package com.hx.util.rsa;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import sun.misc.BASE64Decoder;
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import sun.misc.BASE64Encoder;
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import javax.crypto.Cipher;
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import java.io.IOException;
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import java.security.*;
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import java.security.spec.PKCS8EncodedKeySpec;
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import java.security.spec.X509EncodedKeySpec;
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public class RSAUtil {
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//log4j日志
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private static Logger logger = LoggerFactory.getLogger(RSAUtil.class.getName());
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/**生成秘钥对*/
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public static KeyPair getKeyPair() throws Exception {
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KeyPairGenerator keyPairGenerator = KeyPairGenerator.getInstance("RSA");
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keyPairGenerator.initialize(2048);
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KeyPair keyPair = keyPairGenerator.generateKeyPair();
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return keyPair;
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}
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/**获取公钥(Base64编码)*/
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public static String getPublicKey(KeyPair keyPair) {
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PublicKey publicKey = keyPair.getPublic();
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byte[] bytes = publicKey.getEncoded();
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return byte2Base64(bytes);
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}
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/**获取私钥(Base64编码)*/
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public static String getPrivateKey(KeyPair keyPair) {
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PrivateKey privateKey = keyPair.getPrivate();
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byte[] bytes = privateKey.getEncoded();
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return byte2Base64(bytes);
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}
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/**将Base64编码后的公钥转换成PublicKey对象*/
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public static PublicKey string2PublicKey(String pubStr) throws Exception {
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byte[] keyBytes = base642Byte(pubStr);
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X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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PublicKey publicKey = keyFactory.generatePublic(keySpec);
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return publicKey;
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}
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/**将Base64编码后的私钥转换成PrivateKey对象*/
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public static PrivateKey string2PrivateKey(String priStr) throws Exception {
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byte[] keyBytes = base642Byte(priStr);
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PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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PrivateKey privateKey = keyFactory.generatePrivate(keySpec);
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return privateKey;
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}
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/**公钥加密*/
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public static String publicEncrypt(String content, String publicKey) {
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try {
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Cipher cipher = Cipher.getInstance("RSA");
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cipher.init(Cipher.ENCRYPT_MODE, string2PublicKey(publicKey));
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byte[] bytes = cipher.doFinal(content.getBytes());
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return byte2Base64(bytes);
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} catch (Exception e) {
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//logger.error("公钥加密失败{}", e);
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}
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return null;
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}
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/**私钥解密*/
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public static String privateDecrypt(String content, String privateKey) {
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try {
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Cipher cipher = Cipher.getInstance("RSA");
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cipher.init(Cipher.DECRYPT_MODE, string2PrivateKey(privateKey));
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byte[] bytes = cipher.doFinal(base642Byte(content));
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return new String(bytes);
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} catch (Exception e) {
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//logger.error("私钥解密失败{}", e);
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}
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return null;
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}
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//字节数组转Base64编码
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public static String byte2Base64(byte[] bytes) {
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BASE64Encoder encoder = new BASE64Encoder();
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return encoder.encode(bytes);
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}
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//Base64编码转字节数组
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public static byte[] base642Byte(String base64Key) throws IOException {
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BASE64Decoder decoder = new BASE64Decoder();
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return decoder.decodeBuffer(base64Key);
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}
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public static void main(String[] args) {
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try {
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KeyPair keyPair = getKeyPair();
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String publicKeyStr = getPublicKey(keyPair);
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String privateKeyStr = getPrivateKey(keyPair);
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System.out.println("publicKey:"+publicKeyStr);
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System.out.println("privateKey:"+privateKeyStr);
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//String publicKeyStr = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCWY1VKIXGStXOMtSkb2nqV9A4V6MqlTPv8Dg9Sdxm8TZgOYJJxFAjpUOwt0au6q5JDTrslZngg9um1IhNJlRLEySbTvN7Bzeq6XOpZx5w6XRZ+7/o0Ui4YvcYwIHB5DgS5XJnLa3vLqWOk4NAtY0lqC20170mHi5Fmjdak63OTzwIDAQAB";
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//=================客户端=================
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String message = "jia_he";
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//用公钥加密
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String byte2Base64 = RSAUtil.publicEncrypt(message, publicKeyStr);
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System.out.println("公钥加密并Base64编码的结果：" + byte2Base64);
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//===================服务端================
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//String privateKeyStr = "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";
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//解密后的明文
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System.out.println("解密后的明文: " +RSAUtil.privateDecrypt(byte2Base64, privateKeyStr));
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} catch (Exception e) {
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e.printStackTrace();
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}
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}
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}
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