package com.fzzy.gateway.util;
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import javax.crypto.Cipher;
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import java.io.ByteArrayOutputStream;
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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 org.apache.xerces.impl.dv.util.Base64;
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import java.util.HashMap;
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import java.util.Map;
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public class GatewayRSAUtils {
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/**
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* RSA最大加密明文大小 2048/8-11
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*/
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private static final int MAX_ENCRYPT_BLOCK = 245;
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/**
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* RSA最大解密密文大小 2048/8
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*/
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private static final int MAX_DECRYPT_BLOCK = 256;
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private static final int KEYSIZE = 1024;// 密钥位数
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/**
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* 定义加密方式
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*/
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public static final String KEY_RSA = "RSA";
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/**
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* 定义公钥关键词
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*/
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public static final String KEY_RSA_PUBLICKEY = "RSAPublicKey";
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/**
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* 定义私钥关键词
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*/
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public static final String KEY_RSA_PRIVATEKEY = "RSAPrivateKey";
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/**
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* 定义签名算法
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*/
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private final static String KEY_RSA_SIGNATURE = "MD5withRSA";
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/**
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* 生成公私密钥对
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*/
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public static Map<String, Object> init() {
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Map<String, Object> map = null;
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try {
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KeyPairGenerator generator = KeyPairGenerator.getInstance(KEY_RSA);
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//设置密钥对的bit数，越大越安全，但速度减慢，一般使用512或1024
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generator.initialize(KEYSIZE);
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KeyPair keyPair = generator.generateKeyPair();
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// 获取公钥
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RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
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// 获取私钥
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RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
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// 将密钥对封装为Map
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map = new HashMap<>(2);
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map.put(KEY_RSA_PUBLICKEY, publicKey);
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map.put(KEY_RSA_PRIVATEKEY, privateKey);
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} catch (NoSuchAlgorithmException e) {
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e.printStackTrace();
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}
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return map;
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}
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/**
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* 获取Base64编码的公钥字符串
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*/
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public static String getPublicKey(Map<String, Object> map) {
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String str = "";
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Key key = (Key) map.get(KEY_RSA_PUBLICKEY);
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str = encryptBase64(key.getEncoded());
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return str;
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}
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/**
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* 获取Base64编码的私钥字符串
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*/
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public static String getPrivateKey(Map<String, Object> map) {
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String str = "";
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Key key = (Key) map.get(KEY_RSA_PRIVATEKEY);
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str = encryptBase64(key.getEncoded());
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return str;
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}
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/**
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* BASE64 解码
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*
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* @param key 需要Base64解码的字符串
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* @return 字节数组
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*/
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public static byte[] decryptBase64(String key) {
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// return Base64.getDecoder().decode(key);
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return Base64.decode(key);
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}
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/**
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* BASE64 编码
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*
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* @param key 需要Base64编码的字节数组
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* @return 字符串
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*/
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public static String encryptBase64(byte[] key) {
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// return new String(Base64.getEncoder().encode(key));
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return new String(Base64.encode(key));
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}
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/**
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* 公钥加密 如果大于245则分段加密
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*/
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public static String encryptByPublic(String encryptingStr, String publicKeyStr) {
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try {
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// 将公钥由字符串转为UTF-8格式的字节数组
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byte[] publicKeyBytes = decryptBase64(publicKeyStr);
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// 获得公钥
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X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKeyBytes);
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// 取得待加密数据
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byte[] data = encryptingStr.getBytes(StandardCharsets.UTF_8);
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KeyFactory factory;
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factory = KeyFactory.getInstance(KEY_RSA);
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PublicKey publicKey = factory.generatePublic(keySpec);
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// 对数据加密
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Cipher cipher = Cipher.getInstance(factory.getAlgorithm());
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cipher.init(Cipher.ENCRYPT_MODE, publicKey);
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int inputLen = data.length;
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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int offSet = 0;
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byte[] cache;
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int i = 0;
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// 对数据分段加密
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while (inputLen - offSet > 0) {
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if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
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cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
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} else {
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cache = cipher.doFinal(data, offSet, inputLen - offSet);
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}
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out.write(cache, 0, cache.length);
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i++;
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offSet = i * MAX_ENCRYPT_BLOCK;
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}
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byte[] encryptedData = out.toByteArray();
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out.close();
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// 返回加密后由Base64编码的加密信息
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return encryptBase64(encryptedData);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 私钥解密 如果大于256则分段解密
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*/
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public static String decryptByPrivate(String encryptedStr, String privateKeyStr) {
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try {
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// 对私钥解密
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byte[] privateKeyBytes = decryptBase64(privateKeyStr);
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// 获得私钥
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PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKeyBytes);
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// 获得待解密数据
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byte[] data = decryptBase64(encryptedStr);
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KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
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PrivateKey privateKey = factory.generatePrivate(keySpec);
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// 对数据解密
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Cipher cipher = Cipher.getInstance(factory.getAlgorithm());
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cipher.init(Cipher.DECRYPT_MODE, privateKey);
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int inputLen = data.length;
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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int offSet = 0;
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byte[] cache;
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int i = 0;
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// 对数据分段解密
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while (inputLen - offSet > 0) {
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if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
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cache = cipher.doFinal(data, offSet, MAX_DECRYPT_BLOCK);
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} else {
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cache = cipher.doFinal(data, offSet, inputLen - offSet);
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}
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out.write(cache, 0, cache.length);
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i++;
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offSet = i * MAX_DECRYPT_BLOCK;
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}
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byte[] decryptedData = out.toByteArray();
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out.close();
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// 返回UTF-8编码的解密信息
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return new String(decryptedData, StandardCharsets.UTF_8);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 私钥加密 如果大于245则分段加密
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*/
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public static String encryptByPrivate(String encryptingStr, String privateKeyStr) {
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try {
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byte[] privateKeyBytes = decryptBase64(privateKeyStr);
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// 获得私钥
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PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(privateKeyBytes);
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// 取得待加密数据
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byte[] data = encryptingStr.getBytes(StandardCharsets.UTF_8);
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KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
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PrivateKey privateKey = factory.generatePrivate(keySpec);
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// 对数据加密
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Cipher cipher = Cipher.getInstance(factory.getAlgorithm());
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cipher.init(Cipher.ENCRYPT_MODE, privateKey);
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int inputLen = data.length;
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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int offSet = 0;
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byte[] cache;
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int i = 0;
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// 对数据分段加密
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while (inputLen - offSet > 0) {
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if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {
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cache = cipher.doFinal(data, offSet, MAX_ENCRYPT_BLOCK);
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} else {
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cache = cipher.doFinal(data, offSet, inputLen - offSet);
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}
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out.write(cache, 0, cache.length);
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i++;
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offSet = i * MAX_ENCRYPT_BLOCK;
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}
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byte[] encryptedData = out.toByteArray();
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out.close();
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// 返回加密后由Base64编码的加密信息
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return encryptBase64(encryptedData);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 公钥解密 如果大于256则分段解密
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*/
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public static String decryptByPublic(String encryptedStr, String publicKeyStr) {
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try {
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// 对公钥解密
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byte[] publicKeyBytes = decryptBase64(publicKeyStr);
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// 取得公钥
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X509EncodedKeySpec keySpec = new X509EncodedKeySpec(publicKeyBytes);
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// 取得待加密数据
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byte[] data = decryptBase64(encryptedStr);
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KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
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PublicKey publicKey = factory.generatePublic(keySpec);
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// 对数据解密
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Cipher cipher = Cipher.getInstance(factory.getAlgorithm());
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cipher.init(Cipher.DECRYPT_MODE, publicKey);
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int inputLen = data.length;
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ByteArrayOutputStream out = new ByteArrayOutputStream();
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int offSet = 0;
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byte[] cache;
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int i = 0;
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// 对数据分段解密
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while (inputLen - offSet > 0) {
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if (inputLen - offSet > MAX_DECRYPT_BLOCK) {
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cache = cipher.doFinal(data, offSet, MAX_DECRYPT_BLOCK);
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} else {
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cache = cipher.doFinal(data, offSet, inputLen - offSet);
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}
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out.write(cache, 0, cache.length);
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i++;
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offSet = i * MAX_DECRYPT_BLOCK;
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}
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byte[] decryptedData = out.toByteArray();
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out.close();
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// 返回UTF-8编码的解密信息
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return new String(decryptedData, StandardCharsets.UTF_8);
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} catch (Exception e) {
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e.printStackTrace();
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}
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return null;
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}
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/**
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* 用私钥对加密数据进行签名
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*/
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public static String sign(String encryptedStr, String privateKey) {
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String str = "";
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try {
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//将私钥加密数据字符串转换为字节数组
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byte[] data = encryptedStr.getBytes();
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// 解密由base64编码的私钥
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byte[] bytes = decryptBase64(privateKey);
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// 构造PKCS8EncodedKeySpec对象
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PKCS8EncodedKeySpec pkcs = new PKCS8EncodedKeySpec(bytes);
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// 指定的加密算法
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KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
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// 取私钥对象
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PrivateKey key = factory.generatePrivate(pkcs);
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// 用私钥对信息生成数字签名
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Signature signature = Signature.getInstance(KEY_RSA_SIGNATURE);
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signature.initSign(key);
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signature.update(data);
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str = encryptBase64(signature.sign());
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} catch (Exception e) {
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e.printStackTrace();
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}
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return str;
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}
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/**
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* 校验数字签名
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*
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* @return 校验成功返回true，失败返回false
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*/
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public static boolean verify(String encryptedStr, String publicKey, String sign) {
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boolean flag = false;
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try {
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//将私钥加密数据字符串转换为字节数组
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byte[] data = encryptedStr.getBytes();
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// 解密由base64编码的公钥
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byte[] bytes = decryptBase64(publicKey);
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// 构造X509EncodedKeySpec对象
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X509EncodedKeySpec keySpec = new X509EncodedKeySpec(bytes);
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// 指定的加密算法
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KeyFactory factory = KeyFactory.getInstance(KEY_RSA);
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// 取公钥对象
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PublicKey key = factory.generatePublic(keySpec);
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// 用公钥验证数字签名
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Signature signature = Signature.getInstance(KEY_RSA_SIGNATURE);
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signature.initVerify(key);
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signature.update(data);
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flag = signature.verify(decryptBase64(sign));
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} catch (Exception e) {
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e.printStackTrace();
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}
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return flag;
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}
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/**
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* 功能描述:格式化公私钥 C++格式
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* 公钥字符串开头要加上“-----BEGIN PUBLIC KEY-----\n”，结尾加上“\n-----END PUBLIC KEY-----\n”
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* 私钥字符串开头要加上“-----BEGIN RSA PRIVATE KEY-----\n”，结尾加上“\n-----END RSA PRIVATE KEY-----\n”
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*
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* @param str 要格式的字符串, flag
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* @param flag true为公 false为私
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* @return java.lang.String
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* @author xiaobu
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* @date 2020/3/18 16:40
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* @version 1.0
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*/
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public static String formatStr(String str, boolean flag) {
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StringBuilder sb = new StringBuilder(str);
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for (int i = 0, len = sb.length(); i < len; i++) {
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if (i % 64 == 0) {
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sb.insert(i, "\n");
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}
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}
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if (flag) {
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sb = new StringBuilder("-----BEGIN PUBLIC KEY-----").append(sb).append("\n-----END PUBLIC KEY-----\n");
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} else {
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sb = new StringBuilder("-----BEGIN RSA PRIVATE KEY-----").append(sb).append("\n-----END RSA PRIVATE KEY-----\n");
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}
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return sb.toString();
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}
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}
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