mbedtls/tests/suites/test_suite_pk.function

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

#include "mbedtls/pk.h"
#include "mbedtls/pk_info.h"

/* For error codes */
#include "mbedtls/ecp.h"
#include "mbedtls/rsa.h"

#include <limits.h>
#include <stdint.h>

static int rnd_std_rand( void *rng_state, unsigned char *output, size_t len );

#define RSA_KEY_SIZE 512
#define RSA_KEY_LEN   64

static int pk_genkey( mbedtls_pk_context *pk )
{
    ((void) pk);

#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_GENPRIME)
    if( mbedtls_pk_get_type( pk ) == MBEDTLS_PK_RSA )
        return mbedtls_rsa_gen_key( mbedtls_pk_rsa( *pk ), rnd_std_rand, NULL, RSA_KEY_SIZE, 3 );
#endif
#if defined(MBEDTLS_ECP_C)
    if( mbedtls_pk_get_type( pk ) == MBEDTLS_PK_ECKEY ||
        mbedtls_pk_get_type( pk ) == MBEDTLS_PK_ECKEY_DH ||
        mbedtls_pk_get_type( pk ) == MBEDTLS_PK_ECDSA )
    {
        int ret;
        if( ( ret = mbedtls_ecp_group_load( &mbedtls_pk_ec( *pk )->grp,
                                      MBEDTLS_ECP_DP_SECP192R1 ) ) != 0 )
            return( ret );

        return mbedtls_ecp_gen_keypair( &mbedtls_pk_ec( *pk )->grp, &mbedtls_pk_ec( *pk )->d,
                                &mbedtls_pk_ec( *pk )->Q, rnd_std_rand, NULL );
    }
#endif
    return( -1 );
}

#if defined(MBEDTLS_RSA_C)

static int mbedtls_rsa_decrypt_func( void *ctx, int mode, size_t *olen,
                       const unsigned char *input, unsigned char *output,
                       size_t output_max_len )
{
    return( mbedtls_rsa_pkcs1_decrypt( (mbedtls_rsa_context *) ctx, NULL, NULL, mode, olen,
                               input, output, output_max_len ) );
}
static int mbedtls_rsa_sign_func( void *ctx,
                   int (*f_rng)(void *, unsigned char *, size_t), void *p_rng,
                   int mode, mbedtls_md_type_t md_alg, unsigned int hashlen,
                   const unsigned char *hash, unsigned char *sig )
{
    return( mbedtls_rsa_pkcs1_sign( (mbedtls_rsa_context *) ctx, f_rng, p_rng, mode,
                            md_alg, hashlen, hash, sig ) );
}
static size_t mbedtls_rsa_key_len_func( void *ctx )
{
    return( ((const mbedtls_rsa_context *) ctx)->len );
}

/* Prepare a raw RSA context with a small random key. */
static void pk_rsa_prepare( mbedtls_rsa_context *raw )
{
    mbedtls_rsa_init( raw, MBEDTLS_RSA_PKCS_V15, MBEDTLS_MD_NONE );
#if defined(MBEDTLS_GENPRIME)
    mbedtls_rsa_gen_key( raw, rnd_std_rand, NULL, RSA_KEY_SIZE, 3 );
#endif
}

/* Test the RSA context tested_ctx by comparing its operation with a
   generic RSA context which is initialized with the key in raw. */
static void pk_rsa_match( mbedtls_rsa_context *raw,
                          mbedtls_pk_context *tested_ctx,
                          int sign_ret, int verify_ret,
                          int encrypt_ret, int decrypt_ret,
                          int debug_ret )
{
    mbedtls_pk_context basic_ctx;
    mbedtls_pk_debug_item dbg_items[10];
    unsigned char hash[50], sig[1000];
    unsigned char msg[50], ciph[1000], test[1000];
    size_t sig_len, ciph_len, test_len;

    memset( hash, 0x2a, sizeof( hash ) );
    memset( sig, 0, sizeof( sig ) );
    memset( msg, 0x2a, sizeof( msg ) );
    memset( ciph, 0, sizeof( ciph ) );
    memset( test, 0, sizeof( test ) );

    /* Initialize basic PK RSA context with raw key */
    mbedtls_pk_init( &basic_ctx );
    TEST_ASSERT( mbedtls_pk_setup( &basic_ctx,
                                   mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == 0 );
    TEST_ASSERT( mbedtls_rsa_copy( mbedtls_pk_rsa( basic_ctx ), raw ) == 0 );

    /* Test administrative functions */
    TEST_ASSERT( mbedtls_pk_can_do( tested_ctx, MBEDTLS_PK_RSA ) );
    TEST_ASSERT( mbedtls_pk_get_bitlen( tested_ctx ) == RSA_KEY_SIZE );
    TEST_ASSERT( mbedtls_pk_get_len( tested_ctx ) == RSA_KEY_LEN );
    TEST_ASSERT( mbedtls_pk_get_signature_size( tested_ctx ) == RSA_KEY_LEN );

    /* Test signature */
    TEST_ASSERT( mbedtls_pk_sign( tested_ctx, MBEDTLS_MD_NONE, hash, sizeof( hash ),
                          sig, &sig_len, rnd_std_rand, NULL ) == sign_ret );
    if( sign_ret == 0 )
    {
#if SIZE_MAX > UINT_MAX
        TEST_ASSERT( mbedtls_pk_sign( tested_ctx, MBEDTLS_MD_NONE, hash, (size_t)-1,
                                      NULL, NULL, rnd_std_rand, NULL ) ==
                     MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#endif /* SIZE_MAX > UINT_MAX */
        TEST_ASSERT( sig_len == RSA_KEY_LEN );
        TEST_ASSERT( mbedtls_pk_verify( &basic_ctx, MBEDTLS_MD_NONE,
                                        hash, sizeof( hash ), sig, sig_len ) == 0 );
    }

    /* Test verification */
    TEST_ASSERT( mbedtls_pk_sign( &basic_ctx, MBEDTLS_MD_NONE, hash, sizeof( hash ),
                          sig, &sig_len, rnd_std_rand, NULL ) == 0 );
    TEST_ASSERT( mbedtls_pk_verify( tested_ctx, MBEDTLS_MD_NONE,
                            hash, sizeof( hash ), sig, sig_len ) == verify_ret );
    if( verify_ret == 0 )
    {
        TEST_ASSERT( mbedtls_pk_verify( tested_ctx, MBEDTLS_MD_NONE,
                                        hash, sizeof( hash ), sig, sig_len - 1 ) == MBEDTLS_ERR_RSA_VERIFY_FAILED );
        sig[sig_len-1] ^= 1;
        TEST_ASSERT( mbedtls_pk_verify( tested_ctx, MBEDTLS_MD_NONE,
                                        hash, sizeof( hash ), sig, sig_len ) == MBEDTLS_ERR_RSA_INVALID_PADDING );
    }

    /* Test encryption */
    TEST_ASSERT( mbedtls_pk_encrypt( tested_ctx, msg, sizeof( msg ),
                             ciph, &ciph_len, sizeof( ciph ),
                             rnd_std_rand, NULL ) == encrypt_ret );
    if( encrypt_ret == 0 )
    {
        TEST_ASSERT( mbedtls_pk_decrypt( &basic_ctx, ciph, ciph_len,
                                         test, &test_len, sizeof( test ),
                                         rnd_std_rand, NULL ) == 0 );
        TEST_ASSERT( test_len == sizeof( msg ) );
        TEST_ASSERT( memcmp( test, msg, test_len ) == 0 );
    }

    /* Test decryption */
    TEST_ASSERT( mbedtls_pk_encrypt( &basic_ctx, msg, sizeof( msg ),
                             ciph, &ciph_len, sizeof( ciph ),
                             rnd_std_rand, NULL ) == 0 );
    TEST_ASSERT( mbedtls_pk_decrypt( tested_ctx, ciph, ciph_len,
                             test, &test_len, sizeof( test ),
                             rnd_std_rand, NULL ) == decrypt_ret );
    if( decrypt_ret == 0 )
    {
        TEST_ASSERT( test_len == sizeof( msg ) );
        TEST_ASSERT( memcmp( test, msg, test_len ) == 0 );
    }

    /* Test debug */
    TEST_ASSERT( mbedtls_pk_debug( tested_ctx, dbg_items ) == debug_ret );

exit:
    mbedtls_pk_free( &basic_ctx );
}

#define OPAQUE_MOCK_CAN_DO MBEDTLS_PK_RSA
#define OPAQUE_MOCK_BITLEN 'b'
#define OPAQUE_MOCK_MD_ALG MBEDTLS_MD_SHA256
#define OPAQUE_MOCK_SIGNATURE_SIZE 4
#define OPAQUE_MOCK_GOOD_SIGNATURE "good"
static const unsigned char opaque_mock_hash[8] = "HASHhash";
static const unsigned char opaque_mock_reference_input[10] = "INPUTinput";
static const unsigned char opaque_mock_reference_encrypted[12] = "C:JOQVUjoqvu";
static const unsigned char opaque_mock_reference_decrypted[12] = "P:HMOTShmots";
static char opaque_mock_fake_ctx = 'c';
static mbedtls_pk_debug_item opaque_mock_pk_debug_item;
static int opaque_mock_debug_called_correctly = 0;
static int opaque_mock_free_called_correctly = 0;

static size_t opaque_mock_get_bitlen( const void *ctx )
{
    TEST_ASSERT( ctx == &opaque_mock_fake_ctx );
    return( OPAQUE_MOCK_BITLEN );
exit:
    return( INT_MIN );
}

static int opaque_mock_can_do( const void *ctx,
                               mbedtls_pk_type_t type )
{
    TEST_ASSERT( ctx == &opaque_mock_fake_ctx );
    return( type == OPAQUE_MOCK_CAN_DO );
exit:
    return( INT_MIN );
}

static int opaque_mock_verify_func( void *ctx, mbedtls_md_type_t md_alg,
                                    const unsigned char *hash, size_t hash_len,
                                    const unsigned char *sig, size_t sig_len )
{
    TEST_ASSERT( ctx == &opaque_mock_fake_ctx );
    TEST_ASSERT( md_alg == OPAQUE_MOCK_MD_ALG );
    TEST_ASSERT( hash_len == sizeof( opaque_mock_hash ) );
    TEST_ASSERT( hash == opaque_mock_hash );
    if( sig_len != OPAQUE_MOCK_SIGNATURE_SIZE )
        return( MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
    if( memcmp( sig, OPAQUE_MOCK_GOOD_SIGNATURE, OPAQUE_MOCK_SIGNATURE_SIZE ) )
        return( MBEDTLS_ERR_PK_INVALID_SIGNATURE );
    return( 0 );
exit:
    return( INT_MIN );
}

static int opaque_mock_sign_func( void *ctx, mbedtls_md_type_t md_alg,
                                  const unsigned char *hash, size_t hash_len,
                                  unsigned char *sig, size_t *sig_len,
                                  int (*f_rng)(void *, unsigned char *, size_t),
                                  void *p_rng )
{
    TEST_ASSERT( ctx == &opaque_mock_fake_ctx );
    TEST_ASSERT( md_alg == OPAQUE_MOCK_MD_ALG );
    TEST_ASSERT( hash_len == sizeof( opaque_mock_hash ) );
    TEST_ASSERT( hash == opaque_mock_hash );
    memcpy( sig, OPAQUE_MOCK_GOOD_SIGNATURE, OPAQUE_MOCK_SIGNATURE_SIZE );
    *sig_len = OPAQUE_MOCK_SIGNATURE_SIZE;
    (void) f_rng;
    (void) p_rng;
    return( 0 );
exit:
    return( INT_MIN );
}

static int opaque_mock_decrypt_func( void *ctx, const unsigned char *input, size_t ilen,
                                     unsigned char *output, size_t *olen, size_t osize,
                                     int (*f_rng)(void *, unsigned char *, size_t),
                                     void *p_rng )
{
    TEST_ASSERT( ctx == &opaque_mock_fake_ctx );
    TEST_ASSERT( ilen == sizeof( opaque_mock_reference_input ) );
    TEST_ASSERT( !memcmp( input, opaque_mock_reference_input,
                          sizeof( opaque_mock_reference_input ) ) );
    if( osize < sizeof( opaque_mock_reference_decrypted ) )
        return( MBEDTLS_ERR_PK_BUFFER_TOO_SMALL );
    *olen = sizeof( opaque_mock_reference_decrypted );
    memcpy( output, opaque_mock_reference_decrypted, sizeof( opaque_mock_reference_decrypted ) );
    (void) f_rng;
    (void) p_rng;
    return( 0 );
exit:
    return( INT_MIN );
}

static int opaque_mock_encrypt_func( void *ctx, const unsigned char *input, size_t ilen,
                                     unsigned char *output, size_t *olen, size_t osize,
                                     int (*f_rng)(void *, unsigned char *, size_t),
                                     void *p_rng )
{
    TEST_ASSERT( ctx == &opaque_mock_fake_ctx );
    TEST_ASSERT( ilen == sizeof( opaque_mock_reference_input ) );
    TEST_ASSERT( !memcmp( input, opaque_mock_reference_input,
                          sizeof( opaque_mock_reference_input ) ) );
    if( osize < sizeof( opaque_mock_reference_encrypted ) )
        return( MBEDTLS_ERR_PK_BUFFER_TOO_SMALL );
    *olen = sizeof( opaque_mock_reference_encrypted );
    memcpy( output, opaque_mock_reference_encrypted, sizeof( opaque_mock_reference_encrypted ) );
    (void) f_rng;
    (void) p_rng;
    return( 0 );
exit:
    return( INT_MIN );
}

static int opaque_mock_check_pair_func( const mbedtls_pk_context *pub,
                                        const mbedtls_pk_context *prv )
{
    TEST_ASSERT( prv->pk_ctx == &opaque_mock_fake_ctx );
    if( mbedtls_pk_get_type( pub ) != MBEDTLS_PK_RSA )
        return( MBEDTLS_ERR_PK_TYPE_MISMATCH );
    return( 0 );
exit:
    return( INT_MIN );
}

static void *opaque_mock_ctx_alloc_func( void )
{
    return( &opaque_mock_fake_ctx );
}
static void *opaque_mock_ctx_alloc_fail( void )
{
    return( NULL );
}

static void opaque_mock_ctx_free_func( void *ctx )
{
    TEST_ASSERT( ctx == &opaque_mock_fake_ctx );
    opaque_mock_free_called_correctly = 1;
exit:
    return;
}

static void opaque_mock_debug_func( const void *ctx,
                                   mbedtls_pk_debug_item *items )
{
    TEST_ASSERT( ctx == &opaque_mock_fake_ctx );
    TEST_ASSERT( items == &opaque_mock_pk_debug_item );
    opaque_mock_debug_called_correctly = 1;
exit:
    return;
}

static size_t opaque_mock_signature_size_func( const void *ctx )
{
    TEST_ASSERT( ctx == &opaque_mock_fake_ctx );
    return( OPAQUE_MOCK_SIGNATURE_SIZE );
exit:
    return( -1 );
}


#endif /* MBEDTLS_RSA_C */

/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_PK_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE */
void pk_utils( int type, int size, int len, char *name )
{
    mbedtls_pk_context pk;

    mbedtls_pk_init( &pk );

    TEST_ASSERT( mbedtls_pk_setup( &pk, mbedtls_pk_info_from_type( type ) ) == 0 );
    TEST_ASSERT( pk_genkey( &pk ) == 0 );

    TEST_ASSERT( (int) mbedtls_pk_get_type( &pk ) == type );
    TEST_ASSERT( mbedtls_pk_can_do( &pk, type ) );
    TEST_ASSERT( mbedtls_pk_get_bitlen( &pk ) == (unsigned) size );
    TEST_ASSERT( mbedtls_pk_get_len( &pk ) == (unsigned) len );
    TEST_ASSERT( strcmp( mbedtls_pk_get_name( &pk), name ) == 0 );

exit:
    mbedtls_pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_PK_PARSE_C:MBEDTLS_FS_IO */
void mbedtls_pk_check_pair( char *pub_file, char *prv_file, int ret )
{
    mbedtls_pk_context pub, prv, alt;

    mbedtls_pk_init( &pub );
    mbedtls_pk_init( &prv );
    mbedtls_pk_init( &alt );

    TEST_ASSERT( mbedtls_pk_parse_public_keyfile( &pub, pub_file ) == 0 );
    TEST_ASSERT( mbedtls_pk_parse_keyfile( &prv, prv_file, NULL ) == 0 );

    TEST_ASSERT( mbedtls_pk_check_pair( &pub, &prv ) == ret );

#if defined(MBEDTLS_RSA_C) && defined(MBEDTLS_PK_RSA_ALT_SUPPORT)
    if( mbedtls_pk_get_type( &prv ) == MBEDTLS_PK_RSA )
    {
        TEST_ASSERT( mbedtls_pk_setup_rsa_alt( &alt, mbedtls_pk_rsa( prv ),
                     mbedtls_rsa_decrypt_func, mbedtls_rsa_sign_func, mbedtls_rsa_key_len_func ) == 0 );
        TEST_ASSERT( mbedtls_pk_check_pair( &pub, &alt ) == ret );
    }
#endif

    mbedtls_pk_free( &pub );
    mbedtls_pk_free( &prv );
    mbedtls_pk_free( &alt );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C */
void pk_rsa_verify_test_vec( char *message_hex_string, int digest,
                       int mod, int radix_N, char *input_N, int radix_E,
                       char *input_E, char *result_hex_str, int result )
{
    unsigned char message_str[1000];
    unsigned char hash_result[1000];
    unsigned char result_str[1000];
    mbedtls_rsa_context *rsa;
    mbedtls_pk_context pk;
    int msg_len;

    mbedtls_pk_init( &pk );

    memset( message_str, 0x00, 1000 );
    memset( hash_result, 0x00, 1000 );
    memset( result_str, 0x00, 1000 );

    TEST_ASSERT( mbedtls_pk_setup( &pk, mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == 0 );
    rsa = mbedtls_pk_rsa( pk );

    rsa->len = mod / 8;
    TEST_ASSERT( mbedtls_mpi_read_string( &rsa->N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &rsa->E, radix_E, input_E ) == 0 );

    msg_len = unhexify( message_str, message_hex_string );
    unhexify( result_str, result_hex_str );

    if( mbedtls_md_info_from_type( digest ) != NULL )
        TEST_ASSERT( mbedtls_md( mbedtls_md_info_from_type( digest ), message_str, msg_len, hash_result ) == 0 );

    TEST_ASSERT( mbedtls_pk_verify( &pk, digest, hash_result, 0,
                            result_str, mbedtls_pk_get_len( &pk ) ) == result );

exit:
    mbedtls_pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C */
void pk_rsa_verify_ext_test_vec( char *message_hex_string, int digest,
                       int mod, int radix_N, char *input_N, int radix_E,
                       char *input_E, char *result_hex_str,
                       int pk_type, int mgf1_hash_id, int salt_len,
                       int result )
{
    unsigned char message_str[1000];
    unsigned char hash_result[1000];
    unsigned char result_str[1000];
    mbedtls_rsa_context *rsa;
    mbedtls_pk_context pk;
    mbedtls_pk_rsassa_pss_options pss_opts;
    void *options;
    int msg_len;
    size_t hash_len;

    mbedtls_pk_init( &pk );

    memset( message_str, 0x00, 1000 );
    memset( hash_result, 0x00, 1000 );
    memset( result_str, 0x00, 1000 );

    TEST_ASSERT( mbedtls_pk_setup( &pk, mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == 0 );
    rsa = mbedtls_pk_rsa( pk );

    rsa->len = mod / 8;
    TEST_ASSERT( mbedtls_mpi_read_string( &rsa->N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &rsa->E, radix_E, input_E ) == 0 );

    msg_len = unhexify( message_str, message_hex_string );
    unhexify( result_str, result_hex_str );

    if( digest != MBEDTLS_MD_NONE )
    {
        TEST_ASSERT( mbedtls_md( mbedtls_md_info_from_type( digest ),
                     message_str, msg_len, hash_result ) == 0 );
        hash_len = 0;
    }
    else
    {
        memcpy( hash_result, message_str, msg_len );
        hash_len = msg_len;
    }

    if( mgf1_hash_id < 0 )
    {
        options = NULL;
    }
    else
    {
        options = &pss_opts;

        pss_opts.mgf1_hash_id = mgf1_hash_id;
        pss_opts.expected_salt_len = salt_len;
    }

    TEST_ASSERT( mbedtls_pk_verify_ext( pk_type, options, &pk,
                                digest, hash_result, hash_len,
                                result_str, mbedtls_pk_get_len( &pk ) ) == result );

exit:
    mbedtls_pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_ECDSA_C */
void pk_ec_test_vec( int type, int id, char *key_str,
                     char *hash_str, char * sig_str, int ret )
{
    mbedtls_pk_context pk;
    mbedtls_ecp_keypair *eckey;
    unsigned char hash[100], sig[500], key[500];
    size_t hash_len, sig_len, key_len;

    mbedtls_pk_init( &pk );

    memset( hash, 0, sizeof( hash ) );  hash_len = unhexify(hash, hash_str);
    memset( sig, 0, sizeof( sig ) );    sig_len = unhexify(sig, sig_str);
    memset( key, 0, sizeof( key ) );    key_len = unhexify(key, key_str);

    TEST_ASSERT( mbedtls_pk_setup( &pk, mbedtls_pk_info_from_type( type ) ) == 0 );

    TEST_ASSERT( mbedtls_pk_can_do( &pk, MBEDTLS_PK_ECDSA ) );
    eckey = mbedtls_pk_ec( pk );

    TEST_ASSERT( mbedtls_ecp_group_load( &eckey->grp, id ) == 0 );
    TEST_ASSERT( mbedtls_ecp_point_read_binary( &eckey->grp, &eckey->Q,
                                        key, key_len ) == 0 );

    TEST_ASSERT( mbedtls_pk_verify( &pk, MBEDTLS_MD_NONE,
                            hash, hash_len, sig, sig_len ) == ret );

exit:
    mbedtls_pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_SHA256_C */
void pk_sign_verify( int type, int sign_ret, int verify_ret )
{
    mbedtls_pk_context pk;
    unsigned char hash[50], sig[5000];
    size_t sig_len;

    mbedtls_pk_init( &pk );

    memset( hash, 0x2a, sizeof( hash ) );
    memset( sig, 0, sizeof( sig ) );

    TEST_ASSERT( mbedtls_pk_setup( &pk, mbedtls_pk_info_from_type( type ) ) == 0 );
    TEST_ASSERT( pk_genkey( &pk ) == 0 );

    TEST_ASSERT( mbedtls_pk_sign( &pk, MBEDTLS_MD_SHA256, hash, sizeof( hash ),
                          sig, &sig_len, rnd_std_rand, NULL ) == sign_ret );
    if( sign_ret == 0 )
        TEST_ASSERT( sig_len <= mbedtls_pk_get_signature_size( &pk ) );

    TEST_ASSERT( mbedtls_pk_verify( &pk, MBEDTLS_MD_SHA256,
                            hash, sizeof( hash ), sig, sig_len ) == verify_ret );

exit:
    mbedtls_pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C */
void pk_rsa_encrypt_test_vec( char *message_hex, int mod,
                            int radix_N, char *input_N,
                            int radix_E, char *input_E,
                            char *result_hex, int ret )
{
    unsigned char message[1000];
    unsigned char output[1000];
    unsigned char result[1000];
    size_t msg_len, olen, res_len;
    rnd_pseudo_info rnd_info;
    mbedtls_rsa_context *rsa;
    mbedtls_pk_context pk;

    memset( &rnd_info,  0, sizeof( rnd_pseudo_info ) );
    memset( message,    0, sizeof( message ) );
    memset( output,     0, sizeof( output ) );
    memset( result,     0, sizeof( result ) );

    msg_len = unhexify( message, message_hex );
    res_len = unhexify( result, result_hex );

    mbedtls_pk_init( &pk );
    TEST_ASSERT( mbedtls_pk_setup( &pk, mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == 0 );
    rsa = mbedtls_pk_rsa( pk );

    rsa->len = mod / 8;
    TEST_ASSERT( mbedtls_mpi_read_string( &rsa->N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &rsa->E, radix_E, input_E ) == 0 );

    TEST_ASSERT( mbedtls_pk_encrypt( &pk, message, msg_len,
                             output, &olen, sizeof( output ),
                             rnd_pseudo_rand, &rnd_info ) == ret );
    TEST_ASSERT( olen == res_len );
    TEST_ASSERT( memcmp( output, result, olen ) == 0 );

exit:
    mbedtls_pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C */
void pk_rsa_decrypt_test_vec( char *cipher_hex, int mod,
                            int radix_P, char *input_P,
                            int radix_Q, char *input_Q,
                            int radix_N, char *input_N,
                            int radix_E, char *input_E,
                            char *clear_hex, int ret )
{
    unsigned char clear[1000];
    unsigned char output[1000];
    unsigned char cipher[1000];
    size_t clear_len, olen, cipher_len;
    rnd_pseudo_info rnd_info;
    mbedtls_mpi N, P, Q, E;
    mbedtls_rsa_context *rsa;
    mbedtls_pk_context pk;

    mbedtls_pk_init( &pk );
    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P );
    mbedtls_mpi_init( &Q ); mbedtls_mpi_init( &E );

    memset( &rnd_info,  0, sizeof( rnd_pseudo_info ) );
    memset( clear,      0, sizeof( clear ) );
    memset( cipher,     0, sizeof( cipher ) );

    clear_len  = unhexify( clear,   clear_hex );
    cipher_len = unhexify( cipher, cipher_hex );

    /* init pk-rsa context */
    TEST_ASSERT( mbedtls_pk_setup( &pk, mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == 0 );
    rsa = mbedtls_pk_rsa( pk );

    /* load public key */
    TEST_ASSERT( mbedtls_mpi_read_string( &N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_E, input_E ) == 0 );

    /* load private key */
    TEST_ASSERT( mbedtls_mpi_read_string( &P, radix_P, input_P ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &Q, radix_Q, input_Q ) == 0 );
    TEST_ASSERT( mbedtls_rsa_import( rsa, &N, &P, &Q, NULL, &E ) == 0 );
    TEST_ASSERT( mbedtls_rsa_get_len( rsa ) == (size_t) ( mod / 8 ) );
    TEST_ASSERT( mbedtls_rsa_complete( rsa ) == 0 );

    /* decryption test */
    memset( output, 0, sizeof( output ) );
    olen = 0;
    TEST_ASSERT( mbedtls_pk_decrypt( &pk, cipher, cipher_len,
                             output, &olen, sizeof( output ),
                             rnd_pseudo_rand, &rnd_info ) == ret );
    if( ret == 0 )
    {
        TEST_ASSERT( olen == clear_len );
        TEST_ASSERT( memcmp( output, clear, olen ) == 0 );
    }

exit:
    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P );
    mbedtls_mpi_free( &Q ); mbedtls_mpi_free( &E );
    mbedtls_pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE */
void pk_ec_nocrypt( int type )
{
    mbedtls_pk_context pk;
    unsigned char output[100];
    unsigned char input[100];
    rnd_pseudo_info rnd_info;
    size_t olen = 0;
    int ret = MBEDTLS_ERR_PK_TYPE_MISMATCH;

    mbedtls_pk_init( &pk );

    memset( &rnd_info,  0, sizeof( rnd_pseudo_info ) );
    memset( output,     0, sizeof( output ) );
    memset( input,      0, sizeof( input ) );

    TEST_ASSERT( mbedtls_pk_setup( &pk, mbedtls_pk_info_from_type( type ) ) == 0 );

    TEST_ASSERT( mbedtls_pk_encrypt( &pk, input, sizeof( input ),
                             output, &olen, sizeof( output ),
                             rnd_pseudo_rand, &rnd_info ) == ret );

    TEST_ASSERT( mbedtls_pk_decrypt( &pk, input, sizeof( input ),
                             output, &olen, sizeof( output ),
                             rnd_pseudo_rand, &rnd_info ) == ret );

exit:
    mbedtls_pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C */
void pk_rsa_overflow( )
{
    mbedtls_pk_context pk;
    size_t hash_len = SIZE_MAX;

    if( SIZE_MAX <= UINT_MAX )
        return;

    mbedtls_pk_init( &pk );

    TEST_ASSERT( mbedtls_pk_setup( &pk,
                 mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == 0 );

#if defined(MBEDTLS_PKCS1_V21)
    TEST_ASSERT( mbedtls_pk_verify_ext( MBEDTLS_PK_RSASSA_PSS, NULL, &pk,
                    MBEDTLS_MD_NONE, NULL, hash_len, NULL, 0 ) ==
                 MBEDTLS_ERR_PK_BAD_INPUT_DATA );
#endif /* MBEDTLS_PKCS1_V21 */

    TEST_ASSERT( mbedtls_pk_verify( &pk, MBEDTLS_MD_NONE, NULL, hash_len,
                    NULL, 0 ) == MBEDTLS_ERR_PK_BAD_INPUT_DATA );

    TEST_ASSERT( mbedtls_pk_sign( &pk, MBEDTLS_MD_NONE, NULL, hash_len, NULL, 0,
                    rnd_std_rand, NULL ) == MBEDTLS_ERR_PK_BAD_INPUT_DATA );

exit:
    mbedtls_pk_free( &pk );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C:MBEDTLS_PK_RSA_ALT_SUPPORT */
void pk_rsa_alt( )
{
    /*
     * An rsa_alt context can only do private operations (decrypt, sign).
     * Test it against the public operations (encrypt, verify) of a
     * corresponding rsa context.
     */
    mbedtls_pk_context alt;
    mbedtls_rsa_context raw;

    /* Generate an RSA key to use in both contexts */
    pk_rsa_prepare( &raw );

    /* Set up the alt context with the generated key */
    mbedtls_pk_init( &alt );
    TEST_ASSERT( mbedtls_pk_setup_rsa_alt( &alt, (void *) &raw,
                                           mbedtls_rsa_decrypt_func,
                                           mbedtls_rsa_sign_func,
                                           mbedtls_rsa_key_len_func ) == 0 );

    /* Check the metadata in the alt context */
    TEST_ASSERT( mbedtls_pk_get_type( &alt ) == MBEDTLS_PK_RSA_ALT );
    TEST_ASSERT( strcmp( mbedtls_pk_get_name( &alt ), "RSA-alt" ) == 0 );

    /* Exercise the alt context */
    pk_rsa_match( &raw, &alt,
                  0, MBEDTLS_ERR_PK_TYPE_MISMATCH,
                  MBEDTLS_ERR_PK_TYPE_MISMATCH, 0,
                  MBEDTLS_ERR_PK_TYPE_MISMATCH );

exit:
    mbedtls_rsa_free( &raw );
    mbedtls_pk_free( &alt );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C:MBEDTLS_ECDSA_C */
void pk_opaque_mock( )
{
    mbedtls_pk_info_t info =
        MBEDTLS_PK_OPAQUE_INFO_1(
            "mock"
            , opaque_mock_get_bitlen
            , opaque_mock_can_do
            , opaque_mock_signature_size_func
            , opaque_mock_verify_func
            , opaque_mock_sign_func
            , opaque_mock_decrypt_func
            , opaque_mock_encrypt_func
            , opaque_mock_check_pair_func
            , opaque_mock_ctx_alloc_func
            , opaque_mock_ctx_free_func
            , opaque_mock_debug_func
            );
    mbedtls_pk_context ctx;
    unsigned char sig[OPAQUE_MOCK_SIGNATURE_SIZE] = OPAQUE_MOCK_GOOD_SIGNATURE;
    unsigned char input[sizeof( opaque_mock_reference_input )];
    unsigned char output[sizeof( opaque_mock_reference_decrypted )] = "garbage";
    size_t len;

    mbedtls_pk_init( &ctx );
    TEST_ASSERT( mbedtls_pk_setup( &ctx, &info ) == 0 );

    TEST_ASSERT( mbedtls_pk_get_type( &ctx ) == MBEDTLS_PK_OPAQUE );
    TEST_ASSERT( mbedtls_pk_get_name( &ctx ) == info.name );
    TEST_ASSERT( mbedtls_pk_get_bitlen( &ctx ) == OPAQUE_MOCK_BITLEN );
    TEST_ASSERT( mbedtls_pk_can_do( &ctx, OPAQUE_MOCK_CAN_DO ) == 1 );
    TEST_ASSERT( mbedtls_pk_can_do( &ctx, OPAQUE_MOCK_CAN_DO ^ 1 ) == 0 );
    TEST_ASSERT( mbedtls_pk_get_signature_size( &ctx ) == OPAQUE_MOCK_SIGNATURE_SIZE );

    TEST_ASSERT( mbedtls_pk_verify( &ctx, OPAQUE_MOCK_MD_ALG,
                                    opaque_mock_hash, sizeof( opaque_mock_hash ),
                                    sig, OPAQUE_MOCK_SIGNATURE_SIZE ) == 0 );
    TEST_ASSERT( mbedtls_pk_verify( &ctx, OPAQUE_MOCK_MD_ALG,
                                    opaque_mock_hash, sizeof( opaque_mock_hash ),
                                    sig, OPAQUE_MOCK_SIGNATURE_SIZE - 1 ) ==
                 MBEDTLS_ERR_PK_SIG_LEN_MISMATCH );
    sig[0] ^= 1;
    TEST_ASSERT( mbedtls_pk_verify( &ctx, OPAQUE_MOCK_MD_ALG,
                                    opaque_mock_hash, sizeof( opaque_mock_hash ),
                                    sig, OPAQUE_MOCK_SIGNATURE_SIZE ) ==
                 MBEDTLS_ERR_PK_INVALID_SIGNATURE );
    len = -42;
    TEST_ASSERT( mbedtls_pk_sign( &ctx, OPAQUE_MOCK_MD_ALG,
                                  opaque_mock_hash, sizeof( opaque_mock_hash ),
                                  sig, &len, NULL, NULL ) == 0 );
    TEST_ASSERT( len == OPAQUE_MOCK_SIGNATURE_SIZE );

    memcpy( input, opaque_mock_reference_input,
            sizeof( opaque_mock_reference_input ) );
    len = -42;
    TEST_ASSERT( mbedtls_pk_encrypt( &ctx, input, sizeof( input ),
                                     output, &len,
                                     sizeof( opaque_mock_reference_encrypted ),
                                     NULL, NULL ) == 0);
    TEST_ASSERT( memcmp( input, opaque_mock_reference_input,
                         sizeof( opaque_mock_reference_input ) ) == 0 );
    TEST_ASSERT( len == sizeof( opaque_mock_reference_encrypted ) );
    TEST_ASSERT( memcmp( output, opaque_mock_reference_encrypted,
                         sizeof( opaque_mock_reference_encrypted ) ) == 0 );
    len = -42;
    TEST_ASSERT( mbedtls_pk_decrypt( &ctx, input, sizeof( input ),
                                     output, &len,
                                     sizeof( opaque_mock_reference_decrypted ),
                                     NULL, NULL ) == 0);
    TEST_ASSERT( memcmp( input, opaque_mock_reference_input,
                         sizeof( opaque_mock_reference_input ) ) == 0 );
    TEST_ASSERT( len == sizeof( opaque_mock_reference_decrypted ) );
    TEST_ASSERT( memcmp( output, opaque_mock_reference_decrypted,
                         sizeof( opaque_mock_reference_decrypted ) ) == 0 );

    TEST_ASSERT( mbedtls_pk_check_pair( NULL, &ctx ) ==
                 MBEDTLS_ERR_PK_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_pk_check_pair( &ctx, &ctx ) == 0 );
    {
        mbedtls_pk_context pub;
        mbedtls_pk_init( &pub );
        TEST_ASSERT( mbedtls_pk_check_pair( &pub, &ctx ) ==
                     MBEDTLS_ERR_PK_BAD_INPUT_DATA );

        TEST_ASSERT( mbedtls_pk_setup( &pub,
                     mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == 0 );
        TEST_ASSERT( mbedtls_pk_check_pair( &pub, &ctx ) == 0 );
        mbedtls_pk_free( &pub );

        TEST_ASSERT( mbedtls_pk_setup( &pub,
                     mbedtls_pk_info_from_type( MBEDTLS_PK_ECDSA ) ) == 0 );
        TEST_ASSERT( mbedtls_pk_check_pair( &pub, &ctx ) ==
                     MBEDTLS_ERR_PK_TYPE_MISMATCH );
        mbedtls_pk_free( &pub );
}

    opaque_mock_debug_called_correctly = 0;
    TEST_ASSERT( mbedtls_pk_debug( &ctx, &opaque_mock_pk_debug_item ) == 0 );
    TEST_ASSERT( opaque_mock_debug_called_correctly );

    opaque_mock_free_called_correctly = 0;
    mbedtls_pk_free( &ctx );
    TEST_ASSERT( opaque_mock_free_called_correctly );
    return;

exit:
    mbedtls_pk_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C */
void pk_opaque_minimal( )
{
    mbedtls_pk_info_t info =
        MBEDTLS_PK_OPAQUE_INFO_1(
            "mock"
            , opaque_mock_get_bitlen
            , opaque_mock_can_do
            , NULL
            , NULL
            , NULL
            , NULL
            , NULL
            , NULL
            , NULL
            , opaque_mock_ctx_free_func
            , NULL
            );
    mbedtls_pk_context ctx;

    mbedtls_pk_init( &ctx );
    TEST_ASSERT( mbedtls_pk_setup( &ctx, &info ) == 0 );
    ctx.pk_ctx = &opaque_mock_fake_ctx;

    TEST_ASSERT( mbedtls_pk_get_type( &ctx ) == MBEDTLS_PK_OPAQUE );
    TEST_ASSERT( mbedtls_pk_get_name( &ctx ) == info.name );
    TEST_ASSERT( mbedtls_pk_get_bitlen( &ctx ) == OPAQUE_MOCK_BITLEN );
    TEST_ASSERT( mbedtls_pk_can_do( &ctx, OPAQUE_MOCK_CAN_DO ) == 1 );
    TEST_ASSERT( mbedtls_pk_can_do( &ctx, OPAQUE_MOCK_CAN_DO ^ 1 ) == 0 );
    TEST_ASSERT( mbedtls_pk_get_signature_size( &ctx ) == 0 );

    TEST_ASSERT( mbedtls_pk_verify( &ctx, OPAQUE_MOCK_MD_ALG,
                                    NULL, 0, NULL, 0 ) ==
                 MBEDTLS_ERR_PK_TYPE_MISMATCH );
    TEST_ASSERT( mbedtls_pk_sign( &ctx, OPAQUE_MOCK_MD_ALG, NULL, 0,
                                  NULL, NULL, NULL, NULL ) ==
                 MBEDTLS_ERR_PK_TYPE_MISMATCH );
    TEST_ASSERT( mbedtls_pk_encrypt( &ctx, NULL, 0,
                                     NULL, NULL, 0, NULL, NULL ) ==
                 MBEDTLS_ERR_PK_TYPE_MISMATCH);
    TEST_ASSERT( mbedtls_pk_decrypt( &ctx, NULL, 0,
                                     NULL, NULL, 0, NULL, NULL ) ==
                 MBEDTLS_ERR_PK_TYPE_MISMATCH);

    TEST_ASSERT( mbedtls_pk_check_pair( NULL, &ctx ) ==
                 MBEDTLS_ERR_PK_BAD_INPUT_DATA );
    TEST_ASSERT( mbedtls_pk_check_pair( &ctx, &ctx ) == 0 );
    {
        mbedtls_pk_context pub;
        mbedtls_pk_init( &pub );
        TEST_ASSERT( mbedtls_pk_setup( &pub,
                     mbedtls_pk_info_from_type( MBEDTLS_PK_RSA ) ) == 0 );
        TEST_ASSERT( mbedtls_pk_check_pair( &pub, &ctx ) ==
                     MBEDTLS_ERR_PK_FEATURE_UNAVAILABLE );
        mbedtls_pk_free( &pub );
}

    TEST_ASSERT( mbedtls_pk_debug( &ctx, &opaque_mock_pk_debug_item ) ==
                 MBEDTLS_ERR_PK_TYPE_MISMATCH );

    opaque_mock_free_called_correctly = 0;
    mbedtls_pk_free( &ctx );
    TEST_ASSERT( opaque_mock_free_called_correctly );
    return;

exit:
    mbedtls_pk_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C */
void pk_opaque_fail_allocation( )
{
    mbedtls_pk_info_t info =
        MBEDTLS_PK_OPAQUE_INFO_1(
            "mock"
            , opaque_mock_get_bitlen
            , opaque_mock_can_do
            , NULL
            , NULL
            , NULL
            , NULL
            , NULL
            , NULL
            , opaque_mock_ctx_alloc_fail
            , NULL
            , NULL
            );
    mbedtls_pk_context ctx;
    mbedtls_pk_init( &ctx );
    TEST_ASSERT( mbedtls_pk_setup( &ctx, &info ) ==
                 MBEDTLS_ERR_PK_ALLOC_FAILED );
    TEST_ASSERT( ctx.pk_info == NULL );
    TEST_ASSERT( ctx.pk_ctx == NULL );
exit:
    mbedtls_pk_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_RSA_C:MBEDTLS_PK_RSA_ALT_SUPPORT */
void pk_opaque_wrapper( )
{
    /* Test an opaque context that's a wrapper around the usual RSA
       implementation against an independent raw RSA context. */
    mbedtls_pk_context opaque;
    mbedtls_rsa_context raw;
    const mbedtls_pk_info_t *mbedtls_rsa_info =
        mbedtls_pk_info_from_type( MBEDTLS_PK_RSA );
    mbedtls_pk_info_t pk_rsa_opaque_info =
        MBEDTLS_PK_OPAQUE_INFO_1(
            "RSA-opaque-wrapper"
            , mbedtls_rsa_info->get_bitlen
            , mbedtls_rsa_info->can_do
            , mbedtls_rsa_info->signature_size_func
            , mbedtls_rsa_info->verify_func
            , mbedtls_rsa_info->sign_func
            , mbedtls_rsa_info->decrypt_func
            , mbedtls_rsa_info->encrypt_func
            , NULL // we don't test check_pair here
            , mbedtls_rsa_info->ctx_alloc_func
            , mbedtls_rsa_info->ctx_free_func
            , mbedtls_rsa_info->debug_func
            );

    /* Generate an RSA key to use in both contexts */
    pk_rsa_prepare( &raw );

    /* Set up the opaque context with the generated key */
    mbedtls_pk_init( &opaque );
    TEST_ASSERT( mbedtls_pk_setup( &opaque, &pk_rsa_opaque_info ) == 0 );
    mbedtls_rsa_copy( opaque.pk_ctx, &raw );

    /* Check the metadata in the opaque context */
    TEST_ASSERT( mbedtls_pk_get_type( &opaque ) == MBEDTLS_PK_OPAQUE );
    TEST_ASSERT( strcmp( mbedtls_pk_get_name( &opaque ),
                         "RSA-opaque-wrapper" ) == 0 );

    /* Exercise the opaque context */
    pk_rsa_match( &raw, &opaque, 0, 0, 0, 0, 0 );

exit:
    mbedtls_rsa_free( &raw );
    mbedtls_pk_free( &opaque );
}
/* END_CASE */