tests/suites/test_suite_ecp.function

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

#define ECP_PF_UNKNOWN     -1

#define ECP_PT_RESET( x )           \
    mbedtls_ecp_point_free( x );    \
    mbedtls_ecp_point_init( x );
/* END_HEADER */

/* BEGIN_DEPENDENCIES
 * depends_on:MBEDTLS_ECP_C
 * END_DEPENDENCIES
 */

/* 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 );
}
/* 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_mpi_read_string( &P.X, 16, x_hex ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &P.Y, 16, y_hex ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &P.Z, 16, 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_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 );

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

    TEST_ASSERT( mbedtls_mpi_read_string( &dA, 16, dA_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &xA, 16, xA_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &yA, 16, yA_str ) == 0 );

    TEST_ASSERT( mbedtls_mpi_read_string( &dB, 16, dB_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &xZ, 16, xZ_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &yZ, 16, 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, NULL, NULL, &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, NULL, NULL, &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, NULL, NULL, &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_mpi_read_string( &u1, 16, u1_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &u2, 16, u2_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &xR, 16, xR_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &yR, 16, yR_str ) == 0 );

    TEST_ASSERT( mbedtls_mpi_read_string( &Q.X, 16, xQ_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &Q.Y, 16, 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;
    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( 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_string( &dA, 16, dA_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &xA, 16, xA_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &yA, 16, yA_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &dB, 16, dB_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &xB, 16, xB_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &yB, 16, yB_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &xZ, 16, xZ_str ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &yZ, 16, yZ_str ) == 0 );

    TEST_ASSERT( mbedtls_ecp_mul( &grp, &R, &dA, &grp.G,
                          &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, NULL, NULL ) == 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, NULL, NULL ) == 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,
                          &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;
    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( 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_string( &dA, 16, dA_hex ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &dB, 16, dB_hex ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &xA, 16, xA_hex ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &xB, 16, xB_hex ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &xS, 16, xS_hex ) == 0 );

    TEST_ASSERT( mbedtls_ecp_mul( &grp, &R, &dA, &grp.G,
                          &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,
                          &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, NULL, NULL ) == 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, NULL, NULL ) == 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_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_mpi_read_string( &N, 16, 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_mpi_read_string( &P.X, 16, x ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &P.Y, 16, y ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &P.Z, 16, z ) == 0 );

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

    if( ret == 0 )
    {
        TEST_ASSERT( 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_mpi_read_string( &X, 16, x ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &Y, 16, y ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &Z, 16, 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 );
        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_mpi_read_string( &X, 16, x ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &Y, 16, y ) == 0 );
    TEST_ASSERT( mbedtls_mpi_read_string( &Z, 16, 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_mpi_read_string( &d, 16, 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_ecp_keypair_init( &pub );
    mbedtls_ecp_keypair_init( &prv );

    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_mpi_read_string( &prv.d, 16, d ) == 0 );

    TEST_ASSERT( mbedtls_ecp_check_pub_priv( &pub, &prv ) == 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;
    rnd_pseudo_info rnd_info;

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

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

    TEST_ASSERT( mbedtls_ecp_gen_keypair( &grp, &d, &Q, &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;
    rnd_pseudo_info rnd_info;

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

    TEST_ASSERT( mbedtls_ecp_gen_key( id, &key, &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 depends_on:MBEDTLS_SELF_TEST */
void ecp_selftest(  )
{
    TEST_ASSERT( mbedtls_ecp_self_test( 1 ) == 0 );
}
/* END_CASE */