java中DES加密解密

java中DES加密解密

废话不多说，直接奉上代码：

复制代码 代码如下:

package com.eabax.plugin.yundada.utils;

import java.io.IOException;

import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

import java.security.SecureRandom;

import java.security.spec.InvalidKeySpecException;

import javax.crypto.BadPaddingException;

import javax.crypto.Cipher;

import javax.crypto.IllegalBlockSizeException;

import javax.crypto.NoSuchPaddingException;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESKeySpec;

import org.apache.commons.codec.binary.Base64;

import sun.misc.BASE64Decoder;

public class DESEncryptHelper {

    private final static String DES = "DES";

    /**

     * 生成密钥

     * @param employeeCode

     */

    public static String getDESKey(String encryptStr){

        if (!CacheManager.getCache().containsKey("encryptKey_"+encryptStr)) {

            CacheManager.getCache().put("encryptKey_"+encryptStr, encryptStr+"tablemiyaokey");

        }

        String key = (String) CacheManager.getCache().get("encryptKey_"+encryptStr);

        return key;

    }

     /**

     * 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 IOException,

            Exception {

        if (data == null)

            return null;

        BASE64Decoder decoder = new BASE64Decoder();

        byte[] buf = decoder.decodeBuffer(data);

        byte[] bt = decrypt(buf,key.getBytes());

     &nbspsvLnL;  return new String(bt);

    }

    /**

     * 对字符串加密

     * @param str

     * @return

     * @throws InvalidKeyException

     * @throws IllegalBlockSizeException

     * @throws BadPaddingException

     * @throws InvalidKeySpecException

     * @throws NoSuchAlgorithmException

     * @throws NoSuchPaddingException

     */

    public static String getEncryptStr(String str,String encryptStr) throws InvalidKeyException,

            IllegalBlockSizeException, BadPaddingException,

            InvalidKeySpecException, NoSuchAlgorithmException,

            NoSuchPaddingException {

        //获取key

        String key = getDESKey(encryptStr);

        //获取密钥

        SecretKeyFactory factory = SecretKeyFactory.getInstance("DES");

        DESKeySpec keyspec = new DESKeySpec(key.getBytes());

        SecretKey deskey = factory.generateSecret(keyspec);

        // Cipher负责完成加密或解密工作

        Cipher c = Cipher.getInstance("DES");

        // 根据密钥，对Cipher对象进行初始化，DECRYPT_MODE表示加密模式 

        c.init(Cipher.ENCRYPT_MODE, deskey);

        byte[] src = str.getBytes();

        // 该字节数组负责保存加密的结果

        byte[] cipherByte = c.doFinal(src);

        String enstr = new String(Base64.encodeBase64(cipherByte));

        return enstr;

    }

     /**

     * 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);

    }

}

以上就是本文关于DES加密解密的代码了，希望对大家学习java有所帮助。

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