *operation, psa_key_slot_t key, psa_algorithm_t alg ) { psa_status_t status; key_slot_t *slot; psa_key_type_t key_type; size_t key_bits; const mbedtls_cipher_info_t *cipher_info; operation->alg = 0; operation->key_set = 0; operation->iv_set = 0; operation->iv_required = 1; operation->has_input = 0; operation->key_usage_sign = 0; operation->key_usage_verify = 0; status = psa_get_key_information( key, &key_type, &key_bits ); if( status != PSA_SUCCESS ) return( status ); slot = &global_data.key_slots[key]; if( slot->type == PSA_KEY_TYPE_NONE ) return( PSA_ERROR_EMPTY_SLOT ); if( ( slot->policy.usage & PSA_KEY_USAGE_SIGN ) != 0 ) operation->key_usage_sign = 1; if( ( slot->policy.usage & PSA_KEY_USAGE_VERIFY ) != 0 ) operation->key_usage_verify = 1; if( ! PSA_ALG_IS_HMAC( alg ) ) { cipher_info = mbedtls_cipher_info_from_psa( alg, key_type, key_bits, NULL ); if( cipher_info == NULL ) return( PSA_ERROR_NOT_SUPPORTED ); operation->mac_size = cipher_info->block_size; } switch( alg ) { #if defined(MBEDTLS_CMAC_C) case PSA_ALG_CMAC: status = mbedtls_to_psa_error( psa_cmac_start( operation, key_bits, slot, cipher_info ) ); break; #endif /* MBEDTLS_CMAC_C */ default: #if defined(MBEDTLS_MD_C) if( PSA_ALG_IS_HMAC( alg ) ) status = psa_hmac_start( operation, key_type, slot, alg ); else #endif /* MBEDTLS_MD_C */ return( PSA_ERROR_NOT_SUPPORTED ); } /* If we reach this point, then the algorithm-specific part of the * context may contain data that needs to be wiped on error. */ if( status != PSA_SUCCESS ) { psa_mac_abort( operation ); } else { operation->alg = alg; operation->key_set = 1; } return( status ); } psa_status_t psa_mac_update( psa_mac_operation_t *operation, const uint8_t *input, size_t input_length ) { int ret = 0 ; psa_status_t status = PSA_SUCCESS; if( ! operation->key_set ) return( PSA_ERROR_BAD_STATE ); if( operation->iv_required && ! operation->iv_set ) return( PSA_ERROR_BAD_STATE ); operation->has_input = 1; switch( operation->alg ) { #if defined(MBEDTLS_CMAC_C) case PSA_ALG_CMAC: ret = mbedtls_cipher_cmac_update( &operation->ctx.cmac, input, input_length ); break; #endif /* MBEDTLS_CMAC_C */ default: #if defined(MBEDTLS_MD_C) if( PSA_ALG_IS_HMAC( operation->alg ) ) { status = psa_hash_update( &operation->ctx.hmac.hash_ctx, input, input_length ); } else #endif /* MBEDTLS_MD_C */ { ret = MBEDTLS_ERR_MD_BAD_INPUT_DATA; } break; } if ( ( ret != 0 ) || ( status != PSA_SUCCESS ) ) { psa_mac_abort( operation ); if ( ret != 0 ) status = mbedtls_to_psa_error( ret ); } return status; } static psa_status_t psa_mac_finish_internal( psa_mac_operation_t *operation, uint8_t *mac, size_t mac_size, size_t *mac_length ) { int ret = 0; psa_status_t status = PSA_SUCCESS; if( ! operation->key_set ) return( PSA_ERROR_BAD_STATE ); if( operation->iv_required && ! operation->iv_set ) return( PSA_ERROR_BAD_STATE ); /* Fill the output buffer with something that isn't a valid mac * (barring an attack on the mac and deliberately-crafted input), * in case the caller doesn't check the return status properly. */ *mac_length = operation->mac_size; memset( mac, '!', mac_size ); if( mac_size < operation->mac_size ) return( PSA_ERROR_BUFFER_TOO_SMALL ); switch( operation->alg ) { #if defined(MBEDTLS_CMAC_C) case PSA_ALG_CMAC: ret = mbedtls_cipher_cmac_finish( &operation->ctx.cmac, mac ); break; #endif /* MBEDTLS_CMAC_C */ default: #if defined(MBEDTLS_MD_C) if( PSA_ALG_IS_HMAC( operation->alg ) ) { unsigned char tmp[MBEDTLS_MD_MAX_SIZE]; unsigned char *opad = operation->ctx.hmac.opad; size_t hash_size = 0; size_t block_size = psa_get_hash_block_size( ( PSA_ALG_HMAC_HASH( operation->alg ) ) ); if( block_size == 0 ) return( PSA_ERROR_NOT_SUPPORTED ); status = psa_hash_finish( &operation->ctx.hmac.hash_ctx, tmp, sizeof( tmp ), &hash_size ); if( status != PSA_SUCCESS ) goto cleanup; /* From here on, tmp needs to be wiped. */ status = psa_hash_start( &operation->ctx.hmac.hash_ctx, PSA_ALG_HMAC_HASH( operation->alg ) ); if( status != PSA_SUCCESS ) goto hmac_cleanup; status = psa_hash_update( &operation->ctx.hmac.hash_ctx, opad, block_size ); if( status != PSA_SUCCESS ) goto hmac_cleanup; status = psa_hash_update( &operation->ctx.hmac.hash_ctx, tmp, hash_size); if( status != PSA_SUCCESS ) goto hmac_cleanup; status = psa_hash_finish( &operation->ctx.hmac.hash_ctx, mac, mac_size, mac_length ); hmac_cleanup: mbedtls_zeroize( tmp, hash_size ); } else #endif /* MBEDTLS_MD_C */ { ret = MBEDTLS_ERR_MD_BAD_INPUT_DATA; } break; } cleanup: if( ( ret == 0 ) && (status == PSA_SUCCESS) ) { return( psa_mac_abort( operation ) ); } else { psa_mac_abort( operation ); if( ret != 0 ) status = mbedtls_to_psa_error(ret); return status; } } psa_status_t psa_mac_finish( psa_mac_operation_t *operation, uint8_t *mac, size_t mac_size, size_t *mac_length ) { if( !( operation->key_usage_sign ) ) return( PSA_ERROR_NOT_PERMITTED ); return( psa_mac_finish_internal( operation, mac, mac_size, mac_length ) ); } #define MBEDTLS_PSA_MAC_MAX_SIZE \ ( MBEDTLS_MD_MAX_SIZE > MBEDTLS_MAX_BLOCK_LENGTH ? \ MBEDTLS_MD_MAX_SIZE : \ MBEDTLS_MAX_BLOCK_LENGTH ) psa_status_t psa_mac_verify( psa_mac_operation_t *operation, const uint8_t *mac, size_t mac_length ) { uint8_t actual_mac[MBEDTLS_PSA_MAC_MAX_SIZE]; size_t actual_mac_length; psa_status_t status; if( !( operation->key_usage_verify ) ) return( PSA_ERROR_NOT_PERMITTED ); status = psa_mac_finish_internal( operation, actual_mac, sizeof( actual_mac ), &actual_mac_length ); if( status != PSA_SUCCESS ) return( status ); if( actual_mac_length != mac_length ) return( PSA_ERROR_INVALID_SIGNATURE ); if( safer_memcmp( mac, actual_mac, actual_mac_length ) != 0 ) return( PSA_ERROR_INVALID_SIGNATURE ); return( PSA_SUCCESS ); } /****************************************************************/ /* Asymmetric cryptography */ /****************************************************************/ /* Decode the hash algorithm from alg and store the mbedtls encoding in * md_alg. Verify that the hash length is consistent. */ static psa_status_t psa_rsa_decode_md_type( psa_algorithm_t alg, size_t hash_length, mbedtls_md_type_t *md_alg ) { psa_algorithm_t hash_alg = PSA_ALG_RSA_GET_HASH( alg ); const mbedtls_md_info_t *md_info = mbedtls_md_info_from_psa( hash_alg ); *md_alg = hash_alg == 0 ? MBEDTLS_MD_NONE : mbedtls_md_get_type( md_info ); if( *md_alg == MBEDTLS_MD_NONE ) { #if SIZE_MAX > UINT_MAX if( hash_length > UINT_MAX ) return( PSA_ERROR_INVALID_ARGUMENT ); #endif } else { if( mbedtls_md_get_size( md_info ) != hash_length ) return( PSA_ERROR_INVALID_ARGUMENT ); if( md_info == NULL ) return( PSA_ERROR_NOT_SUPPORTED ); } return( PSA_SUCCESS ); } psa_status_t psa_asymmetric_sign( psa_key_slot_t key, psa_algorithm_t alg, const uint8_t *hash, size_t hash_length, const uint8_t *salt, size_t salt_length, uint8_t *signature, size_t signature_size, size_t *signature_length ) { key_slot_t *slot; psa_status_t status; *signature_length = 0; (void) salt; (void) salt_length; if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT ) return( PSA_ERROR_EMPTY_SLOT ); slot = &global_data.key_slots[key]; if( slot->type == PSA_KEY_TYPE_NONE ) return( PSA_ERROR_EMPTY_SLOT ); if( ! PSA_KEY_TYPE_IS_KEYPAIR( slot->type ) ) return( PSA_ERROR_INVALID_ARGUMENT ); if( ! ( slot->policy.usage & PSA_KEY_USAGE_SIGN ) ) return( PSA_ERROR_NOT_PERMITTED ); #if defined(MBEDTLS_RSA_C) if( slot->type == PSA_KEY_TYPE_RSA_KEYPAIR ) { mbedtls_rsa_context *rsa = slot->data.rsa; int ret; mbedtls_md_type_t md_alg; status = psa_rsa_decode_md_type( alg, hash_length, &md_alg ); if( status != PSA_SUCCESS ) return( status ); if( signature_size < rsa->len ) return( PSA_ERROR_BUFFER_TOO_SMALL ); #if defined(MBEDTLS_PKCS1_V15) if( PSA_ALG_IS_RSA_PKCS1V15_SIGN( alg ) ) { mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE ); ret = mbedtls_rsa_pkcs1_sign( rsa, mbedtls_ctr_drbg_random, &global_data.ctr_drbg, MBEDTLS_RSA_PRIVATE, md_alg, hash_length, hash, signature ); } else #endif /* MBEDTLS_PKCS1_V15 */ #if defined(MBEDTLS_PKCS1_V21) if( alg == PSA_ALG_RSA_PSS_MGF1 ) { mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V21, md_alg ); ret = mbedtls_rsa_rsassa_pss_sign( rsa, mbedtls_ctr_drbg_random, &global_data.ctr_drbg, MBEDTLS_RSA_PRIVATE, md_alg, hash_length, hash, signature ); } else #endif /* MBEDTLS_PKCS1_V21 */ { return( PSA_ERROR_INVALID_ARGUMENT ); } if( ret == 0 ) *signature_length = rsa->len; return( mbedtls_to_psa_error( ret ) ); } else #endif /* defined(MBEDTLS_RSA_C) */ #if defined(MBEDTLS_ECP_C) if( PSA_KEY_TYPE_IS_ECC( slot->type ) ) { mbedtls_ecp_keypair *ecdsa = slot->data.ecp; int ret; const mbedtls_md_info_t *md_info; mbedtls_md_type_t md_alg; if( signature_size < PSA_ECDSA_SIGNATURE_SIZE( ecdsa->grp.pbits ) ) return( PSA_ERROR_BUFFER_TOO_SMALL ); md_info = mbedtls_md_info_from_psa( alg ); md_alg = mbedtls_md_get_type( md_info ); ret = mbedtls_ecdsa_write_signature( ecdsa, md_alg, hash, hash_length, signature, signature_length, mbedtls_ctr_drbg_random, &global_data.ctr_drbg ); return( mbedtls_to_psa_error( ret ) ); } else #endif /* defined(MBEDTLS_ECP_C) */ { return( PSA_ERROR_NOT_SUPPORTED ); } } psa_status_t psa_asymmetric_verify( psa_key_slot_t key, psa_algorithm_t alg, const uint8_t *hash, size_t hash_length, const uint8_t *salt, size_t salt_length, uint8_t *signature, size_t signature_size ) { key_slot_t *slot; psa_status_t status; (void) salt; (void) salt_length; if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT ) return( PSA_ERROR_INVALID_ARGUMENT ); slot = &global_data.key_slots[key]; if( slot->type == PSA_KEY_TYPE_NONE ) return( PSA_ERROR_EMPTY_SLOT ); if( ! ( slot->policy.usage & PSA_KEY_USAGE_VERIFY ) ) return( PSA_ERROR_NOT_PERMITTED ); #if defined(MBEDTLS_RSA_C) if( ( slot->type == PSA_KEY_TYPE_RSA_KEYPAIR ) || ( slot->type == PSA_KEY_TYPE_RSA_PUBLIC_KEY ) ) { mbedtls_rsa_context *rsa = slot->data.rsa; int ret; mbedtls_md_type_t md_alg; status = psa_rsa_decode_md_type( alg, hash_length, &md_alg ); if( status != PSA_SUCCESS ) return( status ); if( signature_size < rsa->len ) return( PSA_ERROR_BUFFER_TOO_SMALL ); #if defined(MBEDTLS_PKCS1_V15) if( PSA_ALG_IS_RSA_PKCS1V15_SIGN( alg ) ) { mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE ); ret = mbedtls_rsa_pkcs1_verify( rsa, mbedtls_ctr_drbg_random, &global_data.ctr_drbg, MBEDTLS_RSA_PUBLIC, md_alg, hash_length, hash, signature ); } else #endif /* MBEDTLS_PKCS1_V15 */ #if defined(MBEDTLS_PKCS1_V21) if( alg == PSA_ALG_RSA_PSS_MGF1 ) { mbedtls_rsa_set_padding( rsa, MBEDTLS_RSA_PKCS_V21, md_alg ); ret = mbedtls_rsa_rsassa_pss_verify( rsa, mbedtls_ctr_drbg_random, &global_data.ctr_drbg, MBEDTLS_RSA_PUBLIC, md_alg, hash_length, hash, signature ); } else #endif /* MBEDTLS_PKCS1_V21 */ { return( PSA_ERROR_INVALID_ARGUMENT ); } return( mbedtls_to_psa_error( ret ) ); } else #endif /* defined(MBEDTLS_RSA_C) */ #if defined(MBEDTLS_ECP_C) if( PSA_KEY_TYPE_IS_ECC( slot->type ) ) { mbedtls_ecp_keypair *ecdsa = slot->data.ecp; int ret; (void)alg; ret = mbedtls_ecdsa_read_signature( ecdsa, hash, hash_length, signature, signature_size ); return( mbedtls_to_psa_error( ret ) ); } else #endif /* defined(MBEDTLS_ECP_C) */ { return( PSA_ERROR_NOT_SUPPORTED ); } } psa_status_t psa_asymmetric_encrypt( psa_key_slot_t key, psa_algorithm_t alg, const uint8_t *input, size_t input_length, const uint8_t *salt, size_t salt_length, uint8_t *output, size_t output_size, size_t *output_length ) { key_slot_t *slot; (void) salt; (void) salt_length; *output_length = 0; if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT ) return( PSA_ERROR_INVALID_ARGUMENT ); slot = &global_data.key_slots[key]; if( slot->type == PSA_KEY_TYPE_NONE ) return( PSA_ERROR_EMPTY_SLOT ); if( ! PSA_KEY_TYPE_IS_KEYPAIR( slot->type ) ) return( PSA_ERROR_INVALID_ARGUMENT ); if( ! ( slot->policy.usage & PSA_KEY_USAGE_ENCRYPT ) ) return( PSA_ERROR_NOT_PERMITTED ); #if defined(MBEDTLS_RSA_C) if( ( slot->type == PSA_KEY_TYPE_RSA_KEYPAIR ) || ( slot->type == PSA_KEY_TYPE_RSA_PUBLIC_KEY ) ) { mbedtls_rsa_context *rsa = slot->data.rsa; int ret; if( output_size < rsa->len ) return( PSA_ERROR_INVALID_ARGUMENT ); #if defined(MBEDTLS_PKCS1_V15) if( alg == PSA_ALG_RSA_PKCS1V15_CRYPT ) { ret = mbedtls_rsa_pkcs1_encrypt( rsa, mbedtls_ctr_drbg_random, &global_data.ctr_drbg, MBEDTLS_RSA_PUBLIC, input_length, input, output ); } else #endif /* MBEDTLS_PKCS1_V15 */ #if defined(MBEDTLS_PKCS1_V21) if( PSA_ALG_IS_RSA_OAEP_MGF1( alg ) ) { return( PSA_ERROR_NOT_SUPPORTED ); } else #endif /* MBEDTLS_PKCS1_V21 */ { return( PSA_ERROR_INVALID_ARGUMENT ); } if( ret == 0 ) *output_length = rsa->len; return( mbedtls_to_psa_error( ret ) ); } else #endif /* defined(MBEDTLS_RSA_C) */ { return( PSA_ERROR_NOT_SUPPORTED ); } } psa_status_t psa_asymmetric_decrypt( psa_key_slot_t key, psa_algorithm_t alg, const uint8_t *input, size_t input_length, const uint8_t *salt, size_t salt_length, uint8_t *output, size_t output_size, size_t *output_length ) { key_slot_t *slot; (void) salt; (void) salt_length; *output_length = 0; if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT ) return( PSA_ERROR_EMPTY_SLOT ); slot = &global_data.key_slots[key]; if( slot->type == PSA_KEY_TYPE_NONE ) return( PSA_ERROR_EMPTY_SLOT ); if( ! PSA_KEY_TYPE_IS_KEYPAIR( slot->type ) ) return( PSA_ERROR_INVALID_ARGUMENT ); if( ! ( slot->policy.usage & PSA_KEY_USAGE_DECRYPT ) ) return( PSA_ERROR_NOT_PERMITTED ); #if defined(MBEDTLS_RSA_C) if( slot->type == PSA_KEY_TYPE_RSA_KEYPAIR ) { mbedtls_rsa_context *rsa = slot->data.rsa; int ret; if( input_length != rsa->len ) return( PSA_ERROR_INVALID_ARGUMENT ); #if defined(MBEDTLS_PKCS1_V15) if( alg == PSA_ALG_RSA_PKCS1V15_CRYPT ) { ret = mbedtls_rsa_pkcs1_decrypt( rsa, mbedtls_ctr_drbg_random, &global_data.ctr_drbg, MBEDTLS_RSA_PRIVATE, output_length, input, output, output_size ); } else #endif /* MBEDTLS_PKCS1_V15 */ #if defined(MBEDTLS_PKCS1_V21) if( PSA_ALG_IS_RSA_OAEP_MGF1( alg ) ) { return( PSA_ERROR_NOT_SUPPORTED ); } else #endif /* MBEDTLS_PKCS1_V21 */ { return( PSA_ERROR_INVALID_ARGUMENT ); } return( mbedtls_to_psa_error( ret ) ); } else #endif /* defined(MBEDTLS_RSA_C) */ { return( PSA_ERROR_NOT_SUPPORTED ); } } /****************************************************************/ /* Symmetric cryptography */ /****************************************************************/ static psa_status_t psa_cipher_setup( psa_cipher_operation_t *operation, psa_key_slot_t key, psa_algorithm_t alg, mbedtls_operation_t cipher_operation ) { int ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; psa_status_t status; key_slot_t *slot; psa_key_type_t key_type; size_t key_bits; const mbedtls_cipher_info_t *cipher_info = NULL; operation->alg = alg; operation->key_set = 0; operation->iv_set = 0; operation->iv_required = 1; operation->iv_size = 0; operation->block_size = 0; status = psa_get_key_information( key, &key_type, &key_bits ); if( status != PSA_SUCCESS ) return( status ); slot = &global_data.key_slots[key]; cipher_info = mbedtls_cipher_info_from_psa( alg, key_type, key_bits, NULL ); if( cipher_info == NULL ) return( PSA_ERROR_NOT_SUPPORTED ); mbedtls_cipher_init( &operation->ctx.cipher ); ret = mbedtls_cipher_setup( &operation->ctx.cipher, cipher_info ); if( ret != 0 ) { psa_cipher_abort( operation ); return( mbedtls_to_psa_error( ret ) ); } ret = mbedtls_cipher_setkey( &operation->ctx.cipher, slot->data.raw.data, key_bits, cipher_operation ); if( ret != 0 ) { psa_cipher_abort( operation ); return( mbedtls_to_psa_error( ret ) ); } #if defined(MBEDTLS_CIPHER_MODE_WITH_PADDING) if( ( alg & ~PSA_ALG_BLOCK_CIPHER_PADDING_MASK ) == PSA_ALG_CBC_BASE ) { psa_algorithm_t padding_mode = alg & PSA_ALG_BLOCK_CIPHER_PADDING_MASK; mbedtls_cipher_padding_t mode; switch ( padding_mode ) { case PSA_ALG_BLOCK_CIPHER_PAD_PKCS7: mode = MBEDTLS_PADDING_PKCS7; break; case PSA_ALG_BLOCK_CIPHER_PAD_NONE: mode = MBEDTLS_PADDING_NONE; break; default: psa_cipher_abort( operation ); return( PSA_ERROR_INVALID_ARGUMENT ); } ret = mbedtls_cipher_set_padding_mode( &operation->ctx.cipher, mode ); if( ret != 0 ) { psa_cipher_abort( operation ); return( mbedtls_to_psa_error( ret ) ); } } #endif //MBEDTLS_CIPHER_MODE_WITH_PADDING operation->key_set = 1; operation->alg = alg; operation->block_size = ( PSA_ALG_IS_BLOCK_CIPHER( alg ) ? PSA_BLOCK_CIPHER_BLOCK_SIZE( key_type ) : 1 ); if( PSA_ALG_IS_BLOCK_CIPHER( alg ) || ( alg == PSA_ALG_CTR ) ) { operation->iv_size = PSA_BLOCK_CIPHER_BLOCK_SIZE( key_type ); } return( PSA_SUCCESS ); } psa_status_t psa_encrypt_setup( psa_cipher_operation_t *operation, psa_key_slot_t key, psa_algorithm_t alg ) { return psa_cipher_setup( operation, key, alg, MBEDTLS_ENCRYPT ); } psa_status_t psa_decrypt_setup( psa_cipher_operation_t *operation, psa_key_slot_t key, psa_algorithm_t alg ) { return psa_cipher_setup( operation, key, alg, MBEDTLS_DECRYPT ); } psa_status_t psa_encrypt_generate_iv( psa_cipher_operation_t *operation, unsigned char *iv, size_t iv_size, size_t *iv_length ) { int ret = PSA_SUCCESS; if( operation->iv_set || !( operation->iv_required ) ) return( PSA_ERROR_BAD_STATE ); if( iv_size < operation->iv_size ) { ret = PSA_ERROR_BUFFER_TOO_SMALL; goto exit; } ret = mbedtls_ctr_drbg_random( &global_data.ctr_drbg, iv, operation->iv_size ); if( ret != 0 ) { ret = mbedtls_to_psa_error( ret ); goto exit; } *iv_length = operation->iv_size; ret = psa_encrypt_set_iv( operation, iv, *iv_length ); exit: if( ret != PSA_SUCCESS ) psa_cipher_abort( operation ); return( ret ); } psa_status_t psa_encrypt_set_iv( psa_cipher_operation_t *operation, const unsigned char *iv, size_t iv_length ) { int ret = PSA_SUCCESS; if( operation->iv_set || !( operation->iv_required ) ) return( PSA_ERROR_BAD_STATE ); if( iv_length != operation->iv_size ) { psa_cipher_abort( operation ); return( PSA_ERROR_INVALID_ARGUMENT ); } ret = mbedtls_cipher_set_iv( &operation->ctx.cipher, iv, iv_length ); if( ret != 0 ) { psa_cipher_abort( operation ); return( mbedtls_to_psa_error( ret ) ); } operation->iv_set = 1; return( PSA_SUCCESS ); } psa_status_t psa_cipher_update( psa_cipher_operation_t *operation, const uint8_t *input, size_t input_length, unsigned char *output, size_t output_size, size_t *output_length ) { int ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; size_t expected_output_size; if( PSA_ALG_IS_BLOCK_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_size * operation->block_size; } else { expected_output_size = input_length; } if( output_size < expected_output_size ) return( PSA_ERROR_BUFFER_TOO_SMALL ); ret = mbedtls_cipher_update( &operation->ctx.cipher, input, input_length, output, output_length ); if( ret != 0 ) { psa_cipher_abort( operation ); return( mbedtls_to_psa_error( ret ) ); } return( PSA_SUCCESS ); } psa_status_t psa_cipher_finish( psa_cipher_operation_t *operation, uint8_t *output, size_t output_size, size_t *output_length ) { int ret = MBEDTLS_ERR_CIPHER_FEATURE_UNAVAILABLE; uint8_t temp_output_buffer[MBEDTLS_MAX_BLOCK_LENGTH]; if( ! operation->key_set ) { psa_cipher_abort( operation ); return( PSA_ERROR_BAD_STATE ); } if( operation->iv_required && ! operation->iv_set ) { psa_cipher_abort( operation ); return( PSA_ERROR_BAD_STATE ); } if( operation->ctx.cipher.operation == MBEDTLS_ENCRYPT && PSA_ALG_IS_BLOCK_CIPHER( operation->alg ) ) { psa_algorithm_t padding_mode = operation->alg & PSA_ALG_BLOCK_CIPHER_PADDING_MASK; if( operation->ctx.cipher.unprocessed_len >= operation->block_size ) { psa_cipher_abort( operation ); return( PSA_ERROR_TAMPERING_DETECTED ); } if( padding_mode == PSA_ALG_BLOCK_CIPHER_PAD_NONE ) { if( operation->ctx.cipher.unprocessed_len != 0 ) { psa_cipher_abort( operation ); return( PSA_ERROR_INVALID_ARGUMENT ); } } } ret = mbedtls_cipher_finish( &operation->ctx.cipher, temp_output_buffer, output_length ); if( ret != 0 ) { psa_cipher_abort( operation ); return( mbedtls_to_psa_error( ret ) ); } if( output_size >= *output_length ) memcpy( output, temp_output_buffer, *output_length ); else { psa_cipher_abort( operation ); return( PSA_ERROR_BUFFER_TOO_SMALL ); } return( PSA_SUCCESS ); } psa_status_t psa_cipher_abort( psa_cipher_operation_t *operation ) { mbedtls_cipher_free( &operation->ctx.cipher ); operation->alg = 0; operation->key_set = 0; operation->iv_set = 0; operation->iv_size = 0; operation->block_size = 0; operation->iv_required = 0; return( PSA_SUCCESS ); } /****************************************************************/ /* Key Policy */ /****************************************************************/ void psa_key_policy_init(psa_key_policy_t *policy) { memset( policy, 0, sizeof( psa_key_policy_t ) ); } void psa_key_policy_set_usage(psa_key_policy_t *policy, psa_key_usage_t usage, psa_algorithm_t alg) { policy->usage = usage; policy->alg = alg; } psa_key_usage_t psa_key_policy_get_usage(psa_key_policy_t *policy) { return( policy->usage ); } psa_algorithm_t psa_key_policy_get_algorithm(psa_key_policy_t *policy) { return( policy->alg ); } psa_status_t psa_set_key_policy(psa_key_slot_t key, const psa_key_policy_t *policy) { key_slot_t *slot; if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT || policy == NULL ) return( PSA_ERROR_INVALID_ARGUMENT ); slot = &global_data.key_slots[key]; if( slot->type != PSA_KEY_TYPE_NONE ) return( PSA_ERROR_OCCUPIED_SLOT ); if( ( policy->usage & ~( PSA_KEY_USAGE_EXPORT | PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT | PSA_KEY_USAGE_SIGN | PSA_KEY_USAGE_VERIFY ) ) != 0 ) return( PSA_ERROR_INVALID_ARGUMENT ); slot->policy = *policy; return( PSA_SUCCESS ); } psa_status_t psa_get_key_policy(psa_key_slot_t key, psa_key_policy_t *policy) { key_slot_t *slot; if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT || policy == NULL ) return( PSA_ERROR_INVALID_ARGUMENT ); slot = &global_data.key_slots[key]; *policy = slot->policy; return( PSA_SUCCESS ); } /****************************************************************/ /* Key Lifetime */ /****************************************************************/ psa_status_t psa_get_key_lifetime(psa_key_slot_t key, psa_key_lifetime_t *lifetime) { key_slot_t *slot; if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT ) return( PSA_ERROR_INVALID_ARGUMENT ); slot = &global_data.key_slots[key]; *lifetime = slot->lifetime; return( PSA_SUCCESS ); } psa_status_t psa_set_key_lifetime(psa_key_slot_t key, const psa_key_lifetime_t lifetime) { key_slot_t *slot; if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT ) return( PSA_ERROR_INVALID_ARGUMENT ); if( lifetime != PSA_KEY_LIFETIME_VOLATILE && lifetime != PSA_KEY_LIFETIME_PERSISTENT && lifetime != PSA_KEY_LIFETIME_WRITE_ONCE) return( PSA_ERROR_INVALID_ARGUMENT ); slot = &global_data.key_slots[key]; if( slot->type != PSA_KEY_TYPE_NONE ) return( PSA_ERROR_OCCUPIED_SLOT ); if( lifetime != PSA_KEY_LIFETIME_VOLATILE ) return( PSA_ERROR_NOT_SUPPORTED ); slot->lifetime = lifetime; return( PSA_SUCCESS ); } /****************************************************************/ /* AEAD */ /****************************************************************/ psa_status_t psa_aead_encrypt( psa_key_slot_t key, psa_algorithm_t alg, const uint8_t *nonce, size_t nonce_length, const uint8_t *additional_data, size_t additional_data_length, const uint8_t *plaintext, size_t plaintext_length, uint8_t *ciphertext, size_t ciphertext_size, size_t *ciphertext_length ) { int ret; psa_status_t status; key_slot_t *slot; psa_key_type_t key_type; size_t key_bits; uint8_t *tag; size_t tag_length; mbedtls_cipher_id_t cipher_id; const mbedtls_cipher_info_t *cipher_info = NULL; *ciphertext_length = 0; status = psa_get_key_information( key, &key_type, &key_bits ); if( status != PSA_SUCCESS ) return( status ); slot = &global_data.key_slots[key]; if( slot->type == PSA_KEY_TYPE_NONE ) return( PSA_ERROR_EMPTY_SLOT ); cipher_info = mbedtls_cipher_info_from_psa( alg, key_type, key_bits, &cipher_id ); if( cipher_info == NULL ) return( PSA_ERROR_NOT_SUPPORTED ); if( !( slot->policy.usage & PSA_KEY_USAGE_ENCRYPT ) ) return( PSA_ERROR_NOT_PERMITTED ); if ( ( key_type & PSA_KEY_TYPE_CATEGORY_MASK ) != PSA_KEY_TYPE_CATEGORY_SYMMETRIC ) return( PSA_ERROR_INVALID_ARGUMENT ); if( alg == PSA_ALG_GCM ) { mbedtls_gcm_context gcm; tag_length = 16; if( PSA_BLOCK_CIPHER_BLOCK_SIZE( key_type ) != 16 ) return( PSA_ERROR_INVALID_ARGUMENT ); //make sure we have place to hold the tag in the ciphertext buffer if( ciphertext_size < ( plaintext_length + tag_length ) ) return( PSA_ERROR_BUFFER_TOO_SMALL ); //update the tag pointer to point to the end of the ciphertext_length tag = ciphertext + plaintext_length; mbedtls_gcm_init( &gcm ); ret = mbedtls_gcm_setkey( &gcm, cipher_id, slot->data.raw.data, key_bits ); if( ret != 0 ) { mbedtls_gcm_free( &gcm ); return( mbedtls_to_psa_error( ret ) ); } ret = mbedtls_gcm_crypt_and_tag( &gcm, MBEDTLS_GCM_ENCRYPT, plaintext_length, nonce, nonce_length, additional_data, additional_data_length, plaintext, ciphertext, tag_length, tag ); mbedtls_gcm_free( &gcm ); } else if( alg == PSA_ALG_CCM ) { mbedtls_ccm_context ccm; tag_length = 16; if( PSA_BLOCK_CIPHER_BLOCK_SIZE( key_type ) != 16 ) return( PSA_ERROR_INVALID_ARGUMENT ); if( nonce_length < 7 || nonce_length > 13 ) return( PSA_ERROR_INVALID_ARGUMENT ); //make sure we have place to hold the tag in the ciphertext buffer if( ciphertext_size < ( plaintext_length + tag_length ) ) return( PSA_ERROR_BUFFER_TOO_SMALL ); //update the tag pointer to point to the end of the ciphertext_length tag = ciphertext + plaintext_length; mbedtls_ccm_init( &ccm ); ret = mbedtls_ccm_setkey( &ccm, cipher_id, slot->data.raw.data, key_bits ); if( ret != 0 ) { mbedtls_ccm_free( &ccm ); return( mbedtls_to_psa_error( ret ) ); } ret = mbedtls_ccm_encrypt_and_tag( &ccm, plaintext_length, nonce, nonce_length, additional_data, additional_data_length, plaintext, ciphertext, tag, tag_length ); mbedtls_ccm_free( &ccm ); } else { return( PSA_ERROR_NOT_SUPPORTED ); } if( ret != 0 ) { memset( ciphertext, 0, ciphertext_size ); return( mbedtls_to_psa_error( ret ) ); } *ciphertext_length = plaintext_length + tag_length; return( PSA_SUCCESS ); } /* Locate the tag in a ciphertext buffer containing the encrypted data * followed by the tag. Return the length of the part preceding the tag in * *plaintext_length. This is the size of the plaintext in modes where * the encrypted data has the same size as the plaintext, such as * CCM and GCM. */ static psa_status_t psa_aead_unpadded_locate_tag( size_t tag_length, const uint8_t *ciphertext, size_t ciphertext_length, size_t plaintext_size, const uint8_t **p_tag ) { size_t payload_length; if( tag_length > ciphertext_length ) return( PSA_ERROR_INVALID_ARGUMENT ); payload_length = ciphertext_length - tag_length; if( payload_length > plaintext_size ) return( PSA_ERROR_BUFFER_TOO_SMALL ); *p_tag = ciphertext + payload_length; return( PSA_SUCCESS ); } psa_status_t psa_aead_decrypt( psa_key_slot_t key, psa_algorithm_t alg, const uint8_t *nonce, size_t nonce_length, const uint8_t *additional_data, size_t additional_data_length, const uint8_t *ciphertext, size_t ciphertext_length, uint8_t *plaintext, size_t plaintext_size, size_t *plaintext_length ) { int ret; psa_status_t status; key_slot_t *slot; psa_key_type_t key_type; size_t key_bits; const uint8_t *tag; size_t tag_length; mbedtls_cipher_id_t cipher_id; const mbedtls_cipher_info_t *cipher_info = NULL; *plaintext_length = 0; status = psa_get_key_information( key, &key_type, &key_bits ); if( status != PSA_SUCCESS ) return( status ); slot = &global_data.key_slots[key]; if( slot->type == PSA_KEY_TYPE_NONE ) return( PSA_ERROR_EMPTY_SLOT ); cipher_info = mbedtls_cipher_info_from_psa( alg, key_type, key_bits, &cipher_id ); if( cipher_info == NULL ) return( PSA_ERROR_NOT_SUPPORTED ); if( !( slot->policy.usage & PSA_KEY_USAGE_DECRYPT ) ) return( PSA_ERROR_NOT_PERMITTED ); if ( ( key_type & PSA_KEY_TYPE_CATEGORY_MASK ) != PSA_KEY_TYPE_CATEGORY_SYMMETRIC ) return( PSA_ERROR_INVALID_ARGUMENT ); if( alg == PSA_ALG_GCM ) { mbedtls_gcm_context gcm; tag_length = 16; status = psa_aead_unpadded_locate_tag( tag_length, ciphertext, ciphertext_length, plaintext_size, &tag ); if( status != PSA_SUCCESS ) return( status ); mbedtls_gcm_init( &gcm ); ret = mbedtls_gcm_setkey( &gcm, cipher_id, slot->data.raw.data, key_bits ); if( ret != 0 ) { mbedtls_gcm_free( &gcm ); return( mbedtls_to_psa_error( ret ) ); } ret = mbedtls_gcm_auth_decrypt( &gcm, ciphertext_length - tag_length, nonce, nonce_length, additional_data, additional_data_length, tag, tag_length, ciphertext, plaintext ); mbedtls_gcm_free( &gcm ); } else if( alg == PSA_ALG_CCM ) { mbedtls_ccm_context ccm; if( nonce_length < 7 || nonce_length > 13 ) return( PSA_ERROR_INVALID_ARGUMENT ); tag_length = 16; status = psa_aead_unpadded_locate_tag( tag_length, ciphertext, ciphertext_length, plaintext_size, &tag ); if( status != PSA_SUCCESS ) return( status ); mbedtls_ccm_init( &ccm ); ret = mbedtls_ccm_setkey( &ccm, cipher_id, slot->data.raw.data, key_bits ); if( ret != 0 ) { mbedtls_ccm_free( &ccm ); return( mbedtls_to_psa_error( ret ) ); } ret = mbedtls_ccm_auth_decrypt( &ccm, ciphertext_length - tag_length, nonce, nonce_length, additional_data, additional_data_length, ciphertext, plaintext, tag, tag_length ); mbedtls_ccm_free( &ccm ); } else { return( PSA_ERROR_NOT_SUPPORTED ); } if( ret != 0 ) memset( plaintext, 0, plaintext_size ); else *plaintext_length = ciphertext_length - tag_length; return( mbedtls_to_psa_error( ret ) ); } /****************************************************************/ /* Module setup */ /****************************************************************/ void mbedtls_psa_crypto_free( void ) { size_t key; for( key = 1; key < MBEDTLS_PSA_KEY_SLOT_COUNT; key++ ) psa_destroy_key( key ); mbedtls_ctr_drbg_free( &global_data.ctr_drbg ); mbedtls_entropy_free( &global_data.entropy ); mbedtls_zeroize( &global_data, sizeof( global_data ) ); } psa_status_t psa_crypto_init( void ) { int ret; const unsigned char drbg_seed[] = "PSA"; if( global_data.initialized != 0 ) return( PSA_SUCCESS ); mbedtls_zeroize( &global_data, sizeof( global_data ) ); mbedtls_entropy_init( &global_data.entropy ); mbedtls_ctr_drbg_init( &global_data.ctr_drbg ); ret = mbedtls_ctr_drbg_seed( &global_data.ctr_drbg, mbedtls_entropy_func, &global_data.entropy, drbg_seed, sizeof( drbg_seed ) - 1 ); if( ret != 0 ) goto exit; global_data.initialized = 1; exit: if( ret != 0 ) mbedtls_psa_crypto_free( ); return( mbedtls_to_psa_error( ret ) ); } #endif /* MBEDTLS_PSA_CRYPTO_C */