mbedtls/tests/suites/test_suite_ecp.function

/* BEGIN_HEADER */
#include "mbedtls/ecp.h"

#include "ecp_invasive.h"

#if defined(MBEDTLS_TEST_HOOKS) &&                  \
    ( defined(MBEDTLS_ECP_DP_SECP224R1_ENABLED) ||  \
      defined(MBEDTLS_ECP_DP_SECP256R1_ENABLED) ||  \
      defined(MBEDTLS_ECP_DP_SECP384R1_ENABLED) )
#define HAVE_FIX_NEGATIVE
#endif

#define ECP_PF_UNKNOWN     -1

#define ECP_PT_RESET( x )           \
    mbedtls_ecp_point_free( x );    \
    mbedtls_ecp_point_init( x );

/* Auxiliary function to compare two mbedtls_ecp_group objects. */
inline static int mbedtls_ecp_group_cmp( mbedtls_ecp_group *grp1,
                                         mbedtls_ecp_group *grp2 )
{
    if( mbedtls_mpi_cmp_mpi( &grp1->P, &grp2->P ) != 0 )
        return 1;
    if( mbedtls_mpi_cmp_mpi( &grp1->A, &grp2->A ) != 0 )
        return 1;
    if( mbedtls_mpi_cmp_mpi( &grp1->B, &grp2->B ) != 0 )
        return 1;
    if( mbedtls_mpi_cmp_mpi( &grp1->N, &grp2->N ) != 0 )
        return 1;
    if( mbedtls_ecp_point_cmp( &grp1->G, &grp2->G ) != 0 )
        return 1;
    if( grp1->id != grp2->id )
        return 1;
    if( grp1->pbits != grp2->pbits )
        return 1;
    if( grp1->nbits != grp2->nbits )
        return 1;
    if( grp1->h != grp2->h )
        return 1;
    if( grp1->modp != grp2->modp )
        return 1;
    if( grp1->t_pre != grp2->t_pre )
        return 1;
    if( grp1->t_post != grp2->t_post )
        return 1;
    if( grp1->t_data != grp2->t_data )
        return 1;
    if( grp1->T_size != grp2->T_size )
        return 1;
    if( grp1->T != grp2->T )
        return 1;

    return 0;
}

/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_ECP_C
 * END_DEPENDENCIES
 */

/* BEGIN_CASE */
void ecp_invalid_param( )
{
    mbedtls_ecp_group grp;
    mbedtls_ecp_point P;
    int invalid_fmt = 42;
    size_t olen;
    unsigned char buf[42] = { 0 };

    TEST_EQUAL( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
                            mbedtls_ecp_point_write_binary( &grp, &P,
                                                      invalid_fmt,
                                                      &olen,
                                                      buf, sizeof( buf ) ) );
    TEST_EQUAL( MBEDTLS_ERR_ECP_BAD_INPUT_DATA,
                            mbedtls_ecp_tls_write_point( &grp, &P,
                                                     invalid_fmt,
                                                     &olen,
                                                     buf,
                                                     sizeof( buf ) ) );

exit:
    return;
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_ecp_curve_info( int id, int tls_id, int size, char * name )
{
    const mbedtls_ecp_curve_info *by_id, *by_tls, *by_name;

    by_id   = mbedtls_ecp_curve_info_from_grp_id( id     );
    by_tls  = mbedtls_ecp_curve_info_from_tls_id( tls_id );
    by_name = mbedtls_ecp_curve_info_from_name(   name   );
    TEST_ASSERT( by_id   != NULL );
    TEST_ASSERT( by_tls  != NULL );
    TEST_ASSERT( by_name != NULL );

    TEST_ASSERT( by_id == by_tls  );
    TEST_ASSERT( by_id == by_name );

    TEST_ASSERT( by_id->bit_size == size );
    TEST_ASSERT( size <= MBEDTLS_ECP_MAX_BITS );
    TEST_ASSERT( size <= MBEDTLS_ECP_MAX_BYTES * 8 );
}
/* END_CASE */

/* BEGIN_CASE */
void ecp_check_pub( int grp_id, char * x_hex, char * y_hex, char * z_hex,
                    int ret )
{
    mbedtls_ecp_group grp;
    mbedtls_ecp_point P;

    mbedtls_ecp_group_init( &grp );
    mbedtls_ecp_point_init( &P );

    TEST_ASSERT( mbedtls_ecp_group_load( &grp, grp_id ) == 0 );

    TEST_ASSERT( mbedtls_test_read_mpi( &P.X, x_hex ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &P.Y, y_hex ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &P.Z, z_hex ) == 0 );

    TEST_ASSERT( mbedtls_ecp_check_pubkey( &grp, &P ) == ret );

exit:
    mbedtls_ecp_group_free( &grp );
    mbedtls_ecp_point_free( &P );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_ECP_RESTARTABLE */
void ecp_test_vect_restart( int id,
                            char *dA_str, char *xA_str, char *yA_str,
                            char *dB_str,  char *xZ_str, char *yZ_str,
                            int max_ops, int min_restarts, int max_restarts )
{
    /*
     * Test for early restart. Based on test vectors like ecp_test_vect(),
     * but for the sake of simplicity only does half of each side. It's
     * important to test both base point and random point, though, as memory
     * management is different in each case.
     *
     * Don't try using too precise bounds for restarts as the exact number
     * will depend on settings such as MBEDTLS_ECP_FIXED_POINT_OPTIM and
     * MBEDTLS_ECP_WINDOW_SIZE, as well as implementation details that may
     * change in the future. A factor 2 is a minimum safety margin.
     *
     * For reference, with mbed TLS 2.4 and default settings, for P-256:
     * - Random point mult:     ~3250M
     * - Cold base point mult:  ~3300M
     * - Hot base point mult:   ~1100M
     * With MBEDTLS_ECP_WINDOW_SIZE set to 2 (minimum):
     * - Random point mult:     ~3850M
     */
    mbedtls_ecp_restart_ctx ctx;
    mbedtls_ecp_group grp;
    mbedtls_ecp_point R, P;
    mbedtls_mpi dA, xA, yA, dB, xZ, yZ;
    int cnt_restarts;
    int ret;
    mbedtls_test_rnd_pseudo_info rnd_info;

    mbedtls_ecp_restart_init( &ctx );
    mbedtls_ecp_group_init( &grp );
    mbedtls_ecp_point_init( &R ); mbedtls_ecp_point_init( &P );
    mbedtls_mpi_init( &dA ); mbedtls_mpi_init( &xA ); mbedtls_mpi_init( &yA );
    mbedtls_mpi_init( &dB ); mbedtls_mpi_init( &xZ ); mbedtls_mpi_init( &yZ );
    memset( &rnd_info, 0x00, sizeof( mbedtls_test_rnd_pseudo_info ) );

    TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );

    TEST_ASSERT( mbedtls_test_read_mpi( &dA, dA_str ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &xA, xA_str ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &yA, yA_str ) == 0 );

    TEST_ASSERT( mbedtls_test_read_mpi( &dB, dB_str ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &xZ, xZ_str ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &yZ, yZ_str ) == 0 );

    mbedtls_ecp_set_max_ops( (unsigned) max_ops );

    /* Base point case */
    cnt_restarts = 0;
    do {
        ECP_PT_RESET( &R );
        ret = mbedtls_ecp_mul_restartable( &grp, &R, &dA, &grp.G,
                &mbedtls_test_rnd_pseudo_rand, &rnd_info, &ctx );
    } while( ret == MBEDTLS_ERR_ECP_IN_PROGRESS && ++cnt_restarts );

    TEST_ASSERT( ret == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.X, &xA ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.Y, &yA ) == 0 );

    TEST_ASSERT( cnt_restarts >= min_restarts );
    TEST_ASSERT( cnt_restarts <= max_restarts );

    /* Non-base point case */
    mbedtls_ecp_copy( &P, &R );
    cnt_restarts = 0;
    do {
        ECP_PT_RESET( &R );
        ret = mbedtls_ecp_mul_restartable( &grp, &R, &dB, &P,
                &mbedtls_test_rnd_pseudo_rand, &rnd_info, &ctx );
    } while( ret == MBEDTLS_ERR_ECP_IN_PROGRESS && ++cnt_restarts );

    TEST_ASSERT( ret == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.X, &xZ ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.Y, &yZ ) == 0 );

    TEST_ASSERT( cnt_restarts >= min_restarts );
    TEST_ASSERT( cnt_restarts <= max_restarts );

    /* Do we leak memory when aborting an operation?
     * This test only makes sense when we actually restart */
    if( min_restarts > 0 )
    {
        ret = mbedtls_ecp_mul_restartable( &grp, &R, &dB, &P,
                &mbedtls_test_rnd_pseudo_rand, &rnd_info, &ctx );
        TEST_ASSERT( ret == MBEDTLS_ERR_ECP_IN_PROGRESS );
    }

exit:
    mbedtls_ecp_restart_free( &ctx );
    mbedtls_ecp_group_free( &grp );
    mbedtls_ecp_point_free( &R ); mbedtls_ecp_point_free( &P );
    mbedtls_mpi_free( &dA ); mbedtls_mpi_free( &xA ); mbedtls_mpi_free( &yA );
    mbedtls_mpi_free( &dB ); mbedtls_mpi_free( &xZ ); mbedtls_mpi_free( &yZ );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_ECP_RESTARTABLE */
void ecp_muladd_restart( int id, char *xR_str, char *yR_str,
                         char *u1_str, char *u2_str,
                         char *xQ_str, char *yQ_str,
                         int max_ops, int min_restarts, int max_restarts )
{
    /*
     * Compute R = u1 * G + u2 * Q
     * (test vectors mostly taken from ECDSA intermediate results)
     *
     * See comments at the top of ecp_test_vect_restart()
     */
    mbedtls_ecp_restart_ctx ctx;
    mbedtls_ecp_group grp;
    mbedtls_ecp_point R, Q;
    mbedtls_mpi u1, u2, xR, yR;
    int cnt_restarts;
    int ret;

    mbedtls_ecp_restart_init( &ctx );
    mbedtls_ecp_group_init( &grp );
    mbedtls_ecp_point_init( &R );
    mbedtls_ecp_point_init( &Q );
    mbedtls_mpi_init( &u1 ); mbedtls_mpi_init( &u2 );
    mbedtls_mpi_init( &xR ); mbedtls_mpi_init( &yR );

    TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );

    TEST_ASSERT( mbedtls_test_read_mpi( &u1, u1_str ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &u2, u2_str ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &xR, xR_str ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &yR, yR_str ) == 0 );

    TEST_ASSERT( mbedtls_test_read_mpi( &Q.X, xQ_str ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &Q.Y, yQ_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_lset( &Q.Z, 1 ) == 0 );

    mbedtls_ecp_set_max_ops( (unsigned) max_ops );

    cnt_restarts = 0;
    do {
        ECP_PT_RESET( &R );
        ret = mbedtls_ecp_muladd_restartable( &grp, &R,
                                              &u1, &grp.G, &u2, &Q, &ctx );
    } while( ret == MBEDTLS_ERR_ECP_IN_PROGRESS && ++cnt_restarts );

    TEST_ASSERT( ret == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.X, &xR ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.Y, &yR ) == 0 );

    TEST_ASSERT( cnt_restarts >= min_restarts );
    TEST_ASSERT( cnt_restarts <= max_restarts );

    /* Do we leak memory when aborting an operation?
     * This test only makes sense when we actually restart */
    if( min_restarts > 0 )
    {
        ret = mbedtls_ecp_muladd_restartable( &grp, &R,
                                              &u1, &grp.G, &u2, &Q, &ctx );
        TEST_ASSERT( ret == MBEDTLS_ERR_ECP_IN_PROGRESS );
    }

exit:
    mbedtls_ecp_restart_free( &ctx );
    mbedtls_ecp_group_free( &grp );
    mbedtls_ecp_point_free( &R );
    mbedtls_ecp_point_free( &Q );
    mbedtls_mpi_free( &u1 ); mbedtls_mpi_free( &u2 );
    mbedtls_mpi_free( &xR ); mbedtls_mpi_free( &yR );
}
/* END_CASE */

/* BEGIN_CASE */
void ecp_test_vect( int id, char * dA_str, char * xA_str, char * yA_str,
                    char * dB_str, char * xB_str, char * yB_str,
                    char * xZ_str, char * yZ_str )
{
    mbedtls_ecp_group grp;
    mbedtls_ecp_point R;
    mbedtls_mpi dA, xA, yA, dB, xB, yB, xZ, yZ;
    mbedtls_test_rnd_pseudo_info rnd_info;

    mbedtls_ecp_group_init( &grp ); mbedtls_ecp_point_init( &R );
    mbedtls_mpi_init( &dA ); mbedtls_mpi_init( &xA ); mbedtls_mpi_init( &yA ); mbedtls_mpi_init( &dB );
    mbedtls_mpi_init( &xB ); mbedtls_mpi_init( &yB ); mbedtls_mpi_init( &xZ ); mbedtls_mpi_init( &yZ );
    memset( &rnd_info, 0x00, sizeof( mbedtls_test_rnd_pseudo_info ) );

    TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );

    TEST_ASSERT( mbedtls_ecp_check_pubkey( &grp, &grp.G ) == 0 );

    TEST_ASSERT( mbedtls_test_read_mpi( &dA, dA_str ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &xA, xA_str ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &yA, yA_str ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &dB, dB_str ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &xB, xB_str ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &yB, yB_str ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &xZ, xZ_str ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &yZ, yZ_str ) == 0 );

    TEST_ASSERT( mbedtls_ecp_mul( &grp, &R, &dA, &grp.G,
                          &mbedtls_test_rnd_pseudo_rand, &rnd_info ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.X, &xA ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.Y, &yA ) == 0 );
    TEST_ASSERT( mbedtls_ecp_check_pubkey( &grp, &R ) == 0 );
    TEST_ASSERT( mbedtls_ecp_mul( &grp, &R, &dB, &R,
                          &mbedtls_test_rnd_pseudo_rand, &rnd_info ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.X, &xZ ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.Y, &yZ ) == 0 );
    TEST_ASSERT( mbedtls_ecp_check_pubkey( &grp, &R ) == 0 );

    TEST_ASSERT( mbedtls_ecp_mul( &grp, &R, &dB, &grp.G,
                          &mbedtls_test_rnd_pseudo_rand, &rnd_info ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.X, &xB ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.Y, &yB ) == 0 );
    TEST_ASSERT( mbedtls_ecp_check_pubkey( &grp, &R ) == 0 );
    TEST_ASSERT( mbedtls_ecp_mul( &grp, &R, &dA, &R,
                          &mbedtls_test_rnd_pseudo_rand, &rnd_info ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.X, &xZ ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.Y, &yZ ) == 0 );
    TEST_ASSERT( mbedtls_ecp_check_pubkey( &grp, &R ) == 0 );

exit:
    mbedtls_ecp_group_free( &grp ); mbedtls_ecp_point_free( &R );
    mbedtls_mpi_free( &dA ); mbedtls_mpi_free( &xA ); mbedtls_mpi_free( &yA ); mbedtls_mpi_free( &dB );
    mbedtls_mpi_free( &xB ); mbedtls_mpi_free( &yB ); mbedtls_mpi_free( &xZ ); mbedtls_mpi_free( &yZ );
}
/* END_CASE */

/* BEGIN_CASE */
void ecp_test_vec_x( int id, char * dA_hex, char * xA_hex, char * dB_hex,
                     char * xB_hex, char * xS_hex )
{
    mbedtls_ecp_group grp;
    mbedtls_ecp_point R;
    mbedtls_mpi dA, xA, dB, xB, xS;
    mbedtls_test_rnd_pseudo_info rnd_info;

    mbedtls_ecp_group_init( &grp ); mbedtls_ecp_point_init( &R );
    mbedtls_mpi_init( &dA ); mbedtls_mpi_init( &xA );
    mbedtls_mpi_init( &dB ); mbedtls_mpi_init( &xB );
    mbedtls_mpi_init( &xS );
    memset( &rnd_info, 0x00, sizeof( mbedtls_test_rnd_pseudo_info ) );

    TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );

    TEST_ASSERT( mbedtls_ecp_check_pubkey( &grp, &grp.G ) == 0 );

    TEST_ASSERT( mbedtls_test_read_mpi( &dA, dA_hex ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &dB, dB_hex ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &xA, xA_hex ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &xB, xB_hex ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &xS, xS_hex ) == 0 );

    TEST_ASSERT( mbedtls_ecp_mul( &grp, &R, &dA, &grp.G,
                          &mbedtls_test_rnd_pseudo_rand, &rnd_info ) == 0 );
    TEST_ASSERT( mbedtls_ecp_check_pubkey( &grp, &R ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.X, &xA ) == 0 );

    TEST_ASSERT( mbedtls_ecp_mul( &grp, &R, &dB, &R,
                          &mbedtls_test_rnd_pseudo_rand, &rnd_info ) == 0 );
    TEST_ASSERT( mbedtls_ecp_check_pubkey( &grp, &R ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.X, &xS ) == 0 );

    TEST_ASSERT( mbedtls_ecp_mul( &grp, &R, &dB, &grp.G,
                          &mbedtls_test_rnd_pseudo_rand, &rnd_info ) == 0 );
    TEST_ASSERT( mbedtls_ecp_check_pubkey( &grp, &R ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.X, &xB ) == 0 );

    TEST_ASSERT( mbedtls_ecp_mul( &grp, &R, &dA, &R,
                          &mbedtls_test_rnd_pseudo_rand, &rnd_info ) == 0 );
    TEST_ASSERT( mbedtls_ecp_check_pubkey( &grp, &R ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &R.X, &xS ) == 0 );

exit:
    mbedtls_ecp_group_free( &grp ); mbedtls_ecp_point_free( &R );
    mbedtls_mpi_free( &dA ); mbedtls_mpi_free( &xA );
    mbedtls_mpi_free( &dB ); mbedtls_mpi_free( &xB );
    mbedtls_mpi_free( &xS );
}
/* END_CASE */

/* BEGIN_CASE */
void ecp_test_mul( int id, data_t * n_hex,
                   data_t *  Px_hex, data_t *  Py_hex, data_t *  Pz_hex,
                   data_t * nPx_hex, data_t * nPy_hex, data_t * nPz_hex,
                   int expected_ret )
{
    mbedtls_ecp_group grp;
    mbedtls_ecp_point P, nP, R;
    mbedtls_mpi n;
    mbedtls_test_rnd_pseudo_info rnd_info;

    mbedtls_ecp_group_init( &grp ); mbedtls_ecp_point_init( &R );
    mbedtls_ecp_point_init( &P ); mbedtls_ecp_point_init( &nP );
    mbedtls_mpi_init( &n );
    memset( &rnd_info, 0x00, sizeof( mbedtls_test_rnd_pseudo_info ) );

    TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );

    TEST_ASSERT( mbedtls_ecp_check_pubkey( &grp, &grp.G ) == 0 );

    TEST_ASSERT( mbedtls_mpi_read_binary( &n, n_hex->x, n_hex->len ) == 0 );

    TEST_ASSERT( mbedtls_mpi_read_binary( &P.X, Px_hex->x, Px_hex->len ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_binary( &P.Y, Py_hex->x, Py_hex->len ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_binary( &P.Z, Pz_hex->x, Pz_hex->len ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_binary( &nP.X, nPx_hex->x, nPx_hex->len )
                 == 0 );
    TEST_ASSERT( mbedtls_mpi_read_binary( &nP.Y, nPy_hex->x, nPy_hex->len )
                 == 0 );
    TEST_ASSERT( mbedtls_mpi_read_binary( &nP.Z, nPz_hex->x, nPz_hex->len )
                 == 0 );

    TEST_ASSERT( mbedtls_ecp_mul( &grp, &R, &n, &P,
                                  &mbedtls_test_rnd_pseudo_rand, &rnd_info )
                 == expected_ret );

    if( expected_ret == 0 )
    {
        TEST_ASSERT( mbedtls_mpi_cmp_mpi( &nP.X, &R.X ) == 0 );
        TEST_ASSERT( mbedtls_mpi_cmp_mpi( &nP.Y, &R.Y ) == 0 );
        TEST_ASSERT( mbedtls_mpi_cmp_mpi( &nP.Z, &R.Z ) == 0 );
    }

exit:
    mbedtls_ecp_group_free( &grp ); mbedtls_ecp_point_free( &R );
    mbedtls_ecp_point_free( &P ); mbedtls_ecp_point_free( &nP );
    mbedtls_mpi_free( &n );
}
/* END_CASE */

/* BEGIN_CASE */
void ecp_test_mul_rng( int id, data_t * d_hex)
{
    mbedtls_ecp_group grp;
    mbedtls_mpi d;
    mbedtls_ecp_point Q;

    mbedtls_ecp_group_init( &grp ); mbedtls_mpi_init( &d );
    mbedtls_ecp_point_init( &Q );

    TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );

    TEST_ASSERT( mbedtls_ecp_check_pubkey( &grp, &grp.G ) == 0 );

    TEST_ASSERT( mbedtls_mpi_read_binary( &d, d_hex->x, d_hex->len ) == 0 );

    TEST_ASSERT( mbedtls_ecp_mul( &grp, &Q, &d, &grp.G,
                                  &mbedtls_test_rnd_zero_rand, NULL )
                 == MBEDTLS_ERR_ECP_RANDOM_FAILED );

exit:
    mbedtls_ecp_group_free( &grp ); mbedtls_mpi_free( &d );
    mbedtls_ecp_point_free( &Q );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_ECP_SHORT_WEIERSTRASS_ENABLED */
void ecp_muladd( int id,
                 data_t *u1_bin, data_t *P1_bin,
                 data_t *u2_bin, data_t *P2_bin,
                 data_t *expected_result )
{
    /* Compute R = u1 * P1 + u2 * P2 */
    mbedtls_ecp_group grp;
    mbedtls_ecp_point P1, P2, R;
    mbedtls_mpi u1, u2;
    uint8_t actual_result[MBEDTLS_ECP_MAX_PT_LEN];
    size_t len;

    mbedtls_ecp_group_init( &grp );
    mbedtls_ecp_point_init( &P1 );
    mbedtls_ecp_point_init( &P2 );
    mbedtls_ecp_point_init( &R );
    mbedtls_mpi_init( &u1 );
    mbedtls_mpi_init( &u2 );

    TEST_EQUAL( 0, mbedtls_ecp_group_load( &grp, id ) );
    TEST_EQUAL( 0, mbedtls_mpi_read_binary( &u1, u1_bin->x, u1_bin->len ) );
    TEST_EQUAL( 0, mbedtls_mpi_read_binary( &u2, u2_bin->x, u2_bin->len ) );
    TEST_EQUAL( 0, mbedtls_ecp_point_read_binary( &grp, &P1,
                                                  P1_bin->x, P1_bin->len ) );
    TEST_EQUAL( 0, mbedtls_ecp_point_read_binary( &grp, &P2,
                                                  P2_bin->x, P2_bin->len ) );

    TEST_EQUAL( 0, mbedtls_ecp_muladd( &grp, &R, &u1, &P1, &u2, &P2 ) );
    TEST_EQUAL( 0, mbedtls_ecp_point_write_binary(
                    &grp, &R, MBEDTLS_ECP_PF_UNCOMPRESSED,
                    &len, actual_result, sizeof( actual_result ) ) );
    TEST_ASSERT( len <= MBEDTLS_ECP_MAX_PT_LEN );

    ASSERT_COMPARE( expected_result->x, expected_result->len,
                    actual_result, len );

exit:
    mbedtls_ecp_group_free( &grp );
    mbedtls_ecp_point_free( &P1 );
    mbedtls_ecp_point_free( &P2 );
    mbedtls_ecp_point_free( &R );
    mbedtls_mpi_free( &u1 );
    mbedtls_mpi_free( &u2 );
}
/* END_CASE */

/* BEGIN_CASE */
void ecp_fast_mod( int id, char * N_str )
{
    mbedtls_ecp_group grp;
    mbedtls_mpi N, R;

    mbedtls_mpi_init( &N ); mbedtls_mpi_init( &R );
    mbedtls_ecp_group_init( &grp );

    TEST_ASSERT( mbedtls_test_read_mpi( &N, N_str ) == 0 );
    TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );
    TEST_ASSERT( grp.modp != NULL );

    /*
     * Store correct result before we touch N
     */
    TEST_ASSERT( mbedtls_mpi_mod_mpi( &R, &N, &grp.P ) == 0 );

    TEST_ASSERT( grp.modp( &N ) == 0 );
    TEST_ASSERT( mbedtls_mpi_bitlen( &N ) <= grp.pbits + 3 );

    /*
     * Use mod rather than addition/subtraction in case previous test fails
     */
    TEST_ASSERT( mbedtls_mpi_mod_mpi( &N, &N, &grp.P ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &N, &R ) == 0 );

exit:
    mbedtls_mpi_free( &N ); mbedtls_mpi_free( &R );
    mbedtls_ecp_group_free( &grp );
}
/* END_CASE */

/* BEGIN_CASE */
void ecp_write_binary( int id, char * x, char * y, char * z, int format,
                       data_t * out, int blen, int ret )
{
    mbedtls_ecp_group grp;
    mbedtls_ecp_point P;
    unsigned char buf[256];
    size_t olen;

    memset( buf, 0, sizeof( buf ) );

    mbedtls_ecp_group_init( &grp ); mbedtls_ecp_point_init( &P );

    TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );

    TEST_ASSERT( mbedtls_test_read_mpi( &P.X, x ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &P.Y, y ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &P.Z, z ) == 0 );

    TEST_ASSERT( mbedtls_ecp_point_write_binary( &grp, &P, format,
                                   &olen, buf, blen ) == ret );

    if( ret == 0 )
    {
        TEST_ASSERT( olen <= MBEDTLS_ECP_MAX_PT_LEN );
        TEST_ASSERT( mbedtls_test_hexcmp( buf, out->x, olen, out->len ) == 0 );
    }

exit:
    mbedtls_ecp_group_free( &grp ); mbedtls_ecp_point_free( &P );
}
/* END_CASE */

/* BEGIN_CASE */
void ecp_read_binary( int id, data_t * buf, char * x, char * y, char * z,
                      int ret )
{
    mbedtls_ecp_group grp;
    mbedtls_ecp_point P;
    mbedtls_mpi X, Y, Z;


    mbedtls_ecp_group_init( &grp ); mbedtls_ecp_point_init( &P );
    mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y ); mbedtls_mpi_init( &Z );

    TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );

    TEST_ASSERT( mbedtls_test_read_mpi( &X, x ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &Y, y ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &Z, z ) == 0 );

    TEST_ASSERT( mbedtls_ecp_point_read_binary( &grp, &P, buf->x, buf->len ) == ret );

    if( ret == 0 )
    {
        TEST_ASSERT( mbedtls_mpi_cmp_mpi( &P.X, &X ) == 0 );
        if( mbedtls_ecp_get_type( &grp ) == MBEDTLS_ECP_TYPE_MONTGOMERY )
        {
            TEST_ASSERT( mbedtls_mpi_cmp_int( &Y, 0 ) == 0 );
            TEST_ASSERT( P.Y.p == NULL );
            TEST_ASSERT( mbedtls_mpi_cmp_int( &Z, 1 ) == 0 );
            TEST_ASSERT( mbedtls_mpi_cmp_int( &P.Z, 1 ) == 0 );
        }
        else
        {
            TEST_ASSERT( mbedtls_mpi_cmp_mpi( &P.Y, &Y ) == 0 );
            TEST_ASSERT( mbedtls_mpi_cmp_mpi( &P.Z, &Z ) == 0 );
        }
    }

exit:
    mbedtls_ecp_group_free( &grp ); mbedtls_ecp_point_free( &P );
    mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y ); mbedtls_mpi_free( &Z );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_ecp_tls_read_point( int id, data_t * buf, char * x, char * y,
                                 char * z, int ret )
{
    mbedtls_ecp_group grp;
    mbedtls_ecp_point P;
    mbedtls_mpi X, Y, Z;
    const unsigned char *vbuf = buf->x;


    mbedtls_ecp_group_init( &grp ); mbedtls_ecp_point_init( &P );
    mbedtls_mpi_init( &X ); mbedtls_mpi_init( &Y ); mbedtls_mpi_init( &Z );

    TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );

    TEST_ASSERT( mbedtls_test_read_mpi( &X, x ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &Y, y ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &Z, z ) == 0 );

    TEST_ASSERT( mbedtls_ecp_tls_read_point( &grp, &P, &vbuf, buf->len ) == ret );

    if( ret == 0 )
    {
        TEST_ASSERT( mbedtls_mpi_cmp_mpi( &P.X, &X ) == 0 );
        TEST_ASSERT( mbedtls_mpi_cmp_mpi( &P.Y, &Y ) == 0 );
        TEST_ASSERT( mbedtls_mpi_cmp_mpi( &P.Z, &Z ) == 0 );
        TEST_ASSERT( (uint32_t)( vbuf - buf->x ) == buf->len );
    }

exit:
    mbedtls_ecp_group_free( &grp ); mbedtls_ecp_point_free( &P );
    mbedtls_mpi_free( &X ); mbedtls_mpi_free( &Y ); mbedtls_mpi_free( &Z );
}
/* END_CASE */

/* BEGIN_CASE */
void ecp_tls_write_read_point( int id )
{
    mbedtls_ecp_group grp;
    mbedtls_ecp_point pt;
    unsigned char buf[256];
    const unsigned char *vbuf;
    size_t olen;

    mbedtls_ecp_group_init( &grp );
    mbedtls_ecp_point_init( &pt );

    TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );

    memset( buf, 0x00, sizeof( buf ) ); vbuf = buf;
    TEST_ASSERT( mbedtls_ecp_tls_write_point( &grp, &grp.G,
                    MBEDTLS_ECP_PF_COMPRESSED, &olen, buf, 256 ) == 0 );
    TEST_ASSERT( mbedtls_ecp_tls_read_point( &grp, &pt, &vbuf, olen )
                 == MBEDTLS_ERR_ECP_FEATURE_UNAVAILABLE );
    TEST_ASSERT( vbuf == buf + olen );

    memset( buf, 0x00, sizeof( buf ) ); vbuf = buf;
    TEST_ASSERT( mbedtls_ecp_tls_write_point( &grp, &grp.G,
                    MBEDTLS_ECP_PF_UNCOMPRESSED, &olen, buf, 256 ) == 0 );
    TEST_ASSERT( mbedtls_ecp_tls_read_point( &grp, &pt, &vbuf, olen ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &grp.G.X, &pt.X ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &grp.G.Y, &pt.Y ) == 0 );
    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &grp.G.Z, &pt.Z ) == 0 );
    TEST_ASSERT( vbuf == buf + olen );

    memset( buf, 0x00, sizeof( buf ) ); vbuf = buf;
    TEST_ASSERT( mbedtls_ecp_set_zero( &pt ) == 0 );
    TEST_ASSERT( mbedtls_ecp_tls_write_point( &grp, &pt,
                    MBEDTLS_ECP_PF_COMPRESSED, &olen, buf, 256 ) == 0 );
    TEST_ASSERT( mbedtls_ecp_tls_read_point( &grp, &pt, &vbuf, olen ) == 0 );
    TEST_ASSERT( mbedtls_ecp_is_zero( &pt ) );
    TEST_ASSERT( vbuf == buf + olen );

    memset( buf, 0x00, sizeof( buf ) ); vbuf = buf;
    TEST_ASSERT( mbedtls_ecp_set_zero( &pt ) == 0 );
    TEST_ASSERT( mbedtls_ecp_tls_write_point( &grp, &pt,
                    MBEDTLS_ECP_PF_UNCOMPRESSED, &olen, buf, 256 ) == 0 );
    TEST_ASSERT( mbedtls_ecp_tls_read_point( &grp, &pt, &vbuf, olen ) == 0 );
    TEST_ASSERT( mbedtls_ecp_is_zero( &pt ) );
    TEST_ASSERT( vbuf == buf + olen );

exit:
    mbedtls_ecp_group_free( &grp );
    mbedtls_ecp_point_free( &pt );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_ecp_tls_read_group( data_t * buf, int result, int bits,
                                 int record_len )
{
    mbedtls_ecp_group grp;
    const unsigned char *vbuf = buf->x;
    int ret;

    mbedtls_ecp_group_init( &grp );

    ret = mbedtls_ecp_tls_read_group( &grp, &vbuf, buf->len );

    TEST_ASSERT( ret == result );
    if( ret == 0)
    {
        TEST_ASSERT( mbedtls_mpi_bitlen( &grp.P ) == (size_t) bits );
        TEST_ASSERT( vbuf - buf->x ==  record_len);
    }

exit:
    mbedtls_ecp_group_free( &grp );
}
/* END_CASE */

/* BEGIN_CASE */
void ecp_tls_write_read_group( int id )
{
    mbedtls_ecp_group grp1, grp2;
    unsigned char buf[10];
    const unsigned char *vbuf = buf;
    size_t len;
    int ret;

    mbedtls_ecp_group_init( &grp1 );
    mbedtls_ecp_group_init( &grp2 );
    memset( buf, 0x00, sizeof( buf ) );

    TEST_ASSERT( mbedtls_ecp_group_load( &grp1, id ) == 0 );

    TEST_ASSERT( mbedtls_ecp_tls_write_group( &grp1, &len, buf, 10 ) == 0 );
    ret = mbedtls_ecp_tls_read_group( &grp2, &vbuf, len );
    TEST_ASSERT( ret == 0 );

    if( ret == 0 )
    {
        TEST_ASSERT( mbedtls_mpi_cmp_mpi( &grp1.N, &grp2.N ) == 0 );
        TEST_ASSERT( grp1.id == grp2.id );
    }

exit:
    mbedtls_ecp_group_free( &grp1 );
    mbedtls_ecp_group_free( &grp2 );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_ecp_check_privkey( int id, char * key_hex, int ret )
{
    mbedtls_ecp_group grp;
    mbedtls_mpi d;

    mbedtls_ecp_group_init( &grp );
    mbedtls_mpi_init( &d );

    TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &d, key_hex ) == 0 );

    TEST_ASSERT( mbedtls_ecp_check_privkey( &grp, &d ) == ret );

exit:
    mbedtls_ecp_group_free( &grp );
    mbedtls_mpi_free( &d );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_ecp_check_pub_priv( int id_pub, char * Qx_pub, char * Qy_pub,
                                 int id, char * d, char * Qx, char * Qy,
                                 int ret )
{
    mbedtls_ecp_keypair pub, prv;
    mbedtls_test_rnd_pseudo_info rnd_info;

    mbedtls_ecp_keypair_init( &pub );
    mbedtls_ecp_keypair_init( &prv );
    memset( &rnd_info, 0x00, sizeof( mbedtls_test_rnd_pseudo_info ) );

    if( id_pub != MBEDTLS_ECP_DP_NONE )
        TEST_ASSERT( mbedtls_ecp_group_load( &pub.grp, id_pub ) == 0 );
    TEST_ASSERT( mbedtls_ecp_point_read_string( &pub.Q, 16, Qx_pub, Qy_pub ) == 0 );

    if( id != MBEDTLS_ECP_DP_NONE )
        TEST_ASSERT( mbedtls_ecp_group_load( &prv.grp, id ) == 0 );
    TEST_ASSERT( mbedtls_ecp_point_read_string( &prv.Q, 16, Qx, Qy ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &prv.d, d ) == 0 );

    TEST_ASSERT( mbedtls_ecp_check_pub_priv( &pub, &prv,
                          &mbedtls_test_rnd_pseudo_rand, &rnd_info ) == ret );

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

/* BEGIN_CASE */
void mbedtls_ecp_gen_keypair( int id )
{
    mbedtls_ecp_group grp;
    mbedtls_ecp_point Q;
    mbedtls_mpi d;
    mbedtls_test_rnd_pseudo_info rnd_info;

    mbedtls_ecp_group_init( &grp );
    mbedtls_ecp_point_init( &Q );
    mbedtls_mpi_init( &d );
    memset( &rnd_info, 0x00, sizeof( mbedtls_test_rnd_pseudo_info ) );

    TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );

    TEST_ASSERT( mbedtls_ecp_gen_keypair( &grp, &d, &Q,
                                          &mbedtls_test_rnd_pseudo_rand,
                                          &rnd_info ) == 0 );

    TEST_ASSERT( mbedtls_ecp_check_pubkey( &grp, &Q ) == 0 );
    TEST_ASSERT( mbedtls_ecp_check_privkey( &grp, &d ) == 0 );

exit:
    mbedtls_ecp_group_free( &grp );
    mbedtls_ecp_point_free( &Q );
    mbedtls_mpi_free( &d );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_ecp_gen_key( int id )
{
    mbedtls_ecp_keypair key;
    mbedtls_test_rnd_pseudo_info rnd_info;

    mbedtls_ecp_keypair_init( &key );
    memset( &rnd_info, 0x00, sizeof( mbedtls_test_rnd_pseudo_info ) );

    TEST_ASSERT( mbedtls_ecp_gen_key( id, &key,
                                      &mbedtls_test_rnd_pseudo_rand,
                                      &rnd_info ) == 0 );

    TEST_ASSERT( mbedtls_ecp_check_pubkey( &key.grp, &key.Q ) == 0 );
    TEST_ASSERT( mbedtls_ecp_check_privkey( &key.grp, &key.d ) == 0 );

exit:
    mbedtls_ecp_keypair_free( &key );
}
/* END_CASE */

/* BEGIN_CASE */
void mbedtls_ecp_read_key( int grp_id, data_t* in_key, int expected, int canonical )
{
    int ret = 0;
    mbedtls_ecp_keypair key;
    mbedtls_ecp_keypair key2;

    mbedtls_ecp_keypair_init( &key );
    mbedtls_ecp_keypair_init( &key2 );

    ret = mbedtls_ecp_read_key( grp_id, &key, in_key->x, in_key->len );
    TEST_ASSERT( ret == expected );

    if( expected == 0 )
    {
        ret = mbedtls_ecp_check_privkey( &key.grp, &key.d );
        TEST_ASSERT( ret == 0 );

        if( canonical )
        {
            unsigned char buf[MBEDTLS_ECP_MAX_BYTES];

            ret = mbedtls_ecp_write_key( &key, buf, in_key->len );
            TEST_ASSERT( ret == 0 );

            ASSERT_COMPARE( in_key->x, in_key->len,
                            buf, in_key->len );
        }
        else
        {
            unsigned char export1[MBEDTLS_ECP_MAX_BYTES];
            unsigned char export2[MBEDTLS_ECP_MAX_BYTES];

            ret = mbedtls_ecp_write_key( &key, export1, in_key->len );
            TEST_ASSERT( ret == 0 );

            ret = mbedtls_ecp_read_key( grp_id, &key2, export1, in_key->len );
            TEST_ASSERT( ret == expected );

            ret = mbedtls_ecp_write_key( &key2, export2, in_key->len );
            TEST_ASSERT( ret == 0 );

            ASSERT_COMPARE( export1, in_key->len,
                            export2, in_key->len );
        }
    }

exit:
    mbedtls_ecp_keypair_free( &key );
    mbedtls_ecp_keypair_free( &key2 );
}
/* END_CASE */

/* BEGIN_CASE depends_on:HAVE_FIX_NEGATIVE */
void fix_negative( data_t *N_bin, int c, int bits )
{
    mbedtls_mpi C, M, N;

    mbedtls_mpi_init( &C );
    mbedtls_mpi_init( &M );
    mbedtls_mpi_init( &N );

    /* C = - c * 2^bits (positive since c is negative) */
    TEST_EQUAL( 0, mbedtls_mpi_lset( &C, -c ) );
    TEST_EQUAL( 0, mbedtls_mpi_shift_l( &C, bits ) );

    TEST_EQUAL( 0, mbedtls_mpi_read_binary( &N, N_bin->x, N_bin->len ) );
    TEST_EQUAL( 0, mbedtls_mpi_grow( &N, C.n ) );

    /* M = N - C = - ( C - N ) (expected result of fix_negative) */
    TEST_EQUAL( 0, mbedtls_mpi_sub_mpi( &M, &N, &C ) );

    mbedtls_ecp_fix_negative( &N, c, bits );

    TEST_EQUAL( 0, mbedtls_mpi_cmp_mpi( &N, &M ) );

exit:
    mbedtls_mpi_free( &C );
    mbedtls_mpi_free( &M );
    mbedtls_mpi_free( &N );
}
/* END_CASE */

/* BEGIN_CASE depends_on:MBEDTLS_TEST_HOOKS:MBEDTLS_ECP_MONTGOMERY_ENABLED */
void genkey_mx_known_answer( int bits, data_t *seed, data_t *expected )
{
    mbedtls_test_rnd_buf_info rnd_info;
    mbedtls_mpi d;
    int ret;
    uint8_t *actual = NULL;

    mbedtls_mpi_init( &d );
    rnd_info.buf = seed->x;
    rnd_info.length = seed->len;
    rnd_info.fallback_f_rng = NULL;
    rnd_info.fallback_p_rng = NULL;

    ASSERT_ALLOC( actual, expected->len );

    ret = mbedtls_ecp_gen_privkey_mx( bits, &d,
                                      mbedtls_test_rnd_buffer_rand, &rnd_info );

    if( expected->len == 0 )
    {
        /* Expecting an error (happens if there isn't enough randomness) */
        TEST_ASSERT( ret != 0 );
    }
    else
    {
        TEST_EQUAL( ret, 0 );
        TEST_EQUAL( (size_t) bits + 1, mbedtls_mpi_bitlen( &d ) );
        TEST_EQUAL( 0, mbedtls_mpi_write_binary( &d, actual, expected->len ) );
        /* Test the exact result. This assumes that the output of the
         * RNG is used in a specific way, which is overly constraining.
         * The advantage is that it's easier to test the expected properties
         * of the generated key:
         * - The most significant bit must be at a specific positions
         *   (can be enforced by checking the bit-length).
         * - The least significant bits must have specific values
         *   (can be enforced by checking these bits).
         * - Other bits must be random (by testing with different RNG outputs,
         *   we validate that those bits are indeed influenced by the RNG). */
        ASSERT_COMPARE( expected->x, expected->len,
                        actual, expected->len );
    }

exit:
    mbedtls_free( actual );
    mbedtls_mpi_free( &d );
}
/* END_CASE */

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

/* BEGIN_CASE */
void ecp_export( int id, char * Qx, char * Qy,char * d, int expected_ret, int invalid_grp )
{
    mbedtls_ecp_keypair key;
    mbedtls_ecp_group export_grp;
    mbedtls_mpi export_d;
    mbedtls_ecp_point export_Q;

    mbedtls_ecp_group_init( &export_grp );
    mbedtls_ecp_group_init( &key.grp );
    mbedtls_mpi_init( &export_d );
    mbedtls_ecp_point_init( &export_Q );

    mbedtls_ecp_keypair_init( &key );
    if( invalid_grp == 0 )
        TEST_ASSERT( mbedtls_ecp_group_load( &key.grp, id ) == 0 );
    TEST_ASSERT( mbedtls_ecp_point_read_string( &key.Q, 16, Qx, Qy ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &key.d, d ) == 0 );

    TEST_EQUAL( mbedtls_ecp_export( &key, &export_grp,
                                    &export_d, &export_Q ), expected_ret );

    if( expected_ret == 0 )
    {
        TEST_EQUAL( mbedtls_ecp_point_cmp( &key.Q, &export_Q ), 0 );
        TEST_EQUAL( mbedtls_mpi_cmp_mpi( &key.d, &export_d ), 0 );
        TEST_EQUAL( mbedtls_ecp_group_cmp( &key.grp, &export_grp ), 0 );
    }

exit:
    mbedtls_ecp_keypair_free( &key );
    mbedtls_ecp_group_free( &export_grp );
    mbedtls_mpi_free( &export_d );
    mbedtls_ecp_point_free( &export_Q );
}
/* END_CASE */

/* BEGIN_CASE */
void ecp_check_order( int id, char * expected_order_hex )
{
    mbedtls_ecp_group grp;
    mbedtls_mpi expected_n;

    mbedtls_ecp_group_init( &grp );
    mbedtls_mpi_init( &expected_n );

    TEST_ASSERT( mbedtls_ecp_group_load( &grp, id ) == 0 );
    TEST_ASSERT( mbedtls_test_read_mpi( &expected_n, expected_order_hex ) == 0);

    // check sign bits are well-formed (i.e. 1 or -1) - see #5810
    TEST_ASSERT( grp.N.s == -1 || grp.N.s == 1);
    TEST_ASSERT( expected_n.s == -1 || expected_n.s == 1);

    TEST_ASSERT( mbedtls_mpi_cmp_mpi( &grp.N, &expected_n ) == 0 );

exit:
    mbedtls_ecp_group_free( &grp );
    mbedtls_mpi_free( &expected_n );
}
/* END_CASE */