欢迎您访问程序员文章站本站旨在为大家提供分享程序员计算机编程知识!
您现在的位置是: 首页

java实现RSA加解密工具类

程序员文章站 2024-03-14 14:33:16
...

RSAUtil

package com.zhuyun.rsa;
 
import java.io.IOException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
 
import javax.crypto.Cipher;
 
import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;
 
public class RSAUtil {
	//生成秘钥对
	public static KeyPair getKeyPair() throws Exception {
		KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
		keyPairGenerator.initialize(2048);
		KeyPair keyPair = keyPairGenerator.generateKeyPair();
		return keyPair;
	}
	
	//获取公钥(Base64编码)
	public static String getPublicKey(KeyPair keyPair){
		PublicKey publicKey = keyPair.getPublic();
		byte[] bytes = publicKey.getEncoded();
		return byte2Base64(bytes);
	}
	
	//获取私钥(Base64编码)
	public static String getPrivateKey(KeyPair keyPair){
		PrivateKey privateKey = keyPair.getPrivate();
		byte[] bytes = privateKey.getEncoded();
		return byte2Base64(bytes);
	}
	
	//将Base64编码后的公钥转换成PublicKey对象
	public static PublicKey string2PublicKey(String pubStr) throws Exception{
		byte[] keyBytes = base642Byte(pubStr);
		X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance("RSA");
		PublicKey publicKey = keyFactory.generatePublic(keySpec);
		return publicKey;
	}
	
	//将Base64编码后的私钥转换成PrivateKey对象
	public static PrivateKey string2PrivateKey(String priStr) throws Exception{
		byte[] keyBytes = base642Byte(priStr);
		PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
		KeyFactory keyFactory = KeyFactory.getInstance("RSA");
		PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
		return privateKey;
	}
	
	//公钥加密
	public static byte[] publicEncrypt(byte[] content, PublicKey publicKey) throws Exception{
		Cipher cipher = Cipher.getInstance("RSA");
		cipher.init(Cipher.ENCRYPT_MODE, publicKey);
		byte[] bytes = cipher.doFinal(content);
		return bytes;
	}
	
	//私钥解密
	public static byte[] privateDecrypt(byte[] content, PrivateKey privateKey) throws Exception{
		Cipher cipher = Cipher.getInstance("RSA");
		cipher.init(Cipher.DECRYPT_MODE, privateKey);
		byte[] bytes = cipher.doFinal(content);
		return bytes;
	}
	
	//字节数组转Base64编码
	public static String byte2Base64(byte[] bytes){
		BASE64Encoder encoder = new BASE64Encoder();
		return encoder.encode(bytes);
	}
	
	//Base64编码转字节数组
	public static byte[] base642Byte(String base64Key) throws IOException{
		BASE64Decoder decoder = new BASE64Decoder();
		return decoder.decodeBuffer(base64Key);
	}
}

TestRSA

package com.zhuyun.test;
 
import java.security.KeyPair;
import java.security.PrivateKey;
import java.security.PublicKey;
 
import org.junit.Test;
 
import com.zhuyun.rsa.RSAUtil;
 
public class TestRSA {
 
	@Test
	public void testRSA(){
		try {
			//===============生成公钥和私钥,公钥传给客户端,私钥服务端保留==================
			//生成RSA公钥和私钥,并Base64编码
			KeyPair keyPair = RSAUtil.getKeyPair();
			String publicKeyStr = RSAUtil.getPublicKey(keyPair);
			String privateKeyStr = RSAUtil.getPrivateKey(keyPair);
			System.out.println("RSA公钥Base64编码:" + publicKeyStr);
			System.out.println("RSA私钥Base64编码:" + privateKeyStr);
			
			//=================客户端=================
			//hello, i am infi, good night!加密
			String message = "hello, i am infi, good night!";
			//将Base64编码后的公钥转换成PublicKey对象
			PublicKey publicKey = RSAUtil.string2PublicKey(publicKeyStr);
			//用公钥加密
			byte[] publicEncrypt = RSAUtil.publicEncrypt(message.getBytes(), publicKey);
			//加密后的内容Base64编码
			String byte2Base64 = RSAUtil.byte2Base64(publicEncrypt);
			System.out.println("公钥加密并Base64编码的结果:" + byte2Base64);
			
			
			//##############	网络上传输的内容有Base64编码后的公钥 和 Base64编码后的公钥加密的内容     #################
			
			
			
			//===================服务端================
			//将Base64编码后的私钥转换成PrivateKey对象
			PrivateKey privateKey = RSAUtil.string2PrivateKey(privateKeyStr);
			//加密后的内容Base64解码
			byte[] base642Byte = RSAUtil.base642Byte(byte2Base64);
			//用私钥解密
			byte[] privateDecrypt = RSAUtil.privateDecrypt(base642Byte, privateKey);
			//解密后的明文
			System.out.println("解密后的明文: " + new String(privateDecrypt));
		} catch (Exception e) {
			e.printStackTrace();
		}
	}
 
}

测试结果如下:

RSA公钥Base64编码:MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA20p3Q88SmVUPpA+r/0hWY/LbMCsllwXK
UrXY13pG26BKsgtMm6IAGr6psS8cQ+AU75RpH3lTtt81wIfCHm9+vo4kVt66y8G0kfYSJ9Qlw2oH
5lwab8knPPb+NQNwE7WvceRczKh4XIEfNcgXZyKrcDUIpIsP6rNbZ70JYRhYiagqyLsb39ib4eO6
Zf6nmnrl3NPGeW4qFoivNudAld5E04gt2vCEEpuVt3x1/W3lVzD2gzz9rfkzjFvWwfGYjHMcZZNH
Z1h1G60ssSHh7WKV8f6EglPRQssimUKXX4De6g5SVABPs6MEOj0RYYyunJ8unA448u7/TCcMjV/b
vnndDwIDAQAB
RSA私钥Base64编码:MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDbSndDzxKZVQ+kD6v/SFZj8tsw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公钥加密并Base64编码的结果:rbHqJI9jlPLj/n4VP7d4jJRG1WDsDoWYib4BGjXEep6ym9FLiuCKCEwTDPuvvRzlH2BVFjkA0nN+
cjDo/u4PPofxK0a8Ipz0xYvnnQc9q+k8r0QD1uTx8PmnZLEv4rjwfIra/ho8VpYkPA7F1KkwDTyI
RIL06hngkhCi1aDym5oIP4vv+kxvi1uArVU04afXo6K4MTtzAesbG8f/qLHV7ywcBVNvb0QnuLNX
7jAWtfHfEGQibuA1EKbh35RcTjKlSW6vHTmg/f3fdHAfwKM/eh9LdMUjpsmfUoFfm8Ep7avjXbn+
12aXhtVZy8EYLIf1ZckefM95F808XN4HIsth6A==
解密后的明文: hello, i am infi, good night!

转自:https://blog.csdn.net/qq_32523587/article/details/79092364

上一篇: 爬取豆瓣的最新推荐图书

下一篇: