SIPSorcery.SIP.HTTPDigest.DigestCalcResponse C# (CSharp) Method

        public static string DigestCalcResponse(
			string algorithm,
			string username,
			string realm,
			string password,
			string uri,		
			string nonce,
			string nonceCount,
			string cnonce,
			string qop,			// qop-value: "", "auth", "auth-int".
			string method,
			string digestURL,
			string hEntity
			)
        {
            string HA1 = DigestCalcHA1(username, realm, password);
            string HA2 = DigestCalcHA2(method, uri);

            string unhashedDigest= null;
            if (nonceCount != null && cnonce != null && qop != null)
            {
                unhashedDigest = String.Format("{0}:{1}:{2}:{3}:{4}:{5}",
                HA1,
                nonce,
                nonceCount,
                cnonce,
                qop,
                HA2);
            }
            else
            {
                unhashedDigest = String.Format("{0}:{1}:{2}",
                HA1,
                nonce,
                HA2);
            }

            return GetMD5HashBinHex(unhashedDigest);
        }

        public string GetDigest()
        {
            // Just to make things difficult For some authorisation requests the header changes when the authenticated response is generated.
            if (AuthorisationType == SIPAuthorisationHeadersEnum.ProxyAuthenticate)
            {
                AuthorisationResponseType = SIPAuthorisationHeadersEnum.ProxyAuthorization;
            }
            else if (AuthorisationType == SIPAuthorisationHeadersEnum.WWWAuthenticate)
            {
                AuthorisationResponseType = SIPAuthorisationHeadersEnum.Authorize;
            }

            // If the authorisation header has specified quality of protection equal to "auth" a client nonce needs to be supplied.
            string nonceCountStr = null;

            if (Qop == QOP_AUTHENTICATION_VALUE)
            {
                NonceCount    = (NonceCount != 0) ? NonceCount : NONCE_DEFAULT_COUNT;
                nonceCountStr = GetPaddedNonceCount(NonceCount);

                if (Cnonce == null || Cnonce.Trim().Length == 0)
                {
                    Cnonce = Crypto.GetRandomInt().ToString();
                }
            }

            if (Nonce == null)
            {
                Nonce = Crypto.GetRandomString(12);
            }

            if (Password != null)
            {
                return(HTTPDigest.DigestCalcResponse(
                           Username,
                           Realm,
                           Password,
                           URI,
                           Nonce,
                           nonceCountStr,
                           Cnonce,
                           Qop,
                           RequestType,
                           DigestAlgorithm));
            }
            else if (HA1 != null)
            {
                return(HTTPDigest.DigestCalcResponse(
                           HA1,
                           URI,
                           Nonce,
                           nonceCountStr,
                           Cnonce,
                           Qop,
                           RequestType,
                           DigestAlgorithm));
            }
            else
            {
                throw new ApplicationException("SIP authorisation digest cannot be calculated. No password or HA1 available.");
            }
        }