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+/* $OpenBSD: authfd.h,v 1.44 2018/07/12 04:35:25 djm Exp $ */
+
+/*
+ * Author: Tatu Ylonen <ylo@cs.hut.fi>
+ * Copyright (c) 1995 Tatu Ylonen <ylo@cs.hut.fi>, Espoo, Finland
+ * All rights reserved
+ * Functions to interface with the SSH_AUTHENTICATION_FD socket.
+ *
+ * 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".
+ */
+
+#ifndef AUTHFD_H
+#define AUTHFD_H
+
+/* List of identities returned by ssh_fetch_identitylist() */
+struct ssh_identitylist {
+ size_t nkeys;
+ struct sshkey **keys;
+ char **comments;
+};
+
+int ssh_get_authentication_socket(int *fdp);
+void ssh_close_authentication_socket(int sock);
+
+int ssh_lock_agent(int sock, int lock, const char *password);
+int ssh_fetch_identitylist(int sock, struct ssh_identitylist **idlp);
+void ssh_free_identitylist(struct ssh_identitylist *idl);
+int ssh_add_identity_constrained(int sock, const struct sshkey *key,
+ const char *comment, u_int life, u_int confirm, u_int maxsign);
+int ssh_remove_identity(int sock, struct sshkey *key);
+int ssh_update_card(int sock, int add, const char *reader_id,
+ const char *pin, u_int life, u_int confirm);
+int ssh_remove_all_identities(int sock, int version);
+
+int ssh_agent_sign(int sock, const struct sshkey *key,
+ u_char **sigp, size_t *lenp,
+ const u_char *data, size_t datalen, const char *alg, u_int compat);
+
+/* Messages for the authentication agent connection. */
+#define SSH_AGENTC_REQUEST_RSA_IDENTITIES 1
+#define SSH_AGENT_RSA_IDENTITIES_ANSWER 2
+#define SSH_AGENTC_RSA_CHALLENGE 3
+#define SSH_AGENT_RSA_RESPONSE 4
+#define SSH_AGENT_FAILURE 5
+#define SSH_AGENT_SUCCESS 6
+#define SSH_AGENTC_ADD_RSA_IDENTITY 7
+#define SSH_AGENTC_REMOVE_RSA_IDENTITY 8
+#define SSH_AGENTC_REMOVE_ALL_RSA_IDENTITIES 9
+
+/* private OpenSSH extensions for SSH2 */
+#define SSH2_AGENTC_REQUEST_IDENTITIES 11
+#define SSH2_AGENT_IDENTITIES_ANSWER 12
+#define SSH2_AGENTC_SIGN_REQUEST 13
+#define SSH2_AGENT_SIGN_RESPONSE 14
+#define SSH2_AGENTC_ADD_IDENTITY 17
+#define SSH2_AGENTC_REMOVE_IDENTITY 18
+#define SSH2_AGENTC_REMOVE_ALL_IDENTITIES 19
+
+/* smartcard */
+#define SSH_AGENTC_ADD_SMARTCARD_KEY 20
+#define SSH_AGENTC_REMOVE_SMARTCARD_KEY 21
+
+/* lock/unlock the agent */
+#define SSH_AGENTC_LOCK 22
+#define SSH_AGENTC_UNLOCK 23
+
+/* add key with constraints */
+#define SSH_AGENTC_ADD_RSA_ID_CONSTRAINED 24
+#define SSH2_AGENTC_ADD_ID_CONSTRAINED 25
+#define SSH_AGENTC_ADD_SMARTCARD_KEY_CONSTRAINED 26
+
+#define SSH_AGENT_CONSTRAIN_LIFETIME 1
+#define SSH_AGENT_CONSTRAIN_CONFIRM 2
+#define SSH_AGENT_CONSTRAIN_MAXSIGN 3
+
+/* extended failure messages */
+#define SSH2_AGENT_FAILURE 30
+
+/* additional error code for ssh.com's ssh-agent2 */
+#define SSH_COM_AGENT2_FAILURE 102
+
+#define SSH_AGENT_OLD_SIGNATURE 0x01
+#define SSH_AGENT_RSA_SHA2_256 0x02
+#define SSH_AGENT_RSA_SHA2_512 0x04
+
+#endif /* AUTHFD_H */