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RSA加密算法java简单实现方法(必看)

时间:2020-06-16 10:55     来源/作者:haole19

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。

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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();
        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());
        }
    }
}

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