利用3DES實現加密解密的Java代碼
采用ECB，補位模式為：PKCS5
import javax.crypto.Cipher; import javax.crypto.SecretKey; import javax.crypto.spec.SecretKeySpec;/**
- 項目名稱：**
- 類名稱：ThreeDES
- 類描述： 3des 加密工具類
@version 1.0
/ public class ThreeDES {//key 根據實際情況對應的修改 private final byte[] keybyte="123456788765432112345678".getBytes(); //keybyte為加密密鑰，長度為24字節 private static final String Algorithm = "DESede"; //定義 加密算法,可用 DES,DESede,Blowfish private SecretKey deskey; ///生成密鑰 public ThreeDES(){
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) { //加密失敗，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) { //解密失敗，打日志 ex.printStackTrace(); } return null;}
public static void main(String[] args) throws Exception { ThreeDES des=new ThreeDES(); String req ="135|一二|10100001|410883198501285014|||||1|2|"; // String req1 ="<?xml version=\"1.0\" encoding=\"UTF-8\"?><service><head><field name=\"spdtrancode\">11111</field><field name=\"spdtranserno\">CM0172061308908f4dc995222321f6ecb888</field><field name=\"spdressys\">2001</field><field name=\"spdresdate\">20141223</field><field name=\"spdrestime\">153606</field><field name=\"spdtranstate\">S</field><field name=\"spderrocode\"></field><field name=\"spderrormsg\"></field></head><body><field name=\"spdcheckrslt\">000000</field></body></service>";
String toreq =toHexString(req);
System.err.println("十六進制報文===="+toreq);
byte [] srcData=req.toString().getBytes("GBK");
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：");
}
// 轉化字符串為十六進制編碼
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;
}
}</pre>