Java实现RSA算法的方法详解

本文实例讲述了Java实现RSA算法的方法。分享给大家供大家参考，具体如下：

一 介绍

唯一广泛接受并实现
用于数据加密和数字签名
公钥加密、私钥解密
私钥加密、公钥解密

二 RSA参数说明

三 实现

package com.imooc.security.rsa;import java.security.KeyFactory;import java.security.KeyPair;import java.security.KeyPairGenerator;import java.security.PrivateKey;import java.security.PublicKey;import java.security.interfaces.RSAPrivateKey;import java.security.interfaces.RSAPublicKey;import java.security.spec.PKCS8EncodedKeySpec;import java.security.spec.X509EncodedKeySpec;import javax.crypto.Cipher;import org.apache.commons.codec.binary.Base64;public class ImoocRSA {  private static String src = "cakin24 security rsa";  public static void main(String[] args) {    jdkRSA();  }  public static void jdkRSA() {    try {      //1.初始化密钥      KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");      keyPairGenerator.initialize(512);      KeyPair keyPair = keyPairGenerator.generateKeyPair();      RSAPublicKey rsaPublicKey = (RSAPublicKey)keyPair.getPublic();      RSAPrivateKey rsaPrivateKey = (RSAPrivateKey)keyPair.getPrivate();      System.out.println("Public Key : " + Base64.encodeBase64String(rsaPublicKey.getEncoded()));      System.out.println("Private Key : " + Base64.encodeBase64String(rsaPrivateKey.getEncoded()));      //2.私钥加密、公钥解密――加密      PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());      KeyFactory keyFactory = KeyFactory.getInstance("RSA");      PrivateKey privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);      Cipher cipher = Cipher.getInstance("RSA");      cipher.init(Cipher.ENCRYPT_MODE, privateKey);      byte[] result = cipher.doFinal(src.getBytes());      System.out.println("私钥加密、公钥解密――加密 : " + Base64.encodeBase64String(result));      //3.私钥加密、公钥解密――解密      X509EncodedKeySpec x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded());      keyFactory = KeyFactory.getInstance("RSA");      PublicKey publicKey = keyFactory.generatePublic(x509EncodedKeySpec);      cipher = Cipher.getInstance("RSA");      cipher.init(Cipher.DECRYPT_MODE, publicKey);      result = cipher.doFinal(result);      System.out.println("私钥加密、公钥解密――解密：" + new String(result));      //4.公钥加密、私钥解密――加密      x509EncodedKeySpec = new X509EncodedKeySpec(rsaPublicKey.getEncoded());      keyFactory = KeyFactory.getInstance("RSA");      publicKey = keyFactory.generatePublic(x509EncodedKeySpec);      cipher = Cipher.getInstance("RSA");      cipher.init(Cipher.ENCRYPT_MODE, publicKey);      result = cipher.doFinal(src.getBytes());      System.out.println("公钥加密、私钥解密――加密 : " + Base64.encodeBase64String(result));      //5.公钥加密、私钥解密――解密      pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(rsaPrivateKey.getEncoded());      keyFactory = KeyFactory.getInstance("RSA");      privateKey = keyFactory.generatePrivate(pkcs8EncodedKeySpec);      cipher = Cipher.getInstance("RSA");      cipher.init(Cipher.DECRYPT_MODE, privateKey);      result = cipher.doFinal(result);      System.out.println("公钥加密、私钥解密――解密：" + new String(result));    } catch (Exception e) {      e.printStackTrace();    }  }}

四 实现效果

Public Key : MFwwDQYJKoZIhvcNAQEBBQADSwAwSAJBAJcBeOb97IdkkirBmx3MOY5e4eRwh0uvC2BcNlY1rDo0lZ8ibR1bl1RJXWkHv7U0ASO/5DBlnnnGbQRtsJlsCPMCAwEAAQ==
Private Key : MIIBVAIBADANBgkqhkiG9w0BAQEFAASCAT4wggE6AgEAAkEAlwF45v3sh2SSKsGbHcw5jl7h5HCHS68LYFw2VjWsOjSVnyJtHVuXVEldaQe/tTQBI7/kMGWeecZtBG2wmWwI8wIDAQABAkAdSkPRSl+ew3s2n+cemIZxfyYB0XHs1D84qapAfpixkUNvWL0A4ovrwsnwt4MEjAtWVTufNvTxIZcZdx+Q5DbBAiEA9TzzYMGRU+3mdlAx0ICF+NIqwvlqyvedKa4KSx55gVUCIQCdoeX6mqGRP78aQjYKWeogwliszjU5fN/LFvKZrcgBJwIhAMvbBLzzaykHY0IKW75kd/lkSyOUTY+20bAp+miDRqGZAiA6r36eeRkzqUbtcL8LxYPb5F79HtxD5dCvnIB/ZGp0uwIgWtXI7IxHjYCsNomSJdu1J3dU9KqQuW/eOHxrk/OgUYE=
私钥加密、公钥解密――加密 : VjkFsOiVeLvKES5RprhsJK9tdTzohdELLS7yluidCYEe7DkuCM9srj8kwadynHI4M0oLAfJhK6447hp7Ia8x7A==
私钥加密、公钥解密――解密：cakin24 security rsa
公钥加密、私钥解密――加密 : gAWl73UxHtO+EfKkpmfMdhtK0Vh7HB8n+30l1Hp8aAMIagD21h2x/q/Ns+soGsOXNovuNzaSGZenmZzcjB4VEA==
公钥加密、私钥解密――解密：cakin24 security rsa

五 应用场景

PS：关于加密解密感兴趣的朋友还可以参考本站在线工具：

在线RSA加密/解密工具：
http://tools.VeVB.COm/password/rsa_encode

文字在线加密解密工具（包含AES、DES、RC4等）：
http://tools.VeVB.COm/password/txt_encode

MD5在线加密工具:
http://tools.VeVB.COm/password/CreateMD5Password

在线散列/哈希算法加密工具:
http://tools.VeVB.COm/password/hash_encrypt

在线MD5/hash/SHA-1/SHA-2/SHA-256/SHA-512/SHA-3/RIPEMD-160加密工具：
http://tools.VeVB.COm/password/hash_md5_sha

在线sha1/sha224/sha256/sha384/sha512加密工具：
http://tools.VeVB.COm/password/sha_encode

更多关于java相关内容感兴趣的读者可查看本站专题：《Java数学运算技巧总结》、《Java数据结构与算法教程》、《Java字符与字符串操作技巧总结》、《Java操作DOM节点技巧总结》和《Java缓存操作技巧汇总》

希望本文所述对大家java程序设计有所帮助。