Algorithms¶

public class Algorithms¶

Describe class Algorithms here. Created: Wed May 4 13:24:03 2005

Author:	Artur Hefczyc

Methods¶

$main¶

public static void $main(String[] args)¶

Describe main method here.

Parameters:	args – a `String[]` value

bytesToHex¶

public static final String bytesToHex(byte[] buff)¶

digest¶

public static final byte[] digest(String id, String secret, String alg)¶

generateDialbackKey¶

public static String generateDialbackKey(String originatingServer, String receivingServer, String secret, String streamID)¶

Calculates dialback key as decribed in XEP-0185 version 1.0. Implemented algorithm (recomended in XEP-0185):

key = HMAC-SHA256
      (
        SHA256(Secret),
        {
          Receiving Server, ' ',
          Originating Server, ' ',
          Stream ID
        }
      )

Parameters:	originatingServer – the hostname of the Originating Server receivingServer – the hostname of the Receiving Server secret – a secret known by the Authoritative Server’s network streamID – the Stream ID generated by the Receiving Server
Returns:	string contains HEX encoded dialback key.

hexDigest¶

public static final String hexDigest(String id, String secret, String alg)¶

This method encodes data using digest algorithm described in JEP-0078 documentation. As a result you have String containing digest data which can be compared with data sent by the user to authenticate him.

Parameters:	id – a `String` value of some ID value like session ID to concatenate with secret word. secret – a `String` value of a secret word shared between entites. alg – a `String` value of algorithm name to use for generating diffest message.
Throws:	NoSuchAlgorithmException – if an error occurs during encoding digest message.
Returns:	a `String` value digest message as defined.

sha256¶

public static String sha256(String data)¶

Calculates SHA-256 hash of given data.

Parameters:	data – data to hash
Returns:	string contains HEX encoded SHA-256 of data.