tests/suites/test_suite_psa_crypto.function

/* BEGIN_HEADER */
#include <stdint.h>

#if defined(MBEDTLS_PSA_CRYPTO_SPM)
#include "spm/psa_defs.h"
#endif

#include "mbedtls/asn1write.h"
#include "psa/crypto.h"

#if(UINT32_MAX > SIZE_MAX)
#define PSA_CRYPTO_TEST_SIZE_T_RANGE( x ) ( ( x ) <= SIZE_MAX )
#else
#define PSA_CRYPTO_TEST_SIZE_T_RANGE( x ) 1
#endif

/** An invalid export length that will never be set by psa_export_key(). */
static const size_t INVALID_EXPORT_LENGTH = ~0U;

/** Test if a buffer is all-bits zero.
 *
 * \param buffer    Pointer to the beginning of the buffer.
 * \param size      Size of the buffer in bytes.
 *
 * \return          1 if the buffer is all-bits-zero.
 * \return          0 if there is at least one nonzero byte.
 */
static int mem_is_zero( void *buffer, size_t size )
{
    size_t i;
    for( i = 0; i < size; i++ )
    {
        if( ( (unsigned char *) buffer )[i] != 0 )
            return( 0 );
    }
    return( 1 );
}

static int key_type_is_raw_bytes( psa_key_type_t type )
{
    psa_key_type_t category = type & PSA_KEY_TYPE_CATEGORY_MASK;
    return( category == PSA_KEY_TYPE_RAW_DATA ||
            category == PSA_KEY_TYPE_CATEGORY_SYMMETRIC );
}

/* Write the ASN.1 INTEGER with the value 2^(bits-1)+x backwards from *p. */
static int asn1_write_10x( unsigned char **p,
                           unsigned char *start,
                           size_t bits,
                           unsigned char x )
{
    int ret;
    int len = bits / 8 + 1;
    if( bits == 0 )
        return( MBEDTLS_ERR_ASN1_INVALID_DATA );
    if( bits <= 8 && x >= 1 << ( bits - 1 ) )
        return( MBEDTLS_ERR_ASN1_INVALID_DATA );
    if( *p < start || *p - start < (ssize_t) len )
        return( MBEDTLS_ERR_ASN1_BUF_TOO_SMALL );
    *p -= len;
    ( *p )[len-1] = x;
    if( bits % 8 == 0 )
        ( *p )[1] |= 1;
    else
        ( *p )[0] |= 1 << ( bits % 8 );
    MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, start, len ) );
    MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, start,
                                                       MBEDTLS_ASN1_INTEGER ) );
    return( len );
}

static int construct_fake_rsa_key( unsigned char *buffer,
                                   size_t buffer_size,
                                   unsigned char **p,
                                   size_t bits,
                                   int keypair )
{
    size_t half_bits = ( bits + 1 ) / 2;
    int ret;
    int len = 0;
    /* Construct something that looks like a DER encoding of
     * as defined by PKCS#1 v2.2 (RFC 8017) section A.1.2:
     *   RSAPrivateKey ::= SEQUENCE {
     *       version           Version,
     *       modulus           INTEGER,  -- n
     *       publicExponent    INTEGER,  -- e
     *       privateExponent   INTEGER,  -- d
     *       prime1            INTEGER,  -- p
     *       prime2            INTEGER,  -- q
     *       exponent1         INTEGER,  -- d mod (p-1)
     *       exponent2         INTEGER,  -- d mod (q-1)
     *       coefficient       INTEGER,  -- (inverse of q) mod p
     *       otherPrimeInfos   OtherPrimeInfos OPTIONAL
     *   }
     * Or, for a public key, the same structure with only
     * version, modulus and publicExponent.
     */
    *p = buffer + buffer_size;
    if( keypair )
    {
        MBEDTLS_ASN1_CHK_ADD( len, /* pq */
                              asn1_write_10x( p, buffer, half_bits, 1 ) );
        MBEDTLS_ASN1_CHK_ADD( len, /* dq */
                              asn1_write_10x( p, buffer, half_bits, 1 ) );
        MBEDTLS_ASN1_CHK_ADD( len, /* dp */
                              asn1_write_10x( p, buffer, half_bits, 1 ) );
        MBEDTLS_ASN1_CHK_ADD( len, /* q */
                              asn1_write_10x( p, buffer, half_bits, 1 ) );
        MBEDTLS_ASN1_CHK_ADD( len, /* p != q to pass mbedtls sanity checks */
                              asn1_write_10x( p, buffer, half_bits, 3 ) );
        MBEDTLS_ASN1_CHK_ADD( len, /* d */
                              asn1_write_10x( p, buffer, bits, 1 ) );
    }
    MBEDTLS_ASN1_CHK_ADD( len, /* e = 65537 */
                          asn1_write_10x( p, buffer, 17, 1 ) );
    MBEDTLS_ASN1_CHK_ADD( len, /* n */
                          asn1_write_10x( p, buffer, bits, 1 ) );
    if( keypair )
        MBEDTLS_ASN1_CHK_ADD( len, /* version = 0 */
                              mbedtls_asn1_write_int( p, buffer, 0 ) );
    MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_len( p, buffer, len ) );
    {
        const unsigned char tag =
            MBEDTLS_ASN1_CONSTRUCTED | MBEDTLS_ASN1_SEQUENCE;
        MBEDTLS_ASN1_CHK_ADD( len, mbedtls_asn1_write_tag( p, buffer, tag ) );
    }
    return( len );
}

static int exercise_mac_key( psa_key_slot_t key,
                             psa_key_usage_t usage,
                             psa_algorithm_t alg )
{
    psa_mac_operation_t operation;
    const unsigned char input[] = "foo";
    unsigned char mac[PSA_MAC_MAX_SIZE] = {0};
    size_t mac_length = sizeof( mac );

    if( usage & PSA_KEY_USAGE_SIGN )
    {
        TEST_ASSERT( psa_mac_sign_setup( &operation,
                                         key, alg ) == PSA_SUCCESS );
        TEST_ASSERT( psa_mac_update( &operation,
                                     input, sizeof( input ) ) == PSA_SUCCESS );
        TEST_ASSERT( psa_mac_sign_finish( &operation,
                                          mac, sizeof( input ),
                                          &mac_length ) == PSA_SUCCESS );
    }

    if( usage & PSA_KEY_USAGE_VERIFY )
    {
        psa_status_t verify_status =
            ( usage & PSA_KEY_USAGE_SIGN ?
              PSA_SUCCESS :
              PSA_ERROR_INVALID_SIGNATURE );
        TEST_ASSERT( psa_mac_verify_setup( &operation,
                                           key, alg ) == PSA_SUCCESS );
        TEST_ASSERT( psa_mac_update( &operation,
                                     input, sizeof( input ) ) == PSA_SUCCESS );
        TEST_ASSERT( psa_mac_verify_finish( &operation,
                                            mac,
                                            mac_length ) == verify_status );
    }

    return( 1 );

exit:
    psa_mac_abort( &operation );
    return( 0 );
}

static int exercise_cipher_key( psa_key_slot_t key,
                                psa_key_usage_t usage,
                                psa_algorithm_t alg )
{
    psa_cipher_operation_t operation;
    unsigned char iv[16] = {0};
    size_t iv_length = sizeof( iv );
    const unsigned char plaintext[16] = "Hello, world...";
    unsigned char ciphertext[32] = "(wabblewebblewibblewobblewubble)";
    size_t ciphertext_length = sizeof( ciphertext );
    unsigned char decrypted[sizeof( ciphertext )];
    size_t part_length;

    if( usage & PSA_KEY_USAGE_ENCRYPT )
    {
        TEST_ASSERT( psa_cipher_encrypt_setup( &operation,
                                               key, alg ) == PSA_SUCCESS );
        TEST_ASSERT( psa_cipher_generate_iv( &operation,
                                             iv, sizeof( iv ),
                                             &iv_length ) == PSA_SUCCESS );
        TEST_ASSERT( psa_cipher_update( &operation,
                                        plaintext, sizeof( plaintext ),
                                        ciphertext, sizeof( ciphertext ),
                                        &ciphertext_length ) == PSA_SUCCESS );
        TEST_ASSERT( psa_cipher_finish( &operation,
                                        ciphertext + ciphertext_length,
                                        sizeof( ciphertext ) - ciphertext_length,
                                        &part_length ) == PSA_SUCCESS );
        ciphertext_length += part_length;
    }

    if( usage & PSA_KEY_USAGE_DECRYPT )
    {
        psa_status_t status;
        psa_key_type_t type = PSA_KEY_TYPE_NONE;
        if( ! ( usage & PSA_KEY_USAGE_ENCRYPT ) )
        {
            size_t bits;
            TEST_ASSERT( psa_get_key_information( key, &type, &bits ) );
            iv_length = PSA_BLOCK_CIPHER_BLOCK_SIZE( type );
        }
        TEST_ASSERT( psa_cipher_decrypt_setup( &operation,
                                               key, alg ) == PSA_SUCCESS );
        TEST_ASSERT( psa_cipher_set_iv( &operation,
                                        iv, iv_length ) == PSA_SUCCESS );
        TEST_ASSERT( psa_cipher_update( &operation,
                                        ciphertext, ciphertext_length,
                                        decrypted, sizeof( decrypted ),
                                        &part_length ) == PSA_SUCCESS );
        status = psa_cipher_finish( &operation,
                                    decrypted + part_length,
                                    sizeof( decrypted ) - part_length,
                                    &part_length );
        /* For a stream cipher, all inputs are valid. For a block cipher,
         * if the input is some aribtrary data rather than an actual
         ciphertext, a padding error is likely.  */
        if( ( usage & PSA_KEY_USAGE_ENCRYPT ) ||
            PSA_BLOCK_CIPHER_BLOCK_SIZE( type ) == 1 )
            TEST_ASSERT( status == PSA_SUCCESS );
        else
            TEST_ASSERT( status == PSA_SUCCESS ||
                         status == PSA_ERROR_INVALID_PADDING );
    }

    return( 1 );

exit:
    psa_cipher_abort( &operation );
    return( 0 );
}

static int exercise_aead_key( psa_key_slot_t key,
                              psa_key_usage_t usage,
                              psa_algorithm_t alg )
{
    unsigned char nonce[16] = {0};
    size_t nonce_length = sizeof( nonce );
    unsigned char plaintext[16] = "Hello, world...";
    unsigned char ciphertext[48] = "(wabblewebblewibblewobblewubble)";
    size_t ciphertext_length = sizeof( ciphertext );
    size_t plaintext_length = sizeof( ciphertext );

    if( usage & PSA_KEY_USAGE_ENCRYPT )
    {
        TEST_ASSERT( psa_aead_encrypt( key, alg,
                                       nonce, nonce_length,
                                       NULL, 0,
                                       plaintext, sizeof( plaintext ),
                                       ciphertext, sizeof( ciphertext ),
                                       &ciphertext_length ) == PSA_SUCCESS );
    }

    if( usage & PSA_KEY_USAGE_DECRYPT )
    {
        psa_status_t verify_status =
            ( usage & PSA_KEY_USAGE_ENCRYPT ?
              PSA_SUCCESS :
              PSA_ERROR_INVALID_SIGNATURE );
        TEST_ASSERT( psa_aead_decrypt( key, alg,
                                       nonce, nonce_length,
                                       NULL, 0,
                                       ciphertext, ciphertext_length,
                                       plaintext, sizeof( plaintext ),
                                       &plaintext_length ) == verify_status );
    }

    return( 1 );

exit:
    return( 0 );
}

static int exercise_signature_key( psa_key_slot_t key,
                                   psa_key_usage_t usage,
                                   psa_algorithm_t alg )
{
    unsigned char payload[PSA_HASH_MAX_SIZE] = {1};
    size_t payload_length = 16;
    unsigned char signature[PSA_ASYMMETRIC_SIGNATURE_MAX_SIZE] = {0};
    size_t signature_length = sizeof( signature );

    if( usage & PSA_KEY_USAGE_SIGN )
    {
        /* Some algorithms require the payload to have the size of
         * the hash encoded in the algorithm. Use this input size
         * even for algorithms that allow other input sizes. */
        psa_algorithm_t hash_alg = PSA_ALG_SIGN_GET_HASH( alg );
        if( hash_alg != 0 )
            payload_length = PSA_HASH_SIZE( hash_alg );
        TEST_ASSERT( psa_asymmetric_sign( key, alg,
                                          payload, payload_length,
                                          signature, sizeof( signature ),
                                          &signature_length ) == PSA_SUCCESS );
    }

    if( usage & PSA_KEY_USAGE_VERIFY )
    {
        psa_status_t verify_status =
            ( usage & PSA_KEY_USAGE_SIGN ?
              PSA_SUCCESS :
              PSA_ERROR_INVALID_SIGNATURE );
        TEST_ASSERT( psa_asymmetric_verify( key, alg,
                                            payload, payload_length,
                                            signature, signature_length ) ==
                     verify_status );
    }

    return( 1 );

exit:
    return( 0 );
}

static int exercise_asymmetric_encryption_key( psa_key_slot_t key,
                                               psa_key_usage_t usage,
                                               psa_algorithm_t alg )
{
    unsigned char plaintext[256] = "Hello, world...";
    unsigned char ciphertext[256] = "(wabblewebblewibblewobblewubble)";
    size_t ciphertext_length = sizeof( ciphertext );
    size_t plaintext_length = 16;

    if( usage & PSA_KEY_USAGE_ENCRYPT )
    {
        TEST_ASSERT(
            psa_asymmetric_encrypt( key, alg,
                                    plaintext, plaintext_length,
                                    NULL, 0,
                                    ciphertext, sizeof( ciphertext ),
                                    &ciphertext_length ) == PSA_SUCCESS );
    }

    if( usage & PSA_KEY_USAGE_DECRYPT )
    {
        psa_status_t status =
            psa_asymmetric_decrypt( key, alg,
                                    ciphertext, ciphertext_length,
                                    NULL, 0,
                                    plaintext, sizeof( plaintext ),
                                    &plaintext_length );
        TEST_ASSERT( status == PSA_SUCCESS ||
                     ( ( usage & PSA_KEY_USAGE_ENCRYPT ) == 0 &&
                       ( status == PSA_ERROR_INVALID_ARGUMENT ||
                         status == PSA_ERROR_INVALID_PADDING ) ) );
    }

    return( 1 );

exit:
    return( 0 );
}

static int exercise_key( psa_key_slot_t slot,
                         psa_key_usage_t usage,
                         psa_algorithm_t alg )
{
    int ok;
    if( alg == 0 )
        ok = 1; /* If no algorihm, do nothing (used for raw data "keys"). */
    else if( PSA_ALG_IS_MAC( alg ) )
        ok = exercise_mac_key( slot, usage, alg );
    else if( PSA_ALG_IS_CIPHER( alg ) )
        ok = exercise_cipher_key( slot, usage, alg );
    else if( PSA_ALG_IS_AEAD( alg ) )
        ok = exercise_aead_key( slot, usage, alg );
    else if( PSA_ALG_IS_SIGN( alg ) )
        ok = exercise_signature_key( slot, usage, alg );
    else if( PSA_ALG_IS_ASYMMETRIC_ENCRYPTION( alg ) )
        ok = exercise_asymmetric_encryption_key( slot, usage, alg );
    else
    {
        char message[40];
        mbedtls_snprintf( message, sizeof( message ),
                          "No code to exercise alg=0x%08lx",
                          (unsigned long) alg );
        test_fail( message, __LINE__, __FILE__ );
        ok = 0;
    }
    return( ok );
}

/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_PSA_CRYPTO_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE */
void init_deinit( )
{
    psa_status_t status;
    int i;
    for( i = 0; i <= 1; i++ )
    {
        status = psa_crypto_init( );
        TEST_ASSERT( status == PSA_SUCCESS );
        status = psa_crypto_init( );
        TEST_ASSERT( status == PSA_SUCCESS );
        mbedtls_psa_crypto_free( );
    }
}
/* END_CASE */

/* BEGIN_CASE */
void import( data_t *data, int type, int expected_status_arg )
{
    int slot = 1;
    psa_status_t expected_status = expected_status_arg;
    psa_status_t status;

    TEST_ASSERT( data != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( data->len ) );
    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    status = psa_import_key( slot, type, data->x, data->len );
    TEST_ASSERT( status == expected_status );
    if( status == PSA_SUCCESS )
        TEST_ASSERT( psa_destroy_key( slot ) == PSA_SUCCESS );

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

/* BEGIN_CASE */
void import_rsa_made_up( int bits_arg, int keypair, int expected_status_arg )
{
    int slot = 1;
    size_t bits = bits_arg;
    psa_status_t expected_status = expected_status_arg;
    psa_status_t status;
    psa_key_type_t type =
        keypair ? PSA_KEY_TYPE_RSA_KEYPAIR : PSA_KEY_TYPE_RSA_PUBLIC_KEY;
    size_t buffer_size = /* Slight overapproximations */
        keypair ? bits * 9 / 16 + 80 : bits / 8 + 20;
    unsigned char *buffer = mbedtls_calloc( 1, buffer_size );
    unsigned char *p;
    int ret;
    size_t length;

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );
    TEST_ASSERT( buffer != NULL );

    TEST_ASSERT( ( ret = construct_fake_rsa_key( buffer, buffer_size, &p,
                                                 bits, keypair ) ) >= 0 );
    length = ret;

    /* Try importing the key */
    status = psa_import_key( slot, type, p, length );
    TEST_ASSERT( status == expected_status );
    if( status == PSA_SUCCESS )
        TEST_ASSERT( psa_destroy_key( slot ) == PSA_SUCCESS );

exit:
    mbedtls_free( buffer );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void import_export( data_t *data,
                    int type_arg,
                    int alg_arg,
                    int usage_arg,
                    int expected_bits,
                    int export_size_delta,
                    int expected_export_status_arg,
                    int canonical_input )
{
    int slot = 1;
    int slot2 = slot + 1;
    psa_key_type_t type = type_arg;
    psa_algorithm_t alg = alg_arg;
    psa_status_t expected_export_status = expected_export_status_arg;
    psa_status_t status;
    unsigned char *exported = NULL;
    unsigned char *reexported = NULL;
    size_t export_size;
    size_t exported_length = INVALID_EXPORT_LENGTH;
    size_t reexported_length;
    psa_key_type_t got_type;
    size_t got_bits;
    psa_key_policy_t policy;

    TEST_ASSERT( data != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( data->len ) );
    export_size = (ssize_t) data->len + export_size_delta;
    exported = mbedtls_calloc( 1, export_size );
    TEST_ASSERT( exported != NULL );
    if( ! canonical_input )
    {
        reexported = mbedtls_calloc( 1, export_size );
        TEST_ASSERT( reexported != NULL );
    }
    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, usage_arg, alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );

    /* Import the key */
    TEST_ASSERT( psa_import_key( slot, type,
                                 data->x, data->len ) == PSA_SUCCESS );

    /* Test the key information */
    TEST_ASSERT( psa_get_key_information( slot,
                                          &got_type,
                                          &got_bits ) == PSA_SUCCESS );
    TEST_ASSERT( got_type == type );
    TEST_ASSERT( got_bits == (size_t) expected_bits );

    /* Export the key */
    status = psa_export_key( slot,
                             exported, export_size,
                             &exported_length );
    TEST_ASSERT( status == expected_export_status );

    /* The exported length must be set by psa_export_key() to a value between 0
     * and export_size. On errors, the exported length must be 0. */
    TEST_ASSERT( exported_length != INVALID_EXPORT_LENGTH );
    TEST_ASSERT( status == PSA_SUCCESS || exported_length == 0 );
    TEST_ASSERT( exported_length <= export_size );

    TEST_ASSERT( mem_is_zero( exported + exported_length,
                              export_size - exported_length ) );
    if( status != PSA_SUCCESS )
    {
        TEST_ASSERT( exported_length == 0 );
        goto destroy;
    }

    if( canonical_input )
    {
        TEST_ASSERT( exported_length == data->len );
        TEST_ASSERT( memcmp( exported, data->x, data->len ) == 0 );
    }
    else
    {
        TEST_ASSERT( psa_set_key_policy( slot2, &policy ) == PSA_SUCCESS );

        TEST_ASSERT( psa_import_key( slot2, type,
                                     exported,
                                     export_size ) == PSA_SUCCESS );
        TEST_ASSERT( psa_export_key( slot2,
                                     reexported,
                                     export_size,
                                     &reexported_length ) == PSA_SUCCESS );
        TEST_ASSERT( reexported_length == exported_length );
        TEST_ASSERT( memcmp( reexported, exported,
                             exported_length ) == 0 );
    }

destroy:
    /* Destroy the key */
    TEST_ASSERT( psa_destroy_key( slot ) == PSA_SUCCESS );
    TEST_ASSERT( psa_get_key_information(
                     slot, NULL, NULL ) == PSA_ERROR_EMPTY_SLOT );

exit:
    mbedtls_free( exported );
    mbedtls_free( reexported );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void import_export_public_key( data_t *data,
                               int type_arg,
                               int alg_arg,
                               int expected_bits,
                               int public_key_expected_length,
                               int expected_export_status_arg )
{
    int slot = 1;
    psa_key_type_t type = type_arg;
    psa_algorithm_t alg = alg_arg;
    psa_status_t expected_export_status = expected_export_status_arg;
    psa_status_t status;
    unsigned char *exported = NULL;
    size_t export_size;
    size_t exported_length = INVALID_EXPORT_LENGTH;
    psa_key_type_t got_type;
    size_t got_bits;
    psa_key_policy_t policy;

    TEST_ASSERT( data != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( data->len ) );
    export_size = (ssize_t) data->len;
    exported = mbedtls_calloc( 1, export_size );
    TEST_ASSERT( exported != NULL );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_EXPORT, alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );

    /* Import the key */
    TEST_ASSERT( psa_import_key( slot, type,
                                 data->x, data->len ) == PSA_SUCCESS );

    /* Test the key information */
    TEST_ASSERT( psa_get_key_information( slot,
                                          &got_type,
                                          &got_bits ) == PSA_SUCCESS );
    TEST_ASSERT( got_type == type );
    TEST_ASSERT( got_bits == (size_t) expected_bits );

    /* Export the key */
    status = psa_export_public_key( slot,
                                    exported, export_size,
                                    &exported_length );
    TEST_ASSERT( status == expected_export_status );
    TEST_ASSERT( exported_length == (size_t) public_key_expected_length );
    TEST_ASSERT( mem_is_zero( exported + exported_length,
                              export_size - exported_length ) );
    if( status != PSA_SUCCESS )
        goto destroy;

destroy:
    /* Destroy the key */
    TEST_ASSERT( psa_destroy_key( slot ) == PSA_SUCCESS );
    TEST_ASSERT( psa_get_key_information(
                     slot, NULL, NULL ) == PSA_ERROR_EMPTY_SLOT );

exit:
    mbedtls_free( exported );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void import_and_exercise_key( data_t *data,
                              int type_arg,
                              int bits_arg,
                              int alg_arg )
{
    int slot = 1;
    psa_key_type_t type = type_arg;
    size_t bits = bits_arg;
    psa_algorithm_t alg = alg_arg;
    psa_key_usage_t usage =
        ( PSA_ALG_IS_MAC( alg ) || PSA_ALG_IS_SIGN( alg ) ?
          ( PSA_KEY_TYPE_IS_PUBLIC_KEY( type ) ?
            PSA_KEY_USAGE_VERIFY :
            PSA_KEY_USAGE_SIGN | PSA_KEY_USAGE_VERIFY ) :
          PSA_ALG_IS_CIPHER( alg ) || PSA_ALG_IS_AEAD( alg ) ||
          PSA_ALG_IS_ASYMMETRIC_ENCRYPTION( alg ) ?
          ( PSA_KEY_TYPE_IS_PUBLIC_KEY( type ) ?
            PSA_KEY_USAGE_ENCRYPT :
            PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT ) :
          0 );
    psa_key_policy_t policy;
    psa_key_type_t got_type;
    size_t got_bits;
    psa_status_t status;

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, usage, alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );

    /* Import the key */
    status = psa_import_key( slot, type, data->x, data->len );
    TEST_ASSERT( status == PSA_SUCCESS );

    /* Test the key information */
    TEST_ASSERT( psa_get_key_information( slot,
                                          &got_type,
                                          &got_bits ) == PSA_SUCCESS );
    TEST_ASSERT( got_type == type );
    TEST_ASSERT( got_bits == bits );

    /* Do something with the key according to its type and permitted usage. */
    if( ! exercise_key( slot, usage, alg ) )
        goto exit;

exit:
    psa_destroy_key( slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void key_policy( int usage_arg, int alg_arg )
{
    int key_slot = 1;
    psa_algorithm_t alg = alg_arg;
    psa_key_usage_t usage = usage_arg;
    psa_key_type_t key_type = PSA_KEY_TYPE_AES;
    unsigned char key[32] = {0};
    psa_key_policy_t policy_set;
    psa_key_policy_t policy_get;

    memset( key, 0x2a, sizeof( key ) );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy_set );
    psa_key_policy_init( &policy_get );

    psa_key_policy_set_usage( &policy_set, usage, alg );

    TEST_ASSERT( psa_key_policy_get_usage( &policy_set ) == usage );
    TEST_ASSERT( psa_key_policy_get_algorithm( &policy_set ) == alg );
    TEST_ASSERT( psa_set_key_policy( key_slot, &policy_set ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key, sizeof( key ) ) == PSA_SUCCESS );

    TEST_ASSERT( psa_get_key_policy( key_slot, &policy_get ) == PSA_SUCCESS );

    TEST_ASSERT( policy_get.usage == policy_set.usage );
    TEST_ASSERT( policy_get.alg == policy_set.alg );

exit:
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void mac_key_policy( int policy_usage,
                     int policy_alg,
                     int key_type,
                     data_t *key_data,
                     int exercise_alg )
{
    int key_slot = 1;
    psa_key_policy_t policy;
    psa_mac_operation_t operation;
    psa_status_t status;
    unsigned char mac[PSA_MAC_MAX_SIZE];

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, policy_usage, policy_alg );
    TEST_ASSERT( psa_set_key_policy( key_slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key_data->x, key_data->len ) == PSA_SUCCESS );

    status = psa_mac_sign_setup( &operation, key_slot, exercise_alg );
    if( policy_alg == exercise_alg &&
        ( policy_usage & PSA_KEY_USAGE_SIGN ) != 0 )
        TEST_ASSERT( status == PSA_SUCCESS );
    else
        TEST_ASSERT( status == PSA_ERROR_NOT_PERMITTED );
    psa_mac_abort( &operation );

    memset( mac, 0, sizeof( mac ) );
    status = psa_mac_verify_setup( &operation, key_slot, exercise_alg );
    if( policy_alg == exercise_alg &&
        ( policy_usage & PSA_KEY_USAGE_VERIFY ) != 0 )
        TEST_ASSERT( status == PSA_SUCCESS );
    else
        TEST_ASSERT( status == PSA_ERROR_NOT_PERMITTED );

exit:
    psa_mac_abort( &operation );
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void cipher_key_policy( int policy_usage,
                        int policy_alg,
                        int key_type,
                        data_t *key_data,
                        int exercise_alg )
{
    int key_slot = 1;
    psa_key_policy_t policy;
    psa_cipher_operation_t operation;
    psa_status_t status;

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, policy_usage, policy_alg );
    TEST_ASSERT( psa_set_key_policy( key_slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key_data->x, key_data->len ) == PSA_SUCCESS );

    status = psa_cipher_encrypt_setup( &operation, key_slot, exercise_alg );
    if( policy_alg == exercise_alg &&
        ( policy_usage & PSA_KEY_USAGE_ENCRYPT ) != 0 )
        TEST_ASSERT( status == PSA_SUCCESS );
    else
        TEST_ASSERT( status == PSA_ERROR_NOT_PERMITTED );
    psa_cipher_abort( &operation );

    status = psa_cipher_decrypt_setup( &operation, key_slot, exercise_alg );
    if( policy_alg == exercise_alg &&
        ( policy_usage & PSA_KEY_USAGE_DECRYPT ) != 0 )
        TEST_ASSERT( status == PSA_SUCCESS );
    else
        TEST_ASSERT( status == PSA_ERROR_NOT_PERMITTED );

exit:
    psa_cipher_abort( &operation );
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void aead_key_policy( int policy_usage,
                      int policy_alg,
                      int key_type,
                      data_t *key_data,
                      int nonce_length_arg,
                      int tag_length_arg,
                      int exercise_alg )
{
    int key_slot = 1;
    psa_key_policy_t policy;
    psa_status_t status;
    unsigned char nonce[16] = {0};
    size_t nonce_length = nonce_length_arg;
    unsigned char tag[16];
    size_t tag_length = tag_length_arg;
    size_t output_length;

    TEST_ASSERT( nonce_length <= sizeof( nonce ) );
    TEST_ASSERT( tag_length <= sizeof( tag ) );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, policy_usage, policy_alg );
    TEST_ASSERT( psa_set_key_policy( key_slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key_data->x, key_data->len ) == PSA_SUCCESS );

    status = psa_aead_encrypt( key_slot, exercise_alg,
                               nonce, nonce_length,
                               NULL, 0,
                               NULL, 0,
                               tag, tag_length,
                               &output_length );
    if( policy_alg == exercise_alg &&
        ( policy_usage & PSA_KEY_USAGE_ENCRYPT ) != 0 )
        TEST_ASSERT( status == PSA_SUCCESS );
    else
        TEST_ASSERT( status == PSA_ERROR_NOT_PERMITTED );

    memset( tag, 0, sizeof( tag ) );
    status = psa_aead_decrypt( key_slot, exercise_alg,
                               nonce, nonce_length,
                               NULL, 0,
                               tag, tag_length,
                               NULL, 0,
                               &output_length );
    if( policy_alg == exercise_alg &&
        ( policy_usage & PSA_KEY_USAGE_DECRYPT ) != 0 )
        TEST_ASSERT( status == PSA_ERROR_INVALID_SIGNATURE );
    else
        TEST_ASSERT( status == PSA_ERROR_NOT_PERMITTED );

exit:
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void asymmetric_encryption_key_policy( int policy_usage,
                                       int policy_alg,
                                       int key_type,
                                       data_t *key_data,
                                       int exercise_alg )
{
    int key_slot = 1;
    psa_key_policy_t policy;
    psa_status_t status;
    size_t key_bits;
    size_t buffer_length;
    unsigned char *buffer = NULL;
    size_t output_length;

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, policy_usage, policy_alg );
    TEST_ASSERT( psa_set_key_policy( key_slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key_data->x, key_data->len ) == PSA_SUCCESS );

    TEST_ASSERT( psa_get_key_information( key_slot,
                                          NULL,
                                          &key_bits ) == PSA_SUCCESS );
    buffer_length = PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE( key_type, key_bits,
                                                        exercise_alg );
    buffer = mbedtls_calloc( 1, buffer_length );
    TEST_ASSERT( buffer != NULL );

    status = psa_asymmetric_encrypt( key_slot, exercise_alg,
                                     NULL, 0,
                                     NULL, 0,
                                     buffer, buffer_length,
                                     &output_length );
    if( policy_alg == exercise_alg &&
        ( policy_usage & PSA_KEY_USAGE_ENCRYPT ) != 0 )
        TEST_ASSERT( status == PSA_SUCCESS );
    else
        TEST_ASSERT( status == PSA_ERROR_NOT_PERMITTED );

    memset( buffer, 0, buffer_length );
    status = psa_asymmetric_decrypt( key_slot, exercise_alg,
                                     buffer, buffer_length,
                                     NULL, 0,
                                     buffer, buffer_length,
                                     &output_length );
    if( policy_alg == exercise_alg &&
        ( policy_usage & PSA_KEY_USAGE_DECRYPT ) != 0 )
        TEST_ASSERT( status == PSA_ERROR_INVALID_PADDING );
    else
        TEST_ASSERT( status == PSA_ERROR_NOT_PERMITTED );

exit:
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
    mbedtls_free( buffer );
}
/* END_CASE */

/* BEGIN_CASE */
void asymmetric_signature_key_policy( int policy_usage,
                                      int policy_alg,
                                      int key_type,
                                      data_t *key_data,
                                      int exercise_alg )
{
    int key_slot = 1;
    psa_key_policy_t policy;
    psa_status_t status;
    unsigned char payload[16] = {1};
    size_t payload_length = sizeof( payload );
    unsigned char signature[PSA_ASYMMETRIC_SIGNATURE_MAX_SIZE] = {0};
    size_t signature_length;

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, policy_usage, policy_alg );
    TEST_ASSERT( psa_set_key_policy( key_slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key_data->x, key_data->len ) == PSA_SUCCESS );

    status = psa_asymmetric_sign( key_slot, exercise_alg,
                                  payload, payload_length,
                                  signature, sizeof( signature ),
                                  &signature_length );
    if( policy_alg == exercise_alg &&
        ( policy_usage & PSA_KEY_USAGE_SIGN ) != 0 )
        TEST_ASSERT( status == PSA_SUCCESS );
    else
        TEST_ASSERT( status == PSA_ERROR_NOT_PERMITTED );

    memset( signature, 0, sizeof( signature ) );
    status = psa_asymmetric_verify( key_slot, exercise_alg,
                                    payload, payload_length,
                                    signature, sizeof( signature ) );
    if( policy_alg == exercise_alg &&
        ( policy_usage & PSA_KEY_USAGE_VERIFY ) != 0 )
        TEST_ASSERT( status == PSA_ERROR_INVALID_SIGNATURE );
    else
        TEST_ASSERT( status == PSA_ERROR_NOT_PERMITTED );

exit:
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void key_lifetime( int lifetime_arg )
{
    int key_slot = 1;
    psa_key_type_t key_type = PSA_ALG_CBC_BASE;
    unsigned char key[32] = {0};
    psa_key_lifetime_t lifetime_set = lifetime_arg;
    psa_key_lifetime_t lifetime_get;

    memset( key, 0x2a, sizeof( key ) );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    TEST_ASSERT( psa_set_key_lifetime( key_slot,
                                       lifetime_set ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key, sizeof( key ) ) == PSA_SUCCESS );

    TEST_ASSERT( psa_get_key_lifetime( key_slot,
                                       &lifetime_get ) == PSA_SUCCESS );

    TEST_ASSERT( lifetime_get == lifetime_set );

exit:
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void key_lifetime_set_fail( int key_slot_arg,
                            int lifetime_arg,
                            int expected_status_arg )
{
    psa_key_slot_t key_slot = key_slot_arg;
    psa_key_lifetime_t lifetime_set = lifetime_arg;
    psa_status_t actual_status;
    psa_status_t expected_status = expected_status_arg;

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    actual_status = psa_set_key_lifetime( key_slot, lifetime_set );

    if( actual_status == PSA_SUCCESS )
        actual_status = psa_set_key_lifetime( key_slot, lifetime_set );

    TEST_ASSERT( expected_status == actual_status );

exit:
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void hash_setup( int alg_arg,
                 int expected_status_arg )
{
    psa_algorithm_t alg = alg_arg;
    psa_status_t expected_status = expected_status_arg;
    psa_hash_operation_t operation;
    psa_status_t status;

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    status = psa_hash_setup( &operation, alg );
    psa_hash_abort( &operation );
    TEST_ASSERT( status == expected_status );

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

/* BEGIN_CASE */
void hash_finish( int alg_arg, data_t *input, data_t *expected_hash )
{
    psa_algorithm_t alg = alg_arg;
    unsigned char actual_hash[PSA_HASH_MAX_SIZE];
    size_t actual_hash_length;
    psa_hash_operation_t operation;

    TEST_ASSERT( expected_hash->len == PSA_HASH_SIZE( alg ) );
    TEST_ASSERT( expected_hash->len <= PSA_HASH_MAX_SIZE );

    TEST_ASSERT( input != NULL );
    TEST_ASSERT( expected_hash != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( expected_hash->len ) );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    TEST_ASSERT( psa_hash_setup( &operation, alg ) == PSA_SUCCESS );
    TEST_ASSERT( psa_hash_update( &operation,
                                  input->x, input->len ) == PSA_SUCCESS );
    TEST_ASSERT( psa_hash_finish( &operation,
                                  actual_hash, sizeof( actual_hash ),
                                  &actual_hash_length ) == PSA_SUCCESS );
    TEST_ASSERT( actual_hash_length == expected_hash->len );
    TEST_ASSERT( memcmp( expected_hash->x, actual_hash,
                         expected_hash->len ) == 0 );

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

/* BEGIN_CASE */
void hash_verify( int alg_arg, data_t *input, data_t *expected_hash )
{
    psa_algorithm_t alg = alg_arg;
    psa_hash_operation_t operation;

    TEST_ASSERT( expected_hash->len == PSA_HASH_SIZE( alg ) );
    TEST_ASSERT( expected_hash->len <= PSA_HASH_MAX_SIZE );

    TEST_ASSERT( input != NULL );
    TEST_ASSERT( expected_hash != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( expected_hash->len ) );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    TEST_ASSERT( psa_hash_setup( &operation, alg ) == PSA_SUCCESS );
    TEST_ASSERT( psa_hash_update( &operation,
                                  input->x,
                                  input->len ) == PSA_SUCCESS );
    TEST_ASSERT( psa_hash_verify( &operation,
                                  expected_hash->x,
                                  expected_hash->len ) == PSA_SUCCESS );

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

/* BEGIN_CASE */
void mac_setup( int key_type_arg,
                data_t *key,
                int alg_arg,
                int expected_status_arg )
{
    int key_slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    psa_status_t expected_status = expected_status_arg;
    psa_mac_operation_t operation;
    psa_key_policy_t policy;
    psa_status_t status;

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy,
                              PSA_KEY_USAGE_SIGN | PSA_KEY_USAGE_VERIFY,
                              alg );
    TEST_ASSERT( psa_set_key_policy( key_slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key->x, key->len ) == PSA_SUCCESS );

    status = psa_mac_sign_setup( &operation, key_slot, alg );
    psa_mac_abort( &operation );
    TEST_ASSERT( status == expected_status );

exit:
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void mac_verify( int key_type_arg,
                 data_t *key,
                 int alg_arg,
                 data_t *input,
                 data_t *expected_mac )
{
    int key_slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    psa_mac_operation_t operation;
    psa_key_policy_t policy;

    TEST_ASSERT( expected_mac->len <= PSA_MAC_MAX_SIZE );

    TEST_ASSERT( key != NULL );
    TEST_ASSERT( input != NULL );
    TEST_ASSERT( expected_mac != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( expected_mac->len ) );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_VERIFY, alg );
    TEST_ASSERT( psa_set_key_policy( key_slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key->x, key->len ) == PSA_SUCCESS );

    TEST_ASSERT( psa_mac_verify_setup( &operation,
                                       key_slot, alg ) == PSA_SUCCESS );
    TEST_ASSERT( psa_destroy_key( key_slot ) == PSA_SUCCESS );
    TEST_ASSERT( psa_mac_update( &operation,
                                 input->x, input->len ) == PSA_SUCCESS );
    TEST_ASSERT( psa_mac_verify_finish( &operation,
                                        expected_mac->x,
                                        expected_mac->len ) == PSA_SUCCESS );

exit:
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void cipher_setup( int key_type_arg,
                   data_t *key,
                   int alg_arg,
                   int expected_status_arg )
{
    int key_slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    psa_status_t expected_status = expected_status_arg;
    psa_cipher_operation_t operation;
    psa_key_policy_t policy;
    psa_status_t status;

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_ENCRYPT, alg );
    TEST_ASSERT( psa_set_key_policy( key_slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key->x, key->len ) == PSA_SUCCESS );

    status = psa_cipher_encrypt_setup( &operation, key_slot, alg );
    psa_cipher_abort( &operation );
    TEST_ASSERT( status == expected_status );

exit:
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void cipher_encrypt( int alg_arg, int key_type_arg,
                     data_t *key,
                     data_t *input, data_t *expected_output,
                     int expected_status_arg )
{
    int key_slot = 1;
    psa_status_t status;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    psa_status_t expected_status = expected_status_arg;
    unsigned char iv[16] = {0};
    size_t iv_size;
    unsigned char *output = NULL;
    size_t output_buffer_size = 0;
    size_t function_output_length = 0;
    size_t total_output_length = 0;
    psa_cipher_operation_t operation;
    psa_key_policy_t policy;

    TEST_ASSERT( key != NULL );
    TEST_ASSERT( input != NULL );
    TEST_ASSERT( expected_output != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( expected_output->len ) );

    iv_size = PSA_BLOCK_CIPHER_BLOCK_SIZE( key_type );
    memset( iv, 0x2a, iv_size );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_ENCRYPT, alg );
    TEST_ASSERT( psa_set_key_policy( key_slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key->x, key->len ) == PSA_SUCCESS );

    TEST_ASSERT( psa_cipher_encrypt_setup( &operation,
                                           key_slot, alg ) == PSA_SUCCESS );

    TEST_ASSERT( psa_cipher_set_iv( &operation,
                                    iv, iv_size ) == PSA_SUCCESS );
    output_buffer_size = (size_t) input->len +
                         PSA_BLOCK_CIPHER_BLOCK_SIZE( key_type );
    output = mbedtls_calloc( 1, output_buffer_size );
    TEST_ASSERT( output != NULL );

    TEST_ASSERT( psa_cipher_update( &operation,
                                    input->x, input->len,
                                    output, output_buffer_size,
                                    &function_output_length ) == PSA_SUCCESS );
    total_output_length += function_output_length;
    status = psa_cipher_finish( &operation,
                                output + function_output_length,
                                output_buffer_size,
                                &function_output_length );
    total_output_length += function_output_length;

    TEST_ASSERT( status == expected_status );
    if( expected_status == PSA_SUCCESS )
    {
        TEST_ASSERT( psa_cipher_abort( &operation ) == PSA_SUCCESS );
        TEST_ASSERT( total_output_length == expected_output->len );
        TEST_ASSERT( memcmp( expected_output->x, output,
                             expected_output->len ) == 0 );
    }

exit:
    mbedtls_free( output );
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void cipher_encrypt_multipart( int alg_arg, int key_type_arg,
                               data_t *key,
                               data_t *input,
                               int first_part_size,
                               data_t *expected_output )
{
    int key_slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    unsigned char iv[16] = {0};
    size_t iv_size;
    unsigned char *output = NULL;
    size_t output_buffer_size = 0;
    size_t function_output_length = 0;
    size_t total_output_length = 0;
    psa_cipher_operation_t operation;
    psa_key_policy_t policy;

    TEST_ASSERT( key != NULL );
    TEST_ASSERT( input != NULL );
    TEST_ASSERT( expected_output != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( expected_output->len ) );

    iv_size = PSA_BLOCK_CIPHER_BLOCK_SIZE( key_type );
    memset( iv, 0x2a, iv_size );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_ENCRYPT, alg );
    TEST_ASSERT( psa_set_key_policy( key_slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key->x, key->len ) == PSA_SUCCESS );

    TEST_ASSERT( psa_cipher_encrypt_setup( &operation,
                                           key_slot, alg ) == PSA_SUCCESS );

    TEST_ASSERT( psa_cipher_set_iv( &operation,
                                    iv, sizeof( iv ) ) == PSA_SUCCESS );
    output_buffer_size = (size_t) input->len +
                         PSA_BLOCK_CIPHER_BLOCK_SIZE( key_type );
    output = mbedtls_calloc( 1, output_buffer_size );
    TEST_ASSERT( output != NULL );

    TEST_ASSERT( (unsigned int) first_part_size < input->len );
    TEST_ASSERT( psa_cipher_update( &operation, input->x, first_part_size,
                                    output, output_buffer_size,
                                    &function_output_length ) == PSA_SUCCESS );
    total_output_length += function_output_length;
    TEST_ASSERT( psa_cipher_update( &operation,
                                    input->x + first_part_size,
                                    input->len - first_part_size,
                                    output, output_buffer_size,
                                    &function_output_length ) == PSA_SUCCESS );
    total_output_length += function_output_length;
    TEST_ASSERT( psa_cipher_finish( &operation,
                                    output + function_output_length,
                                    output_buffer_size,
                                    &function_output_length ) == PSA_SUCCESS );
    total_output_length += function_output_length;
    TEST_ASSERT( psa_cipher_abort( &operation ) == PSA_SUCCESS );

    TEST_ASSERT( total_output_length == expected_output->len );
    TEST_ASSERT( memcmp( expected_output->x, output,
                         expected_output->len ) == 0 );

exit:
    mbedtls_free( output );
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void cipher_decrypt_multipart( int alg_arg, int key_type_arg,
                               data_t *key,
                               data_t *input,
                               int first_part_size,
                               data_t *expected_output )
{
    int key_slot = 1;

    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    unsigned char iv[16] = {0};
    size_t iv_size;
    unsigned char *output = NULL;
    size_t output_buffer_size = 0;
    size_t function_output_length = 0;
    size_t total_output_length = 0;
    psa_cipher_operation_t operation;
    psa_key_policy_t policy;

    TEST_ASSERT( key != NULL );
    TEST_ASSERT( input != NULL );
    TEST_ASSERT( expected_output != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( expected_output->len ) );

    iv_size = PSA_BLOCK_CIPHER_BLOCK_SIZE( key_type );
    memset( iv, 0x2a, iv_size );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_DECRYPT, alg );
    TEST_ASSERT( psa_set_key_policy( key_slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key->x, key->len ) == PSA_SUCCESS );

    TEST_ASSERT( psa_cipher_decrypt_setup( &operation,
                                           key_slot, alg ) == PSA_SUCCESS );

    TEST_ASSERT( psa_cipher_set_iv( &operation,
                                    iv, sizeof( iv ) ) == PSA_SUCCESS );

    output_buffer_size = (size_t) input->len +
                         PSA_BLOCK_CIPHER_BLOCK_SIZE( key_type );
    output = mbedtls_calloc( 1, output_buffer_size );
    TEST_ASSERT( output != NULL );

    TEST_ASSERT( (unsigned int) first_part_size < input->len );
    TEST_ASSERT( psa_cipher_update( &operation,
                                    input->x, first_part_size,
                                    output, output_buffer_size,
                                    &function_output_length ) == PSA_SUCCESS );
    total_output_length += function_output_length;
    TEST_ASSERT( psa_cipher_update( &operation,
                                    input->x + first_part_size,
                                    input->len - first_part_size,
                                    output, output_buffer_size,
                                    &function_output_length ) == PSA_SUCCESS );
    total_output_length += function_output_length;
    TEST_ASSERT( psa_cipher_finish( &operation,
                                    output + function_output_length,
                                    output_buffer_size,
                                    &function_output_length ) == PSA_SUCCESS );
    total_output_length += function_output_length;
    TEST_ASSERT( psa_cipher_abort( &operation ) == PSA_SUCCESS );

    TEST_ASSERT( total_output_length == expected_output->len );
    TEST_ASSERT( memcmp( expected_output->x, output,
                         expected_output->len ) == 0 );

exit:
    mbedtls_free( output );
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void cipher_decrypt( int alg_arg, int key_type_arg,
                     data_t *key,
                     data_t *input, data_t *expected_output,
                     int expected_status_arg )
{
    int key_slot = 1;
    psa_status_t status;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    psa_status_t expected_status = expected_status_arg;
    unsigned char iv[16] = {0};
    size_t iv_size;
    unsigned char *output = NULL;
    size_t output_buffer_size = 0;
    size_t function_output_length = 0;
    size_t total_output_length = 0;
    psa_cipher_operation_t operation;
    psa_key_policy_t policy;

    TEST_ASSERT( key != NULL );
    TEST_ASSERT( input != NULL );
    TEST_ASSERT( expected_output != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( expected_output->len ) );

    iv_size = PSA_BLOCK_CIPHER_BLOCK_SIZE( key_type );
    memset( iv, 0x2a, iv_size );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_DECRYPT, alg );
    TEST_ASSERT( psa_set_key_policy( key_slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key->x, key->len ) == PSA_SUCCESS );

    TEST_ASSERT( psa_cipher_decrypt_setup( &operation,
                                           key_slot, alg ) == PSA_SUCCESS );

    TEST_ASSERT( psa_cipher_set_iv( &operation,
                                    iv, iv_size ) == PSA_SUCCESS );

    output_buffer_size = (size_t) input->len +
                         PSA_BLOCK_CIPHER_BLOCK_SIZE( key_type );
    output = mbedtls_calloc( 1, output_buffer_size );
    TEST_ASSERT( output != NULL );

    TEST_ASSERT( psa_cipher_update( &operation,
                                    input->x, input->len,
                                    output, output_buffer_size,
                                    &function_output_length ) == PSA_SUCCESS );
    total_output_length += function_output_length;
    status = psa_cipher_finish( &operation,
                                output + function_output_length,
                                output_buffer_size,
                                &function_output_length );
    total_output_length += function_output_length;
    TEST_ASSERT( status == expected_status );

    if( expected_status == PSA_SUCCESS )
    {
        TEST_ASSERT( psa_cipher_abort( &operation ) == PSA_SUCCESS );
        TEST_ASSERT( total_output_length == expected_output->len );
        TEST_ASSERT( memcmp( expected_output->x, output,
                             expected_output->len ) == 0 );
    }

exit:
    mbedtls_free( output );
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void cipher_verify_output( int alg_arg, int key_type_arg,
                           data_t *key,
                           data_t *input )
{
    int key_slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    unsigned char iv[16] = {0};
    size_t iv_size = 16;
    size_t iv_length = 0;
    unsigned char *output1 = NULL;
    size_t output1_size = 0;
    size_t output1_length = 0;
    unsigned char *output2 = NULL;
    size_t output2_size = 0;
    size_t output2_length = 0;
    size_t function_output_length = 0;
    psa_cipher_operation_t operation1;
    psa_cipher_operation_t operation2;
    psa_key_policy_t policy;

    TEST_ASSERT( key != NULL );
    TEST_ASSERT( input != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input->len ) );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT, alg );
    TEST_ASSERT( psa_set_key_policy( key_slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key->x, key->len ) == PSA_SUCCESS );

    TEST_ASSERT( psa_cipher_encrypt_setup( &operation1,
                                           key_slot, alg ) == PSA_SUCCESS );
    TEST_ASSERT( psa_cipher_decrypt_setup( &operation2,
                                           key_slot, alg ) == PSA_SUCCESS );

    TEST_ASSERT( psa_cipher_generate_iv( &operation1,
                                         iv, iv_size,
                                         &iv_length ) == PSA_SUCCESS );
    output1_size = (size_t) input->len +
                   PSA_BLOCK_CIPHER_BLOCK_SIZE( key_type );
    output1 = mbedtls_calloc( 1, output1_size );
    TEST_ASSERT( output1 != NULL );

    TEST_ASSERT( psa_cipher_update( &operation1, input->x, input->len,
                                    output1, output1_size,
                                    &output1_length ) == PSA_SUCCESS );
    TEST_ASSERT( psa_cipher_finish( &operation1,
                                    output1 + output1_length, output1_size,
                                    &function_output_length ) == PSA_SUCCESS );

    output1_length += function_output_length;

    TEST_ASSERT( psa_cipher_abort( &operation1 ) == PSA_SUCCESS );

    output2_size = output1_length;
    output2 = mbedtls_calloc( 1, output2_size );
    TEST_ASSERT( output2 != NULL );

    TEST_ASSERT( psa_cipher_set_iv( &operation2,
                                    iv, iv_length ) == PSA_SUCCESS );
    TEST_ASSERT( psa_cipher_update( &operation2, output1, output1_length,
                                    output2, output2_size,
                                    &output2_length ) == PSA_SUCCESS );
    function_output_length = 0;
    TEST_ASSERT( psa_cipher_finish( &operation2,
                                    output2 + output2_length,
                                    output2_size,
                                    &function_output_length ) == PSA_SUCCESS );

    output2_length += function_output_length;

    TEST_ASSERT( psa_cipher_abort( &operation2 ) == PSA_SUCCESS );

    TEST_ASSERT( input->len == output2_length );
    TEST_ASSERT( memcmp( input->x, output2, input->len ) == 0 );

exit:
    mbedtls_free( output1 );
    mbedtls_free( output2 );
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void cipher_verify_output_multipart( int alg_arg,
                                     int key_type_arg,
                                     data_t *key,
                                     data_t *input,
                                     int first_part_size )
{
    int key_slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    unsigned char iv[16] = {0};
    size_t iv_size = 16;
    size_t iv_length = 0;
    unsigned char *output1 = NULL;
    size_t output1_buffer_size = 0;
    size_t output1_length = 0;
    unsigned char *output2 = NULL;
    size_t output2_buffer_size = 0;
    size_t output2_length = 0;
    size_t function_output_length;
    psa_cipher_operation_t operation1;
    psa_cipher_operation_t operation2;
    psa_key_policy_t policy;

    TEST_ASSERT( key != NULL );
    TEST_ASSERT( input != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input->len ) );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT, alg );
    TEST_ASSERT( psa_set_key_policy( key_slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( key_slot, key_type,
                                 key->x, key->len ) == PSA_SUCCESS );

    TEST_ASSERT( psa_cipher_encrypt_setup( &operation1,
                                           key_slot, alg ) == PSA_SUCCESS );
    TEST_ASSERT( psa_cipher_decrypt_setup( &operation2,
                                           key_slot, alg ) == PSA_SUCCESS );

    TEST_ASSERT( psa_cipher_generate_iv( &operation1,
                                         iv, iv_size,
                                         &iv_length ) == PSA_SUCCESS );
    output1_buffer_size = (size_t) input->len +
                          PSA_BLOCK_CIPHER_BLOCK_SIZE( key_type );
    output1 = mbedtls_calloc( 1, output1_buffer_size );
    TEST_ASSERT( output1 != NULL );

    TEST_ASSERT( (unsigned int) first_part_size < input->len );

    TEST_ASSERT( psa_cipher_update( &operation1, input->x, first_part_size,
                                    output1, output1_buffer_size,
                                    &function_output_length ) == PSA_SUCCESS );
    output1_length += function_output_length;

    TEST_ASSERT( psa_cipher_update( &operation1,
                                    input->x + first_part_size,
                                    input->len - first_part_size,
                                    output1, output1_buffer_size,
                                    &function_output_length ) == PSA_SUCCESS );
    output1_length += function_output_length;

    TEST_ASSERT( psa_cipher_finish( &operation1,
                                    output1 + output1_length,
                                    output1_buffer_size - output1_length,
                                    &function_output_length ) == PSA_SUCCESS );
    output1_length += function_output_length;

    TEST_ASSERT( psa_cipher_abort( &operation1 ) == PSA_SUCCESS );

    output2_buffer_size = output1_length;
    output2 = mbedtls_calloc( 1, output2_buffer_size );
    TEST_ASSERT( output2 != NULL );

    TEST_ASSERT( psa_cipher_set_iv( &operation2,
                                    iv, iv_length ) == PSA_SUCCESS );

    TEST_ASSERT( psa_cipher_update( &operation2, output1, first_part_size,
                                    output2, output2_buffer_size,
                                    &function_output_length ) == PSA_SUCCESS );
    output2_length += function_output_length;

    TEST_ASSERT( psa_cipher_update( &operation2,
                                    output1 + first_part_size,
                                    output1_length - first_part_size,
                                    output2, output2_buffer_size,
                                    &function_output_length ) == PSA_SUCCESS );
    output2_length += function_output_length;

    TEST_ASSERT( psa_cipher_finish( &operation2,
                                    output2 + output2_length,
                                    output2_buffer_size - output2_length,
                                    &function_output_length ) == PSA_SUCCESS );
    output2_length += function_output_length;

    TEST_ASSERT( psa_cipher_abort( &operation2 ) == PSA_SUCCESS );

    TEST_ASSERT( input->len == output2_length );
    TEST_ASSERT( memcmp( input->x, output2, input->len ) == 0 );

exit:
    mbedtls_free( output1 );
    mbedtls_free( output2 );
    psa_destroy_key( key_slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void aead_encrypt_decrypt( int key_type_arg,
                           data_t * key_data,
                           int alg_arg,
                           data_t * input_data,
                           data_t * nonce,
                           data_t * additional_data,
                           int expected_result_arg )
{
    int slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    unsigned char *output_data = NULL;
    size_t output_size = 0;
    size_t output_length = 0;
    unsigned char *output_data2 = NULL;
    size_t output_length2 = 0;
    size_t tag_length = 16;
    psa_status_t expected_result = expected_result_arg;
    psa_key_policy_t policy;

    TEST_ASSERT( key_data != NULL );
    TEST_ASSERT( input_data != NULL );
    TEST_ASSERT( nonce != NULL );
    TEST_ASSERT( additional_data != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( nonce->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( additional_data->len ) );

    output_size = input_data->len + tag_length;
    output_data = mbedtls_calloc( 1, output_size );
    TEST_ASSERT( output_data != NULL );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy,
                              PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT,
                              alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( slot, key_type,
                                 key_data->x, key_data->len ) == PSA_SUCCESS );

    TEST_ASSERT( psa_aead_encrypt( slot, alg,
                                   nonce->x, nonce->len,
                                   additional_data->x,
                                   additional_data->len,
                                   input_data->x, input_data->len,
                                   output_data, output_size,
                                   &output_length ) == expected_result );

    if( PSA_SUCCESS == expected_result )
    {
        output_data2 = mbedtls_calloc( 1, output_length );
        TEST_ASSERT( output_data2 != NULL );

        TEST_ASSERT( psa_aead_decrypt( slot, alg,
                                       nonce->x, nonce->len,
                                       additional_data->x,
                                       additional_data->len,
                                       output_data, output_length,
                                       output_data2, output_length,
                                       &output_length2 ) == expected_result );

        TEST_ASSERT( memcmp( input_data->x, output_data2,
                             input_data->len ) == 0 );
    }

exit:
    psa_destroy_key( slot );
    mbedtls_free( output_data );
    mbedtls_free( output_data2 );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void aead_encrypt( int key_type_arg, data_t * key_data,
                   int alg_arg, data_t * input_data,
                   data_t * additional_data, data_t * nonce,
                   data_t * expected_result )
{
    int slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    unsigned char *output_data = NULL;
    size_t output_size = 0;
    size_t output_length = 0;
    size_t tag_length = 16;
    psa_key_policy_t policy;

    TEST_ASSERT( key_data != NULL );
    TEST_ASSERT( input_data != NULL );
    TEST_ASSERT( additional_data != NULL );
    TEST_ASSERT( nonce != NULL );
    TEST_ASSERT( expected_result != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( additional_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( nonce->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( expected_result->len ) );

    output_size = input_data->len + tag_length;
    output_data = mbedtls_calloc( 1, output_size );
    TEST_ASSERT( output_data != NULL );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_ENCRYPT , alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( slot, key_type,
                                 key_data->x,
                                 key_data->len ) == PSA_SUCCESS );

    TEST_ASSERT( psa_aead_encrypt( slot, alg,
                                   nonce->x, nonce->len,
                                   additional_data->x, additional_data->len,
                                   input_data->x, input_data->len,
                                   output_data, output_size,
                                   &output_length ) == PSA_SUCCESS );

    TEST_ASSERT( memcmp( output_data, expected_result->x,
                         output_length ) == 0 );

exit:
    psa_destroy_key( slot );
    mbedtls_free( output_data );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void aead_decrypt( int key_type_arg, data_t * key_data,
                   int alg_arg, data_t * input_data,
                   data_t * additional_data, data_t * nonce,
                   data_t * expected_data, int expected_result_arg )
{
    int slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    unsigned char *output_data = NULL;
    size_t output_size = 0;
    size_t output_length = 0;
    size_t tag_length = 16;
    psa_key_policy_t policy;
    psa_status_t expected_result = expected_result_arg;

    TEST_ASSERT( key_data != NULL );
    TEST_ASSERT( input_data != NULL );
    TEST_ASSERT( additional_data != NULL );
    TEST_ASSERT( nonce != NULL );
    TEST_ASSERT( expected_data != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( additional_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( nonce->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( expected_data->len ) );

    output_size = input_data->len + tag_length;
    output_data = mbedtls_calloc( 1, output_size );
    TEST_ASSERT( output_data != NULL );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_DECRYPT , alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( slot, key_type,
                                 key_data->x,
                                 key_data->len ) == PSA_SUCCESS );

    TEST_ASSERT( psa_aead_decrypt( slot, alg,
                                   nonce->x, nonce->len,
                                   additional_data->x,
                                   additional_data->len,
                                   input_data->x, input_data->len,
                                   output_data, output_size,
                                   &output_length ) == expected_result );

    if( expected_result == PSA_SUCCESS )
    {
        TEST_ASSERT( memcmp( output_data, expected_data->x,
                             output_length ) == 0 );
    }

exit:
    psa_destroy_key( slot );
    mbedtls_free( output_data );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void signature_size( int type_arg,
                     int bits,
                     int alg_arg,
                     int expected_size_arg )
{
    psa_key_type_t type = type_arg;
    psa_algorithm_t alg = alg_arg;
    size_t actual_size = PSA_ASYMMETRIC_SIGN_OUTPUT_SIZE( type, bits, alg );
    TEST_ASSERT( actual_size == (size_t) expected_size_arg );
exit:
    ;
}
/* END_CASE */

/* BEGIN_CASE */
void sign_deterministic( int key_type_arg, data_t *key_data,
                         int alg_arg, data_t *input_data,
                         data_t *output_data )
{
    int slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    size_t key_bits;
    unsigned char *signature = NULL;
    size_t signature_size;
    size_t signature_length = 0xdeadbeef;
    psa_key_policy_t policy;

    TEST_ASSERT( key_data != NULL );
    TEST_ASSERT( input_data != NULL );
    TEST_ASSERT( output_data != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( output_data->len ) );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_SIGN, alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( slot, key_type,
                                 key_data->x,
                                 key_data->len ) == PSA_SUCCESS );
    TEST_ASSERT( psa_get_key_information( slot,
                                          NULL,
                                          &key_bits ) == PSA_SUCCESS );

    /* Allocate a buffer which has the size advertized by the
     * library. */
    signature_size = PSA_ASYMMETRIC_SIGN_OUTPUT_SIZE( key_type,
                                                      key_bits, alg );
    TEST_ASSERT( signature_size != 0 );
    TEST_ASSERT( signature_size <= PSA_ASYMMETRIC_SIGNATURE_MAX_SIZE );
    signature = mbedtls_calloc( 1, signature_size );
    TEST_ASSERT( signature != NULL );

    /* Perform the signature. */
    TEST_ASSERT( psa_asymmetric_sign( slot, alg,
                                      input_data->x, input_data->len,
                                      signature, signature_size,
                                      &signature_length ) == PSA_SUCCESS );
    /* Verify that the signature is what is expected. */
    TEST_ASSERT( signature_length == output_data->len );
    TEST_ASSERT( memcmp( signature, output_data->x,
                         output_data->len ) == 0 );

exit:
    psa_destroy_key( slot );
    mbedtls_free( signature );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void sign_fail( int key_type_arg, data_t *key_data,
                int alg_arg, data_t *input_data,
                int signature_size_arg, int expected_status_arg )
{
    int slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    size_t signature_size = signature_size_arg;
    psa_status_t actual_status;
    psa_status_t expected_status = expected_status_arg;
    unsigned char *signature = NULL;
    size_t signature_length = 0xdeadbeef;
    psa_key_policy_t policy;

    TEST_ASSERT( key_data != NULL );
    TEST_ASSERT( input_data != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input_data->len ) );

    signature = mbedtls_calloc( 1, signature_size );
    TEST_ASSERT( signature != NULL );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_SIGN, alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( slot, key_type,
                                 key_data->x,
                                 key_data->len ) == PSA_SUCCESS );

    actual_status = psa_asymmetric_sign( slot, alg,
                                         input_data->x, input_data->len,
                                         signature, signature_size,
                                         &signature_length );
    TEST_ASSERT( actual_status == expected_status );
    /* The value of *signature_length is unspecified on error, but
     * whatever it is, it should be less than signature_size, so that
     * if the caller tries to read *signature_length bytes without
     * checking the error code then they don't overflow a buffer. */
    TEST_ASSERT( signature_length <= signature_size );

exit:
    psa_destroy_key( slot );
    mbedtls_free( signature );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void sign_verify( int key_type_arg, data_t *key_data,
                  int alg_arg, data_t *input_data )
{
    int slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    size_t key_bits;
    unsigned char *signature = NULL;
    size_t signature_size;
    size_t signature_length = 0xdeadbeef;
    psa_key_policy_t policy;

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy,
                              PSA_KEY_USAGE_SIGN | PSA_KEY_USAGE_VERIFY,
                              alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( slot, key_type,
                                 key_data->x,
                                 key_data->len ) == PSA_SUCCESS );
    TEST_ASSERT( psa_get_key_information( slot,
                                          NULL,
                                          &key_bits ) == PSA_SUCCESS );

    /* Allocate a buffer which has the size advertized by the
     * library. */
    signature_size = PSA_ASYMMETRIC_SIGN_OUTPUT_SIZE( key_type,
                                                      key_bits, alg );
    TEST_ASSERT( signature_size != 0 );
    TEST_ASSERT( signature_size <= PSA_ASYMMETRIC_SIGNATURE_MAX_SIZE );
    signature = mbedtls_calloc( 1, signature_size );
    TEST_ASSERT( signature != NULL );

    /* Perform the signature. */
    TEST_ASSERT( psa_asymmetric_sign( slot, alg,
                                      input_data->x, input_data->len,
                                      signature, signature_size,
                                      &signature_length ) == PSA_SUCCESS );
    /* Check that the signature length looks sensible. */
    TEST_ASSERT( signature_length <= signature_size );
    TEST_ASSERT( signature_length > 0 );

    /* Use the library to verify that the signature is correct. */
    TEST_ASSERT( psa_asymmetric_verify(
                     slot, alg,
                     input_data->x, input_data->len,
                     signature, signature_length ) == PSA_SUCCESS );

    if( input_data->len != 0 )
    {
        /* Flip a bit in the input and verify that the signature is now
         * detected as invalid. Flip a bit at the beginning, not at the end,
         * because ECDSA may ignore the last few bits of the input. */
        input_data->x[0] ^= 1;
        TEST_ASSERT( psa_asymmetric_verify(
                         slot, alg,
                         input_data->x, input_data->len,
                         signature,
                         signature_length ) == PSA_ERROR_INVALID_SIGNATURE );
    }

exit:
    psa_destroy_key( slot );
    mbedtls_free( signature );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void asymmetric_verify( int key_type_arg, data_t *key_data,
                        int alg_arg, data_t *hash_data,
                        data_t *signature_data )
{
    int slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    psa_key_policy_t policy;

    TEST_ASSERT( signature_data->len <= PSA_ASYMMETRIC_SIGNATURE_MAX_SIZE );

    TEST_ASSERT( key_data != NULL );
    TEST_ASSERT( hash_data != NULL );
    TEST_ASSERT( signature_data != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( hash_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( signature_data->len ) );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_VERIFY, alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( slot, key_type,
                                 key_data->x,
                                 key_data->len ) == PSA_SUCCESS );

    TEST_ASSERT( psa_asymmetric_verify( slot, alg,
                                        hash_data->x, hash_data->len,
                                        signature_data->x,
                                        signature_data->len ) == PSA_SUCCESS );
exit:
    psa_destroy_key( slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void asymmetric_verify_fail( int key_type_arg, data_t *key_data,
                             int alg_arg, data_t *hash_data,
                             data_t *signature_data,
                             int expected_status_arg )
{
    int slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    psa_status_t actual_status;
    psa_status_t expected_status = expected_status_arg;
    psa_key_policy_t policy;

    TEST_ASSERT( key_data != NULL );
    TEST_ASSERT( hash_data != NULL );
    TEST_ASSERT( signature_data != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( hash_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( signature_data->len ) );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_VERIFY, alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( slot, key_type,
                                 key_data->x,
                                 key_data->len ) == PSA_SUCCESS );

    actual_status = psa_asymmetric_verify( slot, alg,
                                           hash_data->x, hash_data->len,
                                           signature_data->x,
                                           signature_data->len );

    TEST_ASSERT( actual_status == expected_status );

exit:
    psa_destroy_key( slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void asymmetric_encrypt( int key_type_arg,
                         data_t *key_data,
                         int alg_arg,
                         data_t *input_data,
                         data_t *label,
                         int expected_output_length_arg,
                         int expected_status_arg )
{
    int slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    size_t expected_output_length = expected_output_length_arg;
    size_t key_bits;
    unsigned char *output = NULL;
    size_t output_size;
    size_t output_length = ~0;
    psa_status_t actual_status;
    psa_status_t expected_status = expected_status_arg;
    psa_key_policy_t policy;

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    /* Import the key */
    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_ENCRYPT, alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );
    TEST_ASSERT( psa_import_key( slot, key_type,
                                 key_data->x,
                                 key_data->len ) == PSA_SUCCESS );

    /* Determine the maximum output length */
    TEST_ASSERT( psa_get_key_information( slot,
                                          NULL,
                                          &key_bits ) == PSA_SUCCESS );
    output_size = PSA_ASYMMETRIC_ENCRYPT_OUTPUT_SIZE( key_type, key_bits, alg );
    output = mbedtls_calloc( 1, output_size );
    TEST_ASSERT( output != NULL );

    /* Encrypt the input */
    actual_status = psa_asymmetric_encrypt( slot, alg,
                                            input_data->x, input_data->len,
                                            label->x, label->len,
                                            output, output_size,
                                            &output_length );
    TEST_ASSERT( actual_status == expected_status );
    TEST_ASSERT( output_length == expected_output_length );

    /* If the label is empty, the test framework puts a non-null pointer
     * in label->x. Test that a null pointer works as well. */
    if( label->len == 0 )
    {
        output_length = ~0;
        memset( output, 0, output_size );
        actual_status = psa_asymmetric_encrypt( slot, alg,
                                                input_data->x, input_data->len,
                                                NULL, label->len,
                                                output, output_size,
                                                &output_length );
        TEST_ASSERT( actual_status == expected_status );
        TEST_ASSERT( output_length == expected_output_length );
    }

exit:
    psa_destroy_key( slot );
    mbedtls_free( output );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void asymmetric_encrypt_decrypt( int key_type_arg,
                                 data_t *key_data,
                                 int alg_arg,
                                 data_t *input_data,
                                 data_t *label )
{
    int slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    unsigned char *output = NULL;
    size_t output_size = 0;
    size_t output_length = 0;
    unsigned char *output2 = NULL;
    size_t output2_size = 0;
    size_t output2_length = 0;
    psa_key_policy_t policy;

    TEST_ASSERT( key_data != NULL );
    TEST_ASSERT( input_data != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input_data->len ) );

    output_size = key_data->len;
    output2_size = output_size;
    output = mbedtls_calloc( 1, output_size );
    TEST_ASSERT( output != NULL );
    output2 = mbedtls_calloc( 1, output2_size );
    TEST_ASSERT( output2 != NULL );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy,
                              PSA_KEY_USAGE_ENCRYPT | PSA_KEY_USAGE_DECRYPT,
                              alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( slot, key_type,
                                 key_data->x,
                                 key_data->len ) == PSA_SUCCESS );

    /* We test encryption by checking that encrypt-then-decrypt gives back
     * the original plaintext because of the non-optional random
     * part of encryption process which prevents using fixed vectors. */
    TEST_ASSERT( psa_asymmetric_encrypt( slot, alg,
                                         input_data->x, input_data->len,
                                         label->x, label->len,
                                         output, output_size,
                                         &output_length ) == PSA_SUCCESS );

    TEST_ASSERT( psa_asymmetric_decrypt( slot, alg,
                                         output, output_length,
                                         label->x, label->len,
                                         output2, output2_size,
                                         &output2_length ) == PSA_SUCCESS );
    TEST_ASSERT( memcmp( input_data->x, output2,
                         input_data->len ) == 0 );

exit:
    psa_destroy_key( slot );
    mbedtls_free( output );
    mbedtls_free( output2 );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void asymmetric_decrypt( int key_type_arg,
                         data_t *key_data,
                         int alg_arg,
                         data_t *input_data,
                         data_t *label,
                         data_t *expected_data )
{
    int slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    unsigned char *output = NULL;
    size_t output_size = 0;
    size_t output_length = 0;
    psa_key_policy_t policy;

    TEST_ASSERT( key_data != NULL );
    TEST_ASSERT( input_data != NULL );
    TEST_ASSERT( expected_data != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( expected_data->len ) );

    output_size = key_data->len;
    output = mbedtls_calloc( 1, output_size );
    TEST_ASSERT( output != NULL );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_DECRYPT, alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( slot, key_type,
                                 key_data->x,
                                 key_data->len ) == PSA_SUCCESS );

    TEST_ASSERT( psa_asymmetric_decrypt( slot, alg,
                                         input_data->x, input_data->len,
                                         label->x, label->len,
                                         output,
                                         output_size,
                                         &output_length ) == PSA_SUCCESS );
    TEST_ASSERT( expected_data->len == output_length );
    TEST_ASSERT( memcmp( expected_data->x, output, output_length ) == 0 );

    /* If the label is empty, the test framework puts a non-null pointer
     * in label->x. Test that a null pointer works as well. */
    if( label->len == 0 )
    {
        output_length = ~0;
        memset( output, 0, output_size );
        TEST_ASSERT( psa_asymmetric_decrypt( slot, alg,
                                             input_data->x, input_data->len,
                                             NULL, label->len,
                                             output,
                                             output_size,
                                             &output_length ) == PSA_SUCCESS );
        TEST_ASSERT( expected_data->len == output_length );
        TEST_ASSERT( memcmp( expected_data->x, output, output_length ) == 0 );
    }

exit:
    psa_destroy_key( slot );
    mbedtls_free( output );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void asymmetric_decrypt_fail( int key_type_arg,
                              data_t *key_data,
                              int alg_arg,
                              data_t *input_data,
                              data_t *label,
                              int expected_status_arg  )
{
    int slot = 1;
    psa_key_type_t key_type = key_type_arg;
    psa_algorithm_t alg = alg_arg;
    unsigned char *output = NULL;
    size_t output_size = 0;
    size_t output_length = 0;
    psa_status_t actual_status;
    psa_status_t expected_status = expected_status_arg;
    psa_key_policy_t policy;

    TEST_ASSERT( key_data != NULL );
    TEST_ASSERT( input_data != NULL );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( key_data->len ) );
    TEST_ASSERT( PSA_CRYPTO_TEST_SIZE_T_RANGE( input_data->len ) );

    output_size = key_data->len;
    output = mbedtls_calloc( 1, output_size );
    TEST_ASSERT( output != NULL );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, PSA_KEY_USAGE_DECRYPT, alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );

    TEST_ASSERT( psa_import_key( slot, key_type,
                                 key_data->x,
                                 key_data->len ) == PSA_SUCCESS );

    actual_status = psa_asymmetric_decrypt( slot, alg,
                                            input_data->x, input_data->len,
                                            label->x, label->len,
                                            output, output_size,
                                            &output_length );
    TEST_ASSERT( actual_status == expected_status );

    /* If the label is empty, the test framework puts a non-null pointer
     * in label->x. Test that a null pointer works as well. */
    if( label->len == 0 )
    {
        output_length = ~0;
        memset( output, 0, output_size );
        actual_status = psa_asymmetric_decrypt( slot, alg,
                                                input_data->x, input_data->len,
                                                NULL, label->len,
                                                output, output_size,
                                                &output_length );
        TEST_ASSERT( actual_status == expected_status );
    }

exit:
    psa_destroy_key( slot );
    mbedtls_free( output );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */

/* BEGIN_CASE */
void generate_random( int bytes_arg )
{
    size_t bytes = bytes_arg;
    const unsigned char trail[] = "don't overwrite me";
    unsigned char *output = mbedtls_calloc( 1, bytes + sizeof( trail ) );
    unsigned char *changed = mbedtls_calloc( 1, bytes );
    size_t i;
    unsigned run;

    TEST_ASSERT( output != NULL );
    TEST_ASSERT( changed != NULL );
    memcpy( output + bytes, trail, sizeof( trail ) );

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    /* Run several times, to ensure that every output byte will be
     * nonzero at least once with overwhelming probability
     * (2^(-8*number_of_runs)). */
    for( run = 0; run < 10; run++ )
    {
        memset( output, 0, bytes );
        TEST_ASSERT( psa_generate_random( output, bytes ) == PSA_SUCCESS );

        /* Check that no more than bytes have been overwritten */
        TEST_ASSERT( memcmp( output + bytes, trail, sizeof( trail ) ) == 0 );

        for( i = 0; i < bytes; i++ )
        {
            if( output[i] != 0 )
                ++changed[i];
        }
    }

    /* Check that every byte was changed to nonzero at least once. This
     * validates that psa_generate_random is overwriting every byte of
     * the output buffer. */
    for( i = 0; i < bytes; i++ )
    {
        TEST_ASSERT( changed[i] != 0 );
    }

exit:
    mbedtls_psa_crypto_free( );
    mbedtls_free( output );
    mbedtls_free( changed );
}
/* END_CASE */

/* BEGIN_CASE */
void generate_key( int type_arg,
                   int bits_arg,
                   int usage_arg,
                   int alg_arg,
                   int expected_status_arg )
{
    int slot = 1;
    psa_key_type_t type = type_arg;
    psa_key_usage_t usage = usage_arg;
    size_t bits = bits_arg;
    psa_algorithm_t alg = alg_arg;
    psa_status_t expected_status = expected_status_arg;
    psa_key_type_t got_type;
    size_t got_bits;
    unsigned char exported[616] = {0}; /* enough for a 1024-bit RSA key */
    size_t exported_length;
    psa_status_t expected_export_status =
        usage & PSA_KEY_USAGE_EXPORT ? PSA_SUCCESS : PSA_ERROR_NOT_PERMITTED;
    psa_status_t expected_info_status =
        expected_status == PSA_SUCCESS ? PSA_SUCCESS : PSA_ERROR_EMPTY_SLOT;
    psa_key_policy_t policy;

    TEST_ASSERT( psa_crypto_init( ) == PSA_SUCCESS );

    psa_key_policy_init( &policy );
    psa_key_policy_set_usage( &policy, usage, alg );
    TEST_ASSERT( psa_set_key_policy( slot, &policy ) == PSA_SUCCESS );

    /* Generate a key */
    TEST_ASSERT( psa_generate_key( slot, type, bits,
                                   NULL, 0 ) == expected_status );

    /* Test the key information */
    TEST_ASSERT( psa_get_key_information( slot,
                                          &got_type,
                                          &got_bits ) == expected_info_status );
    if( expected_info_status != PSA_SUCCESS )
        goto exit;
    TEST_ASSERT( got_type == type );
    TEST_ASSERT( got_bits == bits );

    /* Export the key */
    TEST_ASSERT( psa_export_key( slot,
                                 exported, sizeof( exported ),
                                 &exported_length ) == expected_export_status );
    if( expected_export_status == PSA_SUCCESS )
    {
        if( key_type_is_raw_bytes( type ) )
            TEST_ASSERT( exported_length == ( bits + 7 ) / 8 );
#if defined(MBEDTLS_DES_C)
        if( type == PSA_KEY_TYPE_DES )
        {
            /* Check the parity bits. */
            unsigned i;
            for( i = 0; i < bits / 8; i++ )
            {
                unsigned bit_count = 0;
                unsigned m;
                for( m = 1; m <= 0x100; m <<= 1 )
                {
                    if( exported[i] & m )
                        ++bit_count;
                }
                TEST_ASSERT( bit_count % 2 != 0 );
            }
        }
#endif
#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PK_PARSE_C)
        if( type == PSA_KEY_TYPE_RSA_KEYPAIR )
        {
            /* Sanity check: does this look like the beginning of a PKCS#8
             * RSA key pair? Assumes bits is a multiple of 8. */
            size_t n_bytes = bits / 8 + 1;
            size_t n_encoded_bytes;
            unsigned char *n_end;
            TEST_ASSERT( exported_length >= 7 + ( n_bytes + 3 ) * 9 / 2 );
            TEST_ASSERT( exported[0] == 0x30 );
            TEST_ASSERT( exported[1] == 0x82 ); // assumes >=416-bit key
            TEST_ASSERT( exported[4] == 0x02 );
            TEST_ASSERT( exported[5] == 0x01 );
            TEST_ASSERT( exported[6] == 0x00 );
            TEST_ASSERT( exported[7] == 0x02 );
            n_encoded_bytes = exported[8];
            n_end = exported + 9 + n_encoded_bytes;
            if( n_encoded_bytes & 0x80 )
            {
                n_encoded_bytes = ( n_encoded_bytes & 0x7f ) << 7;
                n_encoded_bytes |= exported[9] & 0x7f;
                n_end += 1;
            }
            /* The encoding of n should start with a 0 byte since it should
             * have its high bit set. However Mbed TLS is not compliant and
             * generates an invalid, but widely tolerated, encoding of
             * positive INTEGERs with a bit size that is a multiple of 8
             * with no leading 0 byte. Accept this here. */
            TEST_ASSERT( n_bytes == n_encoded_bytes ||
                         n_bytes == n_encoded_bytes + 1 );
            if( n_bytes == n_encoded_bytes )
                TEST_ASSERT( exported[n_encoded_bytes <= 127 ? 9 : 10] == 0x00 );
            /* Sanity check: e must be 3 */
            TEST_ASSERT( n_end[0] == 0x02 );
            TEST_ASSERT( n_end[1] == 0x03 );
            TEST_ASSERT( n_end[2] == 0x01 );
            TEST_ASSERT( n_end[3] == 0x00 );
            TEST_ASSERT( n_end[4] == 0x01 );
            TEST_ASSERT( n_end[5] == 0x02 );
        }
#endif /* MBEDTLS_RSA_C */
#if defined(MBEDTLS_ECP_C)
        if( PSA_KEY_TYPE_IS_ECC( type ) )
        {
            /* Sanity check: does this look like the beginning of a PKCS#8
             * elliptic curve key pair? */
            TEST_ASSERT( exported_length >= bits * 3 / 8 + 10 );
            TEST_ASSERT( exported[0] == 0x30 );
        }
#endif /* MBEDTLS_ECP_C */
    }

    /* Do something with the key according to its type and permitted usage. */
    if( ! exercise_key( slot, usage, alg ) )
        goto exit;

exit:
    psa_destroy_key( slot );
    mbedtls_psa_crypto_free( );
}
/* END_CASE */