public static byte[] charstringDecrypt(byte[] buffer,
    int n) 
{
        return decrypt(buffer, 4330, n);
}

Decrypt charstring.

 public static byte[] charstringEncrypt(byte[] buffer,
    int n) 
{
        return encrypt(buffer, 4330, n);
}

Encrypt charstring.

 public static byte[] eexecDecrypt(byte[] buffer) 
{
        return decrypt(buffer, 55665, 4);
}

Decrypt eexec.

 public static byte[] eexecEncrypt(byte[] buffer) 
{
        return encrypt(buffer, 55665, 4);
}

Encrypt eexec.

 public static byte[] hexDecode(String string) 
{
        if (string.length() % 2 != 0)
        {
            throw new IllegalArgumentException();
        }
        byte[] bytes = new byte[string.length() / 2];
        for (int i = 0; i <  string.length(); i += 2)
        {
            bytes[i / 2] = (byte) Integer.parseInt(string.substring(i, i + 2), 16);
        }
        return bytes;
}

Converts a string representing a hex value into a byte array.

 public static String hexEncode(byte[] bytes) 
{
        StringBuilder sb = new StringBuilder();
        for (int i = 0; i <  bytes.length; i++)
        {
            String string = Integer.toHexString(bytes[i] & 0xff);
            if (string.length() == 1)
            {
                sb.append("0");
            }
            sb.append(string.toUpperCase());
        }
        return sb.toString();
}

Converts a byte-array into a string with the corresponding hex value.