DES 工具类

package com.mayikt.main.utils;
import java.security.*;
import javax.crypto.*;/**
* @ClassName: DES
* @Description:DES加解密算法
* @author weny.yang
* @date Mar 25, 2021
*/
public class DES {private static String strDefaultKey = "12345678";    //默认的密钥private Cipher encryptCipher = null;private Cipher decryptCipher = null;/*** 构造函数 DES.使用默认密钥* @throws Exception*/public DES() throws Exception {this(strDefaultKey);}/*** 构造函数 DES.使用指定的密钥* @throws Exception*/public DES(String strKey) throws Exception {Security.addProvider(new com.sun.crypto.provider.SunJCE());Key key = getKey(strKey.getBytes());encryptCipher = Cipher.getInstance("DES");encryptCipher.init(Cipher.ENCRYPT_MODE, key);decryptCipher = Cipher.getInstance("DES");decryptCipher.init(Cipher.DECRYPT_MODE, key);}/*** @Title: encrypt* @Description:加密字符串* @param strIn 需加密的字符串* @return 加密后的字符串* @author weny.yang* @date Mar 25, 2021*/public String encrypt(String strIn) throws Exception {return byteArr2HexStr(encrypt(strIn.getBytes()));}/*** 加密字节数组* @param arrB 需加密的字节数组* @return 加密后的字节数组* @author weny.yang* @date Mar 25, 2021* @throws Exception*/public byte[] encrypt(byte[] arrB) throws Exception {return encryptCipher.doFinal(arrB);}/*** 解密字符串* @param strIn 需解密的字符串* @return 解密后的字符串* @author weny.yang* @date Mar 25, 2021* @throws Exception*/public String decrypt(String strIn) throws Exception {return new String(decrypt(hexStr2ByteArr(strIn)));}/*** 解密字节数组* @param arrB 需解密的字节数组* @return 解密后的字节数组* @author weny.yang* @date Mar 25, 2021* @throws Exception*/public byte[] decrypt(byte[] arrB) throws Exception {return decryptCipher.doFinal(arrB);}/*** 从指定字符串生成密钥，密钥所需的字节数组长度为8位* 不足8位时后面补0，超出8位只取前8位* @param arrBTmp 构成该字符串的字节数组* @return 生成的密钥* @author weny.yang* @date Mar 25, 2021* @throws Exception*/private Key getKey(byte[] arrBTmp) throws Exception {byte[] arrB = new byte[8];for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {arrB[i] = arrBTmp[i];}Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");return key;}/*** 将byte数组转换为表示16进制值的字符串，* 如：byte[]{8,18}转换为：0813，* 和public static byte[] hexStr2ByteArr(String strIn)* 互为可逆的转换过程* @param arrB 需要转换的byte数组* @return 转换后的字符串* @author weny.yang* @date Mar 25, 2021* @throws Exception*/public static String byteArr2HexStr(byte[] arrB) throws Exception {int iLen = arrB.length;StringBuffer sb = new StringBuffer(iLen * 2);for (int i = 0; i < iLen; i++) {int intTmp = arrB[i];while (intTmp < 0) {intTmp = intTmp + 256;}if (intTmp < 16) {sb.append("0");}sb.append(Integer.toString(intTmp, 16));}return sb.toString();}/*** 将表示16进制值的字符串转换为byte数组，* 和public static String byteArr2HexStr(byte[] arrB)* 互为可逆的转换过程* @param strIn 需要转换的字符串* @return 转换后的byte数组* @author weny.yang* @date Mar 25, 2021* @throws Exception*/public static byte[] hexStr2ByteArr(String strIn) throws Exception {byte[] arrB = strIn.getBytes();int iLen = arrB.length;byte[] arrOut = new byte[iLen / 2];for (int i = 0; i < iLen; i = i + 2) {String strTmp = new String(arrB, i, 2);arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);}return arrOut;}
}

package com.mayikt.main.utils;/**
* @ClassName: EncryUtil
* @Description:加密解密工具类
* @author weny.yang
* @date Mar 25, 2021
*/
public class EncryUtil {/*** @Title: encrypt* @Description:使用默认密钥进行DES加密* @author weny.yang* @date Mar 25, 2021*/public static String encrypt(String plainText) {try {return new DES().encrypt(plainText);} catch (Exception e) {return null;}}/*** @Title: encrypt* @Description:使用指定密钥进行DES解密* @author weny.yang* @date Mar 25, 2021*/public static String encrypt(String plainText, String key) {try {return new DES(key).encrypt(plainText);} catch (Exception e) {return null;}}/*** @Title: decrypt* @Description:使用默认密钥进行DES解密* @author weny.yang* @date Mar 25, 2021*/public static String decrypt(String plainText) {try {return new DES().decrypt(plainText);} catch (Exception e) {return null;}}/*** @Title: decrypt* @Description:使用指定密钥进行DES解密* @author weny.yang* @date Mar 25, 2021*/public static String decrypt(String plainText, String key) {try {return new DES(key).decrypt(plainText);} catch (Exception e) {return null;}}}