mbedtls/tests/suites/test_suite_psa_crypto_se_driver_hal.function

/* BEGIN_HEADER */
#include "test/psa_crypto_helpers.h"
#include "psa/crypto_se_driver.h"

#include "psa_crypto_se.h"
#include "psa_crypto_slot_management.h"
#include "psa_crypto_storage.h"

/* Invasive peeking: check the persistent data */
#if defined(MBEDTLS_PSA_ITS_FILE_C)
#include "psa_crypto_its.h"
#else /* Native ITS implementation */
#include "psa/error.h"
#include "psa/internal_trusted_storage.h"
#endif


/****************************************************************/
/* Test driver helpers */
/****************************************************************/

/** The minimum valid location value for a secure element driver. */
#define MIN_DRIVER_LOCATION 1

/** The location and lifetime used for tests that use a single driver. */
#define TEST_DRIVER_LOCATION 1
#define TEST_SE_PERSISTENT_LIFETIME                             \
    ( PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION(           \
        PSA_KEY_PERSISTENCE_DEFAULT, TEST_DRIVER_LOCATION ) )

#define TEST_SE_VOLATILE_LIFETIME                               \
    ( PSA_KEY_LIFETIME_FROM_PERSISTENCE_AND_LOCATION(           \
        PSA_KEY_PERSISTENCE_VOLATILE, TEST_DRIVER_LOCATION ) )

/** The driver detected a condition that shouldn't happen.
 * This is probably a bug in the library. */
#define PSA_ERROR_DETECTED_BY_DRIVER ((psa_status_t)( -500 ))

/** Like #TEST_ASSERT for use in a driver method, with no cleanup.
 *
 * If an error happens, this macro returns from the calling function.
 *
 * Use this macro to assert on guarantees provided by the core.
 */
#define DRIVER_ASSERT_RETURN( TEST )                        \
    do {                                                    \
       if( ! (TEST) )                                       \
       {                                                    \
          test_fail( #TEST, __LINE__, __FILE__ );           \
          return( PSA_ERROR_DETECTED_BY_DRIVER );           \
       }                                                    \
    } while( 0 )

/** Like #TEST_ASSERT for use in a driver method, with cleanup.
 *
 * In case of error, this macro sets `status` and jumps to the
 * label `exit`.
 *
 * Use this macro to assert on guarantees provided by the core.
 */
#define DRIVER_ASSERT( TEST )                               \
    do {                                                    \
       if( ! (TEST) )                                       \
       {                                                    \
          test_fail( #TEST, __LINE__, __FILE__ );           \
          status = PSA_ERROR_DETECTED_BY_DRIVER;            \
          goto exit;                                        \
       }                                                    \
    } while( 0 )

/** Like #PSA_ASSERT for a PSA API call that calls a driver underneath.
 *
 * Run the code \p expr. If this returns \p expected_status,
 * do nothing. If this returns #PSA_ERROR_DETECTED_BY_DRIVER,
 * jump directly to the `exit` label. If this returns any other
 * status, call test_fail() then jump to `exit`.
 *
 * The special case for #PSA_ERROR_DETECTED_BY_DRIVER is because in this
 * case, the test driver code is expected to have called test_fail()
 * already, so we make sure not to overwrite the failure information.
 */
#define PSA_ASSERT_VIA_DRIVER( expr, expected_status )                  \
    do {                                                                \
        psa_status_t PSA_ASSERT_VIA_DRIVER_status = ( expr );           \
        if( PSA_ASSERT_VIA_DRIVER_status == PSA_ERROR_DETECTED_BY_DRIVER ) \
            goto exit;                                                  \
        if( PSA_ASSERT_VIA_DRIVER_status != ( expected_status ) )       \
        {                                                               \
            test_fail( #expr, __LINE__, __FILE__ );                     \
            goto exit;                                                  \
        }                                                               \
    } while( 0 )



/****************************************************************/
/* Domain support functions */
/****************************************************************/

/* Return the exact bit size given a curve family and a byte length. */
static size_t ecc_curve_bits( psa_ecc_family_t curve, size_t data_length )
{
    switch( curve )
    {
        case PSA_ECC_FAMILY_SECP_R1:
            if( data_length == PSA_BYTES_TO_BITS( 521 ) )
                return( 521 );
            break;
        case PSA_ECC_FAMILY_MONTGOMERY:
            if( data_length == PSA_BYTES_TO_BITS( 255 ) )
                return( 255 );
    }
    /* If not listed above, assume a multiple of 8 bits. */
    return( PSA_BYTES_TO_BITS( data_length ) );
}


/****************************************************************/
/* Miscellaneous driver methods */
/****************************************************************/

typedef struct
{
    psa_key_slot_number_t slot_number;
    psa_key_creation_method_t method;
    psa_status_t status;
} validate_slot_number_directions_t;
static validate_slot_number_directions_t validate_slot_number_directions;

/* Validate a choice of slot number as directed. */
static psa_status_t validate_slot_number_as_directed(
    psa_drv_se_context_t *context,
    void *persistent_data,
    const psa_key_attributes_t *attributes,
    psa_key_creation_method_t method,
    psa_key_slot_number_t slot_number )
{
    (void) context;
    (void) persistent_data;
    (void) attributes;
    DRIVER_ASSERT_RETURN( slot_number ==
                          validate_slot_number_directions.slot_number );
    DRIVER_ASSERT_RETURN( method ==
                          validate_slot_number_directions.method );
    return( validate_slot_number_directions.status );
}

/* Allocate slot numbers with a monotonic counter. */
static psa_key_slot_number_t shadow_counter;
static void counter_reset( void )
{
    shadow_counter = 0;
}
static psa_status_t counter_allocate( psa_drv_se_context_t *context,
                                      void *persistent_data,
                                      const psa_key_attributes_t *attributes,
                                      psa_key_creation_method_t method,
                                      psa_key_slot_number_t *slot_number )
{
    psa_key_slot_number_t *p_counter = persistent_data;
    (void) attributes;
    (void) method;
    if( context->persistent_data_size != sizeof( psa_key_slot_number_t ) )
        return( PSA_ERROR_DETECTED_BY_DRIVER );
    ++*p_counter;
    if( *p_counter == 0 )
        return( PSA_ERROR_INSUFFICIENT_STORAGE );
    shadow_counter = *p_counter;
    *slot_number = *p_counter;
    return( PSA_SUCCESS );
}

/* Null import: do nothing, but pretend it worked. */
static psa_status_t null_import( psa_drv_se_context_t *context,
                                 psa_key_slot_number_t slot_number,
                                 const psa_key_attributes_t *attributes,
                                 const uint8_t *data,
                                 size_t data_length,
                                 size_t *bits )
{
    (void) context;
    (void) slot_number;
    (void) attributes;
    (void) data;
    /* We're supposed to return a key size. Return one that's correct for
     * plain data keys. */
    *bits = PSA_BYTES_TO_BITS( data_length );
    return( PSA_SUCCESS );
}

/* Null generate: do nothing, but pretend it worked. */
static psa_status_t null_generate( psa_drv_se_context_t *context,
                                   psa_key_slot_number_t slot_number,
                                   const psa_key_attributes_t *attributes,
                                   uint8_t *pubkey,
                                   size_t pubkey_size,
                                   size_t *pubkey_length )
{
    (void) context;
    (void) slot_number;
    (void) attributes;

    DRIVER_ASSERT_RETURN( *pubkey_length == 0 );
    if( ! PSA_KEY_TYPE_IS_KEY_PAIR( psa_get_key_type( attributes ) ) )
    {
        DRIVER_ASSERT_RETURN( pubkey == NULL );
        DRIVER_ASSERT_RETURN( pubkey_size == 0 );
    }

    return( PSA_SUCCESS );
}

/* Null destroy: do nothing, but pretend it worked. */
static psa_status_t null_destroy( psa_drv_se_context_t *context,
                                  void *persistent_data,
                                  psa_key_slot_number_t slot_number )
{
    (void) context;
    (void) persistent_data;
    (void) slot_number;
    return( PSA_SUCCESS );
}



/****************************************************************/
/* RAM-based test driver */
/****************************************************************/

#define RAM_MAX_KEY_SIZE 64
typedef struct
{
    psa_key_lifetime_t lifetime;
    psa_key_type_t type;
    size_t bits;
    uint8_t content[RAM_MAX_KEY_SIZE];
} ram_slot_t;
static ram_slot_t ram_slots[16];

/* A type with at least ARRAY_LENGTH(ram_slots) bits, containing a
 * bit vector indicating which slots are in use. */
typedef uint16_t ram_slot_usage_t;

static ram_slot_usage_t ram_shadow_slot_usage;

static uint8_t ram_min_slot = 0;

static void ram_slots_reset( void )
{
    memset( ram_slots, 0, sizeof( ram_slots ) );
    ram_min_slot = 0;
    ram_shadow_slot_usage = 0;
}

/* Common parts of key creation.
 *
 * In case of error, zero out ram_slots[slot_number]. But don't
 * do that if the error is PSA_ERROR_DETECTED_BY_DRIVER: in this case
 * you don't need to clean up (ram_slot_reset() will take care of it
 * in the test case function's cleanup code) and it might be wrong
 * (if slot_number is invalid).
 */
static psa_status_t ram_create_common( psa_drv_se_context_t *context,
                                       psa_key_slot_number_t slot_number,
                                       const psa_key_attributes_t *attributes,
                                       size_t required_storage )
{
    (void) context;
    DRIVER_ASSERT_RETURN( slot_number < ARRAY_LENGTH( ram_slots ) );

    ram_slots[slot_number].lifetime = psa_get_key_lifetime( attributes );
    ram_slots[slot_number].type = psa_get_key_type( attributes );
    ram_slots[slot_number].bits = psa_get_key_bits( attributes );

    if( required_storage > sizeof( ram_slots[slot_number].content ) )
    {
        memset( &ram_slots[slot_number], 0, sizeof( ram_slots[slot_number] ) );
        return( PSA_ERROR_INSUFFICIENT_STORAGE );
    }

    return( PSA_SUCCESS );
}

/* This function does everything except actually generating key material.
 * After calling it, you must copy the desired key material to
 * ram_slots[slot_number].content. */
static psa_status_t ram_fake_generate( psa_drv_se_context_t *context,
                                       psa_key_slot_number_t slot_number,
                                       const psa_key_attributes_t *attributes,
                                       uint8_t *pubkey,
                                       size_t pubkey_size,
                                       size_t *pubkey_length )
{
    psa_status_t status;
    size_t required_storage =
        PSA_KEY_EXPORT_MAX_SIZE( psa_get_key_type( attributes ),
                                 psa_get_key_bits( attributes ) );

    DRIVER_ASSERT_RETURN( *pubkey_length == 0 );
    if( ! PSA_KEY_TYPE_IS_KEY_PAIR( psa_get_key_type( attributes ) ) )
    {
        DRIVER_ASSERT_RETURN( pubkey == NULL );
        DRIVER_ASSERT_RETURN( pubkey_size == 0 );
    }

    status = ram_create_common( context, slot_number, attributes,
                                required_storage );
    return( status );
}

static psa_status_t ram_import( psa_drv_se_context_t *context,
                                psa_key_slot_number_t slot_number,
                                const psa_key_attributes_t *attributes,
                                const uint8_t *data,
                                size_t data_length,
                                size_t *bits )
{
    psa_key_type_t type = psa_get_key_type( attributes );
    psa_status_t status = ram_create_common( context, slot_number, attributes,
                                             data_length );
    if( status != PSA_SUCCESS )
        return( status );

    /* The RAM driver only works for certain key types: raw keys,
     * and ECC key pairs. This is true in particular of the bit-size
     * calculation here. */
    if( PSA_KEY_TYPE_IS_UNSTRUCTURED( type ) )
        *bits = PSA_BYTES_TO_BITS( data_length );
    else if ( PSA_KEY_TYPE_IS_ECC_KEY_PAIR( type ) )
    {
        *bits = ecc_curve_bits( PSA_KEY_TYPE_ECC_GET_FAMILY( type ), data_length );
        if( *bits == 0 )
            return( PSA_ERROR_DETECTED_BY_DRIVER );
    }
    else
    {
        memset( &ram_slots[slot_number], 0, sizeof( ram_slots[slot_number] ) );
        return( PSA_ERROR_NOT_SUPPORTED );
    }

    ram_slots[slot_number].bits = *bits;
    memcpy( ram_slots[slot_number].content, data, data_length );

    return( PSA_SUCCESS );
}

static psa_status_t ram_export( psa_drv_se_context_t *context,
                                psa_key_slot_number_t slot_number,
                                uint8_t *data,
                                size_t data_size,
                                size_t *data_length )
{
    size_t actual_size;
    (void) context;
    DRIVER_ASSERT_RETURN( slot_number < ARRAY_LENGTH( ram_slots ) );
    actual_size = PSA_BITS_TO_BYTES( ram_slots[slot_number].bits );
    if( actual_size > data_size )
        return( PSA_ERROR_BUFFER_TOO_SMALL );
    *data_length = actual_size;
    memcpy( data, ram_slots[slot_number].content, actual_size );
    return( PSA_SUCCESS );
}

static psa_status_t ram_export_public( psa_drv_se_context_t *context,
                                       psa_key_slot_number_t slot_number,
                                       uint8_t *data,
                                       size_t data_size,
                                       size_t *data_length )
{
    psa_status_t status;
    mbedtls_svc_key_id_t key = MBEDTLS_SVC_KEY_ID_INIT;
    psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;

    (void) context;
    DRIVER_ASSERT_RETURN( slot_number < ARRAY_LENGTH( ram_slots ) );
    DRIVER_ASSERT_RETURN(
        PSA_KEY_TYPE_IS_KEY_PAIR( ram_slots[slot_number].type ) );

    psa_set_key_type( &attributes, ram_slots[slot_number].type );
    status = psa_import_key( &attributes,
                             ram_slots[slot_number].content,
                             PSA_BITS_TO_BYTES( ram_slots[slot_number].bits ),
                             &key );
    if( status != PSA_SUCCESS )
        return( status );
    status = psa_export_public_key( key, data, data_size, data_length );
    psa_destroy_key( key );
    return( PSA_SUCCESS );
}

static psa_status_t ram_destroy( psa_drv_se_context_t *context,
                                 void *persistent_data,
                                 psa_key_slot_number_t slot_number )
{
    ram_slot_usage_t *slot_usage = persistent_data;
    DRIVER_ASSERT_RETURN( context->persistent_data_size == sizeof( ram_slot_usage_t ) );
    DRIVER_ASSERT_RETURN( slot_number < ARRAY_LENGTH( ram_slots ) );
    memset( &ram_slots[slot_number], 0, sizeof( ram_slots[slot_number] ) );
    *slot_usage &= ~(ram_slot_usage_t)( 1 << slot_number );
    ram_shadow_slot_usage = *slot_usage;
    return( PSA_SUCCESS );
}

static psa_status_t ram_allocate( psa_drv_se_context_t *context,
                                  void *persistent_data,
                                  const psa_key_attributes_t *attributes,
                                  psa_key_creation_method_t method,
                                  psa_key_slot_number_t *slot_number )
{
    ram_slot_usage_t *slot_usage = persistent_data;
    (void) attributes;
    (void) method;
    DRIVER_ASSERT_RETURN( context->persistent_data_size == sizeof( ram_slot_usage_t ) );
    for( *slot_number = ram_min_slot;
         *slot_number < ARRAY_LENGTH( ram_slots );
         ++( *slot_number ) )
    {
        if( ! ( *slot_usage & 1 << *slot_number ) )
        {
            ram_shadow_slot_usage = *slot_usage;
            return( PSA_SUCCESS );
        }
    }
    return( PSA_ERROR_INSUFFICIENT_STORAGE );
}

static psa_status_t ram_validate_slot_number(
    psa_drv_se_context_t *context,
    void *persistent_data,
    const psa_key_attributes_t *attributes,
    psa_key_creation_method_t method,
    psa_key_slot_number_t slot_number )
{
    (void) context;
    (void) persistent_data;
    (void) attributes;
    (void) method;
    if( slot_number >= ARRAY_LENGTH( ram_slots ) )
        return( PSA_ERROR_INVALID_ARGUMENT );
    return( PSA_SUCCESS );
}

static psa_status_t ram_sign( psa_drv_se_context_t *context,
                              psa_key_slot_number_t slot_number,
                              psa_algorithm_t alg,
                              const uint8_t *hash,
                              size_t hash_length,
                              uint8_t *signature,
                              size_t signature_size,
                              size_t *signature_length )
{
    ram_slot_t *slot;
    psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
    mbedtls_svc_key_id_t key = MBEDTLS_SVC_KEY_ID_INIT;
    psa_status_t status = PSA_ERROR_GENERIC_ERROR;

    (void) context;
    DRIVER_ASSERT_RETURN( slot_number < ARRAY_LENGTH( ram_slots ) );
    slot = &ram_slots[slot_number];

    psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_SIGN_HASH );
    psa_set_key_algorithm( &attributes, alg );
    psa_set_key_type( &attributes, slot->type );
    DRIVER_ASSERT( psa_import_key( &attributes,
                                   slot->content,
                                   PSA_BITS_TO_BYTES( slot->bits ),
                                   &key ) == PSA_SUCCESS );
    status = psa_sign_hash( key, alg,
                            hash, hash_length,
                            signature, signature_size, signature_length );

exit:
    psa_destroy_key( key );
    return( status );
}

static psa_status_t ram_verify( psa_drv_se_context_t *context,
                                psa_key_slot_number_t slot_number,
                                psa_algorithm_t alg,
                                const uint8_t *hash,
                                size_t hash_length,
                                const uint8_t *signature,
                                size_t signature_length )
{
    ram_slot_t *slot;
    psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
    mbedtls_svc_key_id_t key = MBEDTLS_SVC_KEY_ID_INIT;
    psa_status_t status = PSA_ERROR_GENERIC_ERROR;

    (void) context;
    DRIVER_ASSERT_RETURN( slot_number < ARRAY_LENGTH( ram_slots ) );
    slot = &ram_slots[slot_number];

    psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_VERIFY_HASH );
    psa_set_key_algorithm( &attributes, alg );
    psa_set_key_type( &attributes, slot->type );
    DRIVER_ASSERT( psa_import_key( &attributes,
                                   slot->content,
                                   PSA_BITS_TO_BYTES( slot->bits ),
                                   &key ) ==
                   PSA_SUCCESS );
    status = psa_verify_hash( key, alg,
                              hash, hash_length,
                              signature, signature_length );

exit:
    psa_destroy_key( key );
    return( status );
}


/****************************************************************/
/* Other test helper functions */
/****************************************************************/

typedef enum
{
    SIGN_IN_SOFTWARE_AND_PARALLEL_CREATION,
    SIGN_IN_DRIVER_AND_PARALLEL_CREATION,
    SIGN_IN_DRIVER_THEN_EXPORT_PUBLIC,
} sign_verify_method_t;

/* Check that the attributes of a key reported by psa_get_key_attributes()
 * are consistent with the attributes used when creating the key. */
static int check_key_attributes(
    mbedtls_svc_key_id_t key,
    const psa_key_attributes_t *reference_attributes )
{
    int ok = 0;
    psa_key_attributes_t actual_attributes = PSA_KEY_ATTRIBUTES_INIT;

    PSA_ASSERT( psa_get_key_attributes( key, &actual_attributes ) );

    TEST_ASSERT( mbedtls_svc_key_id_equal(
                     psa_get_key_id( &actual_attributes ),
                     psa_get_key_id( reference_attributes ) ) );
    TEST_EQUAL( psa_get_key_lifetime( &actual_attributes ),
                psa_get_key_lifetime( reference_attributes ) );
    TEST_EQUAL( psa_get_key_type( &actual_attributes ),
                psa_get_key_type( reference_attributes ) );
    TEST_EQUAL( psa_get_key_usage_flags( &actual_attributes ),
                psa_get_key_usage_flags( reference_attributes ) );
    TEST_EQUAL( psa_get_key_algorithm( &actual_attributes ),
                psa_get_key_algorithm( reference_attributes ) );
    TEST_EQUAL( psa_get_key_enrollment_algorithm( &actual_attributes ),
                psa_get_key_enrollment_algorithm( reference_attributes ) );
    if( psa_get_key_bits( reference_attributes ) != 0 )
    {
        TEST_EQUAL( psa_get_key_bits( &actual_attributes ),
                    psa_get_key_bits( reference_attributes ) );
    }

    {
        psa_key_slot_number_t actual_slot_number = 0xdeadbeef;
        psa_key_slot_number_t desired_slot_number = 0xb90cc011;
        psa_key_lifetime_t lifetime =
            psa_get_key_lifetime( &actual_attributes );
        psa_status_t status = psa_get_key_slot_number( &actual_attributes,
                                                       &actual_slot_number );
        if( PSA_KEY_LIFETIME_GET_LOCATION( lifetime ) < MIN_DRIVER_LOCATION )
        {
            /* The key is not in a secure element. */
            TEST_EQUAL( status, PSA_ERROR_INVALID_ARGUMENT );
        }
        else
        {
            /* The key is in a secure element. If it had been created
             * in a specific slot, check that it is reported there. */
            PSA_ASSERT( status );
            status = psa_get_key_slot_number( reference_attributes,
                                              &desired_slot_number );
            if( status == PSA_SUCCESS )
            {
                TEST_EQUAL( desired_slot_number, actual_slot_number );
            }
        }
    }
    ok = 1;

exit:
    return( ok );
}

/* Get the file UID corresponding to the specified location.
 * If this changes, the storage format version must change.
 * See psa_get_se_driver_its_file_uid() in psa_crypto_se.c.
 */
psa_storage_uid_t file_uid_for_location( psa_key_location_t location )
{
    if( location > PSA_MAX_SE_LOCATION )
        return( 0 );
    return( 0xfffffe00 + location );
}

/* Check that the persistent data of a driver has its expected content. */
static int check_persistent_data( psa_key_location_t location,
                                  const void *expected_data,
                                  size_t size )
{
    psa_storage_uid_t uid = file_uid_for_location( location );
    struct psa_storage_info_t info;
    uint8_t *loaded = NULL;
    int ok = 0;

    PSA_ASSERT( psa_its_get_info( uid, &info ) );
    ASSERT_ALLOC( loaded, info.size );
    PSA_ASSERT( psa_its_get( uid, 0, info.size, loaded, NULL ) );
    ASSERT_COMPARE( expected_data, size, loaded, info.size );
    ok = 1;

exit:
    mbedtls_free( loaded );
    return( ok );
}

/* Check that no persistent data exists for the given location. */
static int check_no_persistent_data( psa_key_location_t location )
{
    psa_storage_uid_t uid = file_uid_for_location( location );
    struct psa_storage_info_t info;
    int ok = 0;

    TEST_EQUAL( psa_its_get_info( uid, &info ), PSA_ERROR_DOES_NOT_EXIST );
    ok = 1;

exit:
    return( ok );
}

/* Check that a function's return status is "smoke-free", i.e. that
 * it's an acceptable error code when calling an API function that operates
 * on a key with potentially bogus parameters. */
static int is_status_smoke_free( psa_status_t status )
{
    switch( status )
    {
        case PSA_SUCCESS:
        case PSA_ERROR_NOT_SUPPORTED:
        case PSA_ERROR_NOT_PERMITTED:
        case PSA_ERROR_BUFFER_TOO_SMALL:
        case PSA_ERROR_INVALID_ARGUMENT:
        case PSA_ERROR_INVALID_SIGNATURE:
        case PSA_ERROR_INVALID_PADDING:
            return( 1 );
        default:
            return( 0 );
    }
}
#define SMOKE_ASSERT( expr )                    \
    TEST_ASSERT( is_status_smoke_free( expr ) )

/* Smoke test a key. There are mostly no wrong answers here since we pass
 * mostly bogus parameters: the goal is to ensure that there is no memory
 * corruption or crash. This test function is most useful when run under
 * an environment with sanity checks such as ASan or MSan. */
static int smoke_test_key( mbedtls_svc_key_id_t key )
{
    int ok = 0;
    psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
    psa_mac_operation_t mac_operation = PSA_MAC_OPERATION_INIT;
    psa_cipher_operation_t cipher_operation = PSA_CIPHER_OPERATION_INIT;
    psa_key_derivation_operation_t derivation_operation =
        PSA_KEY_DERIVATION_OPERATION_INIT;
    uint8_t buffer[80]; /* large enough for a public key for ECDH */
    size_t length;
    mbedtls_svc_key_id_t key2 = MBEDTLS_SVC_KEY_ID_INIT;

    SMOKE_ASSERT( psa_get_key_attributes( key, &attributes ) );

    SMOKE_ASSERT( psa_export_key( key,
                                  buffer, sizeof( buffer ), &length ) );
    SMOKE_ASSERT( psa_export_public_key( key,
                                         buffer, sizeof( buffer ), &length ) );

    SMOKE_ASSERT( psa_copy_key( key, &attributes, &key2 ) );
    if( ! mbedtls_svc_key_id_is_null( key2 ) )
        PSA_ASSERT( psa_destroy_key( key2 ) );

    SMOKE_ASSERT( psa_mac_sign_setup( &mac_operation, key, PSA_ALG_CMAC ) );
    PSA_ASSERT( psa_mac_abort( &mac_operation ) );
    SMOKE_ASSERT( psa_mac_verify_setup( &mac_operation, key,
                                        PSA_ALG_HMAC( PSA_ALG_SHA_256 ) ) );
    PSA_ASSERT( psa_mac_abort( &mac_operation ) );

    SMOKE_ASSERT( psa_cipher_encrypt_setup( &cipher_operation, key,
                                            PSA_ALG_CTR ) );
    PSA_ASSERT( psa_cipher_abort( &cipher_operation ) );
    SMOKE_ASSERT( psa_cipher_decrypt_setup( &cipher_operation, key,
                                            PSA_ALG_CTR ) );
    PSA_ASSERT( psa_cipher_abort( &cipher_operation ) );

    SMOKE_ASSERT( psa_aead_encrypt( key, PSA_ALG_CCM,
                                    buffer, sizeof( buffer ),
                                    NULL, 0,
                                    buffer, sizeof( buffer),
                                    buffer, sizeof( buffer), &length ) );
    SMOKE_ASSERT( psa_aead_decrypt( key, PSA_ALG_CCM,
                                    buffer, sizeof( buffer ),
                                    NULL, 0,
                                    buffer, sizeof( buffer),
                                    buffer, sizeof( buffer), &length ) );

    SMOKE_ASSERT( psa_sign_hash( key, PSA_ALG_ECDSA_ANY,
                                 buffer, 32,
                                 buffer, sizeof( buffer ), &length ) );
    SMOKE_ASSERT( psa_verify_hash( key, PSA_ALG_ECDSA_ANY,
                                   buffer, 32,
                                   buffer, sizeof( buffer ) ) );

    SMOKE_ASSERT( psa_asymmetric_encrypt( key, PSA_ALG_RSA_PKCS1V15_CRYPT,
                                          buffer, 10, NULL, 0,
                                          buffer, sizeof( buffer ), &length ) );
    SMOKE_ASSERT( psa_asymmetric_decrypt( key, PSA_ALG_RSA_PKCS1V15_CRYPT,
                                          buffer, sizeof( buffer ), NULL, 0,
                                          buffer, sizeof( buffer ), &length ) );

#if defined(MBEDTLS_SHA256_C)
    /* Try the key in a plain key derivation. */
    PSA_ASSERT( psa_key_derivation_setup( &derivation_operation,
                                          PSA_ALG_HKDF( PSA_ALG_SHA_256 ) ) );
    PSA_ASSERT( psa_key_derivation_input_bytes( &derivation_operation,
                                                PSA_KEY_DERIVATION_INPUT_SALT,
                                                NULL, 0 ) );
    SMOKE_ASSERT( psa_key_derivation_input_key( &derivation_operation,
                                                PSA_KEY_DERIVATION_INPUT_SECRET,
                                                key ) );
    PSA_ASSERT( psa_key_derivation_abort( &derivation_operation ) );

    /* If the key is asymmetric, try it in a key agreement, both as
     * part of a derivation operation and standalone. */
    if( psa_export_public_key( key, buffer, sizeof( buffer ), &length ) ==
        PSA_SUCCESS )
    {
        psa_algorithm_t alg =
            PSA_ALG_KEY_AGREEMENT( PSA_ALG_ECDH,
                                   PSA_ALG_HKDF( PSA_ALG_SHA_256 ) );
        PSA_ASSERT( psa_key_derivation_setup( &derivation_operation, alg ) );
        PSA_ASSERT( psa_key_derivation_input_bytes(
                        &derivation_operation, PSA_KEY_DERIVATION_INPUT_SALT,
                        NULL, 0 ) );
        SMOKE_ASSERT( psa_key_derivation_key_agreement(
                          &derivation_operation,
                          PSA_KEY_DERIVATION_INPUT_SECRET,
                          key, buffer, length ) );
        PSA_ASSERT( psa_key_derivation_abort( &derivation_operation ) );

        SMOKE_ASSERT( psa_raw_key_agreement(
                          alg, key, buffer, length,
                          buffer, sizeof( buffer ), &length ) );
    }
#endif /* MBEDTLS_SHA256_C */

    ok = 1;

exit:
    psa_reset_key_attributes( &attributes );
    return( ok );
}

static mbedtls_svc_key_id_t key_ids_used_in_test[10];
static size_t num_key_ids_used;

/* Record a key id as potentially used in a test case. */
static int test_uses_key_id( mbedtls_svc_key_id_t key_id )
{
    size_t i;

    for( i = 0; i < num_key_ids_used ; i++ )
    {
        if( mbedtls_svc_key_id_equal( key_id, key_ids_used_in_test[i] ) )
            return( 1 );
    }

    if( num_key_ids_used >= ARRAY_LENGTH( key_ids_used_in_test ) )
        return( 0 );

    key_ids_used_in_test[num_key_ids_used] = key_id;
    ++num_key_ids_used;

    return( 1 );
}

#define TEST_USES_KEY_ID( key_id )                       \
    TEST_ASSERT( test_uses_key_id( key_id ) )

static void psa_purge_storage( void )
{
    size_t i;
    psa_key_location_t location;

    for( i = 0; i < num_key_ids_used; i++ )
        psa_destroy_persistent_key( key_ids_used_in_test[i] );
    num_key_ids_used = 0;

    /* Purge the transaction file. */
    psa_crypto_stop_transaction( );
    /* Purge driver persistent data. */
    for( location = 0; location < PSA_MAX_SE_LOCATION; location++ )
        psa_destroy_se_persistent_data( location );
}

/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_PSA_CRYPTO_SE_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE */
void register_one( int location, int version, int expected_status_arg )
{
    psa_status_t expected_status = expected_status_arg;
    psa_drv_se_t driver;

    memset( &driver, 0, sizeof( driver ) );
    driver.hal_version = version;

    TEST_EQUAL( psa_register_se_driver( location, &driver ),
                expected_status );

    PSA_ASSERT( psa_crypto_init( ) );

exit:
    PSA_DONE( );
}
/* END_CASE */

/* BEGIN_CASE */
void register_twice( int count )
{
    psa_drv_se_t driver;
    psa_key_location_t location;
    psa_key_location_t max = MIN_DRIVER_LOCATION + count;

    memset( &driver, 0, sizeof( driver ) );
    driver.hal_version = PSA_DRV_SE_HAL_VERSION;

    for( location = MIN_DRIVER_LOCATION; location < max; location++ )
        PSA_ASSERT( psa_register_se_driver( location, &driver ) );
    for( location = MIN_DRIVER_LOCATION; location < max; location++ )
        TEST_EQUAL( psa_register_se_driver( location, &driver ),
                    PSA_ERROR_ALREADY_EXISTS );

    PSA_ASSERT( psa_crypto_init( ) );

exit:
    PSA_DONE( );
}
/* END_CASE */

/* BEGIN_CASE */
void register_max( )
{
    psa_drv_se_t driver;
    psa_key_location_t location;
    psa_key_location_t max = MIN_DRIVER_LOCATION + PSA_MAX_SE_DRIVERS;

    memset( &driver, 0, sizeof( driver ) );
    driver.hal_version = PSA_DRV_SE_HAL_VERSION;

    for( location = MIN_DRIVER_LOCATION; location < max; location++ )
        PSA_ASSERT( psa_register_se_driver( location, &driver ) );

    TEST_EQUAL( psa_register_se_driver( location, &driver ),
                PSA_ERROR_INSUFFICIENT_MEMORY );

    PSA_ASSERT( psa_crypto_init( ) );

exit:
    PSA_DONE( );
}
/* END_CASE */

/* BEGIN_CASE */
void key_creation_import_export( int lifetime_arg, int min_slot, int restart )
{
    psa_drv_se_t driver;
    psa_drv_se_key_management_t key_management;
    psa_key_lifetime_t lifetime = (psa_key_lifetime_t) lifetime_arg;
    psa_key_location_t location = PSA_KEY_LIFETIME_GET_LOCATION( lifetime );
    mbedtls_svc_key_id_t id = mbedtls_svc_key_id_make( 1, 1 );
    mbedtls_svc_key_id_t returned_id = MBEDTLS_SVC_KEY_ID_INIT;
    psa_key_handle_t handle;
    psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
    const uint8_t key_material[3] = {0xfa, 0xca, 0xde};
    uint8_t exported[sizeof( key_material )];
    size_t exported_length;

    TEST_USES_KEY_ID( id );

    memset( &driver, 0, sizeof( driver ) );
    memset( &key_management, 0, sizeof( key_management ) );
    driver.hal_version = PSA_DRV_SE_HAL_VERSION;
    driver.key_management = &key_management;
    driver.persistent_data_size = sizeof( ram_slot_usage_t );
    key_management.p_allocate = ram_allocate;
    key_management.p_import = ram_import;
    key_management.p_destroy = ram_destroy;
    key_management.p_export = ram_export;
    ram_min_slot = min_slot;

    PSA_ASSERT( psa_register_se_driver( location, &driver ) );
    PSA_ASSERT( psa_crypto_init( ) );

    /* Create a key. */
    psa_set_key_id( &attributes, id );
    psa_set_key_lifetime( &attributes, lifetime );
    psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_EXPORT );
    psa_set_key_type( &attributes, PSA_KEY_TYPE_RAW_DATA );
    PSA_ASSERT( psa_import_key( &attributes,
                                key_material, sizeof( key_material ),
                                &returned_id ) );

    if( PSA_KEY_LIFETIME_IS_VOLATILE( lifetime ) )
    {
        /* For volatile keys, check no persistent data was created */
        if( ! check_no_persistent_data( location ) )
            goto exit;
    }
    else
    {
        /* For persistent keys, check persistent data */
        if( ! check_persistent_data( location,
                             &ram_shadow_slot_usage,
                             sizeof( ram_shadow_slot_usage ) ) )
            goto exit;
    }

    /* Test that the key was created in the expected slot. */
    TEST_EQUAL( ram_slots[min_slot].type, PSA_KEY_TYPE_RAW_DATA );

    /* Maybe restart, to check that the information is saved correctly. */
    if( restart )
    {
        mbedtls_psa_crypto_free( );
        PSA_ASSERT( psa_register_se_driver( location, &driver ) );
        PSA_ASSERT( psa_crypto_init( ) );

        if( PSA_KEY_LIFETIME_IS_VOLATILE( lifetime ) )
        {
            /* Check that the PSA core has no knowledge of the volatile key */
            TEST_ASSERT( psa_open_key( returned_id, &handle ) ==
                         PSA_ERROR_DOES_NOT_EXIST );

            /* Drop data from our mockup driver */
            ram_slots_reset();
            ram_min_slot = min_slot;

            /* Re-import key */
            PSA_ASSERT( psa_import_key( &attributes,
                                        key_material, sizeof( key_material ),
                                        &returned_id ) );
        }
        else
        {
            /* Check the persistent key file */
            if( ! check_persistent_data( location,
                                         &ram_shadow_slot_usage,
                                         sizeof( ram_shadow_slot_usage ) ) )
                goto exit;
        }
    }

    /* Test that the key was created in the expected slot. */
    TEST_EQUAL( ram_slots[min_slot].type, PSA_KEY_TYPE_RAW_DATA );

    /* Test the key attributes, including the reported slot number. */
    psa_set_key_bits( &attributes,
                      PSA_BYTES_TO_BITS( sizeof( key_material ) ) );
    psa_set_key_slot_number( &attributes, min_slot );

    if( PSA_KEY_LIFETIME_IS_VOLATILE( lifetime ) )
        attributes.core.id = returned_id;
    else
        psa_set_key_id( &attributes, returned_id );

    if( ! check_key_attributes( returned_id, &attributes ) )
        goto exit;

    /* Test the key data. */
    PSA_ASSERT( psa_export_key( returned_id,
                                exported, sizeof( exported ),
                                &exported_length ) );
    ASSERT_COMPARE( key_material, sizeof( key_material ),
                    exported, exported_length );

    PSA_ASSERT( psa_destroy_key( returned_id ) );
    if( ! check_persistent_data( location,
                                 &ram_shadow_slot_usage,
                                 sizeof( ram_shadow_slot_usage ) ) )
        goto exit;
    TEST_EQUAL( psa_open_key( returned_id, &handle ),
                PSA_ERROR_DOES_NOT_EXIST );

    /* Test that the key has been erased from the designated slot. */
    TEST_EQUAL( ram_slots[min_slot].type, 0 );

exit:
    PSA_DONE( );
    ram_slots_reset( );
    psa_purge_storage( );
}
/* END_CASE */

/* BEGIN_CASE */
void key_creation_in_chosen_slot( int slot_arg,
                                  int restart,
                                  int expected_status_arg )
{
    psa_key_slot_number_t wanted_slot = slot_arg;
    psa_status_t expected_status = expected_status_arg;
    psa_status_t status;
    psa_drv_se_t driver;
    psa_drv_se_key_management_t key_management;
    psa_key_lifetime_t lifetime = TEST_SE_PERSISTENT_LIFETIME;
    psa_key_location_t location = PSA_KEY_LIFETIME_GET_LOCATION( lifetime );
    mbedtls_svc_key_id_t id = mbedtls_svc_key_id_make( 1, 1 );
    mbedtls_svc_key_id_t returned_id;
    psa_key_handle_t handle;
    psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
    const uint8_t key_material[3] = {0xfa, 0xca, 0xde};

    TEST_USES_KEY_ID( id );

    memset( &driver, 0, sizeof( driver ) );
    memset( &key_management, 0, sizeof( key_management ) );
    driver.hal_version = PSA_DRV_SE_HAL_VERSION;
    driver.key_management = &key_management;
    driver.persistent_data_size = sizeof( ram_slot_usage_t );
    key_management.p_validate_slot_number = ram_validate_slot_number;
    key_management.p_import = ram_import;
    key_management.p_destroy = ram_destroy;
    key_management.p_export = ram_export;

    PSA_ASSERT( psa_register_se_driver( location, &driver ) );
    PSA_ASSERT( psa_crypto_init( ) );

    /* Create a key. */
    psa_set_key_id( &attributes, id );
    psa_set_key_lifetime( &attributes, lifetime );
    psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_EXPORT );
    psa_set_key_type( &attributes, PSA_KEY_TYPE_RAW_DATA );
    psa_set_key_slot_number( &attributes, wanted_slot );
    status = psa_import_key( &attributes,
                             key_material, sizeof( key_material ),
                             &returned_id );
    TEST_EQUAL( status, expected_status );

    if( status != PSA_SUCCESS )
        goto exit;
    if( ! check_persistent_data( location,
                                 &ram_shadow_slot_usage,
                                 sizeof( ram_shadow_slot_usage ) ) )
        goto exit;

    /* Maybe restart, to check that the information is saved correctly. */
    if( restart )
    {
        mbedtls_psa_crypto_free( );
        PSA_ASSERT( psa_register_se_driver( location, &driver ) );
        PSA_ASSERT( psa_crypto_init( ) );
        if( ! check_persistent_data( location,
                                     &ram_shadow_slot_usage,
                                     sizeof( ram_shadow_slot_usage ) ) )
            goto exit;
    }

    /* Test that the key was created in the expected slot. */
    TEST_EQUAL( ram_slots[wanted_slot].type, PSA_KEY_TYPE_RAW_DATA );

    /* Test that the key is reported with the correct attributes,
     * including the expected slot. */
    PSA_ASSERT( psa_get_key_attributes( id, &attributes ) );

    PSA_ASSERT( psa_destroy_key( id ) );
    if( ! check_persistent_data( location,
                                 &ram_shadow_slot_usage,
                                 sizeof( ram_shadow_slot_usage ) ) )
        goto exit;
    TEST_EQUAL( psa_open_key( id, &handle ), PSA_ERROR_DOES_NOT_EXIST );

exit:
    PSA_DONE( );
    ram_slots_reset( );
    psa_purge_storage( );
}
/* END_CASE */

/* BEGIN_CASE */
void import_key_smoke( int type_arg, int alg_arg,
                       data_t *key_material )
{
    psa_key_type_t type = type_arg;
    psa_algorithm_t alg = alg_arg;
    psa_drv_se_t driver;
    psa_drv_se_key_management_t key_management;
    psa_key_lifetime_t lifetime = TEST_SE_PERSISTENT_LIFETIME;
    psa_key_location_t location = PSA_KEY_LIFETIME_GET_LOCATION( lifetime );
    mbedtls_svc_key_id_t id = mbedtls_svc_key_id_make( 1, 1 );
    mbedtls_svc_key_id_t returned_id;
    psa_key_handle_t handle;
    psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;

    TEST_USES_KEY_ID( id );

    memset( &driver, 0, sizeof( driver ) );
    memset( &key_management, 0, sizeof( key_management ) );
    driver.hal_version = PSA_DRV_SE_HAL_VERSION;
    driver.key_management = &key_management;
    driver.persistent_data_size = sizeof( psa_key_slot_number_t );
    key_management.p_allocate = counter_allocate;
    key_management.p_import = null_import;
    key_management.p_destroy = null_destroy;

    PSA_ASSERT( psa_register_se_driver( location, &driver ) );
    PSA_ASSERT( psa_crypto_init( ) );

    /* Create a key. */
    psa_set_key_id( &attributes, id );
    psa_set_key_lifetime( &attributes, lifetime );
    psa_set_key_usage_flags( &attributes,
                             PSA_KEY_USAGE_SIGN_HASH | PSA_KEY_USAGE_VERIFY_HASH |
                             PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT |
                             PSA_KEY_USAGE_EXPORT );
    psa_set_key_algorithm( &attributes, alg );
    psa_set_key_type( &attributes, type );
    PSA_ASSERT( psa_import_key( &attributes,
                                key_material->x, key_material->len,
                                &returned_id ) );
    if( ! check_persistent_data( location,
                                 &shadow_counter, sizeof( shadow_counter ) ) )
        goto exit;

    /* Do stuff with the key. */
    if( ! smoke_test_key( id ) )
        goto exit;

    /* Restart and try again. */
    mbedtls_psa_crypto_free( );
    PSA_ASSERT( psa_register_se_driver( location, &driver ) );
    PSA_ASSERT( psa_crypto_init( ) );
    if( ! check_persistent_data( location,
                                 &shadow_counter, sizeof( shadow_counter ) ) )
        goto exit;
    if( ! smoke_test_key( id ) )
        goto exit;

    /* We're done. */
    PSA_ASSERT( psa_destroy_key( id ) );
    if( ! check_persistent_data( location,
                                 &shadow_counter, sizeof( shadow_counter ) ) )
        goto exit;
    TEST_EQUAL( psa_open_key( id, &handle ), PSA_ERROR_DOES_NOT_EXIST );

exit:
    PSA_DONE( );
    counter_reset( );
    psa_purge_storage( );
}
/* END_CASE */

/* BEGIN_CASE */
void generate_key_not_supported( int type_arg, int bits_arg )
{
    psa_key_type_t type = type_arg;
    size_t bits = bits_arg;
    psa_drv_se_t driver;
    psa_drv_se_key_management_t key_management;
    psa_key_lifetime_t lifetime = TEST_SE_PERSISTENT_LIFETIME;
    psa_key_location_t location = PSA_KEY_LIFETIME_GET_LOCATION( lifetime );
    mbedtls_svc_key_id_t id = mbedtls_svc_key_id_make( 1, 1 );
    mbedtls_svc_key_id_t returned_id;
    psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;

    TEST_USES_KEY_ID( id );

    memset( &driver, 0, sizeof( driver ) );
    memset( &key_management, 0, sizeof( key_management ) );
    driver.hal_version = PSA_DRV_SE_HAL_VERSION;
    driver.key_management = &key_management;
    driver.persistent_data_size = sizeof( psa_key_slot_number_t );
    key_management.p_allocate = counter_allocate;
    /* No p_generate method */

    PSA_ASSERT( psa_register_se_driver( location, &driver ) );
    PSA_ASSERT( psa_crypto_init( ) );

    psa_set_key_id( &attributes, id );
    psa_set_key_lifetime( &attributes, lifetime );
    psa_set_key_type( &attributes, type );
    psa_set_key_bits( &attributes, bits );
    TEST_EQUAL( psa_generate_key( &attributes, &returned_id ),
                PSA_ERROR_NOT_SUPPORTED );

exit:
    PSA_DONE( );
    counter_reset( );
    psa_purge_storage( );
}
/* END_CASE */

/* BEGIN_CASE */
void generate_key_smoke( int type_arg, int bits_arg, int alg_arg )
{
    psa_key_type_t type = type_arg;
    psa_key_bits_t bits = bits_arg;
    psa_algorithm_t alg = alg_arg;
    psa_drv_se_t driver;
    psa_drv_se_key_management_t key_management;
    psa_key_lifetime_t lifetime = TEST_SE_PERSISTENT_LIFETIME;
    psa_key_location_t location = PSA_KEY_LIFETIME_GET_LOCATION( lifetime );
    mbedtls_svc_key_id_t id = mbedtls_svc_key_id_make( 1, 1 );
    mbedtls_svc_key_id_t returned_id;
    psa_key_handle_t handle;
    psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;

    TEST_USES_KEY_ID( id );

    memset( &driver, 0, sizeof( driver ) );
    memset( &key_management, 0, sizeof( key_management ) );
    driver.hal_version = PSA_DRV_SE_HAL_VERSION;
    driver.key_management = &key_management;
    driver.persistent_data_size = sizeof( psa_key_slot_number_t );
    key_management.p_allocate = counter_allocate;
    key_management.p_generate = null_generate;
    key_management.p_destroy = null_destroy;

    PSA_ASSERT( psa_register_se_driver( location, &driver ) );
    PSA_ASSERT( psa_crypto_init( ) );

    /* Create a key. */
    psa_set_key_id( &attributes, id );
    psa_set_key_lifetime( &attributes, lifetime );
    psa_set_key_usage_flags( &attributes,
                             PSA_KEY_USAGE_SIGN_HASH | PSA_KEY_USAGE_VERIFY_HASH |
                             PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT |
                             PSA_KEY_USAGE_EXPORT );
    psa_set_key_algorithm( &attributes, alg );
    psa_set_key_type( &attributes, type );
    psa_set_key_bits( &attributes, bits );
    PSA_ASSERT( psa_generate_key( &attributes, &returned_id ) );
    if( ! check_persistent_data( location,
                                 &shadow_counter, sizeof( shadow_counter ) ) )
        goto exit;

    /* Do stuff with the key. */
    if( ! smoke_test_key( id ) )
        goto exit;

    /* Restart and try again. */
    mbedtls_psa_crypto_free( );
    PSA_ASSERT( psa_register_se_driver( location, &driver ) );
    PSA_ASSERT( psa_crypto_init( ) );
    if( ! check_persistent_data( location,
                                 &shadow_counter, sizeof( shadow_counter ) ) )
        goto exit;
    if( ! smoke_test_key( id ) )
        goto exit;

    /* We're done. */
    PSA_ASSERT( psa_destroy_key( id ) );
    if( ! check_persistent_data( location,
                                 &shadow_counter, sizeof( shadow_counter ) ) )
        goto exit;
    TEST_EQUAL( psa_open_key( id, &handle ), PSA_ERROR_DOES_NOT_EXIST );

exit:
    PSA_DONE( );
    counter_reset( );
    psa_purge_storage( );
}
/* END_CASE */

/* BEGIN_CASE */
void sign_verify( int flow,
                  int type_arg, int alg_arg,
                  int bits_arg, data_t *key_material,
                  data_t *input )
{
    psa_key_type_t type = type_arg;
    psa_algorithm_t alg = alg_arg;
    size_t bits = bits_arg;
    /* Pass bits=0 to import, bits>0 to fake-generate */
    int generating = ( bits != 0 );

    psa_drv_se_t driver;
    psa_drv_se_key_management_t key_management;
    psa_drv_se_asymmetric_t asymmetric;

    psa_key_lifetime_t lifetime = TEST_SE_PERSISTENT_LIFETIME;
    psa_key_location_t location = PSA_KEY_LIFETIME_GET_LOCATION( lifetime );
    mbedtls_svc_key_id_t id = mbedtls_svc_key_id_make( 1, 1 );
    mbedtls_svc_key_id_t returned_id;
    mbedtls_svc_key_id_t sw_key = MBEDTLS_SVC_KEY_ID_INIT;
    psa_key_attributes_t sw_attributes = PSA_KEY_ATTRIBUTES_INIT;
    psa_key_attributes_t drv_attributes;
    uint8_t signature[PSA_SIGNATURE_MAX_SIZE];
    size_t signature_length;

    TEST_USES_KEY_ID( id );

    memset( &driver, 0, sizeof( driver ) );
    memset( &key_management, 0, sizeof( key_management ) );
    memset( &asymmetric, 0, sizeof( asymmetric ) );
    driver.hal_version = PSA_DRV_SE_HAL_VERSION;
    driver.key_management = &key_management;
    driver.asymmetric = &asymmetric;
    driver.persistent_data_size = sizeof( ram_slot_usage_t );
    key_management.p_allocate = ram_allocate;
    key_management.p_destroy = ram_destroy;
    if( generating )
        key_management.p_generate = ram_fake_generate;
    else
        key_management.p_import = ram_import;
    switch( flow )
    {
        case SIGN_IN_SOFTWARE_AND_PARALLEL_CREATION:
            break;
        case SIGN_IN_DRIVER_AND_PARALLEL_CREATION:
            asymmetric.p_sign = ram_sign;
            break;
        case SIGN_IN_DRIVER_THEN_EXPORT_PUBLIC:
            asymmetric.p_sign = ram_sign;
            key_management.p_export_public = ram_export_public;
            break;
        default:
            TEST_ASSERT( ! "unsupported flow (should be SIGN_IN_xxx)" );
            break;
    }
    asymmetric.p_verify = ram_verify;

    PSA_ASSERT( psa_register_se_driver( location, &driver ) );
    PSA_ASSERT( psa_crypto_init( ) );

    /* Prepare to create two keys with the same key material: a transparent
     * key, and one that goes through the driver. */
    psa_set_key_usage_flags( &sw_attributes,
                             PSA_KEY_USAGE_SIGN_HASH | PSA_KEY_USAGE_VERIFY_HASH );
    psa_set_key_algorithm( &sw_attributes, alg );
    psa_set_key_type( &sw_attributes, type );
    drv_attributes = sw_attributes;
    psa_set_key_id( &drv_attributes, id );
    psa_set_key_lifetime( &drv_attributes, lifetime );

    /* Create the key in the driver. */
    if( generating )
    {
        psa_set_key_bits( &drv_attributes, bits );
        PSA_ASSERT( psa_generate_key( &drv_attributes, &returned_id ) );
        /* Since we called a generate method that does not actually
         * generate material, store the desired result of generation in
         * the mock secure element storage. */
        PSA_ASSERT( psa_get_key_attributes( id, &drv_attributes ) );
        TEST_EQUAL( key_material->len, PSA_BITS_TO_BYTES( bits ) );
        memcpy( ram_slots[ram_min_slot].content, key_material->x,
                key_material->len );
    }
    else
    {
        PSA_ASSERT( psa_import_key( &drv_attributes,
                                    key_material->x, key_material->len,
                                    &returned_id ) );
    }

    /* Either import the same key in software, or export the driver's
     * public key and import that. */
    switch( flow )
    {
        case SIGN_IN_SOFTWARE_AND_PARALLEL_CREATION:
        case SIGN_IN_DRIVER_AND_PARALLEL_CREATION:
            PSA_ASSERT( psa_import_key( &sw_attributes,
                                        key_material->x, key_material->len,
                                        &sw_key ) );
            break;
        case SIGN_IN_DRIVER_THEN_EXPORT_PUBLIC:
        {
            uint8_t public_key[PSA_KEY_EXPORT_ECC_PUBLIC_KEY_MAX_SIZE( PSA_VENDOR_ECC_MAX_CURVE_BITS )];
            size_t public_key_length;
            PSA_ASSERT( psa_export_public_key( id,
                                               public_key, sizeof( public_key ),
                                               &public_key_length ) );
            psa_set_key_type( &sw_attributes,
                              PSA_KEY_TYPE_PUBLIC_KEY_OF_KEY_PAIR( type ) );
            PSA_ASSERT( psa_import_key( &sw_attributes,
                                        public_key, public_key_length,
                                        &sw_key ) );
            break;
        }
    }

    /* Sign with the chosen key. */
    switch( flow )
    {
        case SIGN_IN_DRIVER_AND_PARALLEL_CREATION:
        case SIGN_IN_DRIVER_THEN_EXPORT_PUBLIC:
            PSA_ASSERT_VIA_DRIVER(
                psa_sign_hash( id, alg,
                               input->x, input->len,
                               signature, sizeof( signature ),
                               &signature_length ),
                PSA_SUCCESS );
            break;
        case SIGN_IN_SOFTWARE_AND_PARALLEL_CREATION:
            PSA_ASSERT( psa_sign_hash( sw_key, alg,
                                       input->x, input->len,
                                       signature, sizeof( signature ),
                                       &signature_length ) );
            break;
    }

    /* Verify with both keys. */
    PSA_ASSERT( psa_verify_hash( sw_key, alg,
                                 input->x, input->len,
                                 signature, signature_length ) );
    PSA_ASSERT_VIA_DRIVER(
        psa_verify_hash( id, alg,
                         input->x, input->len,
                         signature, signature_length ),
        PSA_SUCCESS );

    /* Change the signature and verify again. */
    signature[0] ^= 1;
    TEST_EQUAL( psa_verify_hash( sw_key, alg,
                                 input->x, input->len,
                                 signature, signature_length ),
                PSA_ERROR_INVALID_SIGNATURE );
    PSA_ASSERT_VIA_DRIVER(
        psa_verify_hash( id, alg,
                         input->x, input->len,
                         signature, signature_length ),
        PSA_ERROR_INVALID_SIGNATURE );

exit:
    psa_destroy_key( id );
    psa_destroy_key( sw_key );
    PSA_DONE( );
    ram_slots_reset( );
    psa_purge_storage( );
}
/* END_CASE */

/* BEGIN_CASE */
void register_key_smoke_test( int lifetime_arg,
                              int owner_id_arg,
                              int id_arg,
                              int validate,
                              int expected_status_arg )
{
    psa_key_lifetime_t lifetime = lifetime_arg;
    psa_key_location_t location = PSA_KEY_LIFETIME_GET_LOCATION( lifetime );
    psa_status_t expected_status = expected_status_arg;
    psa_drv_se_t driver;
    psa_drv_se_key_management_t key_management;
    psa_key_attributes_t attributes = PSA_KEY_ATTRIBUTES_INIT;
    mbedtls_svc_key_id_t id = mbedtls_svc_key_id_make( owner_id_arg, id_arg );
    psa_key_handle_t handle;
    size_t bit_size = 48;
    psa_key_slot_number_t wanted_slot = 0x123456789;
    psa_status_t status;

    TEST_USES_KEY_ID( id );

    memset( &driver, 0, sizeof( driver ) );
    driver.hal_version = PSA_DRV_SE_HAL_VERSION;
    memset( &key_management, 0, sizeof( key_management ) );
    driver.key_management = &key_management;
    key_management.p_destroy = null_destroy;
    if( validate >= 0 )
    {
        key_management.p_validate_slot_number = validate_slot_number_as_directed;
        validate_slot_number_directions.slot_number = wanted_slot;
        validate_slot_number_directions.method = PSA_KEY_CREATION_REGISTER;
        validate_slot_number_directions.status =
            ( validate > 0 ? PSA_SUCCESS : PSA_ERROR_NOT_PERMITTED );
    }

    PSA_ASSERT( psa_register_se_driver( MIN_DRIVER_LOCATION, &driver ) );
    PSA_ASSERT( psa_crypto_init( ) );

    psa_set_key_id( &attributes, id );
    psa_set_key_lifetime( &attributes, lifetime );
    psa_set_key_usage_flags( &attributes, PSA_KEY_USAGE_EXPORT );
    psa_set_key_type( &attributes, PSA_KEY_TYPE_RAW_DATA );
    psa_set_key_bits( &attributes, bit_size );
    psa_set_key_slot_number( &attributes, wanted_slot );

    status = mbedtls_psa_register_se_key( &attributes );
    TEST_EQUAL( status, expected_status );

    if( status != PSA_SUCCESS )
        goto exit;

    /* Test that the key exists and has the expected attributes. */
    if( ! check_key_attributes( id, &attributes ) )
        goto exit;

#if defined(MBEDTLS_PSA_CRYPTO_KEY_ID_ENCODES_OWNER)
    mbedtls_svc_key_id_t invalid_id =
        mbedtls_svc_key_id_make( owner_id_arg + 1, id_arg );
    TEST_EQUAL( psa_open_key( invalid_id, &handle ), PSA_ERROR_DOES_NOT_EXIST );
#endif

    PSA_ASSERT( psa_purge_key( id ) );

    /* Restart and try again. */
    PSA_DONE( );
    PSA_ASSERT( psa_register_se_driver( location, &driver ) );
    PSA_ASSERT( psa_crypto_init( ) );
    if( ! check_key_attributes( id, &attributes ) )
        goto exit;
    /* This time, destroy the key. */
    PSA_ASSERT( psa_destroy_key( id ) );
    TEST_EQUAL( psa_open_key( id, &handle ), PSA_ERROR_DOES_NOT_EXIST );

exit:
    psa_reset_key_attributes( &attributes );
    psa_destroy_key( id );
    PSA_DONE( );
    psa_purge_storage( );
    memset( &validate_slot_number_directions, 0,
            sizeof( validate_slot_number_directions ) );
}
/* END_CASE */