RSA签名算法

最新推荐文章于 2025-06-30 15:00:07 发布

转载最新推荐文章于 2025-06-30 15:00:07 发布 · 494 阅读

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原文链接：https://my.oschina.net/u/3229047/blog/968043

文章标签：

#java #数据结构与算法 #开发工具

本文提供了一个使用Java实现的RSA签名算法示例，包括私钥签名及公钥验证过程。通过生成RSA密钥对，利用私钥进行消息签名，并用公钥完成签名验证。

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RSA签名算法

私钥签名

公钥验证签名

package com.zml.rsa;

import org.apache.commons.codec.binary.Hex;

import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: zhaomingli
 * Date: 2017-06-16
 * Time: 9:08
 */
public class RsaTest {

    private static final String src ="sfsf";

    public static void main(String[] args) {
        jdkRSA();
    }

    public static void jdkRSA() {
        try {
            //初始化秘钥
            KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
            keyPairGenerator.initialize(512);
            KeyPair keyPair = keyPairGenerator.generateKeyPair();
            RSAPublicKey rsaPublicKey = (RSAPublicKey) keyPair.getPublic();//验证
            RSAPrivateKey rsaPrivateKey=(RSAPrivateKey)keyPair.getPrivate();//签名
            System.out.println("rsaPrivateKey***"+rsaPrivateKey);
            System.out.println("rsaPublicKey***"+rsaPublicKey);
            //执行签名
            PKCS8EncodedKeySpec pkcs8EncodedKeySpec=new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());
            KeyFactory keyFactory=KeyFactory.getInstance("RSA");
            PrivateKey privateKey=keyFactory.generatePrivate(pkcs8EncodedKeySpec);
            Signature signature =Signature.getInstance("MD5withRSA");
            signature.initSign(privateKey);
            signature.update(src.getBytes());
            byte[] result=signature.sign();
            System.out.println(Hex.encodeHexString(result));

            //签名验证
            X509EncodedKeySpec x509EncodedKeySpec=new X509EncodedKeySpec(rsaPublicKey.getEncoded());
            keyFactory=KeyFactory.getInstance("RSA");
            PublicKey publicKey=keyFactory.generatePublic(x509EncodedKeySpec);
            signature=Signature.getInstance("MD5withRSA");
            signature.initVerify(publicKey);
            signature.update(src.getBytes());
            boolean verify = signature.verify(result);
            System.out.println("JDK"+verify);
        } catch (Exception e) {
    }}

}

转载于:https://my.oschina.net/u/3229047/blog/968043