tests/suites/test_suite_rsa.function

/* BEGIN_HEADER */
#include "mbedtls/rsa.h"
#include "rsa_alt_helpers.h"

#include "legacy_or_psa.h"
/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_RSA_C:MBEDTLS_BIGNUM_C:MBEDTLS_GENPRIME
 * END_DEPENDENCIES
 */

/* BEGIN_CASE */
void rsa_invalid_param( )
{
    mbedtls_rsa_context ctx;
    const int invalid_padding = 42;
    const int invalid_hash_id = 0xff;
    const mbedtls_md_type_t md_alg_none = MBEDTLS_MD_NONE;
    unsigned char buf[] = {0x00,0x01,0x02,0x03,0x04,0x05};
    size_t buf_len = sizeof( buf );

    mbedtls_rsa_init( &ctx );

    TEST_EQUAL( mbedtls_rsa_set_padding( &ctx,
                                         invalid_padding,
                                         MBEDTLS_MD_NONE ),
                MBEDTLS_ERR_RSA_INVALID_PADDING );

    TEST_EQUAL( mbedtls_rsa_set_padding( &ctx,
                                         MBEDTLS_RSA_PKCS_V21,
                                         invalid_hash_id ),
                MBEDTLS_ERR_RSA_INVALID_PADDING );

    TEST_EQUAL( mbedtls_rsa_pkcs1_sign(&ctx, NULL,
                                       NULL, MBEDTLS_MD_NONE,
                                       buf_len,
                                       NULL, buf),
                MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

    TEST_EQUAL( mbedtls_rsa_pkcs1_sign(&ctx, NULL,
                                       NULL, MBEDTLS_MD_SHA256,
                                       0,
                                       NULL, buf),
                MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

    TEST_EQUAL( mbedtls_rsa_pkcs1_verify(&ctx, MBEDTLS_MD_NONE,
                                         buf_len,
                                         NULL, buf),
                MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

    TEST_EQUAL( mbedtls_rsa_pkcs1_verify(&ctx, MBEDTLS_MD_SHA256,
                                         0,
                                         NULL, buf),
                MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

#if !defined(MBEDTLS_PKCS1_V15)
    TEST_EQUAL( mbedtls_rsa_set_padding( &ctx,
                                         MBEDTLS_RSA_PKCS_V15,
                                         MBEDTLS_MD_NONE ),
                MBEDTLS_ERR_RSA_INVALID_PADDING );
#endif

#if defined(MBEDTLS_PKCS1_V15)
    TEST_EQUAL( mbedtls_rsa_rsassa_pkcs1_v15_sign(&ctx, NULL,
                                              NULL, MBEDTLS_MD_NONE,
                                              buf_len,
                                              NULL, buf),
                MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

    TEST_EQUAL( mbedtls_rsa_rsassa_pkcs1_v15_sign(&ctx, NULL,
                                              NULL, MBEDTLS_MD_SHA256,
                                              0,
                                              NULL, buf),
                MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

    TEST_EQUAL( mbedtls_rsa_rsassa_pkcs1_v15_verify(&ctx, MBEDTLS_MD_NONE,
                                                buf_len,
                                                NULL, buf),
                MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

    TEST_EQUAL( mbedtls_rsa_rsassa_pkcs1_v15_verify(&ctx, MBEDTLS_MD_SHA256,
                                                0,
                                                NULL, buf),
                MBEDTLS_ERR_RSA_BAD_INPUT_DATA );


#endif

#if !defined(MBEDTLS_PKCS1_V21)
    TEST_EQUAL( mbedtls_rsa_set_padding( &ctx,
                                         MBEDTLS_RSA_PKCS_V21,
                                         MBEDTLS_MD_NONE ),
                MBEDTLS_ERR_RSA_INVALID_PADDING );
#endif

#if defined(MBEDTLS_PKCS1_V21)
    TEST_EQUAL( mbedtls_rsa_rsassa_pss_sign_ext(&ctx, NULL, NULL,
                                    MBEDTLS_MD_NONE, buf_len,
                                    NULL, buf_len,
                                    buf ),
                MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

    TEST_EQUAL( mbedtls_rsa_rsassa_pss_sign_ext(&ctx, NULL, NULL,
                                    MBEDTLS_MD_SHA256, 0,
                                    NULL, buf_len,
                                    buf ),
                MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

    TEST_EQUAL( mbedtls_rsa_rsassa_pss_verify_ext(&ctx, MBEDTLS_MD_NONE,
                                                  buf_len, NULL,
                                                  MBEDTLS_MD_NONE,
                                                  buf_len, buf),
                MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

    TEST_EQUAL( mbedtls_rsa_rsassa_pss_verify_ext(&ctx, MBEDTLS_MD_SHA256,
                                                  0, NULL,
                                                  MBEDTLS_MD_NONE,
                                                  buf_len, buf),
                MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

    TEST_EQUAL( mbedtls_rsa_rsassa_pss_verify(&ctx, MBEDTLS_MD_NONE,
                                              buf_len,
                                              NULL, buf),
                MBEDTLS_ERR_RSA_BAD_INPUT_DATA );

    TEST_EQUAL( mbedtls_rsa_rsassa_pss_verify(&ctx, MBEDTLS_MD_SHA256,
                                              0,
                                              NULL, buf),
                MBEDTLS_ERR_RSA_BAD_INPUT_DATA );
#endif

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

/* BEGIN_CASE */
void rsa_init_free( int reinit )
{
    mbedtls_rsa_context ctx;

    /* Double free is not explicitly documented to work, but we rely on it
     * even inside the library so that you can call mbedtls_rsa_free()
     * unconditionally on an error path without checking whether it has
     * already been called in the success path. */

    mbedtls_rsa_init( &ctx );
    mbedtls_rsa_free( &ctx );

    if( reinit )
        mbedtls_rsa_init( &ctx );
    mbedtls_rsa_free( &ctx );

    /* This test case always succeeds, functionally speaking. A plausible
     * bug might trigger an invalid pointer dereference or a memory leak. */
    goto exit;
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_pkcs1_sign( data_t * message_str, int padding_mode,
                             int digest, int mod, char * input_P,
                             char * input_Q, char * input_N, char * input_E,
                             data_t * result_str, int result )
{
    unsigned char output[256];
    mbedtls_rsa_context ctx;
    mbedtls_mpi N, P, Q, E;
    mbedtls_test_rnd_pseudo_info rnd_info;

    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P );
    mbedtls_mpi_init( &Q ); mbedtls_mpi_init( &E );
    mbedtls_rsa_init( &ctx );
    TEST_ASSERT( mbedtls_rsa_set_padding( &ctx,padding_mode,
                                          MBEDTLS_MD_NONE ) == 0 );

    memset( output, 0x00, sizeof( output ) );
    memset( &rnd_info, 0, sizeof( mbedtls_test_rnd_pseudo_info ) );

    TEST_ASSERT( mbedtls_test_read_mpi( &P, input_P ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &Q, input_Q ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &E, input_E ) == 0 );

    TEST_ASSERT( mbedtls_rsa_import( &ctx, &N, &P, &Q, NULL, &E ) == 0 );
    TEST_ASSERT( mbedtls_rsa_get_len( &ctx ) == (size_t) ( mod / 8 ) );
    TEST_ASSERT( mbedtls_rsa_complete( &ctx ) == 0 );
    TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );

    TEST_ASSERT( mbedtls_rsa_pkcs1_sign(
                     &ctx, &mbedtls_test_rnd_pseudo_rand, &rnd_info,
                     digest, message_str->len, message_str->x,
                     output ) == result );
    if( result == 0 )
    {

        TEST_ASSERT( mbedtls_test_hexcmp( output, result_str->x,
                                          ctx.len, result_str->len ) == 0 );
    }

exit:
    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P );
    mbedtls_mpi_free( &Q ); mbedtls_mpi_free( &E );
    mbedtls_rsa_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_pkcs1_verify( data_t * message_str, int padding_mode,
                               int digest, int mod,
                               char * input_N, char * input_E,
                               data_t * result_str, int result )
{
    mbedtls_rsa_context ctx;
    mbedtls_mpi N, E;

    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &E );
    mbedtls_rsa_init( &ctx );
    TEST_ASSERT( mbedtls_rsa_set_padding( &ctx, padding_mode,
                                          MBEDTLS_MD_NONE ) == 0 );

    TEST_ASSERT( mbedtls_test_read_mpi( &N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &E, input_E ) == 0 );
    TEST_ASSERT( mbedtls_rsa_import( &ctx, &N, NULL, NULL, NULL, &E ) == 0 );
    TEST_ASSERT( mbedtls_rsa_get_len( &ctx ) == (size_t) ( mod / 8 ) );
    TEST_ASSERT( mbedtls_rsa_check_pubkey( &ctx ) == 0 );

    TEST_ASSERT( mbedtls_rsa_pkcs1_verify( &ctx, digest, message_str->len, message_str->x, result_str->x ) == result );

exit:
    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &E );
    mbedtls_rsa_free( &ctx );
}
/* END_CASE */


/* BEGIN_CASE */
void rsa_pkcs1_sign_raw( data_t * hash_result,
                         int padding_mode, int mod,
                         char * input_P, char * input_Q,
                         char * input_N, char * input_E,
                         data_t * result_str )
{
    unsigned char output[256];
    mbedtls_rsa_context ctx;
    mbedtls_mpi N, P, Q, E;
    mbedtls_test_rnd_pseudo_info rnd_info;

    mbedtls_rsa_init( &ctx );
    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P );
    mbedtls_mpi_init( &Q ); mbedtls_mpi_init( &E );

    TEST_ASSERT( mbedtls_rsa_set_padding( &ctx, padding_mode,
                                          MBEDTLS_MD_NONE ) == 0 );

    memset( output, 0x00, sizeof( output ) );
    memset( &rnd_info, 0, sizeof( mbedtls_test_rnd_pseudo_info ) );

    TEST_ASSERT( mbedtls_test_read_mpi( &P, input_P ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &Q, input_Q ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &E, input_E ) == 0 );

    TEST_ASSERT( mbedtls_rsa_import( &ctx, &N, &P, &Q, NULL, &E ) == 0 );
    TEST_ASSERT( mbedtls_rsa_get_len( &ctx ) == (size_t) ( mod / 8 ) );
    TEST_ASSERT( mbedtls_rsa_complete( &ctx ) == 0 );
    TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );


    TEST_ASSERT( mbedtls_rsa_pkcs1_sign( &ctx, &mbedtls_test_rnd_pseudo_rand,
                                         &rnd_info, MBEDTLS_MD_NONE,
                                         hash_result->len,
                                         hash_result->x, output ) == 0 );


    TEST_ASSERT( mbedtls_test_hexcmp( output, result_str->x,
                                      ctx.len, result_str->len ) == 0 );

exit:
    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P );
    mbedtls_mpi_free( &Q ); mbedtls_mpi_free( &E );

    mbedtls_rsa_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE */
void rsa_pkcs1_verify_raw( data_t * hash_result,
                           int padding_mode, int mod,
                           char * input_N, char * input_E,
                           data_t * result_str, int correct )
{
    unsigned char output[256];
    mbedtls_rsa_context ctx;

    mbedtls_mpi N, E;
    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &E );

    mbedtls_rsa_init( &ctx );
    TEST_ASSERT( mbedtls_rsa_set_padding( &ctx, padding_mode,
                                          MBEDTLS_MD_NONE ) == 0 );
    memset( output, 0x00, sizeof( output ) );

    TEST_ASSERT( mbedtls_test_read_mpi( &N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &E, input_E ) == 0 );

    TEST_ASSERT( mbedtls_rsa_import( &ctx, &N, NULL, NULL, NULL, &E ) == 0 );
    TEST_ASSERT( mbedtls_rsa_get_len( &ctx ) == (size_t) ( mod / 8 ) );
    TEST_ASSERT( mbedtls_rsa_check_pubkey( &ctx ) == 0 );


    TEST_ASSERT( mbedtls_rsa_pkcs1_verify( &ctx, MBEDTLS_MD_NONE, hash_result->len, hash_result->x, result_str->x ) == correct );

exit:
    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &E );
    mbedtls_rsa_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_pkcs1_encrypt( data_t * message_str, int padding_mode,
                                int mod, char * input_N, char * input_E,
                                data_t * result_str, int result )
{
    unsigned char output[256];
    mbedtls_rsa_context ctx;
    mbedtls_test_rnd_pseudo_info rnd_info;

    mbedtls_mpi N, E;
    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &E );

    memset( &rnd_info, 0, sizeof( mbedtls_test_rnd_pseudo_info ) );

    mbedtls_rsa_init( &ctx );
    TEST_ASSERT( mbedtls_rsa_set_padding( &ctx, padding_mode,
                                          MBEDTLS_MD_NONE ) == 0 );
    memset( output, 0x00, sizeof( output ) );

    TEST_ASSERT( mbedtls_test_read_mpi( &N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &E, input_E ) == 0 );

    TEST_ASSERT( mbedtls_rsa_import( &ctx, &N, NULL, NULL, NULL, &E ) == 0 );
    TEST_ASSERT( mbedtls_rsa_get_len( &ctx ) == (size_t) ( mod / 8 ) );
    TEST_ASSERT( mbedtls_rsa_check_pubkey( &ctx ) == 0 );


    TEST_ASSERT( mbedtls_rsa_pkcs1_encrypt( &ctx,
                                            &mbedtls_test_rnd_pseudo_rand,
                                            &rnd_info, message_str->len,
                                            message_str->x,
                                            output ) == result );
    if( result == 0 )
    {

        TEST_ASSERT( mbedtls_test_hexcmp( output, result_str->x,
                                          ctx.len, result_str->len ) == 0 );
    }

exit:
    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &E );
    mbedtls_rsa_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE */
void rsa_pkcs1_encrypt_bad_rng( data_t * message_str, int padding_mode,
                                int mod, char * input_N, char * input_E,
                                data_t * result_str, int result )
{
    unsigned char output[256];
    mbedtls_rsa_context ctx;

    mbedtls_mpi N, E;

    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &E );
    mbedtls_rsa_init( &ctx );
    TEST_ASSERT( mbedtls_rsa_set_padding( &ctx, padding_mode,
                                          MBEDTLS_MD_NONE ) == 0 );
    memset( output, 0x00, sizeof( output ) );

    TEST_ASSERT( mbedtls_test_read_mpi( &N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &E, input_E ) == 0 );

    TEST_ASSERT( mbedtls_rsa_import( &ctx, &N, NULL, NULL, NULL, &E ) == 0 );
    TEST_ASSERT( mbedtls_rsa_get_len( &ctx ) == (size_t) ( mod / 8 ) );
    TEST_ASSERT( mbedtls_rsa_check_pubkey( &ctx ) == 0 );


    TEST_ASSERT( mbedtls_rsa_pkcs1_encrypt( &ctx, &mbedtls_test_rnd_zero_rand,
                                            NULL, message_str->len,
                                            message_str->x,
                                            output ) == result );
    if( result == 0 )
    {

        TEST_ASSERT( mbedtls_test_hexcmp( output, result_str->x,
                                          ctx.len, result_str->len ) == 0 );
    }

exit:
    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &E );
    mbedtls_rsa_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_pkcs1_decrypt( data_t * message_str, int padding_mode,
                                int mod, char * input_P,
                                char * input_Q, char * input_N,
                                char * input_E, int max_output,
                                data_t * result_str, int result )
{
    unsigned char output[32];
    mbedtls_rsa_context ctx;
    size_t output_len;
    mbedtls_test_rnd_pseudo_info rnd_info;
    mbedtls_mpi N, P, Q, E;

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

    mbedtls_rsa_init( &ctx );
    TEST_ASSERT( mbedtls_rsa_set_padding( &ctx, padding_mode,
                                          MBEDTLS_MD_NONE ) == 0 );

    memset( output, 0x00, sizeof( output ) );
    memset( &rnd_info, 0, sizeof( mbedtls_test_rnd_pseudo_info ) );


    TEST_ASSERT( mbedtls_test_read_mpi( &P, input_P ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &Q, input_Q ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &E, input_E ) == 0 );

    TEST_ASSERT( mbedtls_rsa_import( &ctx, &N, &P, &Q, NULL, &E ) == 0 );
    TEST_ASSERT( mbedtls_rsa_get_len( &ctx ) == (size_t) ( mod / 8 ) );
    TEST_ASSERT( mbedtls_rsa_complete( &ctx ) == 0 );
    TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );

    output_len = 0;

    TEST_ASSERT( mbedtls_rsa_pkcs1_decrypt( &ctx, mbedtls_test_rnd_pseudo_rand,
                                            &rnd_info,
                                            &output_len, message_str->x, output,
                                            max_output ) == result );
    if( result == 0 )
    {

        TEST_ASSERT( mbedtls_test_hexcmp( output, result_str->x,
                                          output_len,
                                          result_str->len ) == 0 );
    }

exit:
    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P );
    mbedtls_mpi_free( &Q ); mbedtls_mpi_free( &E );
    mbedtls_rsa_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_public( data_t * message_str, int mod,
                         char * input_N, char * input_E,
                         data_t * result_str, int result )
{
    unsigned char output[256];
    mbedtls_rsa_context ctx, ctx2; /* Also test mbedtls_rsa_copy() while at it */

    mbedtls_mpi N, E;

    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &E );
    mbedtls_rsa_init( &ctx );
    mbedtls_rsa_init( &ctx2 );
    memset( output, 0x00, sizeof( output ) );

    TEST_ASSERT( mbedtls_test_read_mpi( &N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &E, input_E ) == 0 );

    TEST_ASSERT( mbedtls_rsa_import( &ctx, &N, NULL, NULL, NULL, &E ) == 0 );

    /* Check test data consistency */
    TEST_ASSERT( message_str->len == (size_t) ( mod / 8 ) );
    TEST_ASSERT( mbedtls_rsa_get_len( &ctx ) == (size_t) ( mod / 8 ) );
    TEST_ASSERT( mbedtls_rsa_check_pubkey( &ctx ) == 0 );

    TEST_ASSERT( mbedtls_rsa_public( &ctx, message_str->x, output ) == result );
    if( result == 0 )
    {

        TEST_ASSERT( mbedtls_test_hexcmp( output, result_str->x,
                                          ctx.len, result_str->len ) == 0 );
    }

    /* And now with the copy */
    TEST_ASSERT( mbedtls_rsa_copy( &ctx2, &ctx ) == 0 );
    /* clear the original to be sure */
    mbedtls_rsa_free( &ctx );

    TEST_ASSERT( mbedtls_rsa_check_pubkey( &ctx2 ) == 0 );

    memset( output, 0x00, sizeof( output ) );
    TEST_ASSERT( mbedtls_rsa_public( &ctx2, message_str->x, output ) == result );
    if( result == 0 )
    {

        TEST_ASSERT( mbedtls_test_hexcmp( output, result_str->x,
                                          ctx.len, result_str->len ) == 0 );
    }

exit:
    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &E );
    mbedtls_rsa_free( &ctx );
    mbedtls_rsa_free( &ctx2 );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_private( data_t * message_str, int mod,
                          char * input_P, char * input_Q,
                          char * input_N, char * input_E,
                          data_t * result_str, int result )
{
    unsigned char output[256];
    mbedtls_rsa_context ctx, ctx2; /* Also test mbedtls_rsa_copy() while at it */
    mbedtls_mpi N, P, Q, E;
    mbedtls_test_rnd_pseudo_info rnd_info;
    int i;

    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P );
    mbedtls_mpi_init( &Q ); mbedtls_mpi_init( &E );
    mbedtls_rsa_init( &ctx );
    mbedtls_rsa_init( &ctx2 );

    memset( &rnd_info, 0, sizeof( mbedtls_test_rnd_pseudo_info ) );

    TEST_ASSERT( mbedtls_test_read_mpi( &P, input_P ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &Q, input_Q ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &E, input_E ) == 0 );

    TEST_ASSERT( mbedtls_rsa_import( &ctx, &N, &P, &Q, NULL, &E ) == 0 );

    /* Check test data consistency */
    TEST_ASSERT( message_str->len == (size_t) ( mod / 8 ) );
    TEST_ASSERT( mbedtls_rsa_get_len( &ctx ) == (size_t) ( mod / 8 ) );
    TEST_ASSERT( mbedtls_rsa_complete( &ctx ) == 0 );
    TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );

    /* repeat three times to test updating of blinding values */
    for( i = 0; i < 3; i++ )
    {
        memset( output, 0x00, sizeof( output ) );
        TEST_ASSERT( mbedtls_rsa_private( &ctx, mbedtls_test_rnd_pseudo_rand,
                                          &rnd_info, message_str->x,
                                          output ) == result );
        if( result == 0 )
        {

            TEST_ASSERT( mbedtls_test_hexcmp( output, result_str->x,
                                              ctx.len,
                                              result_str->len ) == 0 );
        }
    }

    /* And now one more time with the copy */
    TEST_ASSERT( mbedtls_rsa_copy( &ctx2, &ctx ) == 0 );
    /* clear the original to be sure */
    mbedtls_rsa_free( &ctx );

    TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx2 ) == 0 );

    memset( output, 0x00, sizeof( output ) );
    TEST_ASSERT( mbedtls_rsa_private( &ctx2, mbedtls_test_rnd_pseudo_rand,
                                      &rnd_info, message_str->x,
                                      output ) == result );
    if( result == 0 )
    {

        TEST_ASSERT( mbedtls_test_hexcmp( output, result_str->x,
                                          ctx2.len,
                                          result_str->len ) == 0 );
    }

exit:
    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &P );
    mbedtls_mpi_free( &Q ); mbedtls_mpi_free( &E );

    mbedtls_rsa_free( &ctx ); mbedtls_rsa_free( &ctx2 );
}
/* END_CASE */

/* BEGIN_CASE */
void rsa_check_privkey_null(  )
{
    mbedtls_rsa_context ctx;
    memset( &ctx, 0x00, sizeof( mbedtls_rsa_context ) );

    TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == MBEDTLS_ERR_RSA_KEY_CHECK_FAILED );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_check_pubkey( char * input_N, char * input_E, int result )
{
    mbedtls_rsa_context ctx;
    mbedtls_mpi N, E;

    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &E );
    mbedtls_rsa_init( &ctx );

    if( strlen( input_N ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &N, input_N ) == 0 );
    }
    if( strlen( input_E ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &E, input_E ) == 0 );
    }

    TEST_ASSERT( mbedtls_rsa_import( &ctx, &N, NULL, NULL, NULL, &E ) == 0 );
    TEST_ASSERT( mbedtls_rsa_check_pubkey( &ctx ) == result );

exit:
    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &E );
    mbedtls_rsa_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_check_privkey( int mod, char * input_P, char * input_Q,
                                char * input_N, char * input_E, char * input_D,
                                char * input_DP, char * input_DQ, char * input_QP,
                                int result )
{
    mbedtls_rsa_context ctx;

    mbedtls_rsa_init( &ctx );

    ctx.len = mod / 8;
    if( strlen( input_P ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &ctx.P, input_P ) == 0 );
    }
    if( strlen( input_Q ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &ctx.Q, input_Q ) == 0 );
    }
    if( strlen( input_N ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &ctx.N, input_N ) == 0 );
    }
    if( strlen( input_E ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &ctx.E, input_E ) == 0 );
    }
    if( strlen( input_D ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &ctx.D, input_D ) == 0 );
    }
#if !defined(MBEDTLS_RSA_NO_CRT)
    if( strlen( input_DP ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &ctx.DP, input_DP ) == 0 );
    }
    if( strlen( input_DQ ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &ctx.DQ, input_DQ ) == 0 );
    }
    if( strlen( input_QP ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &ctx.QP, input_QP ) == 0 );
    }
#else
    ((void) input_DP);
    ((void) input_DQ);
    ((void) input_QP);
#endif

    TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == result );

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

/* BEGIN_CASE */
void rsa_check_pubpriv( int mod, char * input_Npub, char * input_Epub,
                        char * input_P, char * input_Q, char * input_N,
                        char * input_E, char * input_D, char * input_DP,
                        char * input_DQ, char * input_QP, int result )
{
    mbedtls_rsa_context pub, prv;

    mbedtls_rsa_init( &pub );
    mbedtls_rsa_init( &prv );

    pub.len = mod / 8;
    prv.len = mod / 8;

    if( strlen( input_Npub ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &pub.N, input_Npub ) == 0 );
    }
    if( strlen( input_Epub ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &pub.E, input_Epub ) == 0 );
    }

    if( strlen( input_P ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &prv.P, input_P ) == 0 );
    }
    if( strlen( input_Q ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &prv.Q, input_Q ) == 0 );
    }
    if( strlen( input_N ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &prv.N, input_N ) == 0 );
    }
    if( strlen( input_E ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &prv.E, input_E ) == 0 );
    }
    if( strlen( input_D ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &prv.D, input_D ) == 0 );
    }
#if !defined(MBEDTLS_RSA_NO_CRT)
    if( strlen( input_DP ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &prv.DP, input_DP ) == 0 );
    }
    if( strlen( input_DQ ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &prv.DQ, input_DQ ) == 0 );
    }
    if( strlen( input_QP ) )
    {
        TEST_ASSERT( mbedtls_test_read_mpi( &prv.QP, input_QP ) == 0 );
    }
#else
    ((void) input_DP);
    ((void) input_DQ);
    ((void) input_QP);
#endif

    TEST_ASSERT( mbedtls_rsa_check_pub_priv( &pub, &prv ) == result );

exit:
    mbedtls_rsa_free( &pub );
    mbedtls_rsa_free( &prv );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_gen_key( int nrbits, int exponent, int result)
{
    mbedtls_rsa_context ctx;
    mbedtls_rsa_init ( &ctx );

    /* This test uses an insecure RNG, suitable only for testing.
     * In production, always use a cryptographically strong RNG! */
    TEST_ASSERT( mbedtls_rsa_gen_key( &ctx, mbedtls_test_rnd_std_rand, NULL, nrbits, exponent ) == result );
    if( result == 0 )
    {
        TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );
        TEST_ASSERT( mbedtls_mpi_cmp_mpi( &ctx.P, &ctx.Q ) > 0 );
    }

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

/* BEGIN_CASE */
void mbedtls_rsa_deduce_primes( char *input_N,
                                char *input_D,
                                char *input_E,
                                char *output_P,
                                char *output_Q,
                                int corrupt, int result )
{
    mbedtls_mpi N, P, Pp, Q, Qp, D, E;

    mbedtls_mpi_init( &N );
    mbedtls_mpi_init( &P );  mbedtls_mpi_init( &Q  );
    mbedtls_mpi_init( &Pp ); mbedtls_mpi_init( &Qp );
    mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E );

    TEST_ASSERT( mbedtls_test_read_mpi( &N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &D, input_D ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &E, input_E ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &Qp, output_P ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &Pp, output_Q ) == 0 );

    if( corrupt )
        TEST_ASSERT( mbedtls_mpi_add_int( &D, &D, 2 ) == 0 );

    /* Try to deduce P, Q from N, D, E only. */
    TEST_ASSERT( mbedtls_rsa_deduce_primes( &N, &D, &E, &P, &Q ) == result );

    if( !corrupt )
    {
        /* Check if (P,Q) = (Pp, Qp) or (P,Q) = (Qp, Pp) */
        TEST_ASSERT( ( mbedtls_mpi_cmp_mpi( &P, &Pp ) == 0 && mbedtls_mpi_cmp_mpi( &Q, &Qp ) == 0 ) ||
                     ( mbedtls_mpi_cmp_mpi( &P, &Qp ) == 0 && mbedtls_mpi_cmp_mpi( &Q, &Pp ) == 0 ) );
    }

exit:
    mbedtls_mpi_free( &N );
    mbedtls_mpi_free( &P  ); mbedtls_mpi_free( &Q  );
    mbedtls_mpi_free( &Pp ); mbedtls_mpi_free( &Qp );
    mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_deduce_private_exponent( char *input_P,
                                          char *input_Q,
                                          char *input_E,
                                          char *output_D,
                                          int corrupt, int result )
{
    mbedtls_mpi P, Q, D, Dp, E, R, Rp;

    mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
    mbedtls_mpi_init( &D ); mbedtls_mpi_init( &Dp );
    mbedtls_mpi_init( &E );
    mbedtls_mpi_init( &R ); mbedtls_mpi_init( &Rp );

    TEST_ASSERT( mbedtls_test_read_mpi( &P, input_P ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &Q, input_Q ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &E, input_E ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &Dp, output_D ) == 0 );

    if( corrupt )
    {
        /* Make E even */
        TEST_ASSERT( mbedtls_mpi_set_bit( &E, 0, 0 ) == 0 );
    }

    /* Try to deduce D from N, P, Q, E. */
    TEST_ASSERT( mbedtls_rsa_deduce_private_exponent( &P, &Q,
                                                      &E, &D ) == result );

    if( !corrupt )
    {
        /*
         * Check that D and Dp agree modulo LCM(P-1, Q-1).
         */

        /* Replace P,Q by P-1, Q-1 */
        TEST_ASSERT( mbedtls_mpi_sub_int( &P, &P, 1 ) == 0 );
        TEST_ASSERT( mbedtls_mpi_sub_int( &Q, &Q, 1 ) == 0 );

        /* Check D == Dp modulo P-1 */
        TEST_ASSERT( mbedtls_mpi_mod_mpi( &R,  &D,  &P ) == 0 );
        TEST_ASSERT( mbedtls_mpi_mod_mpi( &Rp, &Dp, &P ) == 0 );
        TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R,  &Rp )     == 0 );

        /* Check D == Dp modulo Q-1 */
        TEST_ASSERT( mbedtls_mpi_mod_mpi( &R,  &D,  &Q ) == 0 );
        TEST_ASSERT( mbedtls_mpi_mod_mpi( &Rp, &Dp, &Q ) == 0 );
        TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R,  &Rp )     == 0 );
    }

exit:

    mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q  );
    mbedtls_mpi_free( &D ); mbedtls_mpi_free( &Dp );
    mbedtls_mpi_free( &E );
    mbedtls_mpi_free( &R ); mbedtls_mpi_free( &Rp );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_import( char *input_N,
                         char *input_P,
                         char *input_Q,
                         char *input_D,
                         char *input_E,
                         int successive,
                         int is_priv,
                         int res_check,
                         int res_complete )
{
    mbedtls_mpi N, P, Q, D, E;
    mbedtls_rsa_context ctx;

    /* Buffers used for encryption-decryption test */
    unsigned char *buf_orig = NULL;
    unsigned char *buf_enc  = NULL;
    unsigned char *buf_dec  = NULL;

    const int have_N = ( strlen( input_N ) > 0 );
    const int have_P = ( strlen( input_P ) > 0 );
    const int have_Q = ( strlen( input_Q ) > 0 );
    const int have_D = ( strlen( input_D ) > 0 );
    const int have_E = ( strlen( input_E ) > 0 );

    mbedtls_rsa_init( &ctx );

    mbedtls_mpi_init( &N );
    mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
    mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E );

    if( have_N )
        TEST_ASSERT( mbedtls_test_read_mpi( &N, input_N ) == 0 );

    if( have_P )
        TEST_ASSERT( mbedtls_test_read_mpi( &P, input_P ) == 0 );

    if( have_Q )
        TEST_ASSERT( mbedtls_test_read_mpi( &Q, input_Q ) == 0 );

    if( have_D )
        TEST_ASSERT( mbedtls_test_read_mpi( &D, input_D ) == 0 );

    if( have_E )
        TEST_ASSERT( mbedtls_test_read_mpi( &E, input_E ) == 0 );

    if( !successive )
    {
        TEST_ASSERT( mbedtls_rsa_import( &ctx,
                             have_N ? &N : NULL,
                             have_P ? &P : NULL,
                             have_Q ? &Q : NULL,
                             have_D ? &D : NULL,
                             have_E ? &E : NULL ) == 0 );
    }
    else
    {
        /* Import N, P, Q, D, E separately.
         * This should make no functional difference. */

        TEST_ASSERT( mbedtls_rsa_import( &ctx,
                               have_N ? &N : NULL,
                               NULL, NULL, NULL, NULL ) == 0 );

        TEST_ASSERT( mbedtls_rsa_import( &ctx,
                               NULL,
                               have_P ? &P : NULL,
                               NULL, NULL, NULL ) == 0 );

        TEST_ASSERT( mbedtls_rsa_import( &ctx,
                               NULL, NULL,
                               have_Q ? &Q : NULL,
                               NULL, NULL ) == 0 );

        TEST_ASSERT( mbedtls_rsa_import( &ctx,
                               NULL, NULL, NULL,
                               have_D ? &D : NULL,
                               NULL ) == 0 );

        TEST_ASSERT( mbedtls_rsa_import( &ctx,
                               NULL, NULL, NULL, NULL,
                               have_E ? &E : NULL ) == 0 );
    }

    TEST_ASSERT( mbedtls_rsa_complete( &ctx ) == res_complete );

    /* On expected success, perform some public and private
     * key operations to check if the key is working properly. */
    if( res_complete == 0 )
    {
        if( is_priv )
            TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == res_check );
        else
            TEST_ASSERT( mbedtls_rsa_check_pubkey( &ctx ) == res_check );

        if( res_check != 0 )
            goto exit;

        buf_orig = mbedtls_calloc( 1, mbedtls_rsa_get_len( &ctx ) );
        buf_enc  = mbedtls_calloc( 1, mbedtls_rsa_get_len( &ctx ) );
        buf_dec  = mbedtls_calloc( 1, mbedtls_rsa_get_len( &ctx ) );
        if( buf_orig == NULL || buf_enc == NULL || buf_dec == NULL )
            goto exit;

        /* This test uses an insecure RNG, suitable only for testing.
         * In production, always use a cryptographically strong RNG! */
        TEST_ASSERT( mbedtls_test_rnd_std_rand( NULL,
                              buf_orig, mbedtls_rsa_get_len( &ctx ) ) == 0 );

        /* Make sure the number we're generating is smaller than the modulus */
        buf_orig[0] = 0x00;

        TEST_ASSERT( mbedtls_rsa_public( &ctx, buf_orig, buf_enc ) == 0 );

        if( is_priv )
        {
            /* This test uses an insecure RNG, suitable only for testing.
             * In production, always use a cryptographically strong RNG! */
            TEST_ASSERT( mbedtls_rsa_private( &ctx, mbedtls_test_rnd_std_rand,
                                              NULL, buf_enc,
                                              buf_dec ) == 0 );

            TEST_ASSERT( memcmp( buf_orig, buf_dec,
                                 mbedtls_rsa_get_len( &ctx ) ) == 0 );
        }
    }

exit:

    mbedtls_free( buf_orig );
    mbedtls_free( buf_enc  );
    mbedtls_free( buf_dec  );

    mbedtls_rsa_free( &ctx );

    mbedtls_mpi_free( &N );
    mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
    mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_export( char *input_N,
                         char *input_P,
                         char *input_Q,
                         char *input_D,
                         char *input_E,
                         int is_priv,
                         int successive )
{
    /* Original MPI's with which we set up the RSA context */
    mbedtls_mpi N, P, Q, D, E;

    /* Exported MPI's */
    mbedtls_mpi Ne, Pe, Qe, De, Ee;

    const int have_N = ( strlen( input_N ) > 0 );
    const int have_P = ( strlen( input_P ) > 0 );
    const int have_Q = ( strlen( input_Q ) > 0 );
    const int have_D = ( strlen( input_D ) > 0 );
    const int have_E = ( strlen( input_E ) > 0 );

    mbedtls_rsa_context ctx;

    mbedtls_rsa_init( &ctx );

    mbedtls_mpi_init( &N );
    mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
    mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E );

    mbedtls_mpi_init( &Ne );
    mbedtls_mpi_init( &Pe ); mbedtls_mpi_init( &Qe );
    mbedtls_mpi_init( &De ); mbedtls_mpi_init( &Ee );

    /* Setup RSA context */

    if( have_N )
        TEST_ASSERT( mbedtls_test_read_mpi( &N, input_N ) == 0 );

    if( have_P )
        TEST_ASSERT( mbedtls_test_read_mpi( &P, input_P ) == 0 );

    if( have_Q )
        TEST_ASSERT( mbedtls_test_read_mpi( &Q, input_Q ) == 0 );

    if( have_D )
        TEST_ASSERT( mbedtls_test_read_mpi( &D, input_D ) == 0 );

    if( have_E )
        TEST_ASSERT( mbedtls_test_read_mpi( &E, input_E ) == 0 );

    TEST_ASSERT( mbedtls_rsa_import( &ctx,
                                     strlen( input_N ) ? &N : NULL,
                                     strlen( input_P ) ? &P : NULL,
                                     strlen( input_Q ) ? &Q : NULL,
                                     strlen( input_D ) ? &D : NULL,
                                     strlen( input_E ) ? &E : NULL ) == 0 );

    TEST_ASSERT( mbedtls_rsa_complete( &ctx ) == 0 );

    /*
     * Export parameters and compare to original ones.
     */

    /* N and E must always be present. */
    if( !successive )
    {
        TEST_ASSERT( mbedtls_rsa_export( &ctx, &Ne, NULL, NULL, NULL, &Ee ) == 0 );
    }
    else
    {
        TEST_ASSERT( mbedtls_rsa_export( &ctx, &Ne, NULL, NULL, NULL, NULL ) == 0 );
        TEST_ASSERT( mbedtls_rsa_export( &ctx, NULL, NULL, NULL, NULL, &Ee ) == 0 );
    }
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &N, &Ne ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &E, &Ee ) == 0 );

    /* If we were providing enough information to setup a complete private context,
     * we expect to be able to export all core parameters. */

    if( is_priv )
    {
        if( !successive )
        {
            TEST_ASSERT( mbedtls_rsa_export( &ctx, NULL, &Pe, &Qe,
                                             &De, NULL ) == 0 );
        }
        else
        {
            TEST_ASSERT( mbedtls_rsa_export( &ctx, NULL, &Pe, NULL,
                                             NULL, NULL ) == 0 );
            TEST_ASSERT( mbedtls_rsa_export( &ctx, NULL, NULL, &Qe,
                                             NULL, NULL ) == 0 );
            TEST_ASSERT( mbedtls_rsa_export( &ctx, NULL, NULL, NULL,
                                             &De, NULL ) == 0 );
        }

        if( have_P )
            TEST_ASSERT( mbedtls_mpi_cmp_mpi( &P, &Pe ) == 0 );

        if( have_Q )
            TEST_ASSERT( mbedtls_mpi_cmp_mpi( &Q, &Qe ) == 0 );

        if( have_D )
            TEST_ASSERT( mbedtls_mpi_cmp_mpi( &D, &De ) == 0 );

        /* While at it, perform a sanity check */
        TEST_ASSERT( mbedtls_rsa_validate_params( &Ne, &Pe, &Qe, &De, &Ee,
                                                       NULL, NULL ) == 0 );
    }

exit:

    mbedtls_rsa_free( &ctx );

    mbedtls_mpi_free( &N );
    mbedtls_mpi_free( &P ); mbedtls_mpi_free( &Q );
    mbedtls_mpi_free( &D ); mbedtls_mpi_free( &E );

    mbedtls_mpi_free( &Ne );
    mbedtls_mpi_free( &Pe ); mbedtls_mpi_free( &Qe );
    mbedtls_mpi_free( &De ); mbedtls_mpi_free( &Ee );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_rsa_validate_params( char *input_N,
                                  char *input_P,
                                  char *input_Q,
                                  char *input_D,
                                  char *input_E,
                                  int prng, int result )
{
    /* Original MPI's with which we set up the RSA context */
    mbedtls_mpi N, P, Q, D, E;

    const int have_N = ( strlen( input_N ) > 0 );
    const int have_P = ( strlen( input_P ) > 0 );
    const int have_Q = ( strlen( input_Q ) > 0 );
    const int have_D = ( strlen( input_D ) > 0 );
    const int have_E = ( strlen( input_E ) > 0 );

    mbedtls_mpi_init( &N );
    mbedtls_mpi_init( &P ); mbedtls_mpi_init( &Q );
    mbedtls_mpi_init( &D ); mbedtls_mpi_init( &E );

    if( have_N )
        TEST_ASSERT( mbedtls_test_read_mpi( &N, input_N ) == 0 );

    if( have_P )
        TEST_ASSERT( mbedtls_test_read_mpi( &P, input_P ) == 0 );

    if( have_Q )
        TEST_ASSERT( mbedtls_test_read_mpi( &Q, input_Q ) == 0 );

    if( have_D )
        TEST_ASSERT( mbedtls_test_read_mpi( &D, input_D ) == 0 );

    if( have_E )
        TEST_ASSERT( mbedtls_test_read_mpi( &E, input_E ) == 0 );

    /* This test uses an insecure RNG, suitable only for testing.
     * In production, always use a cryptographically strong RNG! */
    TEST_ASSERT( mbedtls_rsa_validate_params( have_N ? &N : NULL,
                                        have_P ? &P : NULL,
                                        have_Q ? &Q : NULL,
                                        have_D ? &D : NULL,
                                        have_E ? &E : NULL,
                                        prng ? mbedtls_test_rnd_std_rand : NULL,
                                        prng ? NULL : NULL ) == result );

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

/* BEGIN_CASE */
void mbedtls_rsa_export_raw( data_t *input_N, data_t *input_P,
                             data_t *input_Q, data_t *input_D,
                             data_t *input_E, int is_priv,
                             int successive )
{
    /* Exported buffers */
    unsigned char bufNe[256];
    unsigned char bufPe[128];
    unsigned char bufQe[128];
    unsigned char bufDe[256];
    unsigned char bufEe[1];

    mbedtls_rsa_context ctx;

    mbedtls_rsa_init( &ctx );

    /* Setup RSA context */
    TEST_ASSERT( mbedtls_rsa_import_raw( &ctx,
                               input_N->len ? input_N->x : NULL, input_N->len,
                               input_P->len ? input_P->x : NULL, input_P->len,
                               input_Q->len ? input_Q->x : NULL, input_Q->len,
                               input_D->len ? input_D->x : NULL, input_D->len,
                               input_E->len ? input_E->x : NULL, input_E->len ) == 0 );

    TEST_ASSERT( mbedtls_rsa_complete( &ctx ) == 0 );

    /*
     * Export parameters and compare to original ones.
     */

    /* N and E must always be present. */
    if( !successive )
    {
        TEST_ASSERT( mbedtls_rsa_export_raw( &ctx, bufNe, input_N->len,
                                             NULL, 0, NULL, 0, NULL, 0,
                                             bufEe, input_E->len ) == 0 );
    }
    else
    {
        TEST_ASSERT( mbedtls_rsa_export_raw( &ctx, bufNe, input_N->len,
                                             NULL, 0, NULL, 0, NULL, 0,
                                             NULL, 0 ) == 0 );
        TEST_ASSERT( mbedtls_rsa_export_raw( &ctx, NULL, 0,
                                             NULL, 0, NULL, 0, NULL, 0,
                                             bufEe, input_E->len ) == 0 );
    }
    TEST_ASSERT( memcmp( input_N->x, bufNe, input_N->len ) == 0 );
    TEST_ASSERT( memcmp( input_E->x, bufEe, input_E->len ) == 0 );

    /* If we were providing enough information to setup a complete private context,
     * we expect to be able to export all core parameters. */

    if( is_priv )
    {
        if( !successive )
        {
            TEST_ASSERT( mbedtls_rsa_export_raw( &ctx, NULL, 0,
                                         bufPe, input_P->len ? input_P->len : sizeof( bufPe ),
                                         bufQe, input_Q->len ? input_Q->len : sizeof( bufQe ),
                                         bufDe, input_D->len ? input_D->len : sizeof( bufDe ),
                                         NULL, 0 ) == 0 );
        }
        else
        {
            TEST_ASSERT( mbedtls_rsa_export_raw( &ctx, NULL, 0,
                                         bufPe, input_P->len ? input_P->len : sizeof( bufPe ),
                                         NULL, 0, NULL, 0,
                                         NULL, 0 ) == 0 );

            TEST_ASSERT( mbedtls_rsa_export_raw( &ctx, NULL, 0, NULL, 0,
                                         bufQe, input_Q->len ? input_Q->len : sizeof( bufQe ),
                                         NULL, 0, NULL, 0 ) == 0 );

            TEST_ASSERT( mbedtls_rsa_export_raw( &ctx, NULL, 0, NULL, 0, NULL, 0,
                                         bufDe, input_D->len ? input_D->len : sizeof( bufDe ),
                                         NULL, 0 ) == 0 );
        }

        if( input_P->len )
            TEST_ASSERT( memcmp( input_P->x, bufPe, input_P->len ) == 0 );

        if( input_Q->len )
            TEST_ASSERT( memcmp( input_Q->x, bufQe, input_Q->len ) == 0 );

        if( input_D->len )
            TEST_ASSERT( memcmp( input_D->x, bufDe, input_D->len ) == 0 );

    }

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

/* BEGIN_CASE */
void mbedtls_rsa_import_raw( data_t *input_N,
                             data_t *input_P, data_t *input_Q,
                             data_t *input_D, data_t *input_E,
                             int successive,
                             int is_priv,
                             int res_check,
                             int res_complete )
{
    /* Buffers used for encryption-decryption test */
    unsigned char *buf_orig = NULL;
    unsigned char *buf_enc  = NULL;
    unsigned char *buf_dec  = NULL;

    mbedtls_rsa_context ctx;

    mbedtls_rsa_init( &ctx );

    if( !successive )
    {
        TEST_ASSERT( mbedtls_rsa_import_raw( &ctx,
                               ( input_N->len > 0 ) ? input_N->x : NULL, input_N->len,
                               ( input_P->len > 0 ) ? input_P->x : NULL, input_P->len,
                               ( input_Q->len > 0 ) ? input_Q->x : NULL, input_Q->len,
                               ( input_D->len > 0 ) ? input_D->x : NULL, input_D->len,
                               ( input_E->len > 0 ) ? input_E->x : NULL, input_E->len ) == 0 );
    }
    else
    {
        /* Import N, P, Q, D, E separately.
         * This should make no functional difference. */

        TEST_ASSERT( mbedtls_rsa_import_raw( &ctx,
                               ( input_N->len > 0 ) ? input_N->x : NULL, input_N->len,
                               NULL, 0, NULL, 0, NULL, 0, NULL, 0 ) == 0 );

        TEST_ASSERT( mbedtls_rsa_import_raw( &ctx,
                               NULL, 0,
                               ( input_P->len > 0 ) ? input_P->x : NULL, input_P->len,
                               NULL, 0, NULL, 0, NULL, 0 ) == 0 );

        TEST_ASSERT( mbedtls_rsa_import_raw( &ctx,
                               NULL, 0, NULL, 0,
                               ( input_Q->len > 0 ) ? input_Q->x : NULL, input_Q->len,
                               NULL, 0, NULL, 0 ) == 0 );

        TEST_ASSERT( mbedtls_rsa_import_raw( &ctx,
                               NULL, 0, NULL, 0, NULL, 0,
                               ( input_D->len > 0 ) ? input_D->x : NULL, input_D->len,
                               NULL, 0 ) == 0 );

        TEST_ASSERT( mbedtls_rsa_import_raw( &ctx,
                               NULL, 0, NULL, 0, NULL, 0, NULL, 0,
                               ( input_E->len > 0 ) ? input_E->x : NULL, input_E->len ) == 0 );
    }

    TEST_ASSERT( mbedtls_rsa_complete( &ctx ) == res_complete );

    /* On expected success, perform some public and private
     * key operations to check if the key is working properly. */
    if( res_complete == 0 )
    {
        if( is_priv )
            TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == res_check );
        else
            TEST_ASSERT( mbedtls_rsa_check_pubkey( &ctx ) == res_check );

        if( res_check != 0 )
            goto exit;

        buf_orig = mbedtls_calloc( 1, mbedtls_rsa_get_len( &ctx ) );
        buf_enc  = mbedtls_calloc( 1, mbedtls_rsa_get_len( &ctx ) );
        buf_dec  = mbedtls_calloc( 1, mbedtls_rsa_get_len( &ctx ) );
        if( buf_orig == NULL || buf_enc == NULL || buf_dec == NULL )
            goto exit;

        /* This test uses an insecure RNG, suitable only for testing.
         * In production, always use a cryptographically strong RNG! */
        TEST_ASSERT( mbedtls_test_rnd_std_rand( NULL,
                              buf_orig, mbedtls_rsa_get_len( &ctx ) ) == 0 );

        /* Make sure the number we're generating is smaller than the modulus */
        buf_orig[0] = 0x00;

        TEST_ASSERT( mbedtls_rsa_public( &ctx, buf_orig, buf_enc ) == 0 );

        if( is_priv )
        {
            /* This test uses an insecure RNG, suitable only for testing.
             * In production, always use a cryptographically strong RNG! */
            TEST_ASSERT( mbedtls_rsa_private( &ctx, mbedtls_test_rnd_std_rand,
                                              NULL, buf_enc,
                                              buf_dec ) == 0 );

            TEST_ASSERT( memcmp( buf_orig, buf_dec,
                                 mbedtls_rsa_get_len( &ctx ) ) == 0 );
        }
    }

exit:

    mbedtls_free( buf_orig );
    mbedtls_free( buf_enc  );
    mbedtls_free( buf_dec  );

    mbedtls_rsa_free( &ctx );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_SELF_TEST */
void rsa_selftest(  )
{
    TEST_ASSERT( mbedtls_rsa_self_test( 1 ) == 0 );
}
/* END_CASE */