for ( int i = 0; i < KerberosConstants.CHECKSUM_SIZE; i++ )
                if ( plainDataChecksum[ i ] != data[ i ] )
                    throw new GeneralSecurityException("Checksum failed while decrypting.");

        int decryptLength = plainData.length - KerberosConstants.CONFOUNDER_SIZE;
        decrypt = new byte[decryptLength];

                }
                catch ( GeneralSecurityException e ) {
                    throw new PACDecodingException("Decryption failed " + serverKey.getKeyType(), e);
                }
                break;
            default:
                throw new PACDecodingException("Unrecognized field " + tagged.getTagNo());
            }
        }

    }


    public String getUserPrincipalName () {