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251 lines
9.0 KiB
251 lines
9.0 KiB
package com.ynxbd.common.helper.rsa;
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import com.ynxbd.common.helper.common.ErrorHelper;
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import lombok.extern.slf4j.Slf4j;
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import org.apache.commons.codec.binary.Base64;
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import org.apache.commons.lang3.ObjectUtils;
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import javax.crypto.Cipher;
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import java.net.URLEncoder;
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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非对称加密
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*
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* @Author wsq
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* @Date 2021/07/28 11:01:28
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* @Copyright @ 2020 云南新八达科技有限公司 All rights reserved.
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*/
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@Slf4j
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public class RSAHelper {
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private RSAHelper() {
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}
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private static final int KEY_LENGTH = 1024;
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private static final Map<Integer, String> KEY_MAP = new HashMap<>(); // 用于封装随机产生的公钥与私钥
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static {
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try {
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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(KEY_LENGTH, 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 publicKeyStr = new String(Base64.encodeBase64(publicKey.getEncoded()));
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// 得到私钥字符串
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String privateKeyStr = new String(Base64.encodeBase64((privateKey.getEncoded())));
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// 将公钥和私钥保存到Map
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KEY_MAP.put(0, publicKeyStr); // 0表示公钥
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KEY_MAP.put(1, privateKeyStr); // 1表示私钥
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} catch (Exception e) {
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ErrorHelper.println(e);
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}
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}
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public static final String RSA_ECB_PKCS1Padding = "RSA/ECB/PKCS1Padding";
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/**
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* 获取公钥
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*
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* @return 公钥
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*/
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public static String getPublicKey() {
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return KEY_MAP.get(0);
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}
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/**
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* 获取私钥
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*
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* @return 私钥
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*/
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public static String getPrivateKey() {
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return KEY_MAP.get(1);
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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 encryptData 加密数据
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* @return 密文
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*/
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public static String encrypt(String encryptData) {
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return encrypt(encryptData, getPublicKey());
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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 encryptData 加密数据
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* @return 密文
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*/
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public static String encrypt(String encryptData, String publicKey) {
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if (ObjectUtils.isEmpty(encryptData)) {
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return null;
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}
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try {
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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").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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return Base64.encodeBase64String(cipher.doFinal(encryptData.getBytes(StandardCharsets.UTF_8)));
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} catch (Exception e) {
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log.error("[RSA]加密失败:[{}]", e.getMessage());
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}
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return null;
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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 decryptData 加密数据
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* @return 明文
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*/
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public static String decrypt(String decryptData) {
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return decrypt(decryptData, getPrivateKey());
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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 decryptData 加密数据
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* @return 明文
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*/
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public static String decrypt(String decryptData, String privateKey) {
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if (ObjectUtils.isEmpty(decryptData)) {
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return null;
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}
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try {
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// 64位解码加密后的字符串
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byte[] inputByte = Base64.decodeBase64(decryptData.getBytes(StandardCharsets.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").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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return new String(cipher.doFinal(inputByte));
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} catch (Exception e) {
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log.error("[RSA]解密失败:[{}]", e.getMessage());
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}
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return null;
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}
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public static String URLEncode(String data) {
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try {
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if (ObjectUtils.isEmpty(data)) return null;
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return URLEncoder.encode(data, String.valueOf(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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public static PublicKey getPublicKey(String base64PubKey) {
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try {
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byte[] keyBytes = java.util.Base64.getDecoder().decode(base64PubKey);
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X509EncodedKeySpec spec = new X509EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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return keyFactory.generatePublic(spec);
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} catch (Exception e) {
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log.error("", e);
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return null;
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}
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}
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/**
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* PKCS8 格式私钥字符串转 PrivateKey
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*
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* @param privateKeyStr 带/不带头尾标记的base64私钥
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* @return PrivateKey
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*/
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public static PrivateKey getPrivateKey(String privateKeyStr) {
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try {
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// 去除头尾标记、换行、空格
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String privateKeyPEM = privateKeyStr
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.replace("-----BEGIN PRIVATE KEY-----", "")
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.replace("-----END PRIVATE KEY-----", "")
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.replaceAll("\\s+", "");
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byte[] keyBytes = java.util.Base64.getDecoder().decode(privateKeyPEM);
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PKCS8EncodedKeySpec spec = new PKCS8EncodedKeySpec(keyBytes);
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KeyFactory keyFactory = KeyFactory.getInstance("RSA");
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return keyFactory.generatePrivate(spec);
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} catch (Exception e) {
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log.error("", e);
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return null;
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}
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}
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// 加密方法（PKCS#1 v1.5填充）[对应前端JS加密]
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public static byte[] enPKCS1PaddingToByte(String content, String base64PublicKey) throws Exception {
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return enPKCS1PaddingToByte(content, getPublicKey(base64PublicKey));
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}
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public static byte[] enPKCS1PaddingToByte(String content, PublicKey publicKey) throws Exception {
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Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
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cipher.init(Cipher.ENCRYPT_MODE, publicKey);
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byte[] data = content.getBytes(StandardCharsets.UTF_8);
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return cipher.doFinal(data);
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}
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// 加密方法（PKCS#1 v1.5填充）[对应前端JS加密]
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public static String enPKCS1Padding(String content, PublicKey publicKey) throws Exception {
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byte[] data = enPKCS1PaddingToByte(content, publicKey);
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return java.util.Base64.getEncoder().encodeToString(data);
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}
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// 解密方法
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public static String dePKCS1Padding(String encryptedText, PrivateKey privateKey) throws Exception {
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Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
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cipher.init(Cipher.DECRYPT_MODE, privateKey);
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byte[] decryptedBytes = cipher.doFinal(java.util.Base64.getDecoder().decode(encryptedText));
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return new String(decryptedBytes, StandardCharsets.UTF_8);
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}
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// 去除空格、制表符、换行符等连续或多个空白符
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public static String replaceKey(String key) {
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if (key == null) return null;
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return key.replaceAll("\\s+", "");
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}
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public static void main(String[] args) throws Exception {
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// System.out.println("随机生成的公钥为:" + KEY_MAP.get(0));
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// System.out.println("随机生成的私钥为:" + KEY_MAP.get(1));
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}
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// public static void main(String[] args) 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
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// Cipher cipher = Cipher.getInstance("RSA");
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// cipher.init(Cipher.ENCRYPT_MODE, pubKey);
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//
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// String a = Base64.encodeBase64String(cipher.doFinal("encryptData".getBytes(StandardCharsets.UTF_8)));
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// System.out.println(a);
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//
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// String b = Base64.encodeBase64String(cipher.doFinal("encryptData".getBytes(StandardCharsets.UTF_8)));
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// System.out.println(a);
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//
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// String c = Base64.encodeBase64String(cipher.doFinal("encryptData".getBytes(StandardCharsets.UTF_8)));
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// System.out.println(a);
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//
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// String d = Base64.encodeBase64String(cipher.doFinal("encryptData".getBytes(StandardCharsets.UTF_8)));
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// System.out.println(a);
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// }
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}
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