package com.util;import java.security.Key;
import java.security.SecureRandom;import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
/***	DES算法*/
@SuppressWarnings("restriction")
public class DESUtil {private static String CHARSETNAME = "UTF-8";private static String ALGORITHM = "DES";//加密函数public static String getEncryptString(String str,String keyStr) {BASE64Encoder base64encoder = new BASE64Encoder();try {Key key = getKey(keyStr);//按utf-8编码byte[] bytes = str.getBytes(CHARSETNAME);//获取加密对象Cipher cipher = Cipher.getInstance(ALGORITHM);//初始化加密信息cipher.init(Cipher.ENCRYPT_MODE, key);//加密byte[] doFinal = cipher.doFinal(bytes);//byte to encode好的String返回return base64encoder.encode(doFinal);} catch (Exception e) {// TODO: handle exceptionthrow new RuntimeException(e);}}//解密函数public static String getDecryptString(String str,String keyStr) {//接受byte[]并转换成StringBASE64Decoder base64decoder = new BASE64Decoder();try {Key key = getKey(keyStr);//将String变成bytebyte[] 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);//返回解密信息return new String(doFinal, CHARSETNAME);} catch (Exception e) {// TODO: handle exceptionthrow new RuntimeException(e);}}public static Key getKey(String keyStr){Key key;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");//设置密钥种子secureRandom.setSeed(keyStr.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);}return key;}public static void main(String[] args) {System.out.println(getEncryptString("123456","System1_System2_2024"));System.out.println(getDecryptString(getEncryptString("123456","System1_System2_2024"),"System1_System2_2024"));}
}