blob: 6e73d12c682952fc3a843423486b2c0a5579308c [file] [log] [blame]
/*
* PSA crypto layer on top of Mbed TLS crypto
*/
/*
* Copyright The Mbed TLS Contributors
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "common.h"
#if defined(MBEDTLS_PSA_CRYPTO_C)
#if defined(MBEDTLS_PSA_CRYPTO_CONFIG)
#include "check_crypto_config.h"
#endif
#include "psa/crypto.h"
#include "psa_crypto_cipher.h"
#include "psa_crypto_core.h"
#include "psa_crypto_invasive.h"
#include "psa_crypto_driver_wrappers.h"
#include "psa_crypto_ecp.h"
#include "psa_crypto_hash.h"
#include "psa_crypto_mac.h"
#include "psa_crypto_rsa.h"
#include "psa_crypto_ecp.h"
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
#include "psa_crypto_se.h"
#endif
#include "psa_crypto_slot_management.h"
/* Include internal declarations that are useful for implementing persistently
* stored keys. */
#include "psa_crypto_storage.h"
#include "psa_crypto_random_impl.h"
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "mbedtls/platform.h"
#if !defined(MBEDTLS_PLATFORM_C)
#define mbedtls_calloc calloc
#define mbedtls_free free
#endif
#include "mbedtls/aes.h"
#include "mbedtls/asn1.h"
#include "mbedtls/asn1write.h"
#include "mbedtls/bignum.h"
#include "mbedtls/camellia.h"
#include "mbedtls/chacha20.h"
#include "mbedtls/chachapoly.h"
#include "mbedtls/cipher.h"
#include "mbedtls/ccm.h"
#include "mbedtls/cmac.h"
#include "mbedtls/des.h"
#include "mbedtls/ecdh.h"
#include "mbedtls/ecp.h"
#include "mbedtls/entropy.h"
#include "mbedtls/error.h"
#include "mbedtls/gcm.h"
#include "mbedtls/md5.h"
#include "mbedtls/md.h"
#include "md_wrap.h"
#include "mbedtls/pk.h"
#include "pk_wrap.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
#include "mbedtls/ripemd160.h"
#include "mbedtls/rsa.h"
#include "mbedtls/sha1.h"
#include "mbedtls/sha256.h"
#include "mbedtls/sha512.h"
#define ARRAY_LENGTH( array ) ( sizeof( array ) / sizeof( *( array ) ) )
/****************************************************************/
/* Global data, support functions and library management */
/****************************************************************/
static int key_type_is_raw_bytes( psa_key_type_t type )
{
return( PSA_KEY_TYPE_IS_UNSTRUCTURED( type ) );
}
/* Values for psa_global_data_t::rng_state */
#define RNG_NOT_INITIALIZED 0
#define RNG_INITIALIZED 1
#define RNG_SEEDED 2
typedef struct
{
mbedtls_psa_random_context_t rng;
unsigned initialized : 1;
unsigned rng_state : 2;
} psa_global_data_t;
static psa_global_data_t global_data;
#if !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG)
mbedtls_psa_drbg_context_t *const mbedtls_psa_random_state =
&global_data.rng.drbg;
#endif
#define GUARD_MODULE_INITIALIZED \
if( global_data.initialized == 0 ) \
return( PSA_ERROR_BAD_STATE );
psa_status_t mbedtls_to_psa_error( int ret )
{
/* Mbed TLS error codes can combine a high-level error code and a
* low-level error code. The low-level error usually reflects the
* root cause better, so dispatch on that preferably. */
int low_level_ret = - ( -ret & 0x007f );
switch( low_level_ret != 0 ? low_level_ret : ret )
{
case 0:
return( PSA_SUCCESS );
case MBEDTLS_ERR_AES_INVALID_KEY_LENGTH:
case MBEDTLS_ERR_AES_INVALID_INPUT_LENGTH:
return( PSA_ERROR_NOT_SUPPORTED );
case MBEDTLS_ERR_ASN1_OUT_OF_DATA:
case MBEDTLS_ERR_ASN1_UNEXPECTED_TAG:
case MBEDTLS_ERR_ASN1_INVALID_LENGTH:
case MBEDTLS_ERR_ASN1_LENGTH_MISMATCH:
case MBEDTLS_ERR_ASN1_INVALID_DATA:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_ASN1_ALLOC_FAILED:
return( PSA_ERROR_INSUFFICIENT_MEMORY );
case MBEDTLS_ERR_ASN1_BUF_TOO_SMALL:
return( PSA_ERROR_BUFFER_TOO_SMALL );
#if defined(MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA)
case MBEDTLS_ERR_CAMELLIA_BAD_INPUT_DATA:
#endif
case MBEDTLS_ERR_CAMELLIA_INVALID_INPUT_LENGTH:
return( PSA_ERROR_NOT_SUPPORTED );
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_CHACHA20_BAD_INPUT_DATA:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_CHACHAPOLY_BAD_STATE:
return( PSA_ERROR_BAD_STATE );
case MBEDTLS_ERR_CHACHAPOLY_AUTH_FAILED:
return( PSA_ERROR_INVALID_SIGNATURE );
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_INVALID_ARGUMENT );
case MBEDTLS_ERR_CIPHER_AUTH_FAILED:
return( PSA_ERROR_INVALID_SIGNATURE );
case MBEDTLS_ERR_CIPHER_INVALID_CONTEXT:
return( PSA_ERROR_CORRUPTION_DETECTED );
#if !( defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) || \
defined(MBEDTLS_PSA_HMAC_DRBG_MD_TYPE) )
/* Only check CTR_DRBG error codes if underlying mbedtls_xxx
* functions are passed a CTR_DRBG instance. */
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 );
#endif
case MBEDTLS_ERR_DES_INVALID_INPUT_LENGTH:
return( PSA_ERROR_NOT_SUPPORTED );
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_INVALID_ARGUMENT );
#if !defined(MBEDTLS_PSA_CRYPTO_EXTERNAL_RNG) && \
defined(MBEDTLS_PSA_HMAC_DRBG_MD_TYPE)
/* Only check HMAC_DRBG error codes if underlying mbedtls_xxx
* functions are passed a HMAC_DRBG instance. */
case MBEDTLS_ERR_HMAC_DRBG_ENTROPY_SOURCE_FAILED:
return( PSA_ERROR_INSUFFICIENT_ENTROPY );
case MBEDTLS_ERR_HMAC_DRBG_REQUEST_TOO_BIG:
case MBEDTLS_ERR_HMAC_DRBG_INPUT_TOO_BIG:
return( PSA_ERROR_NOT_SUPPORTED );
case MBEDTLS_ERR_HMAC_DRBG_FILE_IO_ERROR:
return( PSA_ERROR_INSUFFICIENT_ENTROPY );
#endif
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_MPI_FILE_IO_ERROR:
return( PSA_ERROR_STORAGE_FAILURE );
case MBEDTLS_ERR_MPI_BAD_INPUT_DATA:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_MPI_INVALID_CHARACTER:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_MPI_BUFFER_TOO_SMALL:
return( PSA_ERROR_BUFFER_TOO_SMALL );
case MBEDTLS_ERR_MPI_NEGATIVE_VALUE:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_MPI_DIVISION_BY_ZERO:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_MPI_NOT_ACCEPTABLE:
return( PSA_ERROR_INVALID_ARGUMENT );
case MBEDTLS_ERR_MPI_ALLOC_FAILED:
return( PSA_ERROR_INSUFFICIENT_MEMORY );
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_BUFFER_TOO_SMALL:
return( PSA_ERROR_BUFFER_TOO_SMALL );
case MBEDTLS_ERR_PLATFORM_HW_ACCEL_FAILED:
return( PSA_ERROR_HARDWARE_FAILURE );
case MBEDTLS_ERR_PLATFORM_FEATURE_UNSUPPORTED:
return( PSA_ERROR_NOT_SUPPORTED );
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_CORRUPTION_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_ENTROPY );
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_RANDOM_FAILED:
return( PSA_ERROR_INSUFFICIENT_ENTROPY );
case MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED:
return( PSA_ERROR_CORRUPTION_DETECTED );
default:
return( PSA_ERROR_GENERIC_ERROR );
}
}
/****************************************************************/
/* Key management */
/****************************************************************/
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
static inline int psa_key_slot_is_external( const psa_key_slot_t *slot )
{
return( psa_key_lifetime_is_external( slot->attr.lifetime ) );
}
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
/* For now the MBEDTLS_PSA_ACCEL_ guards are also used here since the
* current test driver in key_management.c is using this function
* when accelerators are used for ECC key pair and public key.
* Once that dependency is resolved these guards can be removed.
*/
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) || \
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY) || \
defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_ECC_KEY_PAIR) || \
defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_ECC_PUBLIC_KEY)
mbedtls_ecp_group_id mbedtls_ecc_group_of_psa( psa_ecc_family_t curve,
size_t bits,
int bits_is_sloppy )
{
switch( curve )
{
case PSA_ECC_FAMILY_SECP_R1:
switch( bits )
{
#if defined(PSA_WANT_ECC_SECP_R1_192)
case 192:
return( MBEDTLS_ECP_DP_SECP192R1 );
#endif
#if defined(PSA_WANT_ECC_SECP_R1_224)
case 224:
return( MBEDTLS_ECP_DP_SECP224R1 );
#endif
#if defined(PSA_WANT_ECC_SECP_R1_256)
case 256:
return( MBEDTLS_ECP_DP_SECP256R1 );
#endif
#if defined(PSA_WANT_ECC_SECP_R1_384)
case 384:
return( MBEDTLS_ECP_DP_SECP384R1 );
#endif
#if defined(PSA_WANT_ECC_SECP_R1_521)
case 521:
return( MBEDTLS_ECP_DP_SECP521R1 );
case 528:
if( bits_is_sloppy )
return( MBEDTLS_ECP_DP_SECP521R1 );
break;
#endif
}
break;
case PSA_ECC_FAMILY_BRAINPOOL_P_R1:
switch( bits )
{
#if defined(PSA_WANT_ECC_BRAINPOOL_P_R1_256)
case 256:
return( MBEDTLS_ECP_DP_BP256R1 );
#endif
#if defined(PSA_WANT_ECC_BRAINPOOL_P_R1_384)
case 384:
return( MBEDTLS_ECP_DP_BP384R1 );
#endif
#if defined(PSA_WANT_ECC_BRAINPOOL_P_R1_512)
case 512:
return( MBEDTLS_ECP_DP_BP512R1 );
#endif
}
break;
case PSA_ECC_FAMILY_MONTGOMERY:
switch( bits )
{
#if defined(PSA_WANT_ECC_MONTGOMERY_255)
case 255:
return( MBEDTLS_ECP_DP_CURVE25519 );
case 256:
if( bits_is_sloppy )
return( MBEDTLS_ECP_DP_CURVE25519 );
break;
#endif
#if defined(PSA_WANT_ECC_MONTGOMERY_448)
case 448:
return( MBEDTLS_ECP_DP_CURVE448 );
#endif
}
break;
case PSA_ECC_FAMILY_SECP_K1:
switch( bits )
{
#if defined(PSA_WANT_ECC_SECP_K1_192)
case 192:
return( MBEDTLS_ECP_DP_SECP192K1 );
#endif
#if defined(PSA_WANT_ECC_SECP_K1_224)
case 224:
return( MBEDTLS_ECP_DP_SECP224K1 );
#endif
#if defined(PSA_WANT_ECC_SECP_K1_256)
case 256:
return( MBEDTLS_ECP_DP_SECP256K1 );
#endif
}
break;
}
(void) bits_is_sloppy;
return( MBEDTLS_ECP_DP_NONE );
}
#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) ||
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY) ||
* defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_ECC_KEY_PAIR) ||
* defined(MBEDTLS_PSA_ACCEL_KEY_TYPE_ECC_PUBLIC_KEY) */
static psa_status_t validate_unstructured_key_bit_size( psa_key_type_t type,
size_t bits )
{
/* Check that the bit size is acceptable for the key type */
switch( type )
{
case PSA_KEY_TYPE_RAW_DATA:
case PSA_KEY_TYPE_HMAC:
case PSA_KEY_TYPE_DERIVE:
break;
#if defined(PSA_WANT_KEY_TYPE_AES)
case PSA_KEY_TYPE_AES:
if( bits != 128 && bits != 192 && bits != 256 )
return( PSA_ERROR_INVALID_ARGUMENT );
break;
#endif
#if defined(PSA_WANT_KEY_TYPE_CAMELLIA)
case PSA_KEY_TYPE_CAMELLIA:
if( bits != 128 && bits != 192 && bits != 256 )
return( PSA_ERROR_INVALID_ARGUMENT );
break;
#endif
#if defined(PSA_WANT_KEY_TYPE_DES)
case PSA_KEY_TYPE_DES:
if( bits != 64 && bits != 128 && bits != 192 )
return( PSA_ERROR_INVALID_ARGUMENT );
break;
#endif
#if defined(PSA_WANT_KEY_TYPE_CHACHA20)
case PSA_KEY_TYPE_CHACHA20:
if( bits != 256 )
return( PSA_ERROR_INVALID_ARGUMENT );
break;
#endif
default:
return( PSA_ERROR_NOT_SUPPORTED );
}
if( bits % 8 != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
return( PSA_SUCCESS );
}
/** Check whether a given key type is valid for use with a given MAC algorithm
*
* Upon successful return of this function, the behavior of #PSA_MAC_LENGTH
* when called with the validated \p algorithm and \p key_type is well-defined.
*
* \param[in] algorithm The specific MAC algorithm (can be wildcard).
* \param[in] key_type The key type of the key to be used with the
* \p algorithm.
*
* \retval #PSA_SUCCESS
* The \p key_type is valid for use with the \p algorithm
* \retval #PSA_ERROR_INVALID_ARGUMENT
* The \p key_type is not valid for use with the \p algorithm
*/
MBEDTLS_STATIC_TESTABLE psa_status_t psa_mac_key_can_do(
psa_algorithm_t algorithm,
psa_key_type_t key_type )
{
if( PSA_ALG_IS_HMAC( algorithm ) )
{
if( key_type == PSA_KEY_TYPE_HMAC )
return( PSA_SUCCESS );
}
if( PSA_ALG_IS_BLOCK_CIPHER_MAC( algorithm ) )
{
/* Check that we're calling PSA_BLOCK_CIPHER_BLOCK_LENGTH with a cipher
* key. */
if( ( key_type & PSA_KEY_TYPE_CATEGORY_MASK ) ==
PSA_KEY_TYPE_CATEGORY_SYMMETRIC )
{
/* PSA_BLOCK_CIPHER_BLOCK_LENGTH returns 1 for stream ciphers and
* the block length (larger than 1) for block ciphers. */
if( PSA_BLOCK_CIPHER_BLOCK_LENGTH( key_type ) > 1 )
return( PSA_SUCCESS );
}
}
return( PSA_ERROR_INVALID_ARGUMENT );
}
psa_status_t psa_allocate_buffer_to_slot( psa_key_slot_t *slot,
size_t buffer_length )
{
if( slot->key.data != NULL )
return( PSA_ERROR_ALREADY_EXISTS );
slot->key.data = mbedtls_calloc( 1, buffer_length );
if( slot->key.data == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
slot->key.bytes = buffer_length;
return( PSA_SUCCESS );
}
psa_status_t psa_copy_key_material_into_slot( psa_key_slot_t *slot,
const uint8_t* data,
size_t data_length )
{
psa_status_t status = psa_allocate_buffer_to_slot( slot,
data_length );
if( status != PSA_SUCCESS )
return( status );
memcpy( slot->key.data, data, data_length );
return( PSA_SUCCESS );
}
psa_status_t psa_import_key_into_slot(
const psa_key_attributes_t *attributes,
const uint8_t *data, size_t data_length,
uint8_t *key_buffer, size_t key_buffer_size,
size_t *key_buffer_length, size_t *bits )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_type_t type = attributes->core.type;
/* zero-length keys are never supported. */
if( data_length == 0 )
return( PSA_ERROR_NOT_SUPPORTED );
if( key_type_is_raw_bytes( type ) )
{
*bits = PSA_BYTES_TO_BITS( data_length );
/* Ensure that the bytes-to-bits conversion hasn't overflown. */
if( data_length > SIZE_MAX / 8 )
return( PSA_ERROR_NOT_SUPPORTED );
/* Enforce a size limit, and in particular ensure that the bit
* size fits in its representation type. */
if( ( *bits ) > PSA_MAX_KEY_BITS )
return( PSA_ERROR_NOT_SUPPORTED );
status = validate_unstructured_key_bit_size( type, *bits );
if( status != PSA_SUCCESS )
return( status );
/* Copy the key material. */
memcpy( key_buffer, data, data_length );
*key_buffer_length = data_length;
(void)key_buffer_size;
return( PSA_SUCCESS );
}
else if( PSA_KEY_TYPE_IS_ASYMMETRIC( type ) )
{
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) || \
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY)
if( PSA_KEY_TYPE_IS_ECC( type ) )
{
return( mbedtls_psa_ecp_import_key( attributes,
data, data_length,
key_buffer, key_buffer_size,
key_buffer_length,
bits ) );
}
#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) ||
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY) */
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
if( PSA_KEY_TYPE_IS_RSA( type ) )
{
return( mbedtls_psa_rsa_import_key( attributes,
data, data_length,
key_buffer, key_buffer_size,
key_buffer_length,
bits ) );
}
#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) ||
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */
}
return( PSA_ERROR_NOT_SUPPORTED );
}
/** Calculate the intersection of two algorithm usage policies.
*
* Return 0 (which allows no operation) on incompatibility.
*/
static psa_algorithm_t psa_key_policy_algorithm_intersection(
psa_key_type_t key_type,
psa_algorithm_t alg1,
psa_algorithm_t alg2 )
{
/* Common case: both sides actually specify the same policy. */
if( alg1 == alg2 )
return( alg1 );
/* If the policies are from the same hash-and-sign family, check
* if one is a wildcard. If so the other has the specific algorithm. */
if( PSA_ALG_IS_HASH_AND_SIGN( alg1 ) &&
PSA_ALG_IS_HASH_AND_SIGN( alg2 ) &&
( alg1 & ~PSA_ALG_HASH_MASK ) == ( alg2 & ~PSA_ALG_HASH_MASK ) )
{
if( PSA_ALG_SIGN_GET_HASH( alg1 ) == PSA_ALG_ANY_HASH )
return( alg2 );
if( PSA_ALG_SIGN_GET_HASH( alg2 ) == PSA_ALG_ANY_HASH )
return( alg1 );
}
/* If the policies are from the same AEAD family, check whether
* one of them is a minimum-tag-length wildcard. Calculate the most
* restrictive tag length. */
if( PSA_ALG_IS_AEAD( alg1 ) && PSA_ALG_IS_AEAD( alg2 ) &&
( PSA_ALG_AEAD_WITH_SHORTENED_TAG( alg1, 0 ) ==
PSA_ALG_AEAD_WITH_SHORTENED_TAG( alg2, 0 ) ) )
{
size_t alg1_len = PSA_ALG_AEAD_GET_TAG_LENGTH( alg1 );
size_t alg2_len = PSA_ALG_AEAD_GET_TAG_LENGTH( alg2 );
size_t restricted_len = alg1_len > alg2_len ? alg1_len : alg2_len;
/* If both are wildcards, return most restrictive wildcard */
if( ( ( alg1 & PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG ) != 0 ) &&
( ( alg2 & PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG ) != 0 ) )
{
return( PSA_ALG_AEAD_WITH_AT_LEAST_THIS_LENGTH_TAG(
alg1, restricted_len ) );
}
/* If only one is a wildcard, return specific algorithm if compatible. */
if( ( ( alg1 & PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG ) != 0 ) &&
( alg1_len <= alg2_len ) )
{
return( alg2 );
}
if( ( ( alg2 & PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG ) != 0 ) &&
( alg2_len <= alg1_len ) )
{
return( alg1 );
}
}
/* If the policies are from the same MAC family, check whether one
* of them is a minimum-MAC-length policy. Calculate the most
* restrictive tag length. */
if( PSA_ALG_IS_MAC( alg1 ) && PSA_ALG_IS_MAC( alg2 ) &&
( PSA_ALG_FULL_LENGTH_MAC( alg1 ) ==
PSA_ALG_FULL_LENGTH_MAC( alg2 ) ) )
{
/* Validate the combination of key type and algorithm. Since the base
* algorithm of alg1 and alg2 are the same, we only need this once. */
if( PSA_SUCCESS != psa_mac_key_can_do( alg1, key_type ) )
return( 0 );
/* Get the (exact or at-least) output lengths for both sides of the
* requested intersection. None of the currently supported algorithms
* have an output length dependent on the actual key size, so setting it
* to a bogus value of 0 is currently OK.
*
* Note that for at-least-this-length wildcard algorithms, the output
* length is set to the shortest allowed length, which allows us to
* calculate the most restrictive tag length for the intersection. */
size_t alg1_len = PSA_MAC_LENGTH( key_type, 0, alg1 );
size_t alg2_len = PSA_MAC_LENGTH( key_type, 0, alg2 );
size_t restricted_len = alg1_len > alg2_len ? alg1_len : alg2_len;
/* If both are wildcards, return most restrictive wildcard */
if( ( ( alg1 & PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG ) != 0 ) &&
( ( alg2 & PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG ) != 0 ) )
{
return( PSA_ALG_AT_LEAST_THIS_LENGTH_MAC( alg1, restricted_len ) );
}
/* If only one is an at-least-this-length policy, the intersection would
* be the other (fixed-length) policy as long as said fixed length is
* equal to or larger than the shortest allowed length. */
if( ( alg1 & PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG ) != 0 )
{
return( ( alg1_len <= alg2_len ) ? alg2 : 0 );
}
if( ( alg2 & PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG ) != 0 )
{
return( ( alg2_len <= alg1_len ) ? alg1 : 0 );
}
/* If none of them are wildcards, check whether they define the same tag
* length. This is still possible here when one is default-length and
* the other specific-length. Ensure to always return the
* specific-length version for the intersection. */
if( alg1_len == alg2_len )
return( PSA_ALG_TRUNCATED_MAC( alg1, alg1_len ) );
}
/* If the policies are incompatible, allow nothing. */
return( 0 );
}
static int psa_key_algorithm_permits( psa_key_type_t key_type,
psa_algorithm_t policy_alg,
psa_algorithm_t requested_alg )
{
/* Common case: the policy only allows requested_alg. */
if( requested_alg == policy_alg )
return( 1 );
/* If policy_alg is a hash-and-sign with a wildcard for the hash,
* and requested_alg is the same hash-and-sign family with any hash,
* then requested_alg is compliant with policy_alg. */
if( PSA_ALG_IS_HASH_AND_SIGN( requested_alg ) &&
PSA_ALG_SIGN_GET_HASH( policy_alg ) == PSA_ALG_ANY_HASH )
{
return( ( policy_alg & ~PSA_ALG_HASH_MASK ) ==
( requested_alg & ~PSA_ALG_HASH_MASK ) );
}
/* If policy_alg is a wildcard AEAD algorithm of the same base as
* the requested algorithm, check the requested tag length to be
* equal-length or longer than the wildcard-specified length. */
if( PSA_ALG_IS_AEAD( policy_alg ) &&
PSA_ALG_IS_AEAD( requested_alg ) &&
( PSA_ALG_AEAD_WITH_SHORTENED_TAG( policy_alg, 0 ) ==
PSA_ALG_AEAD_WITH_SHORTENED_TAG( requested_alg, 0 ) ) &&
( ( policy_alg & PSA_ALG_AEAD_AT_LEAST_THIS_LENGTH_FLAG ) != 0 ) )
{
return( PSA_ALG_AEAD_GET_TAG_LENGTH( policy_alg ) <=
PSA_ALG_AEAD_GET_TAG_LENGTH( requested_alg ) );
}
/* If policy_alg is a MAC algorithm of the same base as the requested
* algorithm, check whether their MAC lengths are compatible. */
if( PSA_ALG_IS_MAC( policy_alg ) &&
PSA_ALG_IS_MAC( requested_alg ) &&
( PSA_ALG_FULL_LENGTH_MAC( policy_alg ) ==
PSA_ALG_FULL_LENGTH_MAC( requested_alg ) ) )
{
/* Validate the combination of key type and algorithm. Since the policy
* and requested algorithms are the same, we only need this once. */
if( PSA_SUCCESS != psa_mac_key_can_do( policy_alg, key_type ) )
return( 0 );
/* Get both the requested output length for the algorithm which is to be
* verified, and the default output length for the base algorithm.
* Note that none of the currently supported algorithms have an output
* length dependent on actual key size, so setting it to a bogus value
* of 0 is currently OK. */
size_t requested_output_length = PSA_MAC_LENGTH(
key_type, 0, requested_alg );
size_t default_output_length = PSA_MAC_LENGTH(
key_type, 0,
PSA_ALG_FULL_LENGTH_MAC( requested_alg ) );
/* If the policy is default-length, only allow an algorithm with
* a declared exact-length matching the default. */
if( PSA_MAC_TRUNCATED_LENGTH( policy_alg ) == 0 )
return( requested_output_length == default_output_length );
/* If the requested algorithm is default-length, allow it if the policy
* length exactly matches the default length. */
if( PSA_MAC_TRUNCATED_LENGTH( requested_alg ) == 0 &&
PSA_MAC_TRUNCATED_LENGTH( policy_alg ) == default_output_length )
{
return( 1 );
}
/* If policy_alg is an at-least-this-length wildcard MAC algorithm,
* check for the requested MAC length to be equal to or longer than the
* minimum allowed length. */
if( ( policy_alg & PSA_ALG_MAC_AT_LEAST_THIS_LENGTH_FLAG ) != 0 )
{
return( PSA_MAC_TRUNCATED_LENGTH( policy_alg ) <=
requested_output_length );
}
}
/* If policy_alg is a generic key agreement operation, then using it for
* a key derivation with that key agreement should also be allowed. This
* behaviour is expected to be defined in a future specification version. */
if( PSA_ALG_IS_RAW_KEY_AGREEMENT( policy_alg ) &&
PSA_ALG_IS_KEY_AGREEMENT( requested_alg ) )
{
return( PSA_ALG_KEY_AGREEMENT_GET_BASE( requested_alg ) ==
policy_alg );
}
/* If it isn't explicitly permitted, it's forbidden. */
return( 0 );
}
/** Test whether a policy permits an algorithm.
*
* The caller must test usage flags separately.
*
* \note This function requires providing the key type for which the policy is
* being validated, since some algorithm policy definitions (e.g. MAC)
* have different properties depending on what kind of cipher it is
* combined with.
*
* \retval PSA_SUCCESS When \p alg is a specific algorithm
* allowed by the \p policy.
* \retval PSA_ERROR_INVALID_ARGUMENT When \p alg is not a specific algorithm
* \retval PSA_ERROR_NOT_PERMITTED When \p alg is a specific algorithm, but
* the \p policy does not allow it.
*/
static psa_status_t psa_key_policy_permits( const psa_key_policy_t *policy,
psa_key_type_t key_type,
psa_algorithm_t alg )
{
/* '0' is not a valid algorithm */
if( alg == 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
/* A requested algorithm cannot be a wildcard. */
if( PSA_ALG_IS_WILDCARD( alg ) )
return( PSA_ERROR_INVALID_ARGUMENT );
if( psa_key_algorithm_permits( key_type, policy->alg, alg ) ||
psa_key_algorithm_permits( key_type, policy->alg2, alg ) )
return( PSA_SUCCESS );
else
return( PSA_ERROR_NOT_PERMITTED );
}
/** Restrict a key policy based on a constraint.
*
* \note This function requires providing the key type for which the policy is
* being restricted, since some algorithm policy definitions (e.g. MAC)
* have different properties depending on what kind of cipher it is
* combined with.
*
* \param[in] key_type The key type for which to restrict the policy
* \param[in,out] policy The policy to restrict.
* \param[in] constraint The policy constraint to apply.
*
* \retval #PSA_SUCCESS
* \c *policy contains the intersection of the original value of
* \c *policy and \c *constraint.
* \retval #PSA_ERROR_INVALID_ARGUMENT
* \c key_type, \c *policy and \c *constraint are incompatible.
* \c *policy is unchanged.
*/
static psa_status_t psa_restrict_key_policy(
psa_key_type_t key_type,
psa_key_policy_t *policy,
const psa_key_policy_t *constraint )
{
psa_algorithm_t intersection_alg =
psa_key_policy_algorithm_intersection( key_type, policy->alg,
constraint->alg );
psa_algorithm_t intersection_alg2 =
psa_key_policy_algorithm_intersection( key_type, policy->alg2,
constraint->alg2 );
if( intersection_alg == 0 && policy->alg != 0 && constraint->alg != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
if( intersection_alg2 == 0 && policy->alg2 != 0 && constraint->alg2 != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
policy->usage &= constraint->usage;
policy->alg = intersection_alg;
policy->alg2 = intersection_alg2;
return( PSA_SUCCESS );
}
/** Get the description of a key given its identifier and policy constraints
* and lock it.
*
* The key must have allow all the usage flags set in \p usage. If \p alg is
* nonzero, the key must allow operations with this algorithm. If \p alg is
* zero, the algorithm is not checked.
*
* In case of a persistent key, the function loads the description of the key
* into a key slot if not already done.
*
* On success, the returned key slot is locked. It is the responsibility of
* the caller to unlock the key slot when it does not access it anymore.
*/
static psa_status_t psa_get_and_lock_key_slot_with_policy(
mbedtls_svc_key_id_t key,
psa_key_slot_t **p_slot,
psa_key_usage_t usage,
psa_algorithm_t alg )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_slot_t *slot;
status = psa_get_and_lock_key_slot( key, p_slot );
if( status != PSA_SUCCESS )
return( status );
slot = *p_slot;
/* Enforce that usage policy for the key slot contains all the flags
* required by the usage parameter. There is one exception: public
* keys can always be exported, so we treat public key objects as
* if they had the export flag. */
if( PSA_KEY_TYPE_IS_PUBLIC_KEY( slot->attr.type ) )
usage &= ~PSA_KEY_USAGE_EXPORT;
if( ( slot->attr.policy.usage & usage ) != usage )
{
status = PSA_ERROR_NOT_PERMITTED;
goto error;
}
/* Enforce that the usage policy permits the requested algortihm. */
if( alg != 0 )
{
status = psa_key_policy_permits( &slot->attr.policy,
slot->attr.type,
alg );
if( status != PSA_SUCCESS )
goto error;
}
return( PSA_SUCCESS );
error:
*p_slot = NULL;
psa_unlock_key_slot( slot );
return( status );
}
/** Get a key slot containing a transparent key and lock it.
*
* A transparent key is a key for which the key material is directly
* available, as opposed to a key in a secure element.
*
* This is a temporary function to use instead of
* psa_get_and_lock_key_slot_with_policy() until secure element support is
* fully implemented.
*
* On success, the returned key slot is locked. It is the responsibility of the
* caller to unlock the key slot when it does not access it anymore.
*/
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
static psa_status_t psa_get_and_lock_transparent_key_slot_with_policy(
mbedtls_svc_key_id_t key,
psa_key_slot_t **p_slot,
psa_key_usage_t usage,
psa_algorithm_t alg )
{
psa_status_t status = psa_get_and_lock_key_slot_with_policy( key, p_slot,
usage, alg );
if( status != PSA_SUCCESS )
return( status );
if( psa_key_slot_is_external( *p_slot ) )
{
psa_unlock_key_slot( *p_slot );
*p_slot = NULL;
return( PSA_ERROR_NOT_SUPPORTED );
}
return( PSA_SUCCESS );
}
#else /* MBEDTLS_PSA_CRYPTO_SE_C */
/* With no secure element support, all keys are transparent. */
#define psa_get_and_lock_transparent_key_slot_with_policy( key, p_slot, usage, alg ) \
psa_get_and_lock_key_slot_with_policy( key, p_slot, usage, alg )
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
psa_status_t psa_remove_key_data_from_memory( psa_key_slot_t *slot )
{
/* Data pointer will always be either a valid pointer or NULL in an
* initialized slot, so we can just free it. */
if( slot->key.data != NULL )
mbedtls_platform_zeroize( slot->key.data, slot->key.bytes);
mbedtls_free( slot->key.data );
slot->key.data = NULL;
slot->key.bytes = 0;
return( PSA_SUCCESS );
}
/** Completely wipe a slot in memory, including its policy.
* Persistent storage is not affected. */
psa_status_t psa_wipe_key_slot( psa_key_slot_t *slot )
{
psa_status_t status = psa_remove_key_data_from_memory( slot );
if( slot->lock_count != 1 )
{
status = PSA_ERROR_CORRUPTION_DETECTED;
}
/* Multipart operations may still be using the key. This is safe
* because all multipart operation objects are independent from
* the key slot: if they need to access the key after the setup
* phase, they have a copy of the key. Note that this means that
* key material can linger until all operations are completed. */
/* At this point, key material and other type-specific content has
* been wiped. Clear remaining metadata. We can call memset and not
* zeroize because the metadata is not particularly sensitive. */
memset( slot, 0, sizeof( *slot ) );
return( status );
}
psa_status_t psa_destroy_key( mbedtls_svc_key_id_t key )
{
psa_key_slot_t *slot;
psa_status_t status; /* status of the last operation */
psa_status_t overall_status = PSA_SUCCESS;
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
psa_se_drv_table_entry_t *driver;
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
if( mbedtls_svc_key_id_is_null( key ) )
return( PSA_SUCCESS );
/*
* Get the description of the key in a key slot. In case of a persistent
* key, this will load the key description from persistent memory if not
* done yet. We cannot avoid this loading as without it we don't know if
* the key is operated by an SE or not and this information is needed by
* the current implementation.
*/
status = psa_get_and_lock_key_slot( key, &slot );
if( status != PSA_SUCCESS )
return( status );
/*
* If the key slot containing the key description is under access by the
* library (apart from the present access), the key cannot be destroyed
* yet. For the time being, just return in error. Eventually (to be
* implemented), the key should be destroyed when all accesses have
* stopped.
*/
if( slot->lock_count > 1 )
{
psa_unlock_key_slot( slot );
return( PSA_ERROR_GENERIC_ERROR );
}
if( PSA_KEY_LIFETIME_IS_READ_ONLY( slot->attr.lifetime ) )
{
/* Refuse the destruction of a read-only key (which may or may not work
* if we attempt it, depending on whether the key is merely read-only
* by policy or actually physically read-only).
* Just do the best we can, which is to wipe the copy in memory
* (done in this function's cleanup code). */
overall_status = PSA_ERROR_NOT_PERMITTED;
goto exit;
}
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
driver = psa_get_se_driver_entry( slot->attr.lifetime );
if( driver != NULL )
{
/* For a key in a secure element, we need to do three things:
* remove the key file in internal storage, destroy the
* key inside the secure element, and update the driver's
* persistent data. Start a transaction that will encompass these
* three actions. */
psa_crypto_prepare_transaction( PSA_CRYPTO_TRANSACTION_DESTROY_KEY );
psa_crypto_transaction.key.lifetime = slot->attr.lifetime;
psa_crypto_transaction.key.slot = psa_key_slot_get_slot_number( slot );
psa_crypto_transaction.key.id = slot->attr.id;
status = psa_crypto_save_transaction( );
if( status != PSA_SUCCESS )
{
(void) psa_crypto_stop_transaction( );
/* We should still try to destroy the key in the secure
* element and the key metadata in storage. This is especially
* important if the error is that the storage is full.
* But how to do it exactly without risking an inconsistent
* state after a reset?
* https://github.com/ARMmbed/mbed-crypto/issues/215
*/
overall_status = status;
goto exit;
}
status = psa_destroy_se_key( driver,
psa_key_slot_get_slot_number( slot ) );
if( overall_status == PSA_SUCCESS )
overall_status = status;
}
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
if( ! PSA_KEY_LIFETIME_IS_VOLATILE( slot->attr.lifetime ) )
{
status = psa_destroy_persistent_key( slot->attr.id );
if( overall_status == PSA_SUCCESS )
overall_status = status;
/* TODO: other slots may have a copy of the same key. We should
* invalidate them.
* https://github.com/ARMmbed/mbed-crypto/issues/214
*/
}
#endif /* defined(MBEDTLS_PSA_CRYPTO_STORAGE_C) */
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
if( driver != NULL )
{
status = psa_save_se_persistent_data( driver );
if( overall_status == PSA_SUCCESS )
overall_status = status;
status = psa_crypto_stop_transaction( );
if( overall_status == PSA_SUCCESS )
overall_status = status;
}
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
exit:
status = psa_wipe_key_slot( slot );
/* Prioritize CORRUPTION_DETECTED from wiping over a storage error */
if( status != PSA_SUCCESS )
overall_status = status;
return( overall_status );
}
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
static psa_status_t psa_get_rsa_public_exponent(
const mbedtls_rsa_context *rsa,
psa_key_attributes_t *attributes )
{
mbedtls_mpi mpi;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
uint8_t *buffer = NULL;
size_t buflen;
mbedtls_mpi_init( &mpi );
ret = mbedtls_rsa_export( rsa, NULL, NULL, NULL, NULL, &mpi );
if( ret != 0 )
goto exit;
if( mbedtls_mpi_cmp_int( &mpi, 65537 ) == 0 )
{
/* It's the default value, which is reported as an empty string,
* so there's nothing to do. */
goto exit;
}
buflen = mbedtls_mpi_size( &mpi );
buffer = mbedtls_calloc( 1, buflen );
if( buffer == NULL )
{
ret = MBEDTLS_ERR_MPI_ALLOC_FAILED;
goto exit;
}
ret = mbedtls_mpi_write_binary( &mpi, buffer, buflen );
if( ret != 0 )
goto exit;
attributes->domain_parameters = buffer;
attributes->domain_parameters_size = buflen;
exit:
mbedtls_mpi_free( &mpi );
if( ret != 0 )
mbedtls_free( buffer );
return( mbedtls_to_psa_error( ret ) );
}
#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) ||
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */
/** Retrieve all the publicly-accessible attributes of a key.
*/
psa_status_t psa_get_key_attributes( mbedtls_svc_key_id_t key,
psa_key_attributes_t *attributes )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_slot_t *slot;
psa_reset_key_attributes( attributes );
status = psa_get_and_lock_key_slot_with_policy( key, &slot, 0, 0 );
if( status != PSA_SUCCESS )
return( status );
attributes->core = slot->attr;
attributes->core.flags &= ( MBEDTLS_PSA_KA_MASK_EXTERNAL_ONLY |
MBEDTLS_PSA_KA_MASK_DUAL_USE );
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
if( psa_key_slot_is_external( slot ) )
psa_set_key_slot_number( attributes,
psa_key_slot_get_slot_number( slot ) );
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
switch( slot->attr.type )
{
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
case PSA_KEY_TYPE_RSA_KEY_PAIR:
case PSA_KEY_TYPE_RSA_PUBLIC_KEY:
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
/* TODO: reporting the public exponent for opaque keys
* is not yet implemented.
* https://github.com/ARMmbed/mbed-crypto/issues/216
*/
if( psa_key_slot_is_external( slot ) )
break;
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
{
mbedtls_rsa_context *rsa = NULL;
status = mbedtls_psa_rsa_load_representation(
slot->attr.type,
slot->key.data,
slot->key.bytes,
&rsa );
if( status != PSA_SUCCESS )
break;
status = psa_get_rsa_public_exponent( rsa,
attributes );
mbedtls_rsa_free( rsa );
mbedtls_free( rsa );
}
break;
#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) ||
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */
default:
/* Nothing else to do. */
break;
}
if( status != PSA_SUCCESS )
psa_reset_key_attributes( attributes );
unlock_status = psa_unlock_key_slot( slot );
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
}
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
psa_status_t psa_get_key_slot_number(
const psa_key_attributes_t *attributes,
psa_key_slot_number_t *slot_number )
{
if( attributes->core.flags & MBEDTLS_PSA_KA_FLAG_HAS_SLOT_NUMBER )
{
*slot_number = attributes->slot_number;
return( PSA_SUCCESS );
}
else
return( PSA_ERROR_INVALID_ARGUMENT );
}
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
static psa_status_t psa_export_key_buffer_internal( const uint8_t *key_buffer,
size_t key_buffer_size,
uint8_t *data,
size_t data_size,
size_t *data_length )
{
if( key_buffer_size > data_size )
return( PSA_ERROR_BUFFER_TOO_SMALL );
memcpy( data, key_buffer, key_buffer_size );
memset( data + key_buffer_size, 0,
data_size - key_buffer_size );
*data_length = key_buffer_size;
return( PSA_SUCCESS );
}
psa_status_t psa_export_key_internal(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
uint8_t *data, size_t data_size, size_t *data_length )
{
psa_key_type_t type = attributes->core.type;
if( key_type_is_raw_bytes( type ) ||
PSA_KEY_TYPE_IS_RSA( type ) ||
PSA_KEY_TYPE_IS_ECC( type ) )
{
return( psa_export_key_buffer_internal(
key_buffer, key_buffer_size,
data, data_size, data_length ) );
}
else
{
/* 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( mbedtls_svc_key_id_t key,
uint8_t *data,
size_t data_size,
size_t *data_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_slot_t *slot;
/* Reject a zero-length output buffer now, since this can never be a
* valid key representation. This way we know that data must be a valid
* pointer and we can do things like memset(data, ..., data_size). */
if( data_size == 0 )
return( PSA_ERROR_BUFFER_TOO_SMALL );
/* Set the key to empty now, so that even when there are errors, we always
* set data_length to a value between 0 and data_size. On error, setting
* the key to empty is a good choice because an empty key representation is
* unlikely to be accepted anywhere. */
*data_length = 0;
/* Export requires the EXPORT flag. There is an exception for public keys,
* which don't require any flag, but
* psa_get_and_lock_key_slot_with_policy() takes care of this.
*/
status = psa_get_and_lock_key_slot_with_policy( key, &slot,
PSA_KEY_USAGE_EXPORT, 0 );
if( status != PSA_SUCCESS )
return( status );
psa_key_attributes_t attributes = {
.core = slot->attr
};
status = psa_driver_wrapper_export_key( &attributes,
slot->key.data, slot->key.bytes,
data, data_size, data_length );
unlock_status = psa_unlock_key_slot( slot );
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
}
psa_status_t psa_export_public_key_internal(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer,
size_t key_buffer_size,
uint8_t *data,
size_t data_size,
size_t *data_length )
{
psa_key_type_t type = attributes->core.type;
if( PSA_KEY_TYPE_IS_RSA( type ) || PSA_KEY_TYPE_IS_ECC( type ) )
{
if( PSA_KEY_TYPE_IS_PUBLIC_KEY( type ) )
{
/* Exporting public -> public */
return( psa_export_key_buffer_internal(
key_buffer, key_buffer_size,
data, data_size, data_length ) );
}
if( PSA_KEY_TYPE_IS_RSA( type ) )
{
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
return( mbedtls_psa_rsa_export_public_key( attributes,
key_buffer,
key_buffer_size,
data,
data_size,
data_length ) );
#else
/* We don't know how to convert a private RSA key to public. */
return( PSA_ERROR_NOT_SUPPORTED );
#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) ||
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */
}
else
{
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) || \
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY)
return( mbedtls_psa_ecp_export_public_key( attributes,
key_buffer,
key_buffer_size,
data,
data_size,
data_length ) );
#else
/* We don't know how to convert a private ECC key to public */
return( PSA_ERROR_NOT_SUPPORTED );
#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) ||
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY) */
}
}
else
{
/* 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_public_key( mbedtls_svc_key_id_t key,
uint8_t *data,
size_t data_size,
size_t *data_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_slot_t *slot;
/* Reject a zero-length output buffer now, since this can never be a
* valid key representation. This way we know that data must be a valid
* pointer and we can do things like memset(data, ..., data_size). */
if( data_size == 0 )
return( PSA_ERROR_BUFFER_TOO_SMALL );
/* Set the key to empty now, so that even when there are errors, we always
* set data_length to a value between 0 and data_size. On error, setting
* the key to empty is a good choice because an empty key representation is
* unlikely to be accepted anywhere. */
*data_length = 0;
/* Exporting a public key doesn't require a usage flag. */
status = psa_get_and_lock_key_slot_with_policy( key, &slot, 0, 0 );
if( status != PSA_SUCCESS )
return( status );
if( ! PSA_KEY_TYPE_IS_ASYMMETRIC( slot->attr.type ) )
{
status = PSA_ERROR_INVALID_ARGUMENT;
goto exit;
}
psa_key_attributes_t attributes = {
.core = slot->attr
};
status = psa_driver_wrapper_export_public_key(
&attributes, slot->key.data, slot->key.bytes,
data, data_size, data_length );
exit:
unlock_status = psa_unlock_key_slot( slot );
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
}
#if defined(static_assert)
static_assert( ( MBEDTLS_PSA_KA_MASK_EXTERNAL_ONLY & MBEDTLS_PSA_KA_MASK_DUAL_USE ) == 0,
"One or more key attribute flag is listed as both external-only and dual-use" );
static_assert( ( PSA_KA_MASK_INTERNAL_ONLY & MBEDTLS_PSA_KA_MASK_DUAL_USE ) == 0,
"One or more key attribute flag is listed as both internal-only and dual-use" );
static_assert( ( PSA_KA_MASK_INTERNAL_ONLY & MBEDTLS_PSA_KA_MASK_EXTERNAL_ONLY ) == 0,
"One or more key attribute flag is listed as both internal-only and external-only" );
#endif
/** Validate that a key policy is internally well-formed.
*
* This function only rejects invalid policies. It does not validate the
* consistency of the policy with respect to other attributes of the key
* such as the key type.
*/
static psa_status_t psa_validate_key_policy( const psa_key_policy_t *policy )
{
if( ( policy->usage & ~( PSA_KEY_USAGE_EXPORT |
PSA_KEY_USAGE_COPY |
PSA_KEY_USAGE_ENCRYPT |
PSA_KEY_USAGE_DECRYPT |
PSA_KEY_USAGE_SIGN_MESSAGE |
PSA_KEY_USAGE_VERIFY_MESSAGE |
PSA_KEY_USAGE_SIGN_HASH |
PSA_KEY_USAGE_VERIFY_HASH |
PSA_KEY_USAGE_VERIFY_DERIVATION |
PSA_KEY_USAGE_DERIVE ) ) != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
return( PSA_SUCCESS );
}
/** Validate the internal consistency of key attributes.
*
* This function only rejects invalid attribute values. If does not
* validate the consistency of the attributes with any key data that may
* be involved in the creation of the key.
*
* Call this function early in the key creation process.
*
* \param[in] attributes Key attributes for the new key.
* \param[out] p_drv On any return, the driver for the key, if any.
* NULL for a transparent key.
*
*/
static psa_status_t psa_validate_key_attributes(
const psa_key_attributes_t *attributes,
psa_se_drv_table_entry_t **p_drv )
{
psa_status_t status = PSA_ERROR_INVALID_ARGUMENT;
psa_key_lifetime_t lifetime = psa_get_key_lifetime( attributes );
mbedtls_svc_key_id_t key = psa_get_key_id( attributes );
status = psa_validate_key_location( lifetime, p_drv );
if( status != PSA_SUCCESS )
return( status );
status = psa_validate_key_persistence( lifetime );
if( status != PSA_SUCCESS )
return( status );
if ( PSA_KEY_LIFETIME_IS_VOLATILE( lifetime ) )
{
if( MBEDTLS_SVC_KEY_ID_GET_KEY_ID( key ) != 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
}
else
{
if( !psa_is_valid_key_id( psa_get_key_id( attributes ), 0 ) )
return( PSA_ERROR_INVALID_ARGUMENT );
}
status = psa_validate_key_policy( &attributes->core.policy );
if( status != PSA_SUCCESS )
return( status );
/* Refuse to create overly large keys.
* Note that this doesn't trigger on import if the attributes don't
* explicitly specify a size (so psa_get_key_bits returns 0), so
* psa_import_key() needs its own checks. */
if( psa_get_key_bits( attributes ) > PSA_MAX_KEY_BITS )
return( PSA_ERROR_NOT_SUPPORTED );
/* Reject invalid flags. These should not be reachable through the API. */
if( attributes->core.flags & ~ ( MBEDTLS_PSA_KA_MASK_EXTERNAL_ONLY |
MBEDTLS_PSA_KA_MASK_DUAL_USE ) )
return( PSA_ERROR_INVALID_ARGUMENT );
return( PSA_SUCCESS );
}
/** Prepare a key slot to receive key material.
*
* This function allocates a key slot and sets its metadata.
*
* If this function fails, call psa_fail_key_creation().
*
* This function is intended to be used as follows:
* -# Call psa_start_key_creation() to allocate a key slot, prepare
* it with the specified attributes, and in case of a volatile key assign it
* a volatile key identifier.
* -# Populate the slot with the key material.
* -# Call psa_finish_key_creation() to finalize the creation of the slot.
* In case of failure at any step, stop the sequence and call
* psa_fail_key_creation().
*
* On success, the key slot is locked. It is the responsibility of the caller
* to unlock the key slot when it does not access it anymore.
*
* \param method An identification of the calling function.
* \param[in] attributes Key attributes for the new key.
* \param[out] p_slot On success, a pointer to the prepared slot.
* \param[out] p_drv On any return, the driver for the key, if any.
* NULL for a transparent key.
*
* \retval #PSA_SUCCESS
* The key slot is ready to receive key material.
* \return If this function fails, the key slot is an invalid state.
* You must call psa_fail_key_creation() to wipe and free the slot.
*/
static psa_status_t psa_start_key_creation(
psa_key_creation_method_t method,
const psa_key_attributes_t *attributes,
psa_key_slot_t **p_slot,
psa_se_drv_table_entry_t **p_drv )
{
psa_status_t status;
psa_key_id_t volatile_key_id;
psa_key_slot_t *slot;
(void) method;
*p_drv = NULL;
status = psa_validate_key_attributes( attributes, p_drv );
if( status != PSA_SUCCESS )
return( status );
status = psa_get_empty_key_slot( &volatile_key_id, p_slot );
if( status != PSA_SUCCESS )
return( status );
slot = *p_slot;
/* We're storing the declared bit-size of the key. It's up to each
* creation mechanism to verify that this information is correct.
* It's automatically correct for mechanisms that use the bit-size as
* an input (generate, device) but not for those where the bit-size
* is optional (import, copy). In case of a volatile key, assign it the
* volatile key identifier associated to the slot returned to contain its
* definition. */
slot->attr = attributes->core;
if( PSA_KEY_LIFETIME_IS_VOLATILE( slot->attr.lifetime ) )
{
#if !defined(MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER)
slot->attr.id = volatile_key_id;
#else
slot->attr.id.key_id = volatile_key_id;
#endif
}
/* Erase external-only flags from the internal copy. To access
* external-only flags, query `attributes`. Thanks to the check
* in psa_validate_key_attributes(), this leaves the dual-use
* flags and any internal flag that psa_get_empty_key_slot()
* may have set. */
slot->attr.flags &= ~MBEDTLS_PSA_KA_MASK_EXTERNAL_ONLY;
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
/* For a key in a secure element, we need to do three things
* when creating or registering a persistent key:
* create the key file in internal storage, create the
* key inside the secure element, and update the driver's
* persistent data. This is done by starting a transaction that will
* encompass these three actions.
* For registering a volatile key, we just need to find an appropriate
* slot number inside the SE. Since the key is designated volatile, creating
* a transaction is not required. */
/* The first thing to do is to find a slot number for the new key.
* We save the slot number in persistent storage as part of the
* transaction data. It will be needed to recover if the power
* fails during the key creation process, to clean up on the secure
* element side after restarting. Obtaining a slot number from the
* secure element driver updates its persistent state, but we do not yet
* save the driver's persistent state, so that if the power fails,
* we can roll back to a state where the key doesn't exist. */
if( *p_drv != NULL )
{
psa_key_slot_number_t slot_number;
status = psa_find_se_slot_for_key( attributes, method, *p_drv,
&slot_number );
if( status != PSA_SUCCESS )
return( status );
if( ! PSA_KEY_LIFETIME_IS_VOLATILE( attributes->core.lifetime ) )
{
psa_crypto_prepare_transaction( PSA_CRYPTO_TRANSACTION_CREATE_KEY );
psa_crypto_transaction.key.lifetime = slot->attr.lifetime;
psa_crypto_transaction.key.slot = slot_number;
psa_crypto_transaction.key.id = slot->attr.id;
status = psa_crypto_save_transaction( );
if( status != PSA_SUCCESS )
{
(void) psa_crypto_stop_transaction( );
return( status );
}
}
status = psa_copy_key_material_into_slot(
slot, (uint8_t *)( &slot_number ), sizeof( slot_number ) );
}
if( *p_drv == NULL && method == PSA_KEY_CREATION_REGISTER )
{
/* Key registration only makes sense with a secure element. */
return( PSA_ERROR_INVALID_ARGUMENT );
}
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
return( PSA_SUCCESS );
}
/** Finalize the creation of a key once its key material has been set.
*
* This entails writing the key to persistent storage.
*
* If this function fails, call psa_fail_key_creation().
* See the documentation of psa_start_key_creation() for the intended use
* of this function.
*
* If the finalization succeeds, the function unlocks the key slot (it was
* locked by psa_start_key_creation()) and the key slot cannot be accessed
* anymore as part of the key creation process.
*
* \param[in,out] slot Pointer to the slot with key material.
* \param[in] driver The secure element driver for the key,
* or NULL for a transparent key.
* \param[out] key On success, identifier of the key. Note that the
* key identifier is also stored in the key slot.
*
* \retval #PSA_SUCCESS
* The key was successfully created.
* \retval #PSA_ERROR_INSUFFICIENT_MEMORY
* \retval #PSA_ERROR_INSUFFICIENT_STORAGE
* \retval #PSA_ERROR_ALREADY_EXISTS
* \retval #PSA_ERROR_DATA_INVALID
* \retval #PSA_ERROR_DATA_CORRUPT
* \retval #PSA_ERROR_STORAGE_FAILURE
*
* \return If this function fails, the key slot is an invalid state.
* You must call psa_fail_key_creation() to wipe and free the slot.
*/
static psa_status_t psa_finish_key_creation(
psa_key_slot_t *slot,
psa_se_drv_table_entry_t *driver,
mbedtls_svc_key_id_t *key)
{
psa_status_t status = PSA_SUCCESS;
(void) slot;
(void) driver;
#if defined(MBEDTLS_PSA_CRYPTO_STORAGE_C)
if( ! PSA_KEY_LIFETIME_IS_VOLATILE( slot->attr.lifetime ) )
{
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
if( driver != NULL )
{
psa_se_key_data_storage_t data;
psa_key_slot_number_t slot_number =
psa_key_slot_get_slot_number( slot ) ;
#if defined(static_assert)
static_assert( sizeof( slot_number ) ==
sizeof( data.slot_number ),
"Slot number size does not match psa_se_key_data_storage_t" );
#endif
memcpy( &data.slot_number, &slot_number, sizeof( slot_number ) );
status = psa_save_persistent_key( &slot->attr,
(uint8_t*) &data,
sizeof( data ) );
}
else
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
{
/* Key material is saved in export representation in the slot, so
* just pass the slot buffer for storage. */
status = psa_save_persistent_key( &slot->attr,
slot->key.data,
slot->key.bytes );
}
}
#endif /* defined(MBEDTLS_PSA_CRYPTO_STORAGE_C) */
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
/* Finish the transaction for a key creation. This does not
* happen when registering an existing key. Detect this case
* by checking whether a transaction is in progress (actual
* creation of a persistent key in a secure element requires a transaction,
* but registration or volatile key creation doesn't use one). */
if( driver != NULL &&
psa_crypto_transaction.unknown.type == PSA_CRYPTO_TRANSACTION_CREATE_KEY )
{
status = psa_save_se_persistent_data( driver );
if( status != PSA_SUCCESS )
{
psa_destroy_persistent_key( slot->attr.id );
return( status );
}
status = psa_crypto_stop_transaction( );
}
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
if( status == PSA_SUCCESS )
{
*key = slot->attr.id;
status = psa_unlock_key_slot( slot );
if( status != PSA_SUCCESS )
*key = MBEDTLS_SVC_KEY_ID_INIT;
}
return( status );
}
/** Abort the creation of a key.
*
* You may call this function after calling psa_start_key_creation(),
* or after psa_finish_key_creation() fails. In other circumstances, this
* function may not clean up persistent storage.
* See the documentation of psa_start_key_creation() for the intended use
* of this function.
*
* \param[in,out] slot Pointer to the slot with key material.
* \param[in] driver The secure element driver for the key,
* or NULL for a transparent key.
*/
static void psa_fail_key_creation( psa_key_slot_t *slot,
psa_se_drv_table_entry_t *driver )
{
(void) driver;
if( slot == NULL )
return;
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
/* TODO: If the key has already been created in the secure
* element, and the failure happened later (when saving metadata
* to internal storage), we need to destroy the key in the secure
* element.
* https://github.com/ARMmbed/mbed-crypto/issues/217
*/
/* Abort the ongoing transaction if any (there may not be one if
* the creation process failed before starting one, or if the
* key creation is a registration of a key in a secure element).
* Earlier functions must already have done what it takes to undo any
* partial creation. All that's left is to update the transaction data
* itself. */
(void) psa_crypto_stop_transaction( );
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
psa_wipe_key_slot( slot );
}
/** Validate optional attributes during key creation.
*
* Some key attributes are optional during key creation. If they are
* specified in the attributes structure, check that they are consistent
* with the data in the slot.
*
* This function should be called near the end of key creation, after
* the slot in memory is fully populated but before saving persistent data.
*/
static psa_status_t psa_validate_optional_attributes(
const psa_key_slot_t *slot,
const psa_key_attributes_t *attributes )
{
if( attributes->core.type != 0 )
{
if( attributes->core.type != slot->attr.type )
return( PSA_ERROR_INVALID_ARGUMENT );
}
if( attributes->domain_parameters_size != 0 )
{
#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) || \
defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY)
if( PSA_KEY_TYPE_IS_RSA( slot->attr.type ) )
{
mbedtls_rsa_context *rsa = NULL;
mbedtls_mpi actual, required;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
psa_status_t status = mbedtls_psa_rsa_load_representation(
slot->attr.type,
slot->key.data,
slot->key.bytes,
&rsa );
if( status != PSA_SUCCESS )
return( status );
mbedtls_mpi_init( &actual );
mbedtls_mpi_init( &required );
ret = mbedtls_rsa_export( rsa,
NULL, NULL, NULL, NULL, &actual );
mbedtls_rsa_free( rsa );
mbedtls_free( rsa );
if( ret != 0 )
goto rsa_exit;
ret = mbedtls_mpi_read_binary( &required,
attributes->domain_parameters,
attributes->domain_parameters_size );
if( ret != 0 )
goto rsa_exit;
if( mbedtls_mpi_cmp_mpi( &actual, &required ) != 0 )
ret = MBEDTLS_ERR_RSA_BAD_INPUT_DATA;
rsa_exit:
mbedtls_mpi_free( &actual );
mbedtls_mpi_free( &required );
if( ret != 0)
return( mbedtls_to_psa_error( ret ) );
}
else
#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_KEY_PAIR) ||
* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_RSA_PUBLIC_KEY) */
{
return( PSA_ERROR_INVALID_ARGUMENT );
}
}
if( attributes->core.bits != 0 )
{
if( attributes->core.bits != slot->attr.bits )
return( PSA_ERROR_INVALID_ARGUMENT );
}
return( PSA_SUCCESS );
}
psa_status_t psa_import_key( const psa_key_attributes_t *attributes,
const uint8_t *data,
size_t data_length,
mbedtls_svc_key_id_t *key )
{
psa_status_t status;
psa_key_slot_t *slot = NULL;
psa_se_drv_table_entry_t *driver = NULL;
size_t bits;
*key = MBEDTLS_SVC_KEY_ID_INIT;
/* Reject zero-length symmetric keys (including raw data key objects).
* This also rejects any key which might be encoded as an empty string,
* which is never valid. */
if( data_length == 0 )
return( PSA_ERROR_INVALID_ARGUMENT );
status = psa_start_key_creation( PSA_KEY_CREATION_IMPORT, attributes,
&slot, &driver );
if( status != PSA_SUCCESS )
goto exit;
/* In the case of a transparent key or an opaque key stored in local
* storage (thus not in the case of generating a key in a secure element
* or cryptoprocessor with storage), we have to allocate a buffer to
* hold the generated key material. */
if( slot->key.data == NULL )
{
status = psa_allocate_buffer_to_slot( slot, data_length );
if( status != PSA_SUCCESS )
goto exit;
}
bits = slot->attr.bits;
status = psa_driver_wrapper_import_key( attributes,
data, data_length,
slot->key.data,
slot->key.bytes,
&slot->key.bytes, &bits );
if( status != PSA_SUCCESS )
goto exit;
if( slot->attr.bits == 0 )
slot->attr.bits = (psa_key_bits_t) bits;
else if( bits != slot->attr.bits )
{
status = PSA_ERROR_INVALID_ARGUMENT;
goto exit;
}
status = psa_validate_optional_attributes( slot, attributes );
if( status != PSA_SUCCESS )
goto exit;
status = psa_finish_key_creation( slot, driver, key );
exit:
if( status != PSA_SUCCESS )
psa_fail_key_creation( slot, driver );
return( status );
}
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
psa_status_t mbedtls_psa_register_se_key(
const psa_key_attributes_t *attributes )
{
psa_status_t status;
psa_key_slot_t *slot = NULL;
psa_se_drv_table_entry_t *driver = NULL;
mbedtls_svc_key_id_t key = MBEDTLS_SVC_KEY_ID_INIT;
/* Leaving attributes unspecified is not currently supported.
* It could make sense to query the key type and size from the
* secure element, but not all secure elements support this
* and the driver HAL doesn't currently support it. */
if( psa_get_key_type( attributes ) == PSA_KEY_TYPE_NONE )
return( PSA_ERROR_NOT_SUPPORTED );
if( psa_get_key_bits( attributes ) == 0 )
return( PSA_ERROR_NOT_SUPPORTED );
status = psa_start_key_creation( PSA_KEY_CREATION_REGISTER, attributes,
&slot, &driver );
if( status != PSA_SUCCESS )
goto exit;
status = psa_finish_key_creation( slot, driver, &key );
exit:
if( status != PSA_SUCCESS )
psa_fail_key_creation( slot, driver );
/* Registration doesn't keep the key in RAM. */
psa_close_key( key );
return( status );
}
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
static psa_status_t psa_copy_key_material( const psa_key_slot_t *source,
psa_key_slot_t *target )
{
psa_status_t status = psa_copy_key_material_into_slot( target,
source->key.data,
source->key.bytes );
if( status != PSA_SUCCESS )
return( status );
target->attr.type = source->attr.type;
target->attr.bits = source->attr.bits;
return( PSA_SUCCESS );
}
psa_status_t psa_copy_key( mbedtls_svc_key_id_t source_key,
const psa_key_attributes_t *specified_attributes,
mbedtls_svc_key_id_t *target_key )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_slot_t *source_slot = NULL;
psa_key_slot_t *target_slot = NULL;
psa_key_attributes_t actual_attributes = *specified_attributes;
psa_se_drv_table_entry_t *driver = NULL;
*target_key = MBEDTLS_SVC_KEY_ID_INIT;
status = psa_get_and_lock_transparent_key_slot_with_policy(
source_key, &source_slot, PSA_KEY_USAGE_COPY, 0 );
if( status != PSA_SUCCESS )
goto exit;
status = psa_validate_optional_attributes( source_slot,
specified_attributes );
if( status != PSA_SUCCESS )
goto exit;
status = psa_restrict_key_policy( source_slot->attr.type,
&actual_attributes.core.policy,
&source_slot->attr.policy );
if( status != PSA_SUCCESS )
goto exit;
status = psa_start_key_creation( PSA_KEY_CREATION_COPY, &actual_attributes,
&target_slot, &driver );
if( status != PSA_SUCCESS )
goto exit;
#if defined(MBEDTLS_PSA_CRYPTO_SE_C)
if( driver != NULL )
{
/* Copying to a secure element is not implemented yet. */
status = PSA_ERROR_NOT_SUPPORTED;
goto exit;
}
#endif /* MBEDTLS_PSA_CRYPTO_SE_C */
if( psa_key_lifetime_is_external( actual_attributes.core.lifetime ) )
{
/*
* Copying through an opaque driver is not implemented yet, consider
* a lifetime with an external location as an invalid parameter for
* now.
*/
status = PSA_ERROR_INVALID_ARGUMENT;
goto exit;
}
status = psa_copy_key_material( source_slot, target_slot );
if( status != PSA_SUCCESS )
goto exit;
status = psa_finish_key_creation( target_slot, driver, target_key );
exit:
if( status != PSA_SUCCESS )
psa_fail_key_creation( target_slot, driver );
unlock_status = psa_unlock_key_slot( source_slot );
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
}
/****************************************************************/
/* Message digests */
/****************************************************************/
psa_status_t psa_hash_abort( psa_hash_operation_t *operation )
{
/* Aborting a non-active operation is allowed */
if( operation->id == 0 )
return( PSA_SUCCESS );
psa_status_t status = psa_driver_wrapper_hash_abort( operation );
operation->id = 0;
return( status );
}
psa_status_t psa_hash_setup( psa_hash_operation_t *operation,
psa_algorithm_t alg )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
/* A context must be freshly initialized before it can be set up. */
if( operation->id != 0 )
{
status = PSA_ERROR_BAD_STATE;
goto exit;
}
if( !PSA_ALG_IS_HASH( alg ) )
{
status = PSA_ERROR_INVALID_ARGUMENT;
goto exit;
}
/* Ensure all of the context is zeroized, since PSA_HASH_OPERATION_INIT only
* directly zeroes the int-sized dummy member of the context union. */
memset( &operation->ctx, 0, sizeof( operation->ctx ) );
status = psa_driver_wrapper_hash_setup( operation, alg );
exit:
if( status != PSA_SUCCESS )
psa_hash_abort( operation );
return status;
}
psa_status_t psa_hash_update( psa_hash_operation_t *operation,
const uint8_t *input,
size_t input_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
if( operation->id == 0 )
{
status = PSA_ERROR_BAD_STATE;
goto exit;
}
/* Don't require hash implementations to behave correctly on a
* zero-length input, which may have an invalid pointer. */
if( input_length == 0 )
return( PSA_SUCCESS );
status = psa_driver_wrapper_hash_update( operation, input, input_length );
exit:
if( status != PSA_SUCCESS )
psa_hash_abort( operation );
return( status );
}
psa_status_t psa_hash_finish( psa_hash_operation_t *operation,
uint8_t *hash,
size_t hash_size,
size_t *hash_length )
{
*hash_length = 0;
if( operation->id == 0 )
return( PSA_ERROR_BAD_STATE );
psa_status_t status = psa_driver_wrapper_hash_finish(
operation, hash, hash_size, hash_length );
psa_hash_abort( operation );
return( status );
}
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 )
goto exit;
if( actual_hash_length != hash_length )
{
status = PSA_ERROR_INVALID_SIGNATURE;
goto exit;
}
if( mbedtls_psa_safer_memcmp( hash, actual_hash, actual_hash_length ) != 0 )
status = PSA_ERROR_INVALID_SIGNATURE;
exit:
if( status != PSA_SUCCESS )
psa_hash_abort(operation);
return( status );
}
psa_status_t psa_hash_compute( psa_algorithm_t alg,
const uint8_t *input, size_t input_length,
uint8_t *hash, size_t hash_size,
size_t *hash_length )
{
*hash_length = 0;
if( !PSA_ALG_IS_HASH( alg ) )
return( PSA_ERROR_INVALID_ARGUMENT );
return( psa_driver_wrapper_hash_compute( alg, input, input_length,
hash, hash_size, hash_length ) );
}
psa_status_t psa_hash_compare( psa_algorithm_t alg,
const uint8_t *input, size_t input_length,
const uint8_t *hash, size_t hash_length )
{
uint8_t actual_hash[MBEDTLS_MD_MAX_SIZE];
size_t actual_hash_length;
if( !PSA_ALG_IS_HASH( alg ) )
return( PSA_ERROR_INVALID_ARGUMENT );
psa_status_t status = psa_driver_wrapper_hash_compute(
alg, input, input_length,
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( mbedtls_psa_safer_memcmp( hash, actual_hash, actual_hash_length ) != 0 )
return( PSA_ERROR_INVALID_SIGNATURE );
return( PSA_SUCCESS );
}
psa_status_t psa_hash_clone( const psa_hash_operation_t *source_operation,
psa_hash_operation_t *target_operation )
{
if( source_operation->id == 0 ||
target_operation->id != 0 )
{
return( PSA_ERROR_BAD_STATE );
}
psa_status_t status = psa_driver_wrapper_hash_clone( source_operation,
target_operation );
if( status != PSA_SUCCESS )
psa_hash_abort( target_operation );
return( status );
}
/****************************************************************/
/* MAC */
/****************************************************************/
psa_status_t psa_mac_abort( psa_mac_operation_t *operation )
{
/* Aborting a non-active operation is allowed */
if( operation->id == 0 )
return( PSA_SUCCESS );
psa_status_t status = psa_driver_wrapper_mac_abort( operation );
operation->mac_size = 0;
operation->is_sign = 0;
operation->id = 0;
return( status );
}
static psa_status_t psa_mac_finalize_alg_and_key_validation(
psa_algorithm_t alg,
const psa_key_attributes_t *attributes,
uint8_t *mac_size )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_type_t key_type = psa_get_key_type( attributes );
size_t key_bits = psa_get_key_bits( attributes );
if( ! PSA_ALG_IS_MAC( alg ) )
return( PSA_ERROR_INVALID_ARGUMENT );
/* Validate the combination of key type and algorithm */
status = psa_mac_key_can_do( alg, key_type );
if( status != PSA_SUCCESS )
return( status );
/* Get the output length for the algorithm and key combination */
*mac_size = PSA_MAC_LENGTH( key_type, key_bits, alg );
if( *mac_size < 4 )
{
/* A very short MAC is too short for security since it can be
* brute-forced. Ancient protocols with 32-bit MACs do exist,
* so we make this our minimum, even though 32 bits is still
* too small for security. */
return( PSA_ERROR_NOT_SUPPORTED );
}
if( *mac_size > PSA_MAC_LENGTH( key_type, key_bits,
PSA_ALG_FULL_LENGTH_MAC( alg ) ) )
{
/* It's impossible to "truncate" to a larger length than the full length
* of the algorithm. */
return( PSA_ERROR_INVALID_ARGUMENT );
}
return( PSA_SUCCESS );
}
static psa_status_t psa_mac_setup( psa_mac_operation_t *operation,
mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
int is_sign )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_slot_t *slot = NULL;
/* A context must be freshly initialized before it can be set up. */
if( operation->id != 0 )
{
status = PSA_ERROR_BAD_STATE;
goto exit;
}
status = psa_get_and_lock_key_slot_with_policy(
key,
&slot,
is_sign ? PSA_KEY_USAGE_SIGN_HASH : PSA_KEY_USAGE_VERIFY_HASH,
alg );
if( status != PSA_SUCCESS )
goto exit;
psa_key_attributes_t attributes = {
.core = slot->attr
};
status = psa_mac_finalize_alg_and_key_validation( alg, &attributes,
&operation->mac_size );
if( status != PSA_SUCCESS )
goto exit;
operation->is_sign = is_sign;
/* Dispatch the MAC setup call with validated input */
if( is_sign )
{
status = psa_driver_wrapper_mac_sign_setup( operation,
&attributes,
slot->key.data,
slot->key.bytes,
alg );
}
else
{
status = psa_driver_wrapper_mac_verify_setup( operation,
&attributes,
slot->key.data,
slot->key.bytes,
alg );
}
exit:
if( status != PSA_SUCCESS )
psa_mac_abort( operation );
unlock_status = psa_unlock_key_slot( slot );
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
}
psa_status_t psa_mac_sign_setup( psa_mac_operation_t *operation,
mbedtls_svc_key_id_t key,
psa_algorithm_t alg )
{
return( psa_mac_setup( operation, key, alg, 1 ) );
}
psa_status_t psa_mac_verify_setup( psa_mac_operation_t *operation,
mbedtls_svc_key_id_t key,
psa_algorithm_t alg )
{
return( psa_mac_setup( operation, key, alg, 0 ) );
}
psa_status_t psa_mac_update( psa_mac_operation_t *operation,
const uint8_t *input,
size_t input_length )
{
if( operation->id == 0 )
return( PSA_ERROR_BAD_STATE );
/* Don't require hash implementations to behave correctly on a
* zero-length input, which may have an invalid pointer. */
if( input_length == 0 )
return( PSA_SUCCESS );
psa_status_t status = psa_driver_wrapper_mac_update( operation,
input, input_length );
if( status != PSA_SUCCESS )
psa_mac_abort( operation );
return( status );
}
psa_status_t psa_mac_sign_finish( psa_mac_operation_t *operation,
uint8_t *mac,
size_t mac_size,
size_t *mac_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_status_t abort_status = PSA_ERROR_CORRUPTION_DETECTED;
if( operation->id == 0 )
{
status = PSA_ERROR_BAD_STATE;
goto exit;
}
if( ! operation->is_sign )
{
status = PSA_ERROR_BAD_STATE;
goto exit;
}
/* Sanity check. This will guarantee that mac_size != 0 (and so mac != NULL)
* once all the error checks are done. */
if( operation->mac_size == 0 )
{
status = PSA_ERROR_BAD_STATE;
goto exit;
}
if( mac_size < operation->mac_size )
{
status = PSA_ERROR_BUFFER_TOO_SMALL;
goto exit;
}
status = psa_driver_wrapper_mac_sign_finish( operation,
mac, operation->mac_size,
mac_length );
exit:
/* In case of success, set the potential excess room in the output buffer
* to an invalid value, to avoid potentially leaking a longer MAC.
* In case of error, set the output length and content to a safe default,
* such that in case the caller misses an error check, the output would be
* an unachievable MAC.
*/
if( status != PSA_SUCCESS )
{
*mac_length = mac_size;
operation->mac_size = 0;
}
if( mac_size > operation->mac_size )
memset( &mac[operation->mac_size], '!',
mac_size - operation->mac_size );
abort_status = psa_mac_abort( operation );
return( status == PSA_SUCCESS ? abort_status : status );
}
psa_status_t psa_mac_verify_finish( psa_mac_operation_t *operation,
const uint8_t *mac,
size_t mac_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_status_t abort_status = PSA_ERROR_CORRUPTION_DETECTED;
if( operation->id == 0 )
{
status = PSA_ERROR_BAD_STATE;
goto exit;
}
if( operation->is_sign )
{
status = PSA_ERROR_BAD_STATE;
goto exit;
}
if( operation->mac_size != mac_length )
{
status = PSA_ERROR_INVALID_SIGNATURE;
goto exit;
}
status = psa_driver_wrapper_mac_verify_finish( operation,
mac, mac_length );
exit:
abort_status = psa_mac_abort( operation );
return( status == PSA_SUCCESS ? abort_status : status );
}
static psa_status_t psa_mac_compute_internal( mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *mac,
size_t mac_size,
size_t *mac_length,
int is_sign )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_slot_t *slot;
uint8_t operation_mac_size = 0;
status = psa_get_and_lock_key_slot_with_policy(
key, &slot,
is_sign ? PSA_KEY_USAGE_SIGN_HASH : PSA_KEY_USAGE_VERIFY_HASH,
alg );
if( status != PSA_SUCCESS )
goto exit;
psa_key_attributes_t attributes = {
.core = slot->attr
};
status = psa_mac_finalize_alg_and_key_validation( alg, &attributes,
&operation_mac_size );
if( status != PSA_SUCCESS )
goto exit;
if( mac_size < operation_mac_size )
{
status = PSA_ERROR_BUFFER_TOO_SMALL;
goto exit;
}
status = psa_driver_wrapper_mac_compute(
&attributes,
slot->key.data, slot->key.bytes,
alg,
input, input_length,
mac, operation_mac_size, mac_length );
exit:
/* In case of success, set the potential excess room in the output buffer
* to an invalid value, to avoid potentially leaking a longer MAC.
* In case of error, set the output length and content to a safe default,
* such that in case the caller misses an error check, the output would be
* an unachievable MAC.
*/
if( status != PSA_SUCCESS )
{
*mac_length = mac_size;
operation_mac_size = 0;
}
if( mac_size > operation_mac_size )
memset( &mac[operation_mac_size], '!', mac_size - operation_mac_size );
unlock_status = psa_unlock_key_slot( slot );
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
}
psa_status_t psa_mac_compute( mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *mac,
size_t mac_size,
size_t *mac_length)
{
return( psa_mac_compute_internal( key, alg,
input, input_length,
mac, mac_size, mac_length, 1 ) );
}
psa_status_t psa_mac_verify( mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
const uint8_t *mac,
size_t mac_length)
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
uint8_t actual_mac[PSA_MAC_MAX_SIZE];
size_t actual_mac_length;
status = psa_mac_compute_internal( key, alg,
input, input_length,
actual_mac, sizeof( actual_mac ),
&actual_mac_length, 0 );
if( status != PSA_SUCCESS )
goto exit;
if( mac_length != actual_mac_length )
{
status = PSA_ERROR_INVALID_SIGNATURE;
goto exit;
}
if( mbedtls_psa_safer_memcmp( mac, actual_mac, actual_mac_length ) != 0 )
{
status = PSA_ERROR_INVALID_SIGNATURE;
goto exit;
}
exit:
mbedtls_platform_zeroize( actual_mac, sizeof( actual_mac ) );
return ( status );
}
/****************************************************************/
/* Asymmetric cryptography */
/****************************************************************/
static psa_status_t psa_sign_verify_check_alg( int input_is_message,
psa_algorithm_t alg )
{
if( input_is_message )
{
if( ! PSA_ALG_IS_SIGN_MESSAGE( alg ) )
return( PSA_ERROR_INVALID_ARGUMENT );
if ( PSA_ALG_IS_HASH_AND_SIGN( alg ) )
{
if( ! PSA_ALG_IS_HASH( PSA_ALG_SIGN_GET_HASH( alg ) ) )
return( PSA_ERROR_INVALID_ARGUMENT );
}
}
else
{
if( ! PSA_ALG_IS_HASH_AND_SIGN( alg ) )
return( PSA_ERROR_INVALID_ARGUMENT );
}
return( PSA_SUCCESS );
}
static psa_status_t psa_sign_internal( mbedtls_svc_key_id_t key,
int input_is_message,
psa_algorithm_t alg,
const uint8_t * input,
size_t input_length,
uint8_t * signature,
size_t signature_size,
size_t * signature_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_slot_t *slot;
*signature_length = 0;
status = psa_sign_verify_check_alg( input_is_message, alg );
if( status != PSA_SUCCESS )
return status;
/* Immediately reject a zero-length signature buffer. This guarantees
* that signature must be a valid pointer. (On the other hand, the input
* buffer can in principle be empty since it doesn't actually have
* to be a hash.) */
if( signature_size == 0 )
return( PSA_ERROR_BUFFER_TOO_SMALL );
status = psa_get_and_lock_key_slot_with_policy(
key, &slot,
input_is_message ? PSA_KEY_USAGE_SIGN_MESSAGE :
PSA_KEY_USAGE_SIGN_HASH,
alg );
if( status != PSA_SUCCESS )
goto exit;
if( ! PSA_KEY_TYPE_IS_KEY_PAIR( slot->attr.type ) )
{
status = PSA_ERROR_INVALID_ARGUMENT;
goto exit;
}
psa_key_attributes_t attributes = {
.core = slot->attr
};
if( input_is_message )
{
status = psa_driver_wrapper_sign_message(
&attributes, slot->key.data, slot->key.bytes,
alg, input, input_length,
signature, signature_size, signature_length );
}
else
{
status = psa_driver_wrapper_sign_hash(
&attributes, slot->key.data, slot->key.bytes,
alg, input, input_length,
signature, signature_size, signature_length );
}
exit:
/* Fill the unused part of the output buffer (the whole buffer on error,
* the trailing part on success) with something that isn't a valid signature
* (barring an attack on the signature and deliberately-crafted input),
* in case the caller doesn't check the return status properly. */
if( status == PSA_SUCCESS )
memset( signature + *signature_length, '!',
signature_size - *signature_length );
else
memset( signature, '!', signature_size );
/* If signature_size is 0 then we have nothing to do. We must not call
* memset because signature may be NULL in this case. */
unlock_status = psa_unlock_key_slot( slot );
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
}
static psa_status_t psa_verify_internal( mbedtls_svc_key_id_t key,
int input_is_message,
psa_algorithm_t alg,
const uint8_t * input,
size_t input_length,
const uint8_t * signature,
size_t signature_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
psa_status_t unlock_status = PSA_ERROR_CORRUPTION_DETECTED;
psa_key_slot_t *slot;
status = psa_sign_verify_check_alg( input_is_message, alg );
if( status != PSA_SUCCESS )
return status;
status = psa_get_and_lock_key_slot_with_policy(
key, &slot,
input_is_message ? PSA_KEY_USAGE_VERIFY_MESSAGE :
PSA_KEY_USAGE_VERIFY_HASH,
alg );
if( status != PSA_SUCCESS )
return( status );
psa_key_attributes_t attributes = {
.core = slot->attr
};
if( input_is_message )
{
status = psa_driver_wrapper_verify_message(
&attributes, slot->key.data, slot->key.bytes,
alg, input, input_length,
signature, signature_length );
}
else
{
status = psa_driver_wrapper_verify_hash(
&attributes, slot->key.data, slot->key.bytes,
alg, input, input_length,
signature, signature_length );
}
unlock_status = psa_unlock_key_slot( slot );
return( ( status == PSA_SUCCESS ) ? unlock_status : status );
}
psa_status_t psa_sign_message_builtin(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer,
size_t key_buffer_size,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
uint8_t *signature,
size_t signature_size,
size_t *signature_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
if ( PSA_ALG_IS_HASH_AND_SIGN( alg ) )
{
size_t hash_length;
uint8_t hash[PSA_HASH_MAX_SIZE];
status = psa_driver_wrapper_hash_compute(
PSA_ALG_SIGN_GET_HASH( alg ),
input, input_length,
hash, sizeof( hash ), &hash_length );
if( status != PSA_SUCCESS )
return status;
return psa_driver_wrapper_sign_hash(
attributes, key_buffer, key_buffer_size,
alg, hash, hash_length,
signature, signature_size, signature_length );
}
return( PSA_ERROR_NOT_SUPPORTED );
}
psa_status_t psa_sign_message( mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t * input,
size_t input_length,
uint8_t * signature,
size_t signature_size,
size_t * signature_length )
{
return psa_sign_internal(
key, 1, alg, input, input_length,
signature, signature_size, signature_length );
}
psa_status_t psa_verify_message_builtin(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer,
size_t key_buffer_size,
psa_algorithm_t alg,
const uint8_t *input,
size_t input_length,
const uint8_t *signature,
size_t signature_length )
{
psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
if ( PSA_ALG_IS_HASH_AND_SIGN( alg ) )
{
size_t hash_length;
uint8_t hash[PSA_HASH_MAX_SIZE];
status = psa_driver_wrapper_hash_compute(
PSA_ALG_SIGN_GET_HASH( alg ),
input, input_length,
hash, sizeof( hash ), &hash_length );
if( status != PSA_SUCCESS )
return status;
return psa_driver_wrapper_verify_hash(
attributes, key_buffer, key_buffer_size,
alg, hash, hash_length,
signature, signature_length );
}
return( PSA_ERROR_NOT_SUPPORTED );
}
psa_status_t psa_verify_message( mbedtls_svc_key_id_t key,
psa_algorithm_t alg,
const uint8_t * input,
size_t input_length,
const uint8_t * signature,
size_t signature_length )
{
return psa_verify_internal(
key, 1, alg, input, input_length,
signature, signature_length );
}
psa_status_t psa_sign_hash_builtin(
const psa_key_attributes_t *attributes,
const uint8_t *key_buffer, size_t key_buffer_size,
psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
uint8_t *signature, size_t signature_size, size_t *signature_length )
{
if( attributes->core.type == PSA_KEY_TYPE_RSA_KEY_PAIR )
{
if( PSA_ALG_IS_RSA_PKCS1V15_SIGN( alg ) ||
PSA_ALG_IS_RSA_PSS( alg) )
{
#if defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) || \
defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS)
return( mbedtls_psa_rsa_sign_hash(
attributes,
key_buffer, key_buffer_size,
alg, hash, hash_length,
signature, signature_size, signature_length ) );
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PKCS1V15_SIGN) ||
* defined(MBEDTLS_PSA_BUILTIN_ALG_RSA_PSS) */
}
else
{
return( PSA_ERROR_INVALID_ARGUMENT );
}
}
else
if( PSA_KEY_TYPE_IS_ECC( attributes->core.type ) )
{
if( PSA_ALG_IS_ECDSA( alg ) )
{
#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) || \
defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
return( mbedtls_psa_ecdsa_sign_hash(
attributes,
key_buffer, key_buffer_size,
alg, hash, hash_length,
signature, signature_size, signature_length ) );
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) ||
* defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) */
}
else
{
return( PSA_ERROR_INVALID_ARG