Java实现异或加密

    /**
     * 异或加密
     *
     * @param strOld
     *            源字符串
     * @param strKey
     *            密钥
     * @return 加密后的字符串
     */
    public static String encrypt(String strOld, String strKey) {
        byte[] data = strOld.getBytes();
        byte[] keyData = strKey.getBytes();
        int keyIndex = 0;
        for (int i = 0; i < strOld.length(); i++) {
            data[ i] = ( byte) ( data[ i] ^ keyData[ keyIndex]);
            if (++ keyIndex == keyData. length) {
                keyIndex = 0;
            }
        }
        return new String(data);
    }