Java實現RSA算法的方法詳解

本文實例講述了Java實現RSA算法的方法。分享給大家供大家參考，具體如下：

一介紹

唯一廣泛接受並實現用於數據加密和數字簽名公鑰加密、私鑰解密私鑰加密、公鑰解密

二RSA參數說明

三實現

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.初始化密鑰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.私鑰加密、公鑰解密――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("私鑰加密、公鑰解密――加密: " + Base64.encodeBase64String(result)); //3.私鑰加密、公鑰解密――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("私鑰加密、公鑰解密――解密：" + new String(result)); //4.公鑰加密、私鑰解密――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("公鑰加密、私鑰解密――加密: " + Base64.encodeBase64String(result)); //5.公鑰加密、私鑰解密――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("公鑰加密、私鑰解密――解密：" + new String(result)); } catch (Exception e) { e.printStackTrace(); } }}

四實現效果

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

五應用場景

PS：關於加密解密感興趣的朋友還可以參考本站在線工具：

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

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

MD5在線加密工具:
http://tools.VeVB.COm/password/CreateMD5Password

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

在線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

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

更多關於java相關內容感興趣的讀者可查看本站專題：《Java數學運算技巧總結》、《Java數據結構與算法教程》、《Java字符與字符串操作技巧總結》、《Java操作DOM節點技巧總結》和《Java緩存操作技巧匯總》

希望本文所述對大家java程序設計有所幫助。