java的DES加密解密輔助類

package temptest;

import java.io.IOException;

import java.io.UnsupportedEncodingException;

import javax.crypto.*;

import javax.crypto.spec.*;

import sun.misc.BASE64Decoder;

public class desencryptiontest {

public static void main(String[] args) {

String text = "測試asdY^&*NN!__s some plaintext!";

System.out.println("加密前的明文:" + text);

String cryperText = "";

try {

cryperText = toHexString(encrypt(text));

System.out.println("加密前的明文:" + cryperText);

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

try {

System.out.println("解密后的明文:" + decrypt(cryperText));

} catch (Exception e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

try {

System.in.read();

} catch (IOException e) {

// TODO Auto-generated catch block

e.printStackTrace();

}

}

private static byte[] desKey;

private static String key = "19491001";

public static String decrypt(String message) throws Exception {

byte[] bytesrc = convertHexString(message);

Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

SecretKey secretKey = keyFactory.generateSecret(desKeySpec);

IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));

cipher.init(Cipher.DECRYPT_MODE, secretKey, iv);

byte[] retByte = cipher.doFinal(bytesrc);

return new String(retByte);

}

public static byte[] encrypt(String message) throws Exception {

Cipher cipher = Cipher.getInstance("DES/CBC/PKCS5Padding");

DESKeySpec desKeySpec = new DESKeySpec(key.getBytes("UTF-8"));

SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");

SecretKey secretKey = keyFactory.generateSecret(desKeySpec);

IvParameterSpec iv = new IvParameterSpec(key.getBytes("UTF-8"));

cipher.init(Cipher.ENCRYPT_MODE, secretKey, iv);

return cipher.doFinal(message.getBytes("UTF-8"));

}

public static byte[] convertHexString(String ss) {

byte digest[] = new byte[ss.length() / 2];

for (int i = 0; i < digest.length; i++) {

String byteString = ss.substring(2 * i, 2 * i + 2);

int byteValue = Integer.parseInt(byteString, 16);

digest[i] = (byte) byteValue;

}

return digest;

}

public static String toHexString(byte b[]) {

StringBuffer hexString = new StringBuffer();

for (int i = 0; i < b.length; i++) {

String plainText = Integer.toHexString(0xff & b[i]);

if (plainText.length() < 2)

plainText = "0" + plainText;

hexString.append(plainText);

}

return hexString.toString();

}

}

發布者：系統管理員 ? 點擊數：1544 ? 發布時間：2017-09-01 17:49:24 ? 更新時間：2018-05-18 17:54:24

總結

以上是生活随笔為你收集整理的java des加密类_java的DES加密解密辅助类的全部內容，希望文章能夠幫你解決所遇到的問題。

如果覺得生活随笔網站內容還不錯，歡迎將生活随笔推薦給好友。