tests/suites/test_suite_rsa.function

/* BEGIN_HEADER */
#include "mbedtls/rsa.h"
#include "mbedtls/md2.h"
#include "mbedtls/md4.h"
#include "mbedtls/md5.h"
#include "mbedtls/sha1.h"
#include "mbedtls/sha256.h"
#include "mbedtls/sha512.h"
#include "mbedtls/entropy.h"
#include "mbedtls/ctr_drbg.h"
/* END_HEADER */

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

/* BEGIN_CASE */
void mbedtls_rsa_pkcs1_sign( char *message_hex_string, int padding_mode, int digest,
                     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 *result_hex_str, int result )
{
    unsigned char message_str[1000];
    unsigned char hash_result[1000];
    unsigned char output[1000];
    unsigned char output_str[1000];
    mbedtls_rsa_context ctx;
    mbedtls_mpi N, P, Q, E;
    int msg_len;
    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, padding_mode, 0 );

    memset( message_str, 0x00, 1000 );
    memset( hash_result, 0x00, 1000 );
    memset( output, 0x00, 1000 );
    memset( output_str, 0x00, 1000 );
    memset( &rnd_info, 0, sizeof( rnd_pseudo_info ) );

    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_mpi_read_string( &N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_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, NULL, NULL ) == 0 );
    TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );

    msg_len = unhexify( message_str, message_hex_string );

    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_rsa_pkcs1_sign( &ctx, &rnd_pseudo_rand, &rnd_info,
                                         MBEDTLS_RSA_PRIVATE, digest, 0,
                                         hash_result, output ) == result );
    if( result == 0 )
    {
        hexify( output_str, output, ctx.len );

        TEST_ASSERT( strcasecmp( (char *) output_str, result_hex_str ) == 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( char *message_hex_string, int padding_mode, 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 ctx;
    int msg_len;

    mbedtls_mpi N, E;

    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &E );
    mbedtls_rsa_init( &ctx, padding_mode, 0 );
    memset( message_str, 0x00, 1000 );
    memset( hash_result, 0x00, 1000 );
    memset( result_str, 0x00, 1000 );

    TEST_ASSERT( mbedtls_mpi_read_string( &N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_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 );

    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_rsa_pkcs1_verify( &ctx, NULL, NULL, MBEDTLS_RSA_PUBLIC, digest, 0, hash_result, result_str ) == result );

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


/* BEGIN_CASE */
void rsa_pkcs1_sign_raw( char *message_hex_string, char *hash_result_string,
                         int padding_mode, 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 *result_hex_str )
{
    unsigned char message_str[1000];
    unsigned char hash_result[1000];
    unsigned char output[1000];
    unsigned char output_str[1000];
    mbedtls_rsa_context ctx;
    mbedtls_mpi N, P, Q, E;
    int hash_len;
    rnd_pseudo_info rnd_info;

    mbedtls_rsa_init( &ctx, padding_mode, 0 );
    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &P );
    mbedtls_mpi_init( &Q ); mbedtls_mpi_init( &E );

    memset( message_str, 0x00, 1000 );
    memset( hash_result, 0x00, 1000 );
    memset( output, 0x00, 1000 );
    memset( output_str, 0x00, 1000 );
    memset( &rnd_info, 0, sizeof( rnd_pseudo_info ) );

    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_mpi_read_string( &N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_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, NULL, NULL ) == 0 );
    TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );

    unhexify( message_str, message_hex_string );
    hash_len = unhexify( hash_result, hash_result_string );

    TEST_ASSERT( mbedtls_rsa_pkcs1_sign( &ctx, &rnd_pseudo_rand, &rnd_info,
                                         MBEDTLS_RSA_PRIVATE, MBEDTLS_MD_NONE,
                                         hash_len, hash_result, output ) == 0 );

    hexify( output_str, output, ctx.len );

    TEST_ASSERT( strcasecmp( (char *) output_str, result_hex_str ) == 0 );

    /* For PKCS#1 v1.5, there is an alternative way to generate signatures */
    if( padding_mode == MBEDTLS_RSA_PKCS_V15 )
    {
        memset( output, 0x00, 1000 );
        memset( output_str, 0x00, 1000 );

        TEST_ASSERT( mbedtls_rsa_rsaes_pkcs1_v15_encrypt( &ctx,
                    &rnd_pseudo_rand, &rnd_info, MBEDTLS_RSA_PRIVATE,
                    hash_len, hash_result, output ) == 0 );

        hexify( output_str, output, ctx.len );

        TEST_ASSERT( strcasecmp( (char *) output_str, result_hex_str ) == 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( char *message_hex_string, char *hash_result_string,
                           int padding_mode, int mod, int radix_N,
                           char *input_N, int radix_E, char *input_E,
                           char *result_hex_str, int correct )
{
    unsigned char message_str[1000];
    unsigned char hash_result[1000];
    unsigned char result_str[1000];
    unsigned char output[1000];
    mbedtls_rsa_context ctx;
    size_t hash_len, olen;

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

    mbedtls_rsa_init( &ctx, padding_mode, 0 );
    memset( message_str, 0x00, 1000 );
    memset( hash_result, 0x00, 1000 );
    memset( result_str, 0x00, 1000 );
    memset( output, 0x00, sizeof( output ) );

    TEST_ASSERT( mbedtls_mpi_read_string( &N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_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 );

    unhexify( message_str, message_hex_string );
    hash_len = unhexify( hash_result, hash_result_string );
    unhexify( result_str, result_hex_str );

    TEST_ASSERT( mbedtls_rsa_pkcs1_verify( &ctx, NULL, NULL,
                              MBEDTLS_RSA_PUBLIC, MBEDTLS_MD_NONE,
                              hash_len, hash_result,
                              result_str ) == correct );

    /* For PKCS#1 v1.5, there is an alternative way to verify signatures */
    if( padding_mode == MBEDTLS_RSA_PKCS_V15 )
    {
        int ok;

        TEST_ASSERT( mbedtls_rsa_rsaes_pkcs1_v15_decrypt( &ctx,
                    NULL, NULL, MBEDTLS_RSA_PUBLIC,
                    &olen, result_str, output, sizeof( output ) ) == 0 );

        ok = olen == hash_len && memcmp( output, hash_result, olen ) == 0;
        if( correct == 0 )
            TEST_ASSERT( ok == 1 );
        else
            TEST_ASSERT( ok == 0 );
    }

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

/* BEGIN_CASE */
void mbedtls_rsa_pkcs1_encrypt( char *message_hex_string, int padding_mode, 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 output[1000];
    unsigned char output_str[1000];
    mbedtls_rsa_context ctx;
    size_t msg_len;
    rnd_pseudo_info rnd_info;

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

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

    mbedtls_rsa_init( &ctx, padding_mode, 0 );
    memset( message_str, 0x00, 1000 );
    memset( output, 0x00, 1000 );
    memset( output_str, 0x00, 1000 );

    TEST_ASSERT( mbedtls_mpi_read_string( &N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_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 );

    msg_len = unhexify( message_str, message_hex_string );

    TEST_ASSERT( mbedtls_rsa_pkcs1_encrypt( &ctx, &rnd_pseudo_rand, &rnd_info, MBEDTLS_RSA_PUBLIC, msg_len, message_str, output ) == result );
    if( result == 0 )
    {
        hexify( output_str, output, ctx.len );

        TEST_ASSERT( strcasecmp( (char *) output_str, result_hex_str ) == 0 );
    }

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

/* BEGIN_CASE */
void rsa_pkcs1_encrypt_bad_rng( char *message_hex_string, int padding_mode,
                                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 output[1000];
    unsigned char output_str[1000];
    mbedtls_rsa_context ctx;
    size_t msg_len;

    mbedtls_mpi N, E;

    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &E );
    mbedtls_rsa_init( &ctx, padding_mode, 0 );
    memset( message_str, 0x00, 1000 );
    memset( output, 0x00, 1000 );
    memset( output_str, 0x00, 1000 );

    TEST_ASSERT( mbedtls_mpi_read_string( &N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_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 );

    msg_len = unhexify( message_str, message_hex_string );

    TEST_ASSERT( mbedtls_rsa_pkcs1_encrypt( &ctx, &rnd_zero_rand, NULL, MBEDTLS_RSA_PUBLIC, msg_len, message_str, output ) == result );
    if( result == 0 )
    {
        hexify( output_str, output, ctx.len );

        TEST_ASSERT( strcasecmp( (char *) output_str, result_hex_str ) == 0 );
    }

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

/* BEGIN_CASE */
void mbedtls_rsa_pkcs1_decrypt( char *message_hex_string, int padding_mode, 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,
                        int max_output, char *result_hex_str, int result )
{
    unsigned char message_str[1000];
    unsigned char output[1000];
    unsigned char output_str[1000];
    mbedtls_rsa_context ctx;
    size_t output_len;
    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, padding_mode, 0 );

    memset( message_str, 0x00, 1000 );
    memset( output, 0x00, 1000 );
    memset( output_str, 0x00, 1000 );
    memset( &rnd_info, 0, sizeof( rnd_pseudo_info ) );


    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_mpi_read_string( &N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_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, NULL, NULL ) == 0 );
    TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );

    unhexify( message_str, message_hex_string );
    output_len = 0;

    TEST_ASSERT( mbedtls_rsa_pkcs1_decrypt( &ctx, rnd_pseudo_rand, &rnd_info, MBEDTLS_RSA_PRIVATE, &output_len, message_str, output, max_output ) == result );
    if( result == 0 )
    {
        hexify( output_str, output, ctx.len );

        TEST_ASSERT( strncasecmp( (char *) output_str, result_hex_str, strlen( result_hex_str ) ) == 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( char *message_hex_string, 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 output[1000];
    unsigned char output_str[1000];
    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_PKCS_V15, 0 );
    mbedtls_rsa_init( &ctx2, MBEDTLS_RSA_PKCS_V15, 0 );
    memset( message_str, 0x00, 1000 );
    memset( output, 0x00, 1000 );
    memset( output_str, 0x00, 1000 );

    TEST_ASSERT( mbedtls_mpi_read_string( &N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_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 );

    unhexify( message_str, message_hex_string );

    TEST_ASSERT( mbedtls_rsa_public( &ctx, message_str, output ) == result );
    if( result == 0 )
    {
        hexify( output_str, output, ctx.len );

        TEST_ASSERT( strcasecmp( (char *) output_str, result_hex_str ) == 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, 1000 );
    memset( output_str, 0x00, 1000 );
    TEST_ASSERT( mbedtls_rsa_public( &ctx2, message_str, output ) == result );
    if( result == 0 )
    {
        hexify( output_str, output, ctx2.len );

        TEST_ASSERT( strcasecmp( (char *) output_str, result_hex_str ) == 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( char *message_hex_string, 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 *result_hex_str, int result )
{
    unsigned char message_str[1000];
    unsigned char output[1000];
    unsigned char output_str[1000];
    mbedtls_rsa_context ctx, ctx2; /* Also test mbedtls_rsa_copy() while at it */
    mbedtls_mpi N, P, Q, E;
    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_PKCS_V15, 0 );
    mbedtls_rsa_init( &ctx2, MBEDTLS_RSA_PKCS_V15, 0 );

    memset( message_str, 0x00, 1000 );
    memset( &rnd_info, 0, sizeof( rnd_pseudo_info ) );

    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_mpi_read_string( &N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_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, NULL, NULL ) == 0 );
    TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );

    unhexify( message_str, message_hex_string );

    /* repeat three times to test updating of blinding values */
    for( i = 0; i < 3; i++ )
    {
        memset( output, 0x00, 1000 );
        memset( output_str, 0x00, 1000 );
        TEST_ASSERT( mbedtls_rsa_private( &ctx, rnd_pseudo_rand, &rnd_info,
                                  message_str, output ) == result );
        if( result == 0 )
        {
            hexify( output_str, output, ctx.len );

            TEST_ASSERT( strcasecmp( (char *) output_str,
                                              result_hex_str ) == 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, 1000 );
    memset( output_str, 0x00, 1000 );
    TEST_ASSERT( mbedtls_rsa_private( &ctx2, rnd_pseudo_rand, &rnd_info,
                              message_str, output ) == result );
    if( result == 0 )
    {
        hexify( output_str, output, ctx2.len );

        TEST_ASSERT( strcasecmp( (char *) output_str,
                                          result_hex_str ) == 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( int radix_N, char *input_N, int radix_E, 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, MBEDTLS_RSA_PKCS_V15, 0 );

    if( strlen( input_N ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &N, radix_N, input_N ) == 0 );
    }
    if( strlen( input_E ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_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, int radix_P, char *input_P, int radix_Q,
                        char *input_Q, int radix_N, char *input_N,
                        int radix_E, char *input_E, int radix_D, char *input_D,
                        int radix_DP, char *input_DP, int radix_DQ,
                        char *input_DQ, int radix_QP, char *input_QP,
                        int result )
{
    mbedtls_rsa_context ctx;

    mbedtls_rsa_init( &ctx, MBEDTLS_RSA_PKCS_V15, 0 );

    ctx.len = mod / 8;
    if( strlen( input_P ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &ctx.P, radix_P, input_P ) == 0 );
    }
    if( strlen( input_Q ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &ctx.Q, radix_Q, input_Q ) == 0 );
    }
    if( strlen( input_N ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &ctx.N, radix_N, input_N ) == 0 );
    }
    if( strlen( input_E ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &ctx.E, radix_E, input_E ) == 0 );
    }
    if( strlen( input_D ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &ctx.D, radix_D, input_D ) == 0 );
    }
#if !defined(MBEDTLS_RSA_NO_CRT)
    if( strlen( input_DP ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &ctx.DP, radix_DP, input_DP ) == 0 );
    }
    if( strlen( input_DQ ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &ctx.DQ, radix_DQ, input_DQ ) == 0 );
    }
    if( strlen( input_QP ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &ctx.QP, radix_QP, input_QP ) == 0 );
    }
#else
    ((void) radix_DP); ((void) input_DP);
    ((void) radix_DQ); ((void) input_DQ);
    ((void) radix_QP); ((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, int radix_Npub, char *input_Npub,
                        int radix_Epub, char *input_Epub,
                        int radix_P, char *input_P, int radix_Q,
                        char *input_Q, int radix_N, char *input_N,
                        int radix_E, char *input_E, int radix_D, char *input_D,
                        int radix_DP, char *input_DP, int radix_DQ,
                        char *input_DQ, int radix_QP, char *input_QP,
                        int result )
{
    mbedtls_rsa_context pub, prv;

    mbedtls_rsa_init( &pub, MBEDTLS_RSA_PKCS_V15, 0 );
    mbedtls_rsa_init( &prv, MBEDTLS_RSA_PKCS_V15, 0 );

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

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

    if( strlen( input_P ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &prv.P, radix_P, input_P ) == 0 );
    }
    if( strlen( input_Q ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &prv.Q, radix_Q, input_Q ) == 0 );
    }
    if( strlen( input_N ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &prv.N, radix_N, input_N ) == 0 );
    }
    if( strlen( input_E ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &prv.E, radix_E, input_E ) == 0 );
    }
    if( strlen( input_D ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &prv.D, radix_D, input_D ) == 0 );
    }
#if !defined(MBEDTLS_RSA_NO_CRT)
    if( strlen( input_DP ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &prv.DP, radix_DP, input_DP ) == 0 );
    }
    if( strlen( input_DQ ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &prv.DQ, radix_DQ, input_DQ ) == 0 );
    }
    if( strlen( input_QP ) )
    {
        TEST_ASSERT( mbedtls_mpi_read_string( &prv.QP, radix_QP, input_QP ) == 0 );
    }
#else
    ((void) radix_DP); ((void) input_DP);
    ((void) radix_DQ); ((void) input_DQ);
    ((void) radix_QP); ((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 depends_on:MBEDTLS_CTR_DRBG_C:MBEDTLS_ENTROPY_C */
void mbedtls_rsa_gen_key( int nrbits, int exponent, int result)
{
    mbedtls_rsa_context ctx;
    mbedtls_entropy_context entropy;
    mbedtls_ctr_drbg_context ctr_drbg;
    const char *pers = "test_suite_rsa";

    mbedtls_ctr_drbg_init( &ctr_drbg );

    mbedtls_entropy_init( &entropy );
    TEST_ASSERT( mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func,
                                        &entropy, (const unsigned char *) pers,
                                        strlen( pers ) ) == 0 );

    mbedtls_rsa_init( &ctx, 0, 0 );

    TEST_ASSERT( mbedtls_rsa_gen_key( &ctx, mbedtls_ctr_drbg_random,
                                      &ctr_drbg, 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 );
    mbedtls_ctr_drbg_free( &ctr_drbg );
    mbedtls_entropy_free( &entropy );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_CTR_DRBG_C:MBEDTLS_ENTROPY_C */
void mbedtls_rsa_deduce_primes( int radix_N, char *input_N,
                                int radix_D, char *input_D,
                                int radix_E, char *input_E,
                                int radix_P, char *output_P,
                                int radix_Q, 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_mpi_read_string( &N, radix_N, input_N ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &D, radix_D, input_D ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_E, input_E ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &Qp, radix_P, output_P ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &Pp, radix_Q, 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( int radix_P, char *input_P,
                                          int radix_Q, char *input_Q,
                                          int radix_E, char *input_E,
                                          int radix_D, 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_mpi_read_string( &P, radix_P, input_P ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &Q, radix_Q, input_Q ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_E, input_E ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &Dp, radix_D, 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 depends_on:MBEDTLS_CTR_DRBG_C:MBEDTLS_ENTROPY_C */
void mbedtls_rsa_import( int radix_N, char *input_N,
                         int radix_P, char *input_P,
                         int radix_Q, char *input_Q,
                         int radix_D, char *input_D,
                         int radix_E, char *input_E,
                         int successive,
                         int is_priv,
                         int result )
{
    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;

    mbedtls_entropy_context entropy;
    mbedtls_ctr_drbg_context ctr_drbg;
    const char *pers = "test_suite_rsa";

    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_ctr_drbg_init( &ctr_drbg );

    mbedtls_entropy_init( &entropy );
    TEST_ASSERT( mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func, &entropy,
                                (const unsigned char *) pers, strlen( pers ) ) == 0 );

    mbedtls_rsa_init( &ctx, 0, 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_mpi_read_string( &N, radix_N, input_N ) == 0 );

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

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

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

    if( have_E )
        TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_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,
                                       mbedtls_ctr_drbg_random,
                                       &ctr_drbg ) == result );

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

        /* Did we expect a full private key to be setup? */
        if( is_priv )
            TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );

        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;

        TEST_ASSERT( mbedtls_ctr_drbg_random( &ctr_drbg,
                              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 )
        {
            TEST_ASSERT( mbedtls_rsa_private( &ctx, mbedtls_ctr_drbg_random,
                                              &ctr_drbg, 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_ctr_drbg_free( &ctr_drbg );
    mbedtls_entropy_free( &entropy );

    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( int radix_N, char *input_N,
                         int radix_P, char *input_P,
                         int radix_Q, char *input_Q,
                         int radix_D, char *input_D,
                         int radix_E, 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, 0, 0 );

    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_mpi_read_string( &N, radix_N, input_N ) == 0 );

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

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

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

    if( have_E )
        TEST_ASSERT( mbedtls_mpi_read_string( &E, radix_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, NULL, NULL ) == 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( int radix_N, char *input_N,
                                  int radix_P, char *input_P,
                                  int radix_Q, char *input_Q,
                                  int radix_D, char *input_D,
                                  int radix_E, 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_entropy_context entropy;
    mbedtls_ctr_drbg_context ctr_drbg;
    const char *pers = "test_suite_rsa";

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

    mbedtls_ctr_drbg_init( &ctr_drbg );
    mbedtls_entropy_init( &entropy );
    TEST_ASSERT( mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func,
                                        &entropy, (const unsigned char *) pers,
                                        strlen( pers ) ) == 0 );

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

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

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

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

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

    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_ctr_drbg_random : NULL,
                                        prng ? &ctr_drbg : NULL ) == result );
exit:

    mbedtls_ctr_drbg_free( &ctr_drbg );
    mbedtls_entropy_free( &entropy );

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

/* BEGIN_CASE depends_on:MBEDTLS_CTR_DRBG_C:MBEDTLS_ENTROPY_C */
void mbedtls_rsa_export_raw( char *input_N, char *input_P,
                             char *input_Q, char *input_D,
                             char *input_E, int is_priv,
                             int successive )
{
    /* Original raw buffers with which we set up the RSA context */
    unsigned char bufN[1000];
    unsigned char bufP[1000];
    unsigned char bufQ[1000];
    unsigned char bufD[1000];
    unsigned char bufE[1000];

    size_t lenN = 0;
    size_t lenP = 0;
    size_t lenQ = 0;
    size_t lenD = 0;
    size_t lenE = 0;

    /* Exported buffers */
    unsigned char bufNe[ sizeof( bufN ) ];
    unsigned char bufPe[ sizeof( bufP ) ];
    unsigned char bufQe[ sizeof( bufQ ) ];
    unsigned char bufDe[ sizeof( bufD ) ];
    unsigned char bufEe[ sizeof( bufE ) ];

    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, 0, 0 );

    /* Setup RSA context */

    if( have_N )
        lenN = unhexify( bufN, input_N );

    if( have_P )
        lenP = unhexify( bufP, input_P );

    if( have_Q )
        lenQ = unhexify( bufQ, input_Q );

    if( have_D )
        lenD = unhexify( bufD, input_D );

    if( have_E )
        lenE = unhexify( bufE, input_E );

    TEST_ASSERT( mbedtls_rsa_import_raw( &ctx,
                               have_N ? bufN : NULL, lenN,
                               have_P ? bufP : NULL, lenP,
                               have_Q ? bufQ : NULL, lenQ,
                               have_D ? bufD : NULL, lenD,
                               have_E ? bufE : NULL, lenE ) == 0 );

    TEST_ASSERT( mbedtls_rsa_complete( &ctx, NULL, NULL ) == 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, lenN,
                                             NULL, 0, NULL, 0, NULL, 0,
                                             bufEe, lenE ) == 0 );
    }
    else
    {
        TEST_ASSERT( mbedtls_rsa_export_raw( &ctx, bufNe, lenN,
                                             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, lenE ) == 0 );
    }
    TEST_ASSERT( memcmp( bufN, bufNe, lenN ) == 0 );
    TEST_ASSERT( memcmp( bufE, bufEe, lenE ) == 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, lenP ? lenP : sizeof( bufPe ),
                                         bufQe, lenQ ? lenQ : sizeof( bufQe ),
                                         bufDe, lenD ? lenD : sizeof( bufDe ),
                                         NULL, 0 ) == 0 );
        }
        else
        {
            TEST_ASSERT( mbedtls_rsa_export_raw( &ctx, NULL, 0,
                                         bufPe, lenP ? lenP : sizeof( bufPe ),
                                         NULL, 0, NULL, 0,
                                         NULL, 0 ) == 0 );

            TEST_ASSERT( mbedtls_rsa_export_raw( &ctx, NULL, 0, NULL, 0,
                                         bufQe, lenQ ? lenQ : sizeof( bufQe ),
                                         NULL, 0, NULL, 0 ) == 0 );

            TEST_ASSERT( mbedtls_rsa_export_raw( &ctx, NULL, 0, NULL, 0,
                                         NULL, 0, bufDe, lenD ? lenD : sizeof( bufDe ),
                                         NULL, 0 ) == 0 );
        }

        if( have_P )
            TEST_ASSERT( memcmp( bufP, bufPe, lenP ) == 0 );

        if( have_Q )
            TEST_ASSERT( memcmp( bufQ, bufQe, lenQ ) == 0 );

        if( have_D )
            TEST_ASSERT( memcmp( bufD, bufDe, lenD ) == 0 );

    }

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

/* BEGIN_CASE depends_on:MBEDTLS_CTR_DRBG_C:MBEDTLS_ENTROPY_C */
void mbedtls_rsa_import_raw( char *input_N,
                             char *input_P, char *input_Q,
                             char *input_D, char *input_E,
                             int successive,
                             int is_priv,
                             int result )
{
    unsigned char bufN[1000];
    unsigned char bufP[1000];
    unsigned char bufQ[1000];
    unsigned char bufD[1000];
    unsigned char bufE[1000];

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

    size_t lenN = 0;
    size_t lenP = 0;
    size_t lenQ = 0;
    size_t lenD = 0;
    size_t lenE = 0;

    mbedtls_rsa_context ctx;
    mbedtls_entropy_context entropy;
    mbedtls_ctr_drbg_context ctr_drbg;

    const char *pers = "test_suite_rsa";

    mbedtls_ctr_drbg_init( &ctr_drbg );
    mbedtls_entropy_init( &entropy );
    mbedtls_rsa_init( &ctx, 0, 0 );

    TEST_ASSERT( mbedtls_ctr_drbg_seed( &ctr_drbg, mbedtls_entropy_func,
                                        &entropy, (const unsigned char *) pers,
                                        strlen( pers ) ) == 0 );

    if( strlen( input_N ) )
        lenN = unhexify( bufN, input_N );

    if( strlen( input_P ) )
        lenP = unhexify( bufP, input_P );

    if( strlen( input_Q ) )
        lenQ = unhexify( bufQ, input_Q );

    if( strlen( input_D ) )
        lenD = unhexify( bufD, input_D );

    if( strlen( input_E ) )
        lenE = unhexify( bufE, input_E );

    if( !successive )
    {
        TEST_ASSERT( mbedtls_rsa_import_raw( &ctx,
                               ( lenN > 0 ) ? bufN : NULL, lenN,
                               ( lenP > 0 ) ? bufP : NULL, lenP,
                               ( lenQ > 0 ) ? bufQ : NULL, lenQ,
                               ( lenD > 0 ) ? bufD : NULL, lenD,
                               ( lenE > 0 ) ? bufE : NULL, lenE ) == 0 );
    }
    else
    {
        /* Import N, P, Q, D, E separately.
         * This should make no functional difference. */

        TEST_ASSERT( mbedtls_rsa_import_raw( &ctx,
                               ( lenN > 0 ) ? bufN : NULL, lenN,
                               NULL, 0, NULL, 0, NULL, 0, NULL, 0 ) == 0 );

        TEST_ASSERT( mbedtls_rsa_import_raw( &ctx,
                               NULL, 0,
                               ( lenP > 0 ) ? bufP : NULL, lenP,
                               NULL, 0, NULL, 0, NULL, 0 ) == 0 );

        TEST_ASSERT( mbedtls_rsa_import_raw( &ctx,
                               NULL, 0, NULL, 0,
                               ( lenQ > 0 ) ? bufQ : NULL, lenQ,
                               NULL, 0, NULL, 0 ) == 0 );

        TEST_ASSERT( mbedtls_rsa_import_raw( &ctx,
                               NULL, 0, NULL, 0, NULL, 0,
                               ( lenD > 0 ) ? bufD : NULL, lenD,
                               NULL, 0 ) == 0 );

        TEST_ASSERT( mbedtls_rsa_import_raw( &ctx,
                               NULL, 0, NULL, 0, NULL, 0, NULL, 0,
                               ( lenE > 0 ) ? bufE : NULL, lenE ) == 0 );
    }

    TEST_ASSERT( mbedtls_rsa_complete( &ctx,
                                       mbedtls_ctr_drbg_random,
                                       &ctr_drbg ) == result );

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

        /* Did we expect a full private key to be setup? */
        if( is_priv )
            TEST_ASSERT( mbedtls_rsa_check_privkey( &ctx ) == 0 );

        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;

        TEST_ASSERT( mbedtls_ctr_drbg_random( &ctr_drbg,
                              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 )
        {
            TEST_ASSERT( mbedtls_rsa_private( &ctx, mbedtls_ctr_drbg_random,
                                              &ctr_drbg, 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_ctr_drbg_free( &ctr_drbg );
    mbedtls_entropy_free( &entropy );

}
/* END_CASE */

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