#define SSH2_MSG_CHANNEL_SUCCESS                  99	/* 0x63 */
#define SSH2_MSG_CHANNEL_FAILURE                  100	/* 0x64 */

/*
 * Packet type contexts, so that ssh2_pkt_type can correctly decode
 * the ambiguous type numbers back into the correct type strings.
 */
#define SSH2_PKTCTX_DHGROUP          0x0001
#define SSH2_PKTCTX_DHGEX            0x0002
#define SSH2_PKTCTX_PUBLICKEY        0x0010
#define SSH2_PKTCTX_PASSWORD         0x0020
#define SSH2_PKTCTX_KBDINTER         0x0040
#define SSH2_PKTCTX_AUTH_MASK        0x00F0

#define SSH2_DISCONNECT_HOST_NOT_ALLOWED_TO_CONNECT 1	/* 0x1 */

    translate(SSH2_MSG_IGNORE);
    translate(SSH2_MSG_UNIMPLEMENTED);
    translate(SSH2_MSG_DEBUG);
    translate(SSH2_MSG_SERVICE_REQUEST);
    translate(SSH2_MSG_SERVICE_ACCEPT);
    translate(SSH2_MSG_KEXINIT);
    translate(SSH2_MSG_NEWKEYS);
    translatec(SSH2_MSG_KEXDH_INIT, SSH2_PKTCTX_DHGROUP);
    translatec(SSH2_MSG_KEXDH_REPLY, SSH2_PKTCTX_DHGROUP);
    translatec(SSH2_MSG_KEX_DH_GEX_REQUEST, SSH2_PKTCTX_DHGEX);
    translatec(SSH2_MSG_KEX_DH_GEX_GROUP, SSH2_PKTCTX_DHGEX);
    translatec(SSH2_MSG_KEX_DH_GEX_INIT, SSH2_PKTCTX_DHGEX);
    translatec(SSH2_MSG_KEX_DH_GEX_REPLY, SSH2_PKTCTX_DHGEX);
    translate(SSH2_MSG_USERAUTH_REQUEST);
    translate(SSH2_MSG_USERAUTH_FAILURE);
    translate(SSH2_MSG_USERAUTH_SUCCESS);

#define SSH1_BUFFER_LIMIT 32768
#define SSH_MAX_BACKLOG 32768
#define OUR_V2_WINSIZE 16384

const static struct ssh_kex *kex_algs[] = {
    &ssh_diffiehellman_gex,
    &ssh_diffiehellman_group14,
    &ssh_diffiehellman_group1,
};

const static struct ssh_signkey *hostkey_algs[] = { &ssh_rsa, &ssh_dss };

static void *nullmac_make_context(void)
{
    return NULL;

    if (s->nbits > 160)
	s->nbits = 160;

    /*
     * If we're doing Diffie-Hellman group exchange, start by
     * requesting a group.
     */
    if (!ssh->kex->pdata) {
	logevent("Doing Diffie-Hellman group exchange");
	ssh->pkt_ctx |= SSH2_PKTCTX_DHGEX;
	/*
	 * Work out how big a DH group we will need to allow that
	 * much data.
	 */
	s->pbits = 512 << ((s->nbits - 1) / 64);

	}
	s->p = ssh2_pkt_getmp(pktin);
	s->g = ssh2_pkt_getmp(pktin);
	if (!s->p || !s->g) {
	    bombout(("unable to read mp-ints from incoming group packet"));
	    crStop(0);
	}
	ssh->kex_ctx = dh_setup_gex(s->p, s->g);
	s->kex_init_value = SSH2_MSG_KEX_DH_GEX_INIT;
	s->kex_reply_value = SSH2_MSG_KEX_DH_GEX_REPLY;
    } else {
	ssh->pkt_ctx |= SSH2_PKTCTX_DHGROUP;
	ssh->kex_ctx = dh_setup_group(ssh->kex);
	s->kex_init_value = SSH2_MSG_KEXDH_INIT;
	s->kex_reply_value = SSH2_MSG_KEXDH_REPLY;
	logeventf(ssh, "Using Diffie-Hellman with standard group \"%s\"",
		  ssh->kex->groupname);
    }

    logevent("Doing Diffie-Hellman key exchange");
    /*
     * Now generate and send e for Diffie-Hellman.
     */
    s->e = dh_create_e(ssh->kex_ctx, s->nbits * 2);