/******************************************************************************
* FILE:	MD5Calc.h
* Description:
*	MD5 arithmetic calculation interface class.
*
* Modified Code History
* Mark  Date        By          Modification Reason
*******************************************************************************
* 01    2007-6-6    Song-Xiaowen Initial creation.
******************************************************************************/

#if !defined(__MD5_CALC_H__)
#define __MD5_CALC_H__

#include "TypeDef.h"
//#include "osipparser2/osip_md5.h"
#include "osip_md5.h"
#include "str.h"

using namespace std;

#define DIGEST_MD5HEX_LEN           32
#define RANDOM_TAG_LEN              16
#define DIGEST_NONCE_LEN            64
#define MD5_SESSION_KEY_LEN         64
#define MD5_RESPONSE_LEN            64
#define DIGEST_HASH_LEN             16
#define SIP_PRIVATE_KEY             "private key"
#define SIP_REGISTER_NONCE_EXPIRE   6 //6 minute
#define SIP_MAX_CHALLENGES          3 //if failed challenges > 3,means failure
#define SIP_MD5_URL_MAXLEN			128


/**
 * Definition of the Authorization header.
 * @struct osip_authorization
 */
struct rtsp_authorization_t
{
    char auth_type[32];		/**< Authentication Type (Basic or Digest) */
    char username[64];		/**< login */
    char realm[128];		/**< realm (as a quoted-string) */
    char nonce[64];		/**< nonce */
    char uri[128];  		/**< uri */
    char response[64];		/**< response */
    char digest[64];		/**< digest */
    char algorithm[64];		/**< algorithm (optionnal) */
    char cnonce[64];		/**< cnonce (optionnal) */
    char opaque[64];		/**< opaque (optionnal) */
    char message_qop[64];		/**< message_qop (optionnal) */
    char nonce_count[64];		/**< nonce_count (optionnal) */
    char auth_param[64];		/**< other parameters (optionnal) */
};

/* Class for MD5 calculation */
class CMD5Calc
{
public:
	CMD5Calc();
	~CMD5Calc();
	
	inline bool MD5Encode(const char *pSource, char target[DIGEST_MD5HEX_LEN+1]);
	void SIPGenerateNonce(char *pTarget, UINT32 timestamp, const char *pETag);
	inline bool SIPCheckNonceExpire(const char *pszNonce, const char *pETag);
	void DigestCalcHA1
	( 
		char *pszAlg,
		char *pszUserName,
		char *pszRealm,
		char *pszPassword,
		char *pszNonce,
		char *pszCNonce,
		char SessionKey[DIGEST_MD5HEX_LEN+1]
	);
	void DigestCalcResponse
	( 
		char HA1[DIGEST_MD5HEX_LEN+1],          /* H(A1) */
		char *pszNonce,                         /* nonce from server */
		char *pszNonceCount,                    /* 8 hex digits */
		char *pszCNonce,                        /* client nonce */
		char *pszQop,                           /* qop-value: "", "auth", "auth-int" */
		char *pszMethod,                        /* method from the request */
		char *pszDigestUri,                     /* requested URL */
		char HEntity[DIGEST_MD5HEX_LEN+1],      /* H(entity body) if qop="auth-int" */
		char Response[DIGEST_MD5HEX_LEN+1]      /* request-digest or response-digest */
	);
	
	//Random character string operations
	inline UINT32 GenerateRandom(UINT32 i1, UINT32 i2);
	char *GenerateRandomTag(char *pStr);
	
	char *unquote(char* s);
};

/* Reference md5 functions in libosip2 */
typedef osip_MD5_CTX  MD5_CTX;
#define MD5Init   osip_MD5Init
#define MD5Update osip_MD5Update
#define MD5Final  osip_MD5Final

#endif  //#if !defined(__MD5_CALC_H__)