异或加密解密字符串

异或加密字符串

/**
 * @Description 加密版本号（与“EtopliveVersion”密钥做异或运算）
 * @Author wangli
 * @Date 2020/9/5 15:04
 **/
public class XORCrypto {
    private byte[] keyBytes; // 密钥
    private int k;

    public XORCrypto(String key) {
        keyBytes = key.getBytes();
        k = keyBytes.length;
    }

    private String coding(String message) {
        byte[] origin = message.getBytes();
        byte[] master = new byte[origin.length];
        for (int i = 0, len = origin.length; i < len; i++) {
            master[i] = (byte) (origin[i] ^ keyBytes[i % k]);
        }
        return new String(master);
    }

    public String encoding(String plaintext) {
        return coding(plaintext);
    }

    public String decoding(String cipherText) {
        return coding(cipherText);
    }

    public static void main(String[] args) throws Exception {
        String name = "V2.1.2.200526";//加密字符串
        String key = "EtopliveVersion";//异或字符串秘钥

        XORCrypto crypto = new XORCrypto(key);
        String cipherText = crypto.encoding(name); // 将name加密成密文
        String plaintext = crypto.decoding(cipherText); // 解密
        System.out.println(cipherText);
        System.out.println(plaintext);

        InputStream in = null;
        OutputStream out = null;

        try {
            out = new BufferedOutputStream(new FileOutputStream(new File("D:\\version.txt")), 10240);//将加密内容写到本地文件

            int b = -1;
            long i = 0;

            // OutputStream out = new FileOutputStream("/storage/sdcard0/aaa");
            InputStream is = new ByteArrayInputStream(cipherText.getBytes());
            byte[] buff = new byte[1024];
            int len = 0;
            while((len=is.read(buff))!=-1){
                out.write(buff, 0, len);
            }
            is.close();
            out.close();


        } finally {
            close(in);
            close(out);
        }

    }
    private static void close(Closeable c) {
        if (c != null) {
            try {
                c.close();
            } catch (IOException e) {
                // nothing
            }
        }
    }
}

本文地址：https://blog.csdn.net/weixin_44305208/article/details/111994172