package com.panzhihua.service_community.util;
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import java.security.KeyFactory;
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import java.security.KeyPair;
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import java.security.KeyPairGenerator;
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import java.security.NoSuchAlgorithmException;
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import java.security.PublicKey;
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import java.security.SecureRandom;
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import java.security.Signature;
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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.ECGenParameterSpec;
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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.Arrays;
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import java.util.HashMap;
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import java.util.Map;
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import javax.crypto.Cipher;
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import org.apache.commons.codec.binary.Base64;
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import org.bouncycastle.jce.provider.BouncyCastleProvider;
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import com.alibaba.fastjson.JSONObject;
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import org.jsoup.internal.StringUtil;
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public class RSAUtils {
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private static Map<Integer, String> keyMap = new HashMap<Integer, String>(); // 用于封装随机产生的公钥与私钥
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/**
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* 随机生成密钥对
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*
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* @throws NoSuchAlgorithmException
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*/
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public static void genKeyPair() throws NoSuchAlgorithmException {
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// KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象
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KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance("RSA");
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// 初始化密钥对生成器，密钥大小为96-1024位
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keyPairGen.initialize(1024, 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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RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate(); // 得到私钥
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RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic(); // 得到公钥
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String publicKeyString = new String(Base64.encodeBase64(publicKey.getEncoded()));
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// 得到私钥字符串
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String privateKeyString = new String(Base64.encodeBase64((privateKey.getEncoded())));
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// 将公钥和私钥保存到Map
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System.out.println("publicKeyString:" + publicKeyString);
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System.out.println("privateKeyString:" + privateKeyString);
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keyMap.put(0, publicKeyString); // 0表示公钥
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keyMap.put(1, privateKeyString); // 1表示私钥
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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 加密字符串
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* @param publicKey 公钥
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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, String publicKey) throws Exception {
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if (StringUtil.isBlank(str)) {
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return "";
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}
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// base64编码的公钥
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byte[] decoded = Base64.decodeBase64(publicKey);
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RSAPublicKey pubKey = (RSAPublicKey) KeyFactory.getInstance("RSA")
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.generatePublic(new X509EncodedKeySpec(decoded));
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// RSA加密
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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("UTF-8")));
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return outStr;
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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 加密字符串
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* @param privateKey 私钥
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* @return 铭文
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* @throws Exception 解密过程中的异常信息
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*/
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public static String decrypt(String str, String privateKey) 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("UTF-8"));
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// base64编码的私钥
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byte[] decoded = Base64.decodeBase64(privateKey);
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RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA")
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.generatePrivate(new PKCS8EncodedKeySpec(decoded));
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// RSA解密
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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私钥解密
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*
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* @param str 加密字符串
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* @param privateKey 私钥
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* @return 铭文
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* @throws Exception 解密过程中的异常信息
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*/
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public static String decrypt2(String str, String privateKey) throws Exception {
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str = str.replace(" ", "+");
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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("UTF-8"));
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// base64编码的私钥
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byte[] decoded = Base64.decodeBase64(privateKey);
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RSAPrivateKey priKey = (RSAPrivateKey) KeyFactory.getInstance("RSA")
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.generatePrivate(new PKCS8EncodedKeySpec(decoded));
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// RSA解密
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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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public static String rsaEncrypt(String input, String rsaPublicKey) {
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String result = "";
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try {
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// 将Base64编码后的公钥转换成PublicKey对象
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byte[] buffer = Base64.decodeBase64(rsaPublicKey);
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KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
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PublicKey publicKey = keyFactory.generatePublic(keySpec);
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// 加密
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Cipher cipher = Cipher.getInstance("RSA");
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cipher.init(Cipher.ENCRYPT_MODE, publicKey);// ubli
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byte[] inputArray = input.getBytes();
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int inputLength = inputArray.length;
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// System.out.println("加密字节数：" + inputLength);
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// 最大加密字节数，超出最大字节数需要分组加密
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int MAX_ENCRYPT_BLOCK = 117;
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// 标识
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int offSet = 0;
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byte[] resultBytes = {};
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byte[] cache = {};
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while (inputLength - offSet > 0) {
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if (inputLength - offSet > MAX_ENCRYPT_BLOCK) {
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cache = cipher.doFinal(inputArray, offSet, MAX_ENCRYPT_BLOCK);
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offSet += MAX_ENCRYPT_BLOCK;
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} else {
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cache = cipher.doFinal(inputArray, offSet, inputLength - offSet);
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offSet = inputLength;
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}
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resultBytes = Arrays.copyOf(resultBytes, resultBytes.length + cache.length);
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System.arraycopy(cache, 0, resultBytes, resultBytes.length - cache.length, cache.length);
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}
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result = Base64.encodeBase64String(resultBytes);
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} catch (Exception e) {
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System.out.println("rsaEncrypt error:" + e.getMessage());
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}
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// System.out.println("加密的结果：" + result);
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return result;
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}
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}
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