static int ssl_hs_is_proper_fragment( mbedtls_ssl_context *ssl )
{
    if( ssl->in_msglen < ssl->in_hslen ||
        memcmp( ssl->in_msg + 6, "\0\0\0",        3 ) != 0 ||
        memcmp( ssl->in_msg + 9, ssl->in_msg + 1, 3 ) != 0 )
    {
        return( 1 );
    }
    return( 0 );
}