Add libotr/etc sources

1 files changed, 177 insertions, 0 deletions

diff --git a/libotr/libotr-4.1.1/src/auth.h b/libotr/libotr-4.1.1/src/auth.h
new file mode 100644
index 0000000..0b9db54
--- /dev/null
+++ b/libotr/libotr-4.1.1/src/auth.h
@@ -0,0 +1,177 @@
+/*
+ *  Off-the-Record Messaging library
+ *  Copyright (C) 2004-2012  Ian Goldberg, Rob Smits, Chris Alexander,
+ *  			      Willy Lew, Lisa Du, Nikita Borisov
+ *                           <otr@cypherpunks.ca>
+ *
+ *  This library is free software; you can redistribute it and/or
+ *  modify it under the terms of version 2.1 of the GNU Lesser General
+ *  Public License as published by the Free Software Foundation.
+ *
+ *  This library is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *  Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public
+ *  License along with this library; if not, write to the Free Software
+ *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef __AUTH_H__
+#define __AUTH_H__
+
+#include <gcrypt.h>
+#include <time.h>
+#include "dh.h"
+
+
+typedef enum {
+    OTRL_AUTHSTATE_NONE,
+    OTRL_AUTHSTATE_AWAITING_DHKEY,
+    OTRL_AUTHSTATE_AWAITING_REVEALSIG,
+    OTRL_AUTHSTATE_AWAITING_SIG,
+    OTRL_AUTHSTATE_V1_SETUP
+} OtrlAuthState;
+
+typedef struct {
+    OtrlAuthState authstate;              /* Our state */
+
+    struct context *context;              /* The context which points to us */
+
+    DH_keypair our_dh;                    /* Our D-H key */
+    unsigned int our_keyid;               /* ...and its keyid */
+
+    unsigned char *encgx;                 /* The encrypted value of g^x */
+    size_t encgx_len;                     /*  ...and its length */
+    unsigned char r[16];                  /* The encryption key */
+
+    unsigned char hashgx[32];             /* SHA256(g^x) */
+
+    gcry_mpi_t their_pub;                 /* Their D-H public key */
+    unsigned int their_keyid;             /*  ...and its keyid */
+
+
+    gcry_cipher_hd_t enc_c, enc_cp;       /* c and c' encryption keys */
+    gcry_md_hd_t mac_m1, mac_m1p;         /* m1 and m1' MAC keys */
+    gcry_md_hd_t mac_m2, mac_m2p;         /* m2 and m2' MAC keys */
+
+    unsigned char their_fingerprint[20];  /* The fingerprint of their
+					     long-term signing key */
+
+    int initiated;                        /* Did we initiate this
+					     authentication? */
+
+    unsigned int protocol_version;        /* The protocol version number
+					     used to authenticate. */
+
+    unsigned char secure_session_id[20];  /* The secure session id */
+    size_t secure_session_id_len;         /* And its actual length,
+					     which may be either 20 (for
+					     v1) or 8 (for v2) */
+    OtrlSessionIdHalf session_id_half;    /* Which half of the session
+					     id gets shown in bold */
+
+    char *lastauthmsg;                    /* The last auth message
+					     (base-64 encoded) we sent,
+					     in case we need to
+					     retransmit it. */
+
+    time_t commit_sent_time;              /* The time we last sent the
+                                             lastauthmsg, if it was a
+					     COMMIT message, and this is
+					     a master context.  0
+					     otherwise. */
+} OtrlAuthInfo;
+
+#include "privkey-t.h"
+
+/*
+ * Initialize the fields of an OtrlAuthInfo (already allocated).
+ */
+void otrl_auth_new(struct context *context);
+
+/*
+ * Clear the fields of an OtrlAuthInfo (but leave it allocated).
+ */
+void otrl_auth_clear(OtrlAuthInfo *auth);
+
+/*
+ * Start a fresh AKE (version 2 or 3) using the given OtrlAuthInfo.  Generate
+ * a fresh DH keypair to use.  If no error is returned, the message to
+ * transmit will be contained in auth->lastauthmsg.
+ */
+gcry_error_t otrl_auth_start_v23(OtrlAuthInfo *auth, int version);
+
+/*
+ * Handle an incoming D-H Commit Message.  If no error is returned, the
+ * message to send will be left in auth->lastauthmsg.  Generate a fresh
+ * keypair to use.
+ */
+gcry_error_t otrl_auth_handle_commit(OtrlAuthInfo *auth,
+	const char *commitmsg, int version);
+
+/*
+ * Handle an incoming D-H Key Message.  If no error is returned, and
+ * *havemsgp is 1, the message to sent will be left in auth->lastauthmsg.
+ * Use the given private authentication key to sign messages.
+ */
+gcry_error_t otrl_auth_handle_key(OtrlAuthInfo *auth, const char *keymsg,
+	int *havemsgp, OtrlPrivKey *privkey);
+
+/*
+ * Handle an incoming Reveal Signature Message.  If no error is
+ * returned, and *havemsgp is 1, the message to be sent will be left in
+ * auth->lastauthmsg.  Use the given private authentication key to sign
+ * messages.  Call the auth_succeeded callback if authentication is
+ * successful.
+ */
+gcry_error_t otrl_auth_handle_revealsig(OtrlAuthInfo *auth,
+	const char *revealmsg, int *havemsgp, OtrlPrivKey *privkey,
+	gcry_error_t (*auth_succeeded)(const OtrlAuthInfo *auth, void *asdata),
+	void *asdata);
+
+/*
+ * Handle an incoming Signature Message.  If no error is returned, and
+ * *havemsgp is 1, the message to be sent will be left in
+ * auth->lastauthmsg.  Call the auth_succeeded callback if
+ * authentication is successful.
+ */
+gcry_error_t otrl_auth_handle_signature(OtrlAuthInfo *auth,
+	const char *sigmsg, int *havemsgp,
+	gcry_error_t (*auth_succeeded)(const OtrlAuthInfo *auth, void *asdata),
+	void *asdata);
+
+/*
+ * Start a fresh AKE (version 1) using the given OtrlAuthInfo.  If
+ * our_dh is NULL, generate a fresh DH keypair to use.  Otherwise, use a
+ * copy of the one passed (with the given keyid).  Use the given private
+ * key to sign the message.  If no error is returned, the message to
+ * transmit will be contained in auth->lastauthmsg.
+ */
+gcry_error_t otrl_auth_start_v1(OtrlAuthInfo *auth, DH_keypair *our_dh,
+	unsigned int our_keyid, OtrlPrivKey *privkey);
+
+/*
+ * Handle an incoming v1 Key Exchange Message.  If no error is returned,
+ * and *havemsgp is 1, the message to be sent will be left in
+ * auth->lastauthmsg.  Use the given private authentication key to sign
+ * messages.  Call the auth_secceeded callback if authentication is
+ * successful.  If non-NULL, use a copy of the given D-H keypair, with
+ * the given keyid.
+ */
+gcry_error_t otrl_auth_handle_v1_key_exchange(OtrlAuthInfo *auth,
+	const char *keyexchmsg, int *havemsgp, OtrlPrivKey *privkey,
+	DH_keypair *our_dh, unsigned int our_keyid,
+	gcry_error_t (*auth_succeeded)(const OtrlAuthInfo *auth, void *asdata),
+	void *asdata);
+
+/*
+ * Copy relevant information from the master OtrlAuthInfo to an
+ * instance OtrlAuthInfo in response to a D-H Key with a new
+ * instance. The fields copied will depend on the state of the
+ * master auth.
+ */
+void otrl_auth_copy_on_key(OtrlAuthInfo *m_auth, OtrlAuthInfo *auth);
+
+#endif