java 加解密工具类

 

import com.seeyon.ctp.util.UUIDLong;
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import java.security.MessageDigest;
import java.security.SecureRandom;
import java.util.Calendar;

public class DesUtil  {
    /**
     * encrypt(des加密，key为任意值做MD5加密)
     * @param key
     * @param text
     * @return
     * @throws Exception
     */
    public static String encrypt(String key,String text) throws Exception {
        MessageDigest md5 = MessageDigest.getInstance("md5");
        SecureRandom random = new SecureRandom();
        DESKeySpec keySpec = new DESKeySpec(md5.digest(key.getBytes("utf-8")));
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("des");
        SecretKey secretKey = keyFactory.generateSecret(keySpec);

        Cipher cipher = Cipher.getInstance("des");
        cipher.init(Cipher.ENCRYPT_MODE, secretKey, random);
        byte[] cipherData = cipher.doFinal(text.getBytes());
        return new BASE64Encoder().encode(cipherData);
    }

    /**
     * encrypt(des解密，key为任意值做MD5加密)
     * @param key
     * @param text
     * @return
     * @throws Exception
     */
    public static String decrypt(String key,String text) throws Exception {
        byte[] cipherData =  new BASE64Decoder().decodeBuffer(text);
        MessageDigest md5 = MessageDigest.getInstance("md5");
        SecureRandom random = new SecureRandom();
        DESKeySpec keySpec = new DESKeySpec(md5.digest(key.getBytes("utf-8")));
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("des");
        SecretKey secretKey = keyFactory.generateSecret(keySpec);

        Cipher cipher = Cipher.getInstance("des");
        cipher.init(Cipher.DECRYPT_MODE, secretKey, random);
        byte[] plainData = cipher.doFinal(cipherData);
        return new String(plainData,"Utf-8");
    }

   
}