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+/* $OpenBSD: ssh.h,v 1.88 2018/06/06 18:29:18 markus Exp $ */
+
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ *
+ * As far as I am concerned, the code I have written for this software
+ * can be used freely for any purpose. Any derived versions of this
+ * software must be clearly marked as such, and if the derived work is
+ * incompatible with the protocol description in the RFC file, it must be
+ * called by a name other than "ssh" or "Secure Shell".
+ */
+
+/* Cipher used for encrypting authentication files. */
+#define SSH_AUTHFILE_CIPHER SSH_CIPHER_3DES
+
+/* Default port number. */
+#define SSH_DEFAULT_PORT 22
+
+/*
+ * Maximum number of certificate files that can be specified
+ * in configuration files or on the command line.
+ */
+#define SSH_MAX_CERTIFICATE_FILES 100
+
+/*
+ * Maximum number of RSA authentication identity files that can be specified
+ * in configuration files or on the command line.
+ */
+#define SSH_MAX_IDENTITY_FILES 100
+
+/*
+ * Major protocol version. Different version indicates major incompatibility
+ * that prevents communication.
+ *
+ * Minor protocol version. Different version indicates minor incompatibility
+ * that does not prevent interoperation.
+ */
+#define PROTOCOL_MAJOR_1 1
+#define PROTOCOL_MINOR_1 5
+
+/* We support only SSH2 */
+#define PROTOCOL_MAJOR_2 2
+#define PROTOCOL_MINOR_2 0
+
+/*
+ * Name for the service. The port named by this service overrides the
+ * default port if present.
+ */
+#define SSH_SERVICE_NAME "ssh"
+
+/*
+ * Name of the environment variable containing the process ID of the
+ * authentication agent.
+ */
+#define SSH_AGENTPID_ENV_NAME "SSH_AGENT_PID"
+
+/*
+ * Name of the environment variable containing the pathname of the
+ * authentication socket.
+ */
+#define SSH_AUTHSOCKET_ENV_NAME "SSH_AUTH_SOCK"
+
+/*
+ * Environment variable for overwriting the default location of askpass
+ */
+#define SSH_ASKPASS_ENV "SSH_ASKPASS"
+
+/*
+ * Force host key length and server key length to differ by at least this
+ * many bits. This is to make double encryption with rsaref work.
+ */
+#define SSH_KEY_BITS_RESERVED 128
+
+/*
+ * Length of the session key in bytes. (Specified as 256 bits in the
+ * protocol.)
+ */
+#define SSH_SESSION_KEY_LENGTH 32
+
+/* Used to identify ``EscapeChar none'' */
+#define SSH_ESCAPECHAR_NONE -2
+
+/*
+ * unprivileged user when UsePrivilegeSeparation=yes;
+ * sshd will change its privileges to this user and its
+ * primary group.
+ */
+#ifndef SSH_PRIVSEP_USER
+#define SSH_PRIVSEP_USER "sshd"
+#endif
+
+/* Listen backlog for sshd, ssh-agent and forwarding sockets */
+#define SSH_LISTEN_BACKLOG 128