ShiftCrypt: 2 bit shift.

BitShiftCrypt.java

public class BitShitCrypt {

    public static byte[] encrypt(byte[] data) {
        if (data == null) return null;
        byte r=(byte)0x00;
        for (int i=0;i<data.length;i++) {
            byte lr = (byte)(data[i]&0x03);
            data[i]=(byte)(data[i]>>2 | r);
            r=(byte)(lr<<6);
            if (i+1==data.length) {
                data[0] = (byte)(data[0]|r);
            }
        }
        return data;
    }

    public static byte[] decrypt(byte[] data) {
        if (data == null) return null;
        int mask = 0xc0;
        int r=0x00;
        for (int i=data.length-1;i>=0;i--) {
            int lr = data[i] & mask;
            data[i]=(byte)(data[i]<<2 | r);
            r=lr >> 6;
            if (i==0) {
                data[data.length-1] = (byte)(data[data.length-1]|r);
            }
        }
        return data;
    }

}