* Server version "1.99" means we can choose whether we use v1
     * or v2 protocol. Choice is based on cfg.sshprot.
     */
    if (ssh_versioncmp(version, cfg.sshprot == 1 ? "2.0" : "1.99") >= 0) {
        /*
         * This is a v2 server. Begin v2 protocol.
         */
        char *verstring = "SSH-2.0-PuTTY";
        char verstring[80];
        sprintf(verstring, "SSH-2.0-%s", sshver);
        SHA_Init(&exhashbase);
        /*
         * Hash our version string and their version string.
         */
        sha_string(&exhashbase, verstring, strlen(verstring));
        sha_string(&exhashbase, vstring, strcspn(vstring, "\r\n"));
        sprintf(vstring, "%s\n", verstring);
        sprintf(vlog, "We claim version: %s", verstring);
        logevent(vlog);
        logevent("Using SSH protocol version 2");
        sk_write(s, vstring, strlen(vstring));
        ssh_protocol = ssh2_protocol;
        ssh_version = 2;
        s_rdpkt = ssh2_rdpkt;
    } else {
        /*
         * This is a v1 server. Begin v1 protocol.
         */
        sprintf(vstring, "SSH-%s-PuTTY\n",
                (ssh_versioncmp(version, "1.5") <= 0 ? version : "1.5"));
        sprintf(vstring, "SSH-%s-%s\n",
                (ssh_versioncmp(version, "1.5") <= 0 ? version : "1.5"),
                sshver);
        sprintf(vlog, "We claim version: %s", vstring);
        vlog[strcspn(vlog, "\r\n")] = '\0';
        logevent(vlog);
        logevent("Using SSH protocol version 1");
        sk_write(s, vstring, strlen(vstring));
        ssh_protocol = ssh1_protocol;
        ssh_version = 1;