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java 加密算法 DES 實現代碼

package com.yill;

import java.security.SecureRandom;

import javax.crypto.Cipher;

import javax.crypto.SecretKey;

import javax.crypto.SecretKeyFactory;

import javax.crypto.spec.DESKeySpec;

public class YillDES

{

private static final byte[] key = "HelloWorld".getBytes();

public static void main(String[] args)

{

String myInfo = "http://www.aygfsteel.com/yill/";

System.out.println("MyInfo is " + myInfo);

byte[] encrypted = encrypt(myInfo.getBytes());

System.out.println("Encrypted myInfo is " + new String(encrypted));

System.out.println("Decrypted myInfo is "

+ new String(decrypt(encrypted)));

}

public static byte[] encrypt(byte[] origin)

{

byte[] encrypted = null;

try

{

// 生成密鑰

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

SecretKey secretKey = factory.generateSecret(new DESKeySpec(key));

// 初始化加密工具cipher

Cipher cipher = Cipher.getInstance("DES");

cipher.init(Cipher.ENCRYPT_MODE, secretKey, new SecureRandom());

encrypted = cipher.doFinal(origin);

}

catch (Exception e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

return encrypted;

}

public static byte[] decrypt(byte[] encrypted)

{

byte[] decrypted = null;

try

{

// 生成密鑰

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

SecretKey secretKey = factory.generateSecret(new DESKeySpec(key));

// 初始化加密工具cipher

Cipher cipher = Cipher.getInstance("DES");

cipher.init(Cipher.DECRYPT_MODE, secretKey, new SecureRandom());

decrypted = cipher.doFinal(encrypted);

}

catch (Exception e)

{

// TODO Auto-generated catch block

e.printStackTrace();

}

return decrypted;

}

運行結果：

MyInfo is http://www.aygfsteel.com/yill/
Encrypted myInfo is X耾%
孑塖籫ㄎn勯錍雴?:啌狒>堷z
Decrypted myInfo is http://www.aygfsteel.com/yill/

posted on 2008-03-16 13:58 yill 閱讀(471) 評論(0) 編輯收藏

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