DES加密

package com.xcx.spots.utils;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import java.security.Key;
import java.security.SecureRandom;

/**

• @Description: DES是一种对称加密算法，所谓对称加密算法即：加密和解密使用相同密钥的算法。

• 用于redis和数据库密码加密

• @Author: liuxiangpeng

• @CreateDate: 2020/4/15 8:53

• @UpdateUser: liuxaingpeng

• @UpdateDate: 2020/4/15 8:53

• @UpdateRemark: 修改内容

• @Version: 1.0
  */
  public class DESUtil {

  private static Key key;
  // 设置密钥key
  private static String KEY_STR = “Ade3M53Hde=we5sVebmeoRT-wegRAA8”;
  private static String CHARSETNAME = “UTF-8”;
  private static String ALGORITHM = “AES”;

  static {
  try {
  // 生成DES算法对象
  KeyGenerator generator = KeyGenerator.getInstance(ALGORITHM);
  // 运用SHA1安全策略
  SecureRandom secureRandom = SecureRandom.getInstance(“SHA1PRNG”);
  // 设置上密钥种子
  secureRandom.setSeed(KEY_STR.getBytes());
  // 初始化基于SHA1的算法对象
  generator.init(secureRandom);
  // 生成密钥对象
  key = generator.generateKey();
  generator = null;
  } catch (Exception e) {
  throw new RuntimeException(e);
  }
  }

  /**

  • 获取加密后的信息
  • @param str
  • @return
    */
    public static String getEncryptString(String str) {
    // 基于BASE64编码，接收byte[]并转换成String
    BASE64Encoder base64encoder = new BASE64Encoder();
    try {
    // 按UTF8编码
    byte[] bytes = str.getBytes(CHARSETNAME);
    // 获取加密对象
    Cipher cipher = Cipher.getInstance(ALGORITHM);
    // 初始化密码信息
    cipher.init(Cipher.ENCRYPT_MODE, key);
    // 加密
    byte[] doFinal = cipher.doFinal(bytes);
    // byte[]to encode好的String并返回
    return base64encoder.encode(doFinal);
    } catch (Exception e) {
    // TODO: handle exception
    throw new RuntimeException(e);
    }
    }

  /**

  • 获取解密之后的信息
  • @param str
  • @return
    */
    public static String getDecryptString(String str) {
    // 基于BASE64编码，接收byte[]并转换成String
    BASE64Decoder base64decoder = new BASE64Decoder();
    try {
    // 将字符串decode成byte[]
    byte[] bytes = base64decoder.decodeBuffer(str);
    // 获取解密对象
    Cipher cipher = Cipher.getInstance(ALGORITHM);
    // 初始化解密信息
    cipher.init(Cipher.DECRYPT_MODE, key);
    // 解密
    byte[] doFinal = cipher.doFinal(bytes);
    // 返回解密之后的信息
    return new String(doFinal, CHARSETNAME);
    } catch (Exception e) {
    // TODO: handle exception
    throw new RuntimeException(e);
    }
    }

  public static void main(String[] args) {
  System.out.println(getEncryptString(“admin”));
  System.out.println(getDecryptString(“zW9S/xxO3mVxqn0/2gchPw==”));
  }

}