/*
 * Copyright (C) 2012 Smile Communications, jason.penton@smilecoms.com
 * Copyright (C) 2012 Smile Communications, richard.good@smilecoms.com
 *
 * The initial version of this code was written by Dragos Vingarzan
 * (dragos(dot)vingarzan(at)fokus(dot)fraunhofer(dot)de and the
 * Fruanhofer Institute. It was and still is maintained in a separate
 * branch of the original SER. We are therefore migrating it to
 * Kamailio/SR and look forward to maintaining it from here on out.
 * 2011/2012 Smile Communications, Pty. Ltd.
 * ported/maintained/improved by
 * Jason Penton (jason(dot)penton(at)smilecoms.com and
 * Richard Good (richard(dot)good(at)smilecoms.com) as part of an
 * effort to add full IMS support to Kamailio/SR using a new and
 * improved architecture
 *
 * NB: Alot of this code was originally part of OpenIMSCore,
 * FhG Fokus.
 * Copyright (C) 2004-2006 FhG Fokus
 * Thanks for great work! This is an effort to
 * break apart the various CSCF functions into logically separate
 * components. We hope this will drive wider use. We also feel
 * that in this way the architecture is more complete and thereby easier
 * to manage in the Kamailio/SR environment
 *
 * This file is part of Kamailio, a free SIP server.
 *
 * Kamailio is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version
 *
 * Kamailio 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 *
 */


#ifndef RFC2617_H
#define RFC2617_H

#include "../../core/str.h"


#define HASHLEN 16
typedef char HASH[HASHLEN];


#define HASHHEXLEN 32
typedef char HASHHEX[HASHHEXLEN + 1];


/*
 * Type of algorithm used
 */
typedef enum
{
	HA_MD5,		 /* Plain MD5 */
	HA_MD5_SESS, /* MD5-Session */
} ha_alg_t;


/*
 * Convert to hex form
 */
void cvt_hex(HASH Bin, HASHHEX Hex);


/*
 * calculate H(A1) as per HTTP Digest spec
 */
typedef void (*calc_HA1_t)(ha_alg_t _alg, /* Type of algorithm */
		str *_username,					  /* username */
		str *_realm,					  /* realm */
		str *_password,					  /* password */
		str *_nonce,					  /* nonce string */
		str *_cnonce,					  /* cnonce */
		HASHHEX _sess_key);				  /* Result will be stored here */
void calc_HA1(ha_alg_t _alg,			  /* Type of algorithm */
		str *_username,					  /* username */
		str *_realm,					  /* realm */
		str *_password,					  /* password */
		str *_nonce,					  /* nonce string */
		str *_cnonce,					  /* cnonce */
		HASHHEX _sess_key);				  /* Result will be stored here */

void calc_H(str *ent, HASHHEX hash);

/* calculate request-digest/response-digest as per HTTP Digest spec */
typedef void (*calc_response_t)(HASHHEX _ha1, /* H(A1) */
		str *_nonce,						  /* nonce from server */
		str *_nc,							  /* 8 hex digits */
		str *_cnonce,						  /* client nonce */
		str *_qop,				 /* qop-value: "", "auth", "auth-int" */
		int _auth_int,			 /* 1 if auth-int is used */
		str *_method,			 /* method from the request */
		str *_uri,				 /* requested URL */
		HASHHEX _hentity,		 /* H(entity body) if qop="auth-int" */
		HASHHEX _response);		 /* request-digest or response-digest */
void calc_response(HASHHEX _ha1, /* H(A1) */
		str *_nonce,			 /* nonce from server */
		str *_nc,				 /* 8 hex digits */
		str *_cnonce,			 /* client nonce */
		str *_qop,				 /* qop-value: "", "auth", "auth-int" */
		int _auth_int,			 /* 1 if auth-int is used */
		str *_method,			 /* method from the request */
		str *_uri,				 /* requested URL */
		HASHHEX _hentity,		 /* H(entity body) if qop="auth-int" */
		HASHHEX _response);		 /* request-digest or response-digest */


#endif /* RFC2617_H */
