package com.lf.server.helper;
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import org.apache.commons.codec.binary.Base64;
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import org.apache.commons.logging.Log;
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import org.apache.commons.logging.LogFactory;
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import org.springframework.core.io.ClassPathResource;
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import javax.crypto.Cipher;
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import java.io.*;
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import java.nio.charset.StandardCharsets;
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import java.security.*;
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import java.security.interfaces.RSAPrivateKey;
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import java.security.interfaces.RSAPublicKey;
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import java.security.spec.PKCS8EncodedKeySpec;
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import java.security.spec.X509EncodedKeySpec;
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import java.util.HashMap;
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import java.util.Map;
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/**
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* RSA工具类
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* @author WWW
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*/
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public class RsaHelper {
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/**
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* 私钥
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*/
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private static String privateKey;
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/**
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* 公钥
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*/
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private static String publicKey;
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/**
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* 密钥算法
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*/
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private static final String KEY_ALGORITHM = "RSA";
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/**
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* RSA密钥长度：1024 或 2048
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*/
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private static final int DEFAULT_RSA_KEY_SIZE = 1024;
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/**
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* 日志
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*/
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private final static Log log = LogFactory.getLog(RsaHelper.class);
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/**
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* 生成公私钥
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*/
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public static void generate() {
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Map<String, String> result = generateRsaKey(DEFAULT_RSA_KEY_SIZE);
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System.out.println("公钥为：" + result.get("publicKey"));
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System.out.println("私钥为：" + result.get("privateKey"));
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}
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/**
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* 获取RSA加密私钥
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*
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* @return
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* @throws IOException
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*/
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public static String getPrivateKey() throws IOException {
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if (privateKey == null) {
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InputStream inPrivate = new ClassPathResource("config" + File.separator + "rsa_private_key.txt").getInputStream();
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privateKey = inputStream2String(inPrivate);
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inPrivate.close();
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}
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return privateKey;
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}
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/**
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* 获取RSA加密公钥
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*
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* @return
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* @throws IOException
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*/
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public static String getPublicKey() throws IOException {
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if (publicKey == null) {
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InputStream inPrivate = new ClassPathResource("config" + File.separator + "rsa_public_key.txt").getInputStream();
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publicKey = inputStream2String(inPrivate);
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inPrivate.close();
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}
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return publicKey;
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}
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/**
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* 读取文本文件
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*
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* @param fileName 文件路径
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* @return
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* @throws IOException
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*/
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public static String readFile(String fileName) throws IOException {
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File file = new File(fileName);
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BufferedReader br = new BufferedReader(new FileReader(file));
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StringBuilder result = new StringBuilder();
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String line = null;
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while ((line = br.readLine()) != null) {
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result.append(System.lineSeparator() + line);
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}
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br.close();
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return result.toString();
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}
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/**
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* 把inputStream转成String
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*
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* @param is
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* @return
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* @throws IOException
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*/
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private static String inputStream2String(InputStream is) throws IOException {
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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int i = -1;
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while ((i = is.read()) != -1) {
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baos.write(i);
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}
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String str = baos.toString();
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baos.close();
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return str;
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}
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/**
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* 生成RSA的公私钥
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*
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* @param keySize 1025 或 2048
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* @return
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*/
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public static Map<String, String> generateRsaKey(int keySize) {
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Map<String, String> result = new HashMap<>(2);
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try {
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KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
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// 初始化密钥对生成器，密钥大小为1024 2048位
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keyPairGen.initialize(keySize, new SecureRandom());
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// 生成一个密钥对，保存在keyPair中
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KeyPair keyPair = keyPairGen.generateKeyPair();
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// 得到公钥字符串
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String pub = new String(Base64.encodeBase64(keyPair.getPublic().getEncoded()));
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result.put("publicKey", pub);
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// 得到私钥字符串
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String pri = new String(Base64.encodeBase64(keyPair.getPrivate().getEncoded()));
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result.put("privateKey", pri);
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} catch (Exception ex) {
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log.error(ex.getMessage(), ex);
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}
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return result;
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}
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/**
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* RSA私钥解密
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*
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* @param str 加密的字符串
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* @return 解密字符串
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* @throws Exception 加密过程中的异常信息
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*/
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public static String decrypt(String str) throws Exception {
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// 64位解码加密后的字符串
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byte[] inputByte = Base64.decodeBase64(str.getBytes(StandardCharsets.UTF_8));
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// Base64编码的私钥
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byte[] decoded = Base64.decodeBase64(getPrivateKey());
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RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA").generatePrivate(new PKCS8EncodedKeySpec(decoded));
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// RSA解密：RSA/ECB/NoPadding
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Cipher cipher = Cipher.getInstance("RSA");
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cipher.init(Cipher.DECRYPT_MODE, priKey);
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String outStr = new String(cipher.doFinal(inputByte));
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return outStr;
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}
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/**
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* RSA公钥加密
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*
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* @param str 需要加密的字符串
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* @return 密文
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* @throws Exception 加密过程中的异常信息
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*/
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public static String encrypt(String str) throws Exception {
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// Base64编码的公钥
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byte[] decoded = Base64.decodeBase64(getPublicKey());
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RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA").generatePublic(new X509EncodedKeySpec(decoded));
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// RSA加密：RSA/ECB/NoPadding
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Cipher cipher = Cipher.getInstance("RSA");
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cipher.init(Cipher.ENCRYPT_MODE, pubKey);
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String outStr = Base64.encodeBase64String(cipher.doFinal(str.getBytes(StandardCharsets.UTF_8)));
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return outStr;
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}
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}
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