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mbedtls/library/psa_crypto.c
Gilles Peskine 2f9c4dc5ad Add key management functions 
Define psa_key_type_t and a first stab at a few values.

New functions psa_import_key, psa_export_key, psa_destroy_key,
psa_get_key_information. Implement them for raw data and RSA.

Under the hood, create an in-memory, fixed-size keystore with room
for MBEDTLS_PSA_KEY_SLOT_COUNT - 1 keys.
2018-09-05 11:53:24 +03:00

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9.7 KiB
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/*
* PSA crypto layer on top of Mbed TLS crypto
*/
/* Copyright (C) 2018, ARM Limited, All Rights Reserved
* SPDX-License-Identifier: Apache-2.0
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* This file is part of mbed TLS (https://tls.mbed.org)
*/
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif
#if defined(MBEDTLS_PSA_CRYPTO_C)
#include "psa/crypto.h"
#include <stdlib.h>
#include <string.h>
#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#define mbedtls_calloc calloc
#define mbedtls_free free
#endif
#include "mbedtls/ctr_drbg.h"
#include "mbedtls/entropy.h"
#include "mbedtls/pk.h"
/* Implementation that should never be optimized out by the compiler */
static void mbedtls_zeroize( void *v, size_t n )
{
volatile unsigned char *p = v; while( n-- ) *p++ = 0;
}
/****************************************************************/
/* Global data, support functions and library management */
/****************************************************************/
/* Number of key slots (plus one because 0 is not used).
* The value is a compile-time constant for now, for simplicity. */
#define MBEDTLS_PSA_KEY_SLOT_COUNT 32
typedef struct {
psa_key_type_t type;
union {
struct raw_data {
uint8_t *data;
size_t bytes;
} raw;
#if defined(MBEDTLS_PK_C)
mbedtls_pk_context pk;
#endif /* MBEDTLS_PK_C */
} data;
} key_slot_t;
typedef struct {
int initialized;
mbedtls_entropy_context entropy;
mbedtls_ctr_drbg_context ctr_drbg;
key_slot_t key_slots[MBEDTLS_PSA_KEY_SLOT_COUNT];
} psa_global_data_t;
static psa_global_data_t global_data;
static psa_status_t mbedtls_to_psa_error( int ret )
{
switch( ret )
{
case 0:
return( PSA_SUCCESS );
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_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_TAMPERING_DETECTED );
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 );
default:
return( PSA_ERROR_UNKNOWN_ERROR );
}
}
/****************************************************************/
/* Key management */
/****************************************************************/
psa_status_t psa_import_key(psa_key_slot_t key,
psa_key_type_t type,
const uint8_t *data,
size_t data_length)
{
key_slot_t *slot;
if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT )
return( PSA_ERROR_INVALID_ARGUMENT );
slot = &global_data.key_slots[key];
if( slot->type != PSA_KEY_TYPE_NONE )
return( PSA_ERROR_OCCUPIED_SLOT );
if( type == PSA_KEY_TYPE_RAW_DATA )
{
if( data_length > SIZE_MAX / 8 )
return( PSA_ERROR_NOT_SUPPORTED );
slot->data.raw.data = mbedtls_calloc( 1, data_length );
if( slot->data.raw.data == NULL )
return( PSA_ERROR_INSUFFICIENT_MEMORY );
memcpy( slot->data.raw.data, data, data_length );
slot->data.raw.bytes = data_length;
}
else
#if defined(MBEDTLS_PK_C) && defined(MBEDTLS_PK_PARSE_C)
if( type == PSA_KEY_TYPE_RSA || PSA_KEY_TYPE_IS_ECC( type ) )
{
int ret;
mbedtls_pk_init( &slot->data.pk );
ret = mbedtls_pk_parse_key( &slot->data.pk,
data, data_length,
NULL, 0 );
if( ret != 0 )
return( mbedtls_to_psa_error( ret ) );
}
else
#endif /* defined(MBEDTLS_PK_C) && defined(MBEDTLS_PK_PARSE_C) */
{
return( PSA_ERROR_NOT_SUPPORTED );
}
slot->type = type;
return( PSA_SUCCESS );
}
psa_status_t psa_destroy_key(psa_key_slot_t key)
{
key_slot_t *slot;
if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT )
return( PSA_ERROR_INVALID_ARGUMENT );
slot = &global_data.key_slots[key];
if( slot->type == PSA_KEY_TYPE_NONE )
return( PSA_ERROR_EMPTY_SLOT );
if( slot->type == PSA_KEY_TYPE_RAW_DATA )
{
mbedtls_free( slot->data.raw.data );
}
else
#if defined(MBEDTLS_PK_C) && defined(MBEDTLS_PK_PARSE_C)
if( slot->type == PSA_KEY_TYPE_RSA ||
PSA_KEY_TYPE_IS_ECC( slot->type ) )
{
mbedtls_pk_free( &slot->data.pk );
}
else
#endif /* defined(MBEDTLS_PK_C) && defined(MBEDTLS_PK_PARSE_C) */
{
/* Shouldn't happen: the key type is not any type that we
* put it. */
return( PSA_ERROR_TAMPERING_DETECTED );
}
mbedtls_zeroize( slot, sizeof( *slot ) );
return( PSA_SUCCESS );
}
psa_status_t psa_get_key_information(psa_key_slot_t key,
psa_key_type_t *type,
size_t *bits)
{
key_slot_t *slot;
if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT )
return( PSA_ERROR_INVALID_ARGUMENT );
slot = &global_data.key_slots[key];
if( type != NULL )
*type = slot->type;
if( bits != NULL )
*bits = 0;
if( slot->type == PSA_KEY_TYPE_NONE )
return( PSA_ERROR_EMPTY_SLOT );
if( slot->type == PSA_KEY_TYPE_RAW_DATA )
{
if( bits != NULL )
*bits = slot->data.raw.bytes * 8;
}
else
#if defined(MBEDTLS_PK_C) && defined(MBEDTLS_PK_PARSE_C)
if( slot->type == PSA_KEY_TYPE_RSA ||
PSA_KEY_TYPE_IS_ECC( slot->type ) )
{
if( bits != NULL )
*bits = mbedtls_pk_get_bitlen( &slot->data.pk );
}
else
#endif /* defined(MBEDTLS_PK_C) && defined(MBEDTLS_PK_PARSE_C) */
{
/* Shouldn't happen: the key type is not any type that we
* put it. */
return( PSA_ERROR_TAMPERING_DETECTED );
}
return( PSA_SUCCESS );
}
psa_status_t psa_export_key(psa_key_slot_t key,
uint8_t *data,
size_t data_size,
size_t *data_length)
{
key_slot_t *slot;
if( key == 0 || key > MBEDTLS_PSA_KEY_SLOT_COUNT )
return( PSA_ERROR_INVALID_ARGUMENT );
slot = &global_data.key_slots[key];
if( slot->type == PSA_KEY_TYPE_NONE )
return( PSA_ERROR_EMPTY_SLOT );
if( slot->type == PSA_KEY_TYPE_RAW_DATA )
{
if( slot->data.raw.bytes > data_size )
return( PSA_ERROR_BUFFER_TOO_SMALL );
memcpy( data, slot->data.raw.data, slot->data.raw.bytes );
*data_length = slot->data.raw.bytes;
return( PSA_SUCCESS );
}
else
#if defined(MBEDTLS_PK_C) && defined(MBEDTLS_PK_PARSE_C)
if( slot->type == PSA_KEY_TYPE_RSA ||
PSA_KEY_TYPE_IS_ECC( slot->type ) )
{
int ret;
ret = mbedtls_pk_write_key_der( &slot->data.pk,
data, data_size );
if( ret < 0 )
return( mbedtls_to_psa_error( ret ) );
*data_length = ret;
return( PSA_SUCCESS );
}
else
#endif /* defined(MBEDTLS_PK_C) && defined(MBEDTLS_PK_PARSE_C) */
{
return( PSA_ERROR_NOT_SUPPORTED );
}
}
/****************************************************************/
/* Module setup */
/****************************************************************/
void mbedtls_psa_crypto_free( void )
{
size_t key;
for( key = 1; key < MBEDTLS_PSA_KEY_SLOT_COUNT; key++ )
psa_destroy_key( key );
mbedtls_ctr_drbg_free( &global_data.ctr_drbg );
mbedtls_entropy_free( &global_data.entropy );
mbedtls_zeroize( &global_data, sizeof( global_data ) );
}
psa_status_t psa_crypto_init( void )
{
int ret;
const unsigned char drbg_seed[] = "PSA";
if( global_data.initialized != 0 )
return( PSA_SUCCESS );
mbedtls_zeroize( &global_data, sizeof( global_data ) );
mbedtls_entropy_init( &global_data.entropy );
mbedtls_ctr_drbg_init( &global_data.ctr_drbg );
ret = mbedtls_ctr_drbg_seed( &global_data.ctr_drbg,
mbedtls_entropy_func,
&global_data.entropy,
drbg_seed, sizeof( drbg_seed ) - 1 );
if( ret != 0 )
goto exit;
exit:
if( ret != 0 )
mbedtls_psa_crypto_free( );
return( mbedtls_to_psa_error( ret ) );
}
#endif /* MBEDTLS_PSA_CRYPTO_C */
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