540 lines
19 KiB
C
540 lines
19 KiB
C
/*
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* PSA ECP layer on top of Mbed TLS crypto
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*/
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/*
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* Copyright The Mbed TLS Contributors
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* SPDX-License-Identifier: Apache-2.0
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*
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* Licensed under the Apache License, Version 2.0 (the "License"); you may
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* not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "common.h"
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#if defined(MBEDTLS_PSA_CRYPTO_C)
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#include <psa/crypto.h>
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#include "psa_crypto_core.h"
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#include "psa_crypto_ecp.h"
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#include "psa_crypto_random_impl.h"
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#include "hash_info.h"
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#include <stdlib.h>
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#include <string.h>
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#include "mbedtls/platform.h"
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#include <mbedtls/ecdsa.h>
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#include <mbedtls/ecdh.h>
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#include <mbedtls/ecp.h>
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#include <mbedtls/error.h>
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#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) || \
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defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY) || \
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defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) || \
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defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) || \
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defined(MBEDTLS_PSA_BUILTIN_ALG_ECDH)
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psa_status_t mbedtls_psa_ecp_load_representation(
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psa_key_type_t type, size_t curve_bits,
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const uint8_t *data, size_t data_length,
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mbedtls_ecp_keypair **p_ecp )
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{
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mbedtls_ecp_group_id grp_id = MBEDTLS_ECP_DP_NONE;
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psa_status_t status;
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mbedtls_ecp_keypair *ecp = NULL;
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size_t curve_bytes = data_length;
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int explicit_bits = ( curve_bits != 0 );
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if( PSA_KEY_TYPE_IS_PUBLIC_KEY( type ) &&
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PSA_KEY_TYPE_ECC_GET_FAMILY( type ) != PSA_ECC_FAMILY_MONTGOMERY )
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{
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/* A Weierstrass public key is represented as:
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* - The byte 0x04;
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* - `x_P` as a `ceiling(m/8)`-byte string, big-endian;
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* - `y_P` as a `ceiling(m/8)`-byte string, big-endian.
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* So its data length is 2m+1 where m is the curve size in bits.
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*/
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if( ( data_length & 1 ) == 0 )
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return( PSA_ERROR_INVALID_ARGUMENT );
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curve_bytes = data_length / 2;
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/* Montgomery public keys are represented in compressed format, meaning
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* their curve_bytes is equal to the amount of input. */
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/* Private keys are represented in uncompressed private random integer
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* format, meaning their curve_bytes is equal to the amount of input. */
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}
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if( explicit_bits )
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{
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/* With an explicit bit-size, the data must have the matching length. */
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if( curve_bytes != PSA_BITS_TO_BYTES( curve_bits ) )
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return( PSA_ERROR_INVALID_ARGUMENT );
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}
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else
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{
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/* We need to infer the bit-size from the data. Since the only
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* information we have is the length in bytes, the value of curve_bits
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* at this stage is rounded up to the nearest multiple of 8. */
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curve_bits = PSA_BYTES_TO_BITS( curve_bytes );
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}
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/* Allocate and initialize a key representation. */
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ecp = mbedtls_calloc( 1, sizeof( mbedtls_ecp_keypair ) );
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if( ecp == NULL )
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return( PSA_ERROR_INSUFFICIENT_MEMORY );
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mbedtls_ecp_keypair_init( ecp );
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/* Load the group. */
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grp_id = mbedtls_ecc_group_of_psa( PSA_KEY_TYPE_ECC_GET_FAMILY( type ),
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curve_bits, !explicit_bits );
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if( grp_id == MBEDTLS_ECP_DP_NONE )
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{
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/* We can't distinguish between a nonsensical family/size combination
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* (which would warrant PSA_ERROR_INVALID_ARGUMENT) and a
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* well-regarded curve that Mbed TLS just doesn't know about (which
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* would warrant PSA_ERROR_NOT_SUPPORTED). For uniformity with how
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* curves that Mbed TLS knows about but for which support is disabled
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* at build time, return NOT_SUPPORTED. */
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status = PSA_ERROR_NOT_SUPPORTED;
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goto exit;
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}
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status = mbedtls_to_psa_error(
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mbedtls_ecp_group_load( &ecp->grp, grp_id ) );
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if( status != PSA_SUCCESS )
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goto exit;
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/* Load the key material. */
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if( PSA_KEY_TYPE_IS_PUBLIC_KEY( type ) )
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{
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/* Load the public value. */
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status = mbedtls_to_psa_error(
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mbedtls_ecp_point_read_binary( &ecp->grp, &ecp->Q,
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data,
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data_length ) );
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if( status != PSA_SUCCESS )
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goto exit;
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/* Check that the point is on the curve. */
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status = mbedtls_to_psa_error(
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mbedtls_ecp_check_pubkey( &ecp->grp, &ecp->Q ) );
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if( status != PSA_SUCCESS )
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goto exit;
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}
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else
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{
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/* Load and validate the secret value. */
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status = mbedtls_to_psa_error(
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mbedtls_ecp_read_key( ecp->grp.id,
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ecp,
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data,
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data_length ) );
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if( status != PSA_SUCCESS )
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goto exit;
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}
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*p_ecp = ecp;
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exit:
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if( status != PSA_SUCCESS )
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{
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mbedtls_ecp_keypair_free( ecp );
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mbedtls_free( ecp );
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}
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return( status );
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}
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#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) ||
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* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY) ||
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* defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) ||
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* defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) ||
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* defined(MBEDTLS_PSA_BUILTIN_ALG_ECDH) */
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#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) || \
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defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY)
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psa_status_t mbedtls_psa_ecp_import_key(
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const psa_key_attributes_t *attributes,
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const uint8_t *data, size_t data_length,
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uint8_t *key_buffer, size_t key_buffer_size,
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size_t *key_buffer_length, size_t *bits )
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{
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psa_status_t status;
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mbedtls_ecp_keypair *ecp = NULL;
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/* Parse input */
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status = mbedtls_psa_ecp_load_representation( attributes->core.type,
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attributes->core.bits,
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data,
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data_length,
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&ecp );
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if( status != PSA_SUCCESS )
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goto exit;
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if( PSA_KEY_TYPE_ECC_GET_FAMILY( attributes->core.type ) ==
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PSA_ECC_FAMILY_MONTGOMERY )
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*bits = ecp->grp.nbits + 1;
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else
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*bits = ecp->grp.nbits;
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/* Re-export the data to PSA export format. There is currently no support
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* for other input formats then the export format, so this is a 1-1
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* copy operation. */
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status = mbedtls_psa_ecp_export_key( attributes->core.type,
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ecp,
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key_buffer,
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key_buffer_size,
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key_buffer_length );
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exit:
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/* Always free the PK object (will also free contained ECP context) */
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mbedtls_ecp_keypair_free( ecp );
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mbedtls_free( ecp );
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return( status );
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}
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psa_status_t mbedtls_psa_ecp_export_key( psa_key_type_t type,
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mbedtls_ecp_keypair *ecp,
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uint8_t *data,
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size_t data_size,
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size_t *data_length )
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{
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psa_status_t status;
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if( PSA_KEY_TYPE_IS_PUBLIC_KEY( type ) )
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{
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/* Check whether the public part is loaded */
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if( mbedtls_ecp_is_zero( &ecp->Q ) )
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{
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/* Calculate the public key */
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status = mbedtls_to_psa_error(
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mbedtls_ecp_mul( &ecp->grp, &ecp->Q, &ecp->d, &ecp->grp.G,
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mbedtls_psa_get_random,
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MBEDTLS_PSA_RANDOM_STATE ) );
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if( status != PSA_SUCCESS )
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return( status );
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}
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status = mbedtls_to_psa_error(
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mbedtls_ecp_point_write_binary( &ecp->grp, &ecp->Q,
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MBEDTLS_ECP_PF_UNCOMPRESSED,
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data_length,
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data,
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data_size ) );
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if( status != PSA_SUCCESS )
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memset( data, 0, data_size );
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return( status );
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}
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else
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{
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if( data_size < PSA_BITS_TO_BYTES( ecp->grp.nbits ) )
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return( PSA_ERROR_BUFFER_TOO_SMALL );
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status = mbedtls_to_psa_error(
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mbedtls_ecp_write_key( ecp,
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data,
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PSA_BITS_TO_BYTES( ecp->grp.nbits ) ) );
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if( status == PSA_SUCCESS )
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*data_length = PSA_BITS_TO_BYTES( ecp->grp.nbits );
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else
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memset( data, 0, data_size );
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return( status );
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}
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}
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psa_status_t mbedtls_psa_ecp_export_public_key(
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const psa_key_attributes_t *attributes,
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const uint8_t *key_buffer, size_t key_buffer_size,
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uint8_t *data, size_t data_size, size_t *data_length )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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mbedtls_ecp_keypair *ecp = NULL;
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status = mbedtls_psa_ecp_load_representation(
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attributes->core.type, attributes->core.bits,
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key_buffer, key_buffer_size, &ecp );
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if( status != PSA_SUCCESS )
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return( status );
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status = mbedtls_psa_ecp_export_key(
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PSA_KEY_TYPE_ECC_PUBLIC_KEY(
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PSA_KEY_TYPE_ECC_GET_FAMILY( attributes->core.type ) ),
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ecp, data, data_size, data_length );
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mbedtls_ecp_keypair_free( ecp );
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mbedtls_free( ecp );
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return( status );
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}
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#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) ||
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* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_PUBLIC_KEY) */
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#if defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR)
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psa_status_t mbedtls_psa_ecp_generate_key(
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const psa_key_attributes_t *attributes,
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uint8_t *key_buffer, size_t key_buffer_size, size_t *key_buffer_length )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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psa_ecc_family_t curve = PSA_KEY_TYPE_ECC_GET_FAMILY(
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attributes->core.type );
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mbedtls_ecp_group_id grp_id =
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mbedtls_ecc_group_of_psa( curve, attributes->core.bits, 0 );
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const mbedtls_ecp_curve_info *curve_info =
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mbedtls_ecp_curve_info_from_grp_id( grp_id );
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mbedtls_ecp_keypair ecp;
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if( attributes->domain_parameters_size != 0 )
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return( PSA_ERROR_NOT_SUPPORTED );
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if( grp_id == MBEDTLS_ECP_DP_NONE || curve_info == NULL )
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return( PSA_ERROR_NOT_SUPPORTED );
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mbedtls_ecp_keypair_init( &ecp );
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ret = mbedtls_ecp_gen_key( grp_id, &ecp,
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mbedtls_psa_get_random,
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MBEDTLS_PSA_RANDOM_STATE );
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if( ret != 0 )
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{
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mbedtls_ecp_keypair_free( &ecp );
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return( mbedtls_to_psa_error( ret ) );
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}
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status = mbedtls_to_psa_error(
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mbedtls_ecp_write_key( &ecp, key_buffer, key_buffer_size ) );
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mbedtls_ecp_keypair_free( &ecp );
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if( status == PSA_SUCCESS )
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*key_buffer_length = key_buffer_size;
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return( status );
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}
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#endif /* defined(MBEDTLS_PSA_BUILTIN_KEY_TYPE_ECC_KEY_PAIR) */
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/****************************************************************/
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/* ECDSA sign/verify */
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/****************************************************************/
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) || \
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defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
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psa_status_t mbedtls_psa_ecdsa_sign_hash(
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const psa_key_attributes_t *attributes,
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const uint8_t *key_buffer, size_t key_buffer_size,
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psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
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uint8_t *signature, size_t signature_size, size_t *signature_length )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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mbedtls_ecp_keypair *ecp = NULL;
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t curve_bytes;
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mbedtls_mpi r, s;
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status = mbedtls_psa_ecp_load_representation( attributes->core.type,
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attributes->core.bits,
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key_buffer,
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key_buffer_size,
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&ecp );
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if( status != PSA_SUCCESS )
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return( status );
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curve_bytes = PSA_BITS_TO_BYTES( ecp->grp.pbits );
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mbedtls_mpi_init( &r );
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mbedtls_mpi_init( &s );
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if( signature_size < 2 * curve_bytes )
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{
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ret = MBEDTLS_ERR_ECP_BUFFER_TOO_SMALL;
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goto cleanup;
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}
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if( PSA_ALG_ECDSA_IS_DETERMINISTIC( alg ) )
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{
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#if defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA)
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psa_algorithm_t hash_alg = PSA_ALG_SIGN_GET_HASH( alg );
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mbedtls_md_type_t md_alg = mbedtls_hash_info_md_from_psa( hash_alg );
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MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign_det_ext(
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&ecp->grp, &r, &s,
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&ecp->d, hash,
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hash_length, md_alg,
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mbedtls_psa_get_random,
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MBEDTLS_PSA_RANDOM_STATE ) );
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#else
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ret = MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE;
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goto cleanup;
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#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) */
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}
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else
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{
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(void) alg;
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MBEDTLS_MPI_CHK( mbedtls_ecdsa_sign( &ecp->grp, &r, &s, &ecp->d,
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hash, hash_length,
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mbedtls_psa_get_random,
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MBEDTLS_PSA_RANDOM_STATE ) );
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}
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MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &r,
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signature,
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curve_bytes ) );
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MBEDTLS_MPI_CHK( mbedtls_mpi_write_binary( &s,
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signature + curve_bytes,
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curve_bytes ) );
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cleanup:
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mbedtls_mpi_free( &r );
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mbedtls_mpi_free( &s );
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if( ret == 0 )
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*signature_length = 2 * curve_bytes;
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mbedtls_ecp_keypair_free( ecp );
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mbedtls_free( ecp );
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return( mbedtls_to_psa_error( ret ) );
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}
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psa_status_t mbedtls_psa_ecdsa_verify_hash(
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const psa_key_attributes_t *attributes,
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const uint8_t *key_buffer, size_t key_buffer_size,
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psa_algorithm_t alg, const uint8_t *hash, size_t hash_length,
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const uint8_t *signature, size_t signature_length )
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{
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psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
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mbedtls_ecp_keypair *ecp = NULL;
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int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
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size_t curve_bytes;
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mbedtls_mpi r, s;
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(void)alg;
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status = mbedtls_psa_ecp_load_representation( attributes->core.type,
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attributes->core.bits,
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key_buffer,
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key_buffer_size,
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&ecp );
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if( status != PSA_SUCCESS )
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return( status );
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curve_bytes = PSA_BITS_TO_BYTES( ecp->grp.pbits );
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mbedtls_mpi_init( &r );
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mbedtls_mpi_init( &s );
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if( signature_length != 2 * curve_bytes )
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{
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ret = MBEDTLS_ERR_ECP_VERIFY_FAILED;
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goto cleanup;
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}
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MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &r,
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signature,
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curve_bytes ) );
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MBEDTLS_MPI_CHK( mbedtls_mpi_read_binary( &s,
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signature + curve_bytes,
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curve_bytes ) );
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/* Check whether the public part is loaded. If not, load it. */
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if( mbedtls_ecp_is_zero( &ecp->Q ) )
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{
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MBEDTLS_MPI_CHK(
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mbedtls_ecp_mul( &ecp->grp, &ecp->Q, &ecp->d, &ecp->grp.G,
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mbedtls_psa_get_random, MBEDTLS_PSA_RANDOM_STATE ) );
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}
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ret = mbedtls_ecdsa_verify( &ecp->grp, hash, hash_length,
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&ecp->Q, &r, &s );
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|
|
cleanup:
|
|
mbedtls_mpi_free( &r );
|
|
mbedtls_mpi_free( &s );
|
|
mbedtls_ecp_keypair_free( ecp );
|
|
mbedtls_free( ecp );
|
|
|
|
return( mbedtls_to_psa_error( ret ) );
|
|
}
|
|
|
|
#endif /* defined(MBEDTLS_PSA_BUILTIN_ALG_ECDSA) || \
|
|
* defined(MBEDTLS_PSA_BUILTIN_ALG_DETERMINISTIC_ECDSA) */
|
|
|
|
/****************************************************************/
|
|
/* ECDH Key Agreement */
|
|
/****************************************************************/
|
|
|
|
#if defined(MBEDTLS_PSA_BUILTIN_ALG_ECDH)
|
|
psa_status_t mbedtls_psa_key_agreement_ecdh(
|
|
const psa_key_attributes_t *attributes,
|
|
const uint8_t *key_buffer, size_t key_buffer_size,
|
|
psa_algorithm_t alg, const uint8_t *peer_key, size_t peer_key_length,
|
|
uint8_t *shared_secret, size_t shared_secret_size,
|
|
size_t *shared_secret_length )
|
|
{
|
|
psa_status_t status;
|
|
if( ! PSA_KEY_TYPE_IS_ECC_KEY_PAIR( attributes->core.type ) ||
|
|
! PSA_ALG_IS_ECDH(alg) )
|
|
return( PSA_ERROR_INVALID_ARGUMENT );
|
|
mbedtls_ecp_keypair *ecp = NULL;
|
|
status = mbedtls_psa_ecp_load_representation(
|
|
attributes->core.type,
|
|
attributes->core.bits,
|
|
key_buffer,
|
|
key_buffer_size,
|
|
&ecp );
|
|
if( status != PSA_SUCCESS )
|
|
return( status );
|
|
mbedtls_ecp_keypair *their_key = NULL;
|
|
mbedtls_ecdh_context ecdh;
|
|
size_t bits = 0;
|
|
psa_ecc_family_t curve = mbedtls_ecc_group_to_psa( ecp->grp.id, &bits );
|
|
mbedtls_ecdh_init( &ecdh );
|
|
|
|
status = mbedtls_psa_ecp_load_representation(
|
|
PSA_KEY_TYPE_ECC_PUBLIC_KEY(curve),
|
|
bits,
|
|
peer_key,
|
|
peer_key_length,
|
|
&their_key );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ecdh_get_params( &ecdh, their_key, MBEDTLS_ECDH_THEIRS ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ecdh_get_params( &ecdh, ecp, MBEDTLS_ECDH_OURS ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
|
|
status = mbedtls_to_psa_error(
|
|
mbedtls_ecdh_calc_secret( &ecdh,
|
|
shared_secret_length,
|
|
shared_secret, shared_secret_size,
|
|
mbedtls_psa_get_random,
|
|
MBEDTLS_PSA_RANDOM_STATE ) );
|
|
if( status != PSA_SUCCESS )
|
|
goto exit;
|
|
if( PSA_BITS_TO_BYTES( bits ) != *shared_secret_length )
|
|
status = PSA_ERROR_CORRUPTION_DETECTED;
|
|
exit:
|
|
if( status != PSA_SUCCESS )
|
|
mbedtls_platform_zeroize( shared_secret, shared_secret_size );
|
|
mbedtls_ecdh_free( &ecdh );
|
|
mbedtls_ecp_keypair_free( their_key );
|
|
mbedtls_free( their_key );
|
|
mbedtls_ecp_keypair_free( ecp );
|
|
mbedtls_free( ecp );
|
|
return( status );
|
|
}
|
|
#endif /* MBEDTLS_PSA_BUILTIN_ALG_ECDH */
|
|
|
|
|
|
#endif /* MBEDTLS_PSA_CRYPTO_C */
|