tests/src/drivers/platform_builtin_keys.c

/** \file platform_builtin_keys.c
 *
 * \brief Test driver implementation of the builtin key support
 */

/*
 *  Copyright The Mbed TLS Contributors
 *  SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later
 */

#include <test/helpers.h>

#include <psa/crypto.h>
#include <psa/crypto_extra.h>

#if defined(PSA_CRYPTO_DRIVER_TEST)
#include <test/drivers/test_driver.h>
#endif

typedef struct {
    psa_key_id_t builtin_key_id;
    psa_key_lifetime_t lifetime;
    psa_drv_slot_number_t slot_number;
} mbedtls_psa_builtin_key_description_t;

static const mbedtls_psa_builtin_key_description_t builtin_keys[] = {
#if defined(PSA_CRYPTO_DRIVER_TEST)
    /* For testing, assign the AES builtin key slot to the boundary values.
     * ECDSA can be exercised on key ID MBEDTLS_PSA_KEY_ID_BUILTIN_MIN + 1. */
    { MBEDTLS_PSA_KEY_ID_BUILTIN_MIN - 1,
      PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION(
          PSA_KEY_PERSISTENCE_READ_ONLY, PSA_CRYPTO_TEST_DRIVER_LOCATION),
      PSA_CRYPTO_TEST_DRIVER_BUILTIN_AES_KEY_SLOT },
    { MBEDTLS_PSA_KEY_ID_BUILTIN_MIN,
      PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION(
          PSA_KEY_PERSISTENCE_READ_ONLY, PSA_CRYPTO_TEST_DRIVER_LOCATION),
      PSA_CRYPTO_TEST_DRIVER_BUILTIN_AES_KEY_SLOT },
    { MBEDTLS_PSA_KEY_ID_BUILTIN_MIN + 1,
      PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION(
          PSA_KEY_PERSISTENCE_READ_ONLY, PSA_CRYPTO_TEST_DRIVER_LOCATION),
      PSA_CRYPTO_TEST_DRIVER_BUILTIN_ECDSA_KEY_SLOT },
    { MBEDTLS_PSA_KEY_ID_BUILTIN_MAX - 1,
      PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION(
          PSA_KEY_PERSISTENCE_READ_ONLY, PSA_CRYPTO_TEST_DRIVER_LOCATION),
      PSA_CRYPTO_TEST_DRIVER_BUILTIN_AES_KEY_SLOT },
    { MBEDTLS_PSA_KEY_ID_BUILTIN_MAX,
      PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION(
          PSA_KEY_PERSISTENCE_READ_ONLY, PSA_CRYPTO_TEST_DRIVER_LOCATION),
      PSA_CRYPTO_TEST_DRIVER_BUILTIN_AES_KEY_SLOT },
    { MBEDTLS_PSA_KEY_ID_BUILTIN_MAX + 1,
      PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION(
          PSA_KEY_PERSISTENCE_READ_ONLY, PSA_CRYPTO_TEST_DRIVER_LOCATION),
      PSA_CRYPTO_TEST_DRIVER_BUILTIN_AES_KEY_SLOT },
#else
    { 0, 0, 0 }
#endif
};

psa_status_t mbedtls_psa_platform_get_builtin_key(
    mbedtls_svc_key_id_t key_id,
    psa_key_lifetime_t *lifetime,
    psa_drv_slot_number_t *slot_number)
{
    psa_key_id_t app_key_id = MBEDTLS_SVC_KEY_ID_GET_KEY_ID(key_id);
    const mbedtls_psa_builtin_key_description_t *builtin_key;

    for (size_t i = 0;
         i < (sizeof(builtin_keys) / sizeof(builtin_keys[0])); i++) {
        builtin_key = &builtin_keys[i];
        if (builtin_key->builtin_key_id == app_key_id) {
            *lifetime = builtin_key->lifetime;
            *slot_number = builtin_key->slot_number;
            return PSA_SUCCESS;
        }
    }

    return PSA_ERROR_DOES_NOT_EXIST;
}