 */
static int
kex_method_diffie_hellman_group1_sha1_key_exchange(LIBSSH2_SESSION *session,
                                                   key_exchange_state_low_t
                                                   * key_state)
{
    static const unsigned char p_value[128] = {
        0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
        0xC9, 0x0F, 0xDA, 0xA2, 0x21, 0x68, 0xC2, 0x34,
        0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1,
        0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74,
        0x02, 0x0B, 0xBE, 0xA6, 0x3B, 0x13, 0x9B, 0x22,
        0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD,
        0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B,
        0x30, 0x2B, 0x0A, 0x6D, 0xF2, 0x5F, 0x14, 0x37,
        0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45,
        0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6,
        0xF4, 0x4C, 0x42, 0xE9, 0xA6, 0x37, 0xED, 0x6B,
        0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED,
        0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5,
        0xAE, 0x9F, 0x24, 0x11, 0x7C, 0x4B, 0x1F, 0xE6,
        0x49, 0x28, 0x66, 0x51, 0xEC, 0xE6, 0x53, 0x81,
        0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
    };

    int ret;

    if(key_state->state == libssh2_NB_state_idle) {
        /* g == 2 */
        key_state->p = _libssh2_bn_init_from_bin();      /* SSH2 defined value (p_value) */
        key_state->g = _libssh2_bn_init();      /* SSH2 defined value (2) */

        /* Initialize P and G */
        _libssh2_bn_set_word(key_state->g, 2);
        _libssh2_bn_from_bin(key_state->p, 128, p_value);

        _libssh2_debug(session, LIBSSH2_TRACE_KEX,
                       "Initiating Diffie-Hellman Group1 Key Exchange");

        key_state->state = libssh2_NB_state_created;
    }
    ret = diffie_hellman_sha1(session, key_state->g, key_state->p, 128,
                              SSH_MSG_KEXDH_INIT, SSH_MSG_KEXDH_REPLY,
                              NULL, 0, &key_state->exchange_state);
    if(ret == LIBSSH2_ERROR_EAGAIN) {
        return ret;
    }

    _libssh2_bn_free(key_state->p);
    key_state->p = NULL;
    _libssh2_bn_free(key_state->g);
    key_state->g = NULL;
    key_state->state = libssh2_NB_state_idle;

 */
static int
kex_method_diffie_hellman_group1_sha1_key_exchange(LIBSSH2_SESSION *session,
                                                   key_exchange_state_low_t
                                                   * key_state)
{
    static const unsigned char p_value[128] = {
        0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
        0xC9, 0x0F, 0xDA, 0xA2, 0x21, 0x68, 0xC2, 0x34,
        0xC4, 0xC6, 0x62, 0x8B, 0x80, 0xDC, 0x1C, 0xD1,
        0x29, 0x02, 0x4E, 0x08, 0x8A, 0x67, 0xCC, 0x74,
        0x02, 0x0B, 0xBE, 0xA6, 0x3B, 0x13, 0x9B, 0x22,
        0x51, 0x4A, 0x08, 0x79, 0x8E, 0x34, 0x04, 0xDD,
        0xEF, 0x95, 0x19, 0xB3, 0xCD, 0x3A, 0x43, 0x1B,
        0x30, 0x2B, 0x0A, 0x6D, 0xF2, 0x5F, 0x14, 0x37,
        0x4F, 0xE1, 0x35, 0x6D, 0x6D, 0x51, 0xC2, 0x45,
        0xE4, 0x85, 0xB5, 0x76, 0x62, 0x5E, 0x7E, 0xC6,
        0xF4, 0x4C, 0x42, 0xE9, 0xA6, 0x37, 0xED, 0x6B,
        0x0B, 0xFF, 0x5C, 0xB6, 0xF4, 0x06, 0xB7, 0xED,
        0xEE, 0x38, 0x6B, 0xFB, 0x5A, 0x89, 0x9F, 0xA5,
        0xAE, 0x9F, 0x24, 0x11, 0x7C, 0x4B, 0x1F, 0xE6,
        0x49, 0x28, 0x66, 0x51, 0xEC, 0xE6, 0x53, 0x81,
        0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF
    };

    int ret;

    if(key_state->state == libssh2_NB_state_idle) {
         
        key_state->p = _libssh2_bn_init_from_bin();       
        key_state->g = _libssh2_bn_init();       

         
        _libssh2_bn_set_word(key_state->g, 2);
        _libssh2_bn_from_bin(key_state->p, 128, p_value);

        _libssh2_debug(session, LIBSSH2_TRACE_KEX,
                       "Initiating Diffie-Hellman Group1 Key Exchange");

        key_state->state = libssh2_NB_state_created;
    }
    ret = diffie_hellman_sha1(session, key_state->g, key_state->p, 128,
                              SSH_MSG_KEXDH_INIT, SSH_MSG_KEXDH_REPLY,
                              NULL, 0, &key_state->exchange_state);
    if(ret == LIBSSH2_ERROR_EAGAIN) {
        return ret;
    }

    _libssh2_bn_free(key_state->p);
    key_state->p = NULL;
    _libssh2_bn_free(key_state->g);
    key_state->g = NULL;
    key_state->state = libssh2_NB_state_idle;
