Support xauth

[kikote300]

Support xauth code

[Shevchik]

Started working on it, altrough no guarantees that it will work on future xAuth versions because xAuth doesn't have a stable API.

[kikote300]

Supported hash algorithms: xAuth,

[kikote300]

package fr.xephi.authme.security.crypts;

import java.security.NoSuchAlgorithmException;

public class XAUTH implements EncryptionMethod {

@Override
public String getHash(String password, String salt)
        throws NoSuchAlgorithmException {
    String hash = getWhirlpool(salt + password).toLowerCase();
    int saltPos = (password.length() >= hash.length() ? hash.length() - 1 : password.length());
    return hash.substring(0, saltPos) + salt + hash.substring(saltPos);
}

@Override
public boolean comparePassword(String hash, String password,
        String playerName) throws NoSuchAlgorithmException {
    int saltPos = (password.length() >= hash.length() ? hash.length() - 1 : password.length());
    String salt = hash.substring(saltPos, saltPos + 12);
    return hash.equals(getHash(password, salt));
}

public static String getWhirlpool(String message) {
    WHIRLPOOL w = new WHIRLPOOL();
    byte[] digest = new byte[WHIRLPOOL.DIGESTBYTES];
    w.NESSIEinit();
    w.NESSIEadd(message);
    w.NESSIEfinalize(digest);
    return WHIRLPOOL.display(digest);
}

}