?? pairkeyexample.java
字號(hào):
/*
* Copyright (c) 2004 ???. All Rights Reserved.
*
* Version 1.0 , Created on 2004-3-10
*
*/
/**
* @author Devon
*/
import java.security.*;
import java.security.spec.*;
import javax.crypto.*;
public class PairKeyExample {
public static void main(String argv[]) {
try {
String algorithm = "RSA"; //定義加密算法,可用 DES,DESede,Blowfish
String message = "張三,你好,我是李四";
//產(chǎn)生張三的密鑰對(duì)(keyPairZhang)
KeyPairGenerator keyGeneratorZhang =
KeyPairGenerator.getInstance(algorithm); //指定采用的算法
keyGeneratorZhang.initialize(1024); //指定密鑰長(zhǎng)度為1024位
KeyPair keyPairZhang = keyGeneratorZhang.generateKeyPair(); //產(chǎn)生密鑰對(duì)
System.out.println("生成張三的公鑰對(duì)");
// 張三生成公鑰(publicKeyZhang)并發(fā)送給李四,這里發(fā)送的是公鑰的數(shù)組字節(jié)
byte[] publicKeyZhangEncode = keyPairZhang.getPublic().getEncoded();
//通過網(wǎng)絡(luò)或磁盤等方式,把公鑰編碼傳送給李四
//李四接收到張三編碼后的公鑰,將其解碼
KeyFactory keyFacoryLi = KeyFactory.getInstance(algorithm); //得到KeyFactory對(duì)象
X509EncodedKeySpec x509KeySpec =
new X509EncodedKeySpec(publicKeyZhangEncode); //公鑰采用X.509編碼
PublicKey publicKeyZhang = keyFacoryLi.generatePublic(x509KeySpec); //將公鑰的KeySpec對(duì)象轉(zhuǎn)換為公鑰
System.out.println("李四成功解碼,得到張三的公鑰");
//李四用張三的公鑰加密信息,并發(fā)送給李四
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding"); //得到Cipher對(duì)象
cipher.init(Cipher.ENCRYPT_MODE, publicKeyZhang); //用張三的公鑰初始化Cipher對(duì)象
byte[] cipherMessage = cipher.doFinal(message.getBytes()); //得到加密信息
System.out.println("加密后信息:" + new String(cipherMessage));
System.out.println("加密完成,發(fā)送給李四...");
//張三用自己的私鑰解密從李四處收到的信息
cipher.init(Cipher.DECRYPT_MODE, keyPairZhang.getPrivate()); //張三用其私鑰初始化Cipher對(duì)象
byte[] originalMessage = cipher.doFinal(cipherMessage); //得到解密后信息
System.out.println("張三收到信息,解密后為:" + new String(originalMessage));
} catch (Exception ex) {
ex.printStackTrace();
}
}
}
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