基于java类库的3DES加密算法实现

加密部分的核心
Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, deskey);
return cipher.doFinal(data);

解密部分的核心
Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE,deskey);
return cipher.doFinal(data);

package DES;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

public class ThreeDESUtil {

//key 根据实际情况对应的修改
private final byte[] keybyte="123456788765432112345678".getBytes(); //keybyte为加密密钥，长度为24字节
private static final String Algorithm = "DESede"; //定义 加密算法,可用 DES,DESede,Blowfish
private SecretKey deskey;
//生成密钥
public ThreeDESUtil(){
deskey = new SecretKeySpec(keybyte, Algorithm);
}
//加密
public byte[] encrypt(byte[] data){
try {
Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, deskey);
return cipher.doFinal(data);
} catch (Exception ex) {
//加密失败，打日志
ex.printStackTrace();
}
return null;
}
//解密
public byte[] decrypt(byte[] data){
try {
Cipher cipher = Cipher.getInstance("DESede/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE,deskey);
return cipher.doFinal(data);
} catch (Exception ex) {
//解密失败，打日志
ex.printStackTrace();
}
return null;
}

public static void main(String[] args) throws Exception {
ThreeDESUtil des=new ThreeDESUtil();
String req ="cryptology";

String toreq  = toHexString(req);
System.err.println("十六进制报文=="+toreq);
byte[] srcData=req.toString().getBytes("utf-8");
byte[] encryptData=des.encrypt(srcData);
System.out.println("密文：");
if(encryptData!=null){
for(int i=0;i<encryptData.length;i++){
String hex=Integer.toHexString(encryptData[i]);
if(hex.length()>1)
System.out.print(hex.substring(hex.length()-2)+" ");
else
System.out.print("0"+hex+" ");
}
}
System.out.println("");
System.out.println("明文："+req);
}

// 转化字符串为十六进制编码
public static String toHexString(String s) {
String str = "";
for (int i = 0; i < s.length(); i++) {
int ch = (int) s.charAt(i);
String s4 = Integer.toHexString(ch);
str = str + s4;
}
return str;
}
}