DES url加解密

最新推荐文章于 2024-10-21 07:11:12 发布

原创最新推荐文章于 2024-10-21 07:11:12 发布 · 311 阅读

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CC 4.0 BY-SA版权

本文介绍了一种使用Java实现的DES加密算法，包括生成密钥、加密和解密过程。通过具体示例展示了如何对字符串进行加密和解密操作。

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package e.administrator.lib;
import java.security.Key;
import java.security.SecureRandom;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
public class Arithmetic {
    static Key key;

    /**
     * 根据参数生成KEY
     *
     * @param strKey
     */
    public static void getKey(String strKey) {
        try {
            KeyGenerator _generator = KeyGenerator.getInstance("DES");
            _generator.init(new SecureRandom(strKey.getBytes()));
            key = _generator.generateKey();
            _generator = null;
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    /**
     * 加密String明文输入,String密文输出
     *
     * @param strMing
     * @return
     */
    public static String getEncString(String strMing) {
        byte[] byteMi = null;
        byte[] byteMing = null;
        String strMi = "";
        try {
            return byte2hex(getEncCode(strMing.getBytes()));

            // byteMing = strMing.getBytes("UTF8");
            // byteMi = this.getEncCode(byteMing);
            // strMi = new String( byteMi,"UTF8");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            byteMing = null;
            byteMi = null;
        }
        return strMi;
    }

    /**
     * 解密 以String密文输入,String明文输出
     *
     * @param strMi
     * @return
     */
    public static String getDesString(String strMi) {
        byte[] byteMing = null;
        byte[] byteMi = null;
        String strMing = "";
        try {
            return new String(getDesCode(hex2byte(strMi.getBytes())));

            // byteMing = this.getDesCode(byteMi);
            // strMing = new String(byteMing,"UTF8");
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            byteMing = null;
            byteMi = null;
        }
        return strMing;
    }

    /**
     * 加密以byte[]明文输入,byte[]密文输出
     *
     * @param byteS
     * @return
     */
    private static byte[] getEncCode(byte[] byteS) {
        byte[] byteFina = null;
        Cipher cipher;
        try {
            cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.ENCRYPT_MODE, key);
            byteFina = cipher.doFinal(byteS);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            cipher = null;
        }
        return byteFina;
    }

    /**
     * 解密以byte[]密文输入,以byte[]明文输出
     *
     * @param byteD
     * @return
     */
    private static byte[] getDesCode(byte[] byteD) {
        Cipher cipher;
        byte[] byteFina = null;
        try {
            cipher = Cipher.getInstance("DES");
            cipher.init(Cipher.DECRYPT_MODE, key);
            byteFina = cipher.doFinal(byteD);
        } catch (Exception e) {
            e.printStackTrace();
        } finally {
            cipher = null;
        }
        return byteFina;
    }

    /**
     * 二行制转字符串
     *
     * @param b
     * @return
     */
    public static String byte2hex(byte[] b) { // 一个字节的数，
        // 转成16进制字符串
        String hs = "";
        String stmp = "";
        for (int n = 0; n < b.length; n++) {
            // 整数转成十六进制表示
            stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
            if (stmp.length() == 1)
                hs = hs + "0" + stmp;
            else
                hs = hs + stmp;
        }
        return hs.toUpperCase(); // 转成大写
    }

    public static byte[] hex2byte(byte[] b) {
        if ((b.length % 2) != 0)
            throw new IllegalArgumentException("长度不是偶数");
        byte[] b2 = new byte[b.length / 2];
        for (int n = 0; n < b.length; n += 2) {
            String item = new String(b, n, 2);
            // 两位一组，表示一个字节,把这样表示的16进制字符串，还原成一个进制字节
            b2[n / 2] = (byte) Integer.parseInt(item, 16);
        }

        return b2;
    }

    public static void main(String[] args) {
        Arithmetic des = new Arithmetic();// 实例化一个对像
        des.getKey("aadd");// 生成密匙

        String strEnc = des.getEncString("http://47.104.140.194:8080/login");// 加密字符串,返回String的密文
        System.out.println(strEnc);

        String strDes = des.getDesString(strEnc);// 把String 类型的密文解密
        System.out.println(strDes);
    }

}