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mbedtls/library/pk.c
Manuel Pégourié-Gonnard 4dacf58d6d Take advantage of now-public macro in pk.c 
Used to be private, hence the duplication, but that's been fixed in the
meantime, I guess we just missed this occurrence.

Signed-off-by: Manuel Pégourié-Gonnard <manuel.pegourie-gonnard@arm.com>
2022-12-21 09:50:17 +01:00

904 lines
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/*
* Public Key abstraction layer
*
* 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_PK_C)
#include "mbedtls/pk.h"
#include "pk_wrap.h"
#include "pkwrite.h"
#include "hash_info.h"
#include "mbedtls/platform_util.h"
#include "mbedtls/error.h"
#if defined(MBEDTLS_RSA_C)
#include "mbedtls/rsa.h"
#endif
#if defined(MBEDTLS_ECP_C)
#include "mbedtls/ecp.h"
#endif
#if defined(MBEDTLS_ECDSA_C)
#include "mbedtls/ecdsa.h"
#endif
#if defined(MBEDTLS_PSA_CRYPTO_C)
#include "mbedtls/psa_util.h"
#endif
#include <limits.h>
#include <stdint.h>
/*
* Initialise a mbedtls_pk_context
*/
void mbedtls_pk_init( mbedtls_pk_context *ctx )
{
ctx->pk_info = NULL;
ctx->pk_ctx = NULL;
}
/*
* Free (the components of) a mbedtls_pk_context
*/
void mbedtls_pk_free( mbedtls_pk_context *ctx )
{
if( ctx == NULL )
return;
if ( ctx->pk_info != NULL )
ctx->pk_info->ctx_free_func( ctx->pk_ctx );
mbedtls_platform_zeroize( ctx, sizeof( mbedtls_pk_context ) );
}
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
/*
* Initialize a restart context
*/
void mbedtls_pk_restart_init( mbedtls_pk_restart_ctx *ctx )
{
ctx->pk_info = NULL;
ctx->rs_ctx = NULL;
}
/*
* Free the components of a restart context
*/
void mbedtls_pk_restart_free( mbedtls_pk_restart_ctx *ctx )
{
if( ctx == NULL || ctx->pk_info == NULL ||
ctx->pk_info->rs_free_func == NULL )
{
return;
}
ctx->pk_info->rs_free_func( ctx->rs_ctx );
ctx->pk_info = NULL;
ctx->rs_ctx = NULL;
}
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
/*
* Get pk_info structure from type
*/
const mbedtls_pk_info_t * mbedtls_pk_info_from_type( mbedtls_pk_type_t pk_type )
{
switch( pk_type ) {
#if defined(MBEDTLS_RSA_C)
case MBEDTLS_PK_RSA:
return( &mbedtls_rsa_info );
#endif
#if defined(MBEDTLS_ECP_C)
case MBEDTLS_PK_ECKEY:
return( &mbedtls_eckey_info );
case MBEDTLS_PK_ECKEY_DH:
return( &mbedtls_eckeydh_info );
#endif
#if defined(MBEDTLS_ECDSA_C)
case MBEDTLS_PK_ECDSA:
return( &mbedtls_ecdsa_info );
#endif
/* MBEDTLS_PK_RSA_ALT omitted on purpose */
default:
return( NULL );
}
}
/*
* Initialise context
*/
int mbedtls_pk_setup( mbedtls_pk_context *ctx, const mbedtls_pk_info_t *info )
{
if( info == NULL || ctx->pk_info != NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL )
return( MBEDTLS_ERR_PK_ALLOC_FAILED );
ctx->pk_info = info;
return( 0 );
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
/*
* Initialise a PSA-wrapping context
*/
int mbedtls_pk_setup_opaque( mbedtls_pk_context *ctx,
const mbedtls_svc_key_id_t key )
{
const mbedtls_pk_info_t *info = NULL;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
mbedtls_svc_key_id_t *pk_ctx;
psa_key_type_t type;
if( ctx == NULL || ctx->pk_info != NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
if( PSA_SUCCESS != psa_get_key_attributes( key, &attributes ) )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
type = psa_get_key_type( &attributes );
psa_reset_key_attributes( &attributes );
if( PSA_KEY_TYPE_IS_ECC_KEY_PAIR( type ) )
info = &mbedtls_pk_ecdsa_opaque_info;
else if( type == PSA_KEY_TYPE_RSA_KEY_PAIR )
info = &mbedtls_pk_rsa_opaque_info;
else
return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL )
return( MBEDTLS_ERR_PK_ALLOC_FAILED );
ctx->pk_info = info;
pk_ctx = (mbedtls_svc_key_id_t *) ctx->pk_ctx;
*pk_ctx = key;
return( 0 );
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#if defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
/*
* Initialize an RSA-alt context
*/
int mbedtls_pk_setup_rsa_alt( mbedtls_pk_context *ctx, void * key,
mbedtls_pk_rsa_alt_decrypt_func decrypt_func,
mbedtls_pk_rsa_alt_sign_func sign_func,
mbedtls_pk_rsa_alt_key_len_func key_len_func )
{
mbedtls_rsa_alt_context *rsa_alt;
const mbedtls_pk_info_t *info = &mbedtls_rsa_alt_info;
if( ctx->pk_info != NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
if( ( ctx->pk_ctx = info->ctx_alloc_func() ) == NULL )
return( MBEDTLS_ERR_PK_ALLOC_FAILED );
ctx->pk_info = info;
rsa_alt = (mbedtls_rsa_alt_context *) ctx->pk_ctx;
rsa_alt->key = key;
rsa_alt->decrypt_func = decrypt_func;
rsa_alt->sign_func = sign_func;
rsa_alt->key_len_func = key_len_func;
return( 0 );
}
#endif /* MBEDTLS_PK_RSA_ALT_SUPPORT */
/*
* Tell if a PK can do the operations of the given type
*/
int mbedtls_pk_can_do( const mbedtls_pk_context *ctx, mbedtls_pk_type_t type )
{
/* A context with null pk_info is not set up yet and can't do anything.
* For backward compatibility, also accept NULL instead of a context
* pointer. */
if( ctx == NULL || ctx->pk_info == NULL )
return( 0 );
return( ctx->pk_info->can_do( type ) );
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
/*
* Tell if a PK can do the operations of the given PSA algorithm
*/
int mbedtls_pk_can_do_ext( const mbedtls_pk_context *ctx, psa_algorithm_t alg,
psa_key_usage_t usage )
{
psa_key_usage_t key_usage;
/* A context with null pk_info is not set up yet and can't do anything.
* For backward compatibility, also accept NULL instead of a context
* pointer. */
if( ctx == NULL || ctx->pk_info == NULL )
return( 0 );
/* Filter out non allowed algorithms */
if( PSA_ALG_IS_ECDSA( alg ) == 0 &&
PSA_ALG_IS_RSA_PKCS1V15_SIGN( alg ) == 0 &&
PSA_ALG_IS_RSA_PSS( alg ) == 0 &&
alg != PSA_ALG_RSA_PKCS1V15_CRYPT &&
PSA_ALG_IS_ECDH( alg ) == 0 )
return( 0 );
/* Filter out non allowed usage flags */
if( usage == 0 ||
( usage & ~( PSA_KEY_USAGE_SIGN_HASH |
PSA_KEY_USAGE_DECRYPT |
PSA_KEY_USAGE_DERIVE ) ) != 0 )
return( 0 );
/* Wildcard hash is not allowed */
if( PSA_ALG_IS_SIGN_HASH( alg ) &&
PSA_ALG_SIGN_GET_HASH( alg ) == PSA_ALG_ANY_HASH )
return( 0 );
if( mbedtls_pk_get_type( ctx ) != MBEDTLS_PK_OPAQUE )
{
mbedtls_pk_type_t type;
if( PSA_ALG_IS_ECDSA( alg ) || PSA_ALG_IS_ECDH( alg ) )
type = MBEDTLS_PK_ECKEY;
else if( PSA_ALG_IS_RSA_PKCS1V15_SIGN( alg ) ||
alg == PSA_ALG_RSA_PKCS1V15_CRYPT )
type = MBEDTLS_PK_RSA;
else if( PSA_ALG_IS_RSA_PSS( alg ) )
type = MBEDTLS_PK_RSASSA_PSS;
else
return( 0 );
if( ctx->pk_info->can_do( type ) == 0 )
return( 0 );
switch( type )
{
case MBEDTLS_PK_ECKEY:
key_usage = PSA_KEY_USAGE_SIGN_HASH | PSA_KEY_USAGE_DERIVE;
break;
case MBEDTLS_PK_RSA:
case MBEDTLS_PK_RSASSA_PSS:
key_usage = PSA_KEY_USAGE_SIGN_HASH |
PSA_KEY_USAGE_SIGN_MESSAGE |
PSA_KEY_USAGE_DECRYPT;
break;
default:
/* Should never happen */
return( 0 );
}
return( ( key_usage & usage ) == usage );
}
const mbedtls_svc_key_id_t *key = (const mbedtls_svc_key_id_t *) ctx->pk_ctx;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_algorithm_t key_alg, key_alg2;
psa_status_t status;
status = psa_get_key_attributes( *key, &attributes );
if( status != PSA_SUCCESS )
return( 0 );
key_alg = psa_get_key_algorithm( &attributes );
key_alg2 = psa_get_key_enrollment_algorithm( &attributes );
key_usage = psa_get_key_usage_flags( &attributes );
psa_reset_key_attributes( &attributes );
if( ( key_usage & usage ) != usage )
return( 0 );
/*
* Common case: the key alg or alg2 only allows alg.
* This will match PSA_ALG_RSA_PKCS1V15_CRYPT & PSA_ALG_IS_ECDH
* directly.
* This would also match ECDSA/RSA_PKCS1V15_SIGN/RSA_PSS with
* a fixed hash on key_alg/key_alg2.
*/
if( alg == key_alg || alg == key_alg2 )
return( 1 );
/*
* If key_alg or key_alg2 is a hash-and-sign with a wildcard for the hash,
* and alg is the same hash-and-sign family with any hash,
* then alg is compliant with this key alg
*/
if( PSA_ALG_IS_SIGN_HASH( alg ) )
{
if( PSA_ALG_IS_SIGN_HASH( key_alg ) &&
PSA_ALG_SIGN_GET_HASH( key_alg ) == PSA_ALG_ANY_HASH &&
( alg & ~PSA_ALG_HASH_MASK ) == ( key_alg & ~PSA_ALG_HASH_MASK ) )
return( 1 );
if( PSA_ALG_IS_SIGN_HASH( key_alg2 ) &&
PSA_ALG_SIGN_GET_HASH( key_alg2 ) == PSA_ALG_ANY_HASH &&
( alg & ~PSA_ALG_HASH_MASK ) == ( key_alg2 & ~PSA_ALG_HASH_MASK ) )
return( 1 );
}
return( 0 );
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
/*
* Helper for mbedtls_pk_sign and mbedtls_pk_verify
*/
static inline int pk_hashlen_helper( mbedtls_md_type_t md_alg, size_t *hash_len )
{
if( *hash_len != 0 )
return( 0 );
*hash_len = mbedtls_hash_info_get_size( md_alg );
if( *hash_len == 0 )
return( -1 );
return( 0 );
}
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
/*
* Helper to set up a restart context if needed
*/
static int pk_restart_setup( mbedtls_pk_restart_ctx *ctx,
const mbedtls_pk_info_t *info )
{
/* Don't do anything if already set up or invalid */
if( ctx == NULL || ctx->pk_info != NULL )
return( 0 );
/* Should never happen when we're called */
if( info->rs_alloc_func == NULL || info->rs_free_func == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
if( ( ctx->rs_ctx = info->rs_alloc_func() ) == NULL )
return( MBEDTLS_ERR_PK_ALLOC_FAILED );
ctx->pk_info = info;
return( 0 );
}
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
/*
* Verify a signature (restartable)
*/
int mbedtls_pk_verify_restartable( mbedtls_pk_context *ctx,
mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len,
mbedtls_pk_restart_ctx *rs_ctx )
{
if( ( md_alg != MBEDTLS_MD_NONE || hash_len != 0 ) && hash == NULL )
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
if( ctx->pk_info == NULL ||
pk_hashlen_helper( md_alg, &hash_len ) != 0 )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
/* optimization: use non-restartable version if restart disabled */
if( rs_ctx != NULL &&
mbedtls_ecp_restart_is_enabled() &&
ctx->pk_info->verify_rs_func != NULL )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if( ( ret = pk_restart_setup( rs_ctx, ctx->pk_info ) ) != 0 )
return( ret );
ret = ctx->pk_info->verify_rs_func( ctx->pk_ctx,
md_alg, hash, hash_len, sig, sig_len, rs_ctx->rs_ctx );
if( ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
mbedtls_pk_restart_free( rs_ctx );
return( ret );
}
#else /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
(void) rs_ctx;
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
if( ctx->pk_info->verify_func == NULL )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
return( ctx->pk_info->verify_func( ctx->pk_ctx, md_alg, hash, hash_len,
sig, sig_len ) );
}
/*
* Verify a signature
*/
int mbedtls_pk_verify( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len )
{
return( mbedtls_pk_verify_restartable( ctx, md_alg, hash, hash_len,
sig, sig_len, NULL ) );
}
/*
* Verify a signature with options
*/
int mbedtls_pk_verify_ext( mbedtls_pk_type_t type, const void *options,
mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
const unsigned char *sig, size_t sig_len )
{
if( ( md_alg != MBEDTLS_MD_NONE || hash_len != 0 ) && hash == NULL )
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
if( ctx->pk_info == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
if( ! mbedtls_pk_can_do( ctx, type ) )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
if( type != MBEDTLS_PK_RSASSA_PSS )
{
/* General case: no options */
if( options != NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
return( mbedtls_pk_verify( ctx, md_alg, hash, hash_len, sig, sig_len ) );
}
#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PKCS1_V21)
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
const mbedtls_pk_rsassa_pss_options *pss_opts;
#if SIZE_MAX > UINT_MAX
if( md_alg == MBEDTLS_MD_NONE && UINT_MAX < hash_len )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#endif /* SIZE_MAX > UINT_MAX */
if( options == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
pss_opts = (const mbedtls_pk_rsassa_pss_options *) options;
#if defined(MBEDTLS_USE_PSA_CRYPTO)
if( pss_opts->mgf1_hash_id == md_alg )
{
unsigned char buf[MBEDTLS_PK_RSA_PUB_DER_MAX_BYTES];
unsigned char *p;
int key_len;
size_t signature_length;
psa_status_t status = PSA_ERROR_DATA_CORRUPT;
psa_status_t destruction_status = PSA_ERROR_DATA_CORRUPT;
psa_algorithm_t psa_md_alg = mbedtls_hash_info_psa_from_md( md_alg );
mbedtls_svc_key_id_t key_id = MBEDTLS_SVC_KEY_ID_INIT;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_algorithm_t psa_sig_alg = PSA_ALG_RSA_PSS_ANY_SALT( psa_md_alg );
p = buf + sizeof( buf );
key_len = mbedtls_pk_write_pubkey( &p, buf, ctx );
if( key_len < 0 )
return( key_len );
psa_set_key_type( &attributes, PSA_KEY_TYPE_RSA_PUBLIC_KEY );
psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_VERIFY_HASH );
psa_set_key_algorithm( &attributes, psa_sig_alg );
status = psa_import_key( &attributes,
buf + sizeof( buf ) - key_len, key_len,
&key_id );
if( status != PSA_SUCCESS )
{
psa_destroy_key( key_id );
return( mbedtls_pk_error_from_psa( status ) );
}
/* This function requires returning MBEDTLS_ERR_PK_SIG_LEN_MISMATCH
* on a valid signature with trailing data in a buffer, but
* mbedtls_psa_rsa_verify_hash requires the sig_len to be exact,
* so for this reason the passed sig_len is overwritten. Smaller
* signature lengths should not be accepted for verification. */
signature_length = sig_len > mbedtls_pk_get_len( ctx ) ?
mbedtls_pk_get_len( ctx ) : sig_len;
status = psa_verify_hash( key_id, psa_sig_alg, hash,
hash_len, sig, signature_length );
destruction_status = psa_destroy_key( key_id );
if( status == PSA_SUCCESS && sig_len > mbedtls_pk_get_len( ctx ) )
return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
if( status == PSA_SUCCESS )
status = destruction_status;
return( mbedtls_pk_error_from_psa_rsa( status ) );
}
else
#endif
{
if( sig_len < mbedtls_pk_get_len( ctx ) )
return( MBEDTLS_ERR_RSA_VERIFY_FAILED );
ret = mbedtls_rsa_rsassa_pss_verify_ext( mbedtls_pk_rsa( *ctx ),
md_alg, (unsigned int) hash_len, hash,
pss_opts->mgf1_hash_id,
pss_opts->expected_salt_len,
sig );
if( ret != 0 )
return( ret );
if( sig_len > mbedtls_pk_get_len( ctx ) )
return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
return( 0 );
}
#else
return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
#endif /* MBEDTLS_RSA_C && MBEDTLS_PKCS1_V21 */
}
/*
* Make a signature (restartable)
*/
int mbedtls_pk_sign_restartable( mbedtls_pk_context *ctx,
mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
mbedtls_pk_restart_ctx *rs_ctx )
{
if( ( md_alg != MBEDTLS_MD_NONE || hash_len != 0 ) && hash == NULL )
return MBEDTLS_ERR_PK_BAD_INPUT_DATA;
if( ctx->pk_info == NULL || pk_hashlen_helper( md_alg, &hash_len ) != 0 )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#if defined(MBEDTLS_ECDSA_C) && defined(MBEDTLS_ECP_RESTARTABLE)
/* optimization: use non-restartable version if restart disabled */
if( rs_ctx != NULL &&
mbedtls_ecp_restart_is_enabled() &&
ctx->pk_info->sign_rs_func != NULL )
{
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
if( ( ret = pk_restart_setup( rs_ctx, ctx->pk_info ) ) != 0 )
return( ret );
ret = ctx->pk_info->sign_rs_func( ctx->pk_ctx, md_alg,
hash, hash_len,
sig, sig_size, sig_len,
f_rng, p_rng, rs_ctx->rs_ctx );
if( ret != MBEDTLS_ERR_ECP_IN_PROGRESS )
mbedtls_pk_restart_free( rs_ctx );
return( ret );
}
#else /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
(void) rs_ctx;
#endif /* MBEDTLS_ECDSA_C && MBEDTLS_ECP_RESTARTABLE */
if( ctx->pk_info->sign_func == NULL )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
return( ctx->pk_info->sign_func( ctx->pk_ctx, md_alg,
hash, hash_len,
sig, sig_size, sig_len,
f_rng, p_rng ) );
}
/*
* Make a signature
*/
int mbedtls_pk_sign( mbedtls_pk_context *ctx, mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{
return( mbedtls_pk_sign_restartable( ctx, md_alg, hash, hash_len,
sig, sig_size, sig_len,
f_rng, p_rng, NULL ) );
}
#if defined(MBEDTLS_PSA_CRYPTO_C)
/*
* Make a signature given a signature type.
*/
int mbedtls_pk_sign_ext( mbedtls_pk_type_t pk_type,
mbedtls_pk_context *ctx,
mbedtls_md_type_t md_alg,
const unsigned char *hash, size_t hash_len,
unsigned char *sig, size_t sig_size, size_t *sig_len,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
#if defined(MBEDTLS_RSA_C)
psa_algorithm_t psa_md_alg;
#endif /* MBEDTLS_RSA_C */
*sig_len = 0;
if( ctx->pk_info == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
if( ! mbedtls_pk_can_do( ctx, pk_type ) )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
if( pk_type != MBEDTLS_PK_RSASSA_PSS )
{
return( mbedtls_pk_sign( ctx, md_alg, hash, hash_len,
sig, sig_size, sig_len, f_rng, p_rng ) );
}
#if defined(MBEDTLS_RSA_C)
psa_md_alg = mbedtls_hash_info_psa_from_md( md_alg );
if( psa_md_alg == 0 )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
if( mbedtls_pk_get_type( ctx ) == MBEDTLS_PK_OPAQUE )
{
const mbedtls_svc_key_id_t *key = (const mbedtls_svc_key_id_t *) ctx->pk_ctx;
psa_status_t status;
status = psa_sign_hash( *key, PSA_ALG_RSA_PSS( psa_md_alg ),
hash, hash_len,
sig, sig_size, sig_len );
return( mbedtls_pk_error_from_psa_rsa( status ) );
}
return( mbedtls_pk_psa_rsa_sign_ext( PSA_ALG_RSA_PSS( psa_md_alg ),
ctx->pk_ctx, hash, hash_len,
sig, sig_size, sig_len ) );
#else /* MBEDTLS_RSA_C */
return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
#endif /* !MBEDTLS_RSA_C */
}
#endif /* MBEDTLS_PSA_CRYPTO_C */
/*
* Decrypt message
*/
int mbedtls_pk_decrypt( mbedtls_pk_context *ctx,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{
if( ctx->pk_info == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
if( ctx->pk_info->decrypt_func == NULL )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
return( ctx->pk_info->decrypt_func( ctx->pk_ctx, input, ilen,
output, olen, osize, f_rng, p_rng ) );
}
/*
* Encrypt message
*/
int mbedtls_pk_encrypt( mbedtls_pk_context *ctx,
const unsigned char *input, size_t ilen,
unsigned char *output, size_t *olen, size_t osize,
int (*f_rng)(void *, unsigned char *, size_t), void *p_rng )
{
if( ctx->pk_info == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
if( ctx->pk_info->encrypt_func == NULL )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
return( ctx->pk_info->encrypt_func( ctx->pk_ctx, input, ilen,
output, olen, osize, f_rng, p_rng ) );
}
/*
* Check public-private key pair
*/
int mbedtls_pk_check_pair( const mbedtls_pk_context *pub,
const mbedtls_pk_context *prv,
int (*f_rng)(void *, unsigned char *, size_t),
void *p_rng )
{
if( pub->pk_info == NULL ||
prv->pk_info == NULL )
{
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
}
if( f_rng == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
if( prv->pk_info->check_pair_func == NULL )
return( MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
if( prv->pk_info->type == MBEDTLS_PK_RSA_ALT )
{
if( pub->pk_info->type != MBEDTLS_PK_RSA )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
}
else
{
if( pub->pk_info != prv->pk_info )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
}
return( prv->pk_info->check_pair_func( pub->pk_ctx, prv->pk_ctx, f_rng, p_rng ) );
}
/*
* Get key size in bits
*/
size_t mbedtls_pk_get_bitlen( const mbedtls_pk_context *ctx )
{
/* For backward compatibility, accept NULL or a context that
* isn't set up yet, and return a fake value that should be safe. */
if( ctx == NULL || ctx->pk_info == NULL )
return( 0 );
return( ctx->pk_info->get_bitlen( ctx->pk_ctx ) );
}
/*
* Export debug information
*/
int mbedtls_pk_debug( const mbedtls_pk_context *ctx, mbedtls_pk_debug_item *items )
{
if( ctx->pk_info == NULL )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
if( ctx->pk_info->debug_func == NULL )
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
ctx->pk_info->debug_func( ctx->pk_ctx, items );
return( 0 );
}
/*
* Access the PK type name
*/
const char *mbedtls_pk_get_name( const mbedtls_pk_context *ctx )
{
if( ctx == NULL || ctx->pk_info == NULL )
return( "invalid PK" );
return( ctx->pk_info->name );
}
/*
* Access the PK type
*/
mbedtls_pk_type_t mbedtls_pk_get_type( const mbedtls_pk_context *ctx )
{
if( ctx == NULL || ctx->pk_info == NULL )
return( MBEDTLS_PK_NONE );
return( ctx->pk_info->type );
}
#if defined(MBEDTLS_USE_PSA_CRYPTO)
/*
* Load the key to a PSA key slot,
* then turn the PK context into a wrapper for that key slot.
*
* Currently only works for EC & RSA private keys.
*/
int mbedtls_pk_wrap_as_opaque( mbedtls_pk_context *pk,
mbedtls_svc_key_id_t *key,
psa_algorithm_t alg,
psa_key_usage_t usage,
psa_algorithm_t alg2 )
{
#if !defined(MBEDTLS_ECP_C) && !defined(MBEDTLS_RSA_C)
((void) pk);
((void) key);
((void) alg);
((void) usage);
((void) alg2);
#else
#if defined(MBEDTLS_ECP_C)
if( mbedtls_pk_get_type( pk ) == MBEDTLS_PK_ECKEY )
{
const mbedtls_ecp_keypair *ec;
unsigned char d[MBEDTLS_ECP_MAX_BYTES];
size_t d_len;
psa_ecc_family_t curve_id;
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
psa_key_type_t key_type;
size_t bits;
int ret = MBEDTLS_ERR_ERROR_CORRUPTION_DETECTED;
psa_status_t status;
/* export the private key material in the format PSA wants */
ec = mbedtls_pk_ec( *pk );
d_len = PSA_BITS_TO_BYTES( ec->grp.nbits );
if( ( ret = mbedtls_mpi_write_binary( &ec->d, d, d_len ) ) != 0 )
return( ret );
curve_id = mbedtls_ecc_group_to_psa( ec->grp.id, &bits );
key_type = PSA_KEY_TYPE_ECC_KEY_PAIR( curve_id );
/* prepare the key attributes */
psa_set_key_type( &attributes, key_type );
psa_set_key_bits( &attributes, bits );
psa_set_key_usage_flags( &attributes, usage );
psa_set_key_algorithm( &attributes, alg );
if( alg2 != PSA_ALG_NONE )
psa_set_key_enrollment_algorithm( &attributes, alg2 );
/* import private key into PSA */
status = psa_import_key( &attributes, d, d_len, key );
if( status != PSA_SUCCESS )
return( mbedtls_pk_error_from_psa( status ) );
/* make PK context wrap the key slot */
mbedtls_pk_free( pk );
mbedtls_pk_init( pk );
return( mbedtls_pk_setup_opaque( pk, *key ) );
}
else
#endif /* MBEDTLS_ECP_C */
#if defined(MBEDTLS_RSA_C)
if( mbedtls_pk_get_type( pk ) == MBEDTLS_PK_RSA )
{
unsigned char buf[MBEDTLS_PK_RSA_PRV_DER_MAX_BYTES];
psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
int key_len;
psa_status_t status;
/* export the private key material in the format PSA wants */
key_len = mbedtls_pk_write_key_der( pk, buf, sizeof( buf ) );
if( key_len <= 0 )
return( MBEDTLS_ERR_PK_BAD_INPUT_DATA );
/* prepare the key attributes */
psa_set_key_type( &attributes, PSA_KEY_TYPE_RSA_KEY_PAIR );
psa_set_key_bits( &attributes, mbedtls_pk_get_bitlen( pk ) );
psa_set_key_usage_flags( &attributes, usage );
psa_set_key_algorithm( &attributes, alg );
if( alg2 != PSA_ALG_NONE )
psa_set_key_enrollment_algorithm( &attributes, alg2 );
/* import private key into PSA */
status = psa_import_key( &attributes,
buf + sizeof( buf ) - key_len,
key_len, key);
mbedtls_platform_zeroize( buf, sizeof( buf ) );
if( status != PSA_SUCCESS )
return( mbedtls_pk_error_from_psa( status ) );
/* make PK context wrap the key slot */
mbedtls_pk_free( pk );
mbedtls_pk_init( pk );
return( mbedtls_pk_setup_opaque( pk, *key ) );
}
else
#endif /* MBEDTLS_RSA_C */
#endif /* !MBEDTLS_ECP_C && !MBEDTLS_RSA_C */
return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
}
#endif /* MBEDTLS_USE_PSA_CRYPTO */
#endif /* MBEDTLS_PK_C */
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