/**
* The server is challenging the SASL mechanism for the stanza he just sent. Send a response to
* the server's challenge.
*
* @param challengeString a base64 encoded string representing the challenge.
* @param finalChallenge true if this is the last challenge send by the server within the success
* stanza
* @throws NotConnectedException
* @throws SmackException
*/
public final void challengeReceived(String challengeString, boolean finalChallenge)
throws SmackException, NotConnectedException {
byte[] challenge = Base64.decode(challengeString);
byte[] response = evaluateChallenge(challenge);
if (finalChallenge) {
return;
}
Response responseStanza;
if (response == null) {
responseStanza = new Response();
} else {
responseStanza = new Response(Base64.encodeToString(response));
}
// Send the authentication to the server
connection.send(responseStanza);
}
/**
* @param value
* @return hasded value using hash method.
*/
public String getHashedValue(String value) {
try {
MessageDigest md = MessageDigest.getInstance(hash.toUpperCase());
byte[] digest = md.digest(value.getBytes());
return Base64.encodeToString(digest);
} catch (NoSuchAlgorithmException nsae) {
return null;
}
}
private final void authenticate() throws SmackException, NotConnectedException {
byte[] authenticationBytes = getAuthenticationText();
String authenticationText;
// Some SASL mechanisms do return an empty array (e.g. EXTERNAL from javax), so check that
// the array is not-empty. Mechanisms are allowed to return either 'null' or an empty array
// if there is no authentication text.
if (authenticationBytes != null && authenticationBytes.length > 0) {
authenticationText = Base64.encodeToString(authenticationBytes);
} else {
// RFC6120 6.4.2 "If the initiating entity needs to send a zero-length initial response,
// it MUST transmit the response as a single equals sign character ("="), which
// indicates that the response is present but contains no data."
authenticationText = "=";
}
// Send the authentication to the server
connection.send(new AuthMechanism(getName(), authenticationText));
}
