/*
* HEX( KD ( HEX(H(A1)),
* {
* nonce-value, ":" nc-value, ":",
* cnonce-value, ":", qop-value, ":", HEX(H(A2)) }))
*
* If authzid is specified, then A1 is
*
* A1 = { H( { username-value, ":", realm-value, ":", passwd } ),
* ":", nonce-value, ":", cnonce-value, ":", authzid-value }
*
* If authzid is not specified, then A1 is
*
* A1 = { H( { username-value, ":", realm-value, ":", passwd } ),
* ":", nonce-value, ":", cnonce-value }
*
* where
*
* passwd = *OCTET
*/
internal void GenerateResponse()
{
byte[] H1;
byte[] H2;
byte[] H3;
//byte[] temp;
string A1;
string A2;
string A3;
string p1;
string p2;
var sb = new StringBuilder();
sb.Append(xmppClient.Username);
sb.Append(":");
sb.Append(step1.Realm ?? xmppClient.XmppDomain);
sb.Append(":");
sb.Append(xmppClient.Password);
//H1 = new MD5CryptoServiceProvider().ComputeHash(Encoding.UTF8.GetBytes(sb.ToString()));
H1 = Hash.Md5HashBytes(Encoding.UTF8.GetBytes(sb.ToString()));
#if TEST
var H1hex = Util.Hash.HexToString(H1);
#endif
sb.Remove(0, sb.Length);
sb.Append(":");
sb.Append(step1.Nonce);
sb.Append(":");
sb.Append(Cnonce);
if (Authzid != null)
{
sb.Append(":");
sb.Append(Authzid);
}
A1 = sb.ToString();
byte[] bA1 = Encoding.ASCII.GetBytes(A1);
byte[] bH1A1 = new byte[H1.Length + bA1.Length];
Array.Copy(H1, 0, bH1A1, 0, H1.Length);
Array.Copy(bA1, 0, bH1A1, H1.Length, bA1.Length);
#if TEST
var bH1A1hex = Util.Hash.HexToString(bH1A1);
#endif
//H1 = new MD5CryptoServiceProvider().ComputeHash(bH1A1);
H1 = Hash.Md5HashBytes(bH1A1);
#if TEST
H1hex = Util.Hash.HexToString(H1);
#endif
sb.Remove(0, sb.Length);
/*
* from rfc2831
* If the "qop" directive's value is "auth", then A2 is:
*
* A2 = { "AUTHENTICATE:", digest-uri-value }
*
* If the "qop" value is "auth-int" or "auth-conf" then A2 is:
*
* A2 = { "AUTHENTICATE:", digest-uri-value,
* ":00000000000000000000000000000000" }
*/
sb.Append("AUTHENTICATE:");
sb.Append(DigestUri);
if (step1.Qop != "auth")
{
sb.Append(":00000000000000000000000000000000");
}
A2 = sb.ToString();
H2 = Encoding.ASCII.GetBytes(A2);
//H2 = new MD5CryptoServiceProvider().ComputeHash(H2);
H2 = Hash.Md5HashBytes(H2);
#if TEST
var H2hex = Util.Hash.HexToString(H2);
#endif
// create p1 and p2 as the hex representation of H1 and H2
p1 = H1.ToHex();
p2 = H2.ToHex();
sb.Remove(0, sb.Length);
sb.Append(p1);
sb.Append(":");
sb.Append(step1.Nonce);
sb.Append(":");
sb.Append(Nc);
sb.Append(":");
sb.Append(Cnonce);
sb.Append(":");
sb.Append(step1.Qop);
sb.Append(":");
sb.Append(p2);
A3 = sb.ToString();
H3 = Hash.Md5HashBytes(Encoding.ASCII.GetBytes(A3));
#if TEST
var H3hex = Util.Hash.HexToString(H3);
#endif
Response = H3.ToHex().ToLower();
}