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mbedtls/library/psa_crypto.c
Gilles Peskine 6a0a44e167 HMAC: clean up local variables containing key material 
In psa_mac_start, the hash of the key and ipad contain material that
can be used to make HMAC calculations with the key, therefore they
must be wiped.

In psa_mac_finish_internal, tmp contains an intermediate value which
could reveal the HMAC. This is definitely sensitive in the verify case,
and marginally sensitive in the finish case (it isn't if the hash
function is ideal, but it could make things worse if the hash function
is partially broken).
2018-09-12 16:13:49 +03:00

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/*
* 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 <stdlib.h>
#include <string.h>
#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 ) );
}
#define PSA_HASH_BLOCK_SIZE(alg) \
( \
(alg) == PSA_ALG_MD2 ? 16 : \
(alg) == PSA_ALG_MD4 ? 64 : \
(alg) == PSA_ALG_MD5 ? 64 : \
(alg) == PSA_ALG_RIPEMD160 ? 64 : \
(alg) == PSA_ALG_SHA_1 ? 64 : \
(alg) == PSA_ALG_SHA_224 ? 64 : \
(alg) == PSA_ALG_SHA_256 ? 64 : \
(alg) == PSA_ALG_SHA_384 ? 128 : \
(alg) == PSA_ALG_SHA_512 ? 128 : \
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_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 );
if ( operation->ctx.hmac.hmac_ctx != NULL )
{
mbedtls_zeroize( operation->ctx.hmac.hmac_ctx,
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,
size_t key_bits,
key_slot_t *slot,
psa_algorithm_t alg )
{
unsigned char sum[PSA_CRYPTO_MD_MAX_SIZE];
unsigned char ipad[PSA_CRYPTO_MD_BLOCK_SIZE];
unsigned char *opad = operation->ctx.hmac.hmac_ctx;
size_t i;
size_t block_size =
PSA_HASH_BLOCK_SIZE( ( PSA_ALG_HMAC_HASH( alg ) ) );
unsigned int digest_size =
PSA_HASH_FINAL_SIZE( ( PSA_ALG_HMAC_HASH( alg ) ) );
uint8_t* key_ptr = slot->data.raw.data;
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_bits / 8 > block_size )
{
status = psa_hash_update( &operation->ctx.hmac.hash_ctx,
key_ptr, slot->data.raw.bytes);
if( status != PSA_SUCCESS )
return( status );
status = psa_hash_finish( &operation->ctx.hmac.hash_ctx,
sum, sizeof( sum ), &key_length );
if( status != PSA_SUCCESS )
return( status );
key_ptr = sum;
}
memset( ipad, 0x36, block_size );
memset( opad, 0x5C, block_size );
for( i = 0; i < key_length; i++ )
{
ipad[i] = ipad[i] ^ key_ptr[i];
opad[i] = opad[i] ^ key_ptr[i];
}
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:
if( key_bits / 8 > (size_t) block_size )
mbedtls_zeroize( sum, key_length );
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, key_bits, 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.hmac_ctx;
size_t hash_size = 0;
unsigned int block_size =
PSA_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 */
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