RSA加密算法java简单实现方法(必看)

RSA加密算法java简单实现方法(必看)

简单完整的代码，通过这个代码你将对RSA加密算法在java中的实现方法有一个初步的了解，这个类，你可以直接使用，水平高的，就自己修改完善下代码。

package security;

import java.security.*;

import java.security.spec.*;

import java.security.interfaces.*;

import javax.crypto.spec.*;

import javax.crypto.interfaces.*;

import java.io.*;

import java.math.*;

public class RSADemo {

public RSADemo() {

}

public static void generateKey() {

try {

KeyPairGenerator kpg = KeyPairGenerator.getInstance("RSA");

kpg.initialize(1024);

KeyPair kp = kpg.genKeyPair();

PublicKey pbkey = kp.getPublic();

PrivateKey prkey = kp.getPrivate();

// 保存公钥

FileOutputStream f1 = new FileOutputStream("pubkey.dat");

ObjectOutputStream b1 = new ObjectOutputStream(f1);

b1.writeObject(pbkey);

// 保存私钥

FileOutputStream f2 = new FileOutputStream("privatekey.dat");

ObjectOutputStream b2 = new ObjectOutputStream(f2);

b2.writeObject(prkey);

} catch (Exception e) {

}

}

public static void encrypt() throws Exception {

String s = "Hello World!";

// 获取公钥及参数e,n

FileInputStream f = new FileInputStream("pubkey.dat");

ObjectInputStream b = new ObjectInputStream(f);

RSAPublicKey pbk = (RSAPublicKey) b.readObject();

BigInteger e = pbk.getPublicExponent();

BigInteger n = pbk.getModulus(PLwwfNdF);

System.out.println("e= " + e);

System.out.println("n= " + n);

// 获取明文m

byte ptext[] = s.getBytes("UTF-8");

BigInteger m = new BigInteger(ptext);

// 计算密文c

BigInteger c = m.modPow(e, n);

System.out.println("c= " + c);

// 保存密文

String cs = c.toString();

BufferedWriter out =

new BufferedWriter(

new OutputStreamWriter(new FileOutputStream("encrypt.dat")));

out.write(cs, 0, cs.length());

out.close();

}

public static void decrypt() throws Exception {

// 读取密文

BufferedReader in =

new BufferedReader(

new InputStreamReader(new FileInputStream("encrypt.dat")));

String ctext = in.readLine();

BigInteger c = new BigInteger(ctext);

// 读取私钥

FileInputStream f = new FileInputStream("privatekey.dat");

ObjectInputStream b = new ObjectInputStream(f);

RSAPrivateKey prk = (RSAPrivateKey) b.readObject();

BigInteger d = prk.getPrivateExponent();

// 获取私钥参数及解密

BigInteger n = prk.getModulus();

System.out.println("d= " + d);

System.out.println("n= " + n);

BigInteger m = c.modPow(d, n);

// 显示解密结果

System.out.println("m= " + m);

byte[] mt = m.toByteArray();

System.out.println("PlainText is ");

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

System.out.print((char) mt[i]);

}

}

public static void main(String args[]) {

try {

generateKey();

encrypt();

decrypt();

} catch (Exception e) {

System.out.println(e.toString());

}

}

}

以上这篇RSA加密算法java简单实现方法

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