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  • 备忘DES简单加密与解密

    package com.ego.util;

    import java.io.IOException;
    import java.security.SecureRandom;

    import javax.crypto.Cipher;
    import javax.crypto.SecretKey;
    import javax.crypto.SecretKeyFactory;
    import javax.crypto.spec.DESKeySpec;

    public class DESUtils {

    private final static String DES = "DES";
    public static void main(String[] args) throws Exception {
        String data = "{'uid':'admin','pwd':'21232f297a57a5a743894a0e4a801fc3'}";
        String key = "20161108";
        String afterEn=encrypt(data, key);
        System.out.println(afterEn);
        System.out.println(decrypt(afterEn, key));
    
    }
     
    /**
     * Description 根据键值进行加密
     * @param data 
     * @param key  加密键byte数组
     * @return
     * @throws Exception
     */
    public static String encrypt(String data, String key) throws Exception {
        byte[] bt = encrypt(data.getBytes(), key.getBytes());
        String strs=byte2hex(bt);
        return strs;
    }
    
    /**
     * Description 根据键值进行解密
     * @param data
     * @param key  加密键byte数组
     * @return
     * @throws IOException
     * @throws Exception
     */
    public static String decrypt(String data, String key)throws Exception{
        if (data == null)
            return null;
        	byte[] buf = hex2byte(data.getBytes());
    		byte[] bt = decrypt(buf,key.getBytes());
    		return new String(bt);
    }
    
    /**
     * Description 根据键值进行加密
     * @param data
     * @param key  加密键byte数组
     * @return
     * @throws Exception
     */
    private static byte[] encrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();
    
        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);
    
        // 创建一个密钥工厂,然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);
    
        // Cipher对象实际完成加密操作
        Cipher cipher = Cipher.getInstance(DES);
    
        // 用密钥初始化Cipher对象
        cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
    
        return cipher.doFinal(data);
    }
     
     
    /**
     * Description 根据键值进行解密
     * @param data
     * @param key  加密键byte数组
     * @return
     * @throws Exception
     */
    private static byte[] decrypt(byte[] data, byte[] key) throws Exception {
        // 生成一个可信任的随机数源
        SecureRandom sr = new SecureRandom();
    
        // 从原始密钥数据创建DESKeySpec对象
        DESKeySpec dks = new DESKeySpec(key);
    
        // 创建一个密钥工厂,然后用它把DESKeySpec转换成SecretKey对象
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance(DES);
        SecretKey securekey = keyFactory.generateSecret(dks);
    
        // Cipher对象实际完成解密操作
        Cipher cipher = Cipher.getInstance(DES);
    
        // 用密钥初始化Cipher对象
        cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
    
        return cipher.doFinal(data);
    }
    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);
            b2[n / 2] = (byte) Integer.parseInt(item, 16);
        }
        return b2;
    }
    
    public static String byte2hex(byte[] b) {
        String hs = "";
        String stmp = "";
    
        for (int n = 0; n < b.length; n++) {
            stmp = (java.lang.Integer.toHexString(b[n] & 0XFF));
            if (stmp.length() == 1)
                hs = hs + "0" + stmp;
            else
                hs = hs + stmp;
        }
        return hs.toUpperCase();
    }
    

    }

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  • 原文地址:https://www.cnblogs.com/antis/p/6051121.html
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