RSA的非对称加密，公钥加密私钥解密，本地测试
2024-05-07 03:48:13
http://web.chacuo.net/netrsakeypair 公私钥生成地址package com.audaque.module.core.utils;
import org.apache.commons.codec.binary.Base64;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;import javax.crypto.Cipher;
import java.io.*;
import java.security.KeyFactory;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.cert.CertificateFactory;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;/*** RSA加密*/
public class RSAutils {private static final Logger LOGGER= LoggerFactory.getLogger(RSAutils.class);/*** RSA最大加密明文大小*/private static final int MAX_ENCRYPT_BLOCK = 117;/*** RSA最大解密密文大小（如果秘钥是1024bit,解密最大块是128,如果秘钥是2048bit,解密最大块是256）*/private static final int MAX_DECRYPT_BLOCK = 128;private static PrivateKey globalPrivateKey = null;private static PublicKey globalPublicKey = null;public static PrivateKey getPrivateKey(String prikeypath) throws Exception {if(globalPrivateKey != null){return globalPrivateKey;}String s="MIICeAIBADANBgkqhkiG9w0BAQEFAASCAmIwggJeAgEAAoGBAOpG5g48YmAR2TQG\n" +"JcGtZ6WSTXePd92zfgzGsxoMkzCYBkAs/EageCJoix0wQfgZW9bPUVjyHWCPfY/D\n" +"2W2Ax/dW1CkPi1QVLgB7IY0v9A2vgqYnP1EA/44TW/DdqHlYQK4488dsMlHH17jF\n" +"oFxzigWA6zmkk0Qxc4i3YvxxW3HXAgMBAAECgYEAs7VvA7yOOeN3GdEdZVP/DaMM\n" +"iYokCIyHRIWnHXRH9B6prNDVM9gkT0CideFuuUG6kSy22ePfZRKs3nr9bmI7AKhY\n" +"TTS4JR6AFBKL1NSrRmEEtTRFTaMU3IgSdP/JoOATwKKlPhZdjHDQ9/cDYCe4S9k5\n" +"mBjMULbxRtC4F3ePbQECQQD8SGY/QRc91Ggo7nUffGxH4cFNqmUGtT7v3aMV/kNz\n" +"Umz5MhuTYaUeBtU5l650ZLK+zCMYcHH+jfDcgKk8SrfjAkEA7bqU9RcaBEx20h5c\n" +"gJQsLbk5S61a6AbZLQgDtMTueJ/e3785Jmc6r4hUbuOSPPGRPkOqFvMwsf2PC5zd\n" +"eaI4fQJBAPl5ApsUW85JiALJ40oSeOUQKl4J3MMoYadC7a2m9L5KSPaXhUtVqLkr\n" +"mpjMFLiGh3dDWIUnVKKbbA4wsKmtXW8CQQDE8ixxl7/wC8DsdkbAJwEqqCa1cVq8\n" +"mt/VFKytV/EQcbHcv7kC/cZ6oYEBlPsUDjT71mbVOIgBDUUyo7RADoqpAkA8CVOV\n" +"ndCRoFqH7aHASSfh3mU66HuvBVRyrq/1tfAF3JzNeI3O/X8BVS8UGvQYs79znDwM\n" +"3A2dIIQE096gA/OE";InputStream in = new ByteArrayInputStream(s.getBytes());//RSAutils.class.getClassLoader().getResourceAsStream(prikeypath);BufferedReader br = new BufferedReader(new InputStreamReader(in));StringBuilder sb = new StringBuilder();String readLine = null;while((readLine = br.readLine()) != null) {if(readLine.charAt(0) != 45) {sb.append(readLine);sb.append('\r');}}in.close();PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(Base64.decodeBase64(sb.toString()));try {KeyFactory factory = KeyFactory.getInstance("RSA");PrivateKey privateKey = factory.generatePrivate(pkcs8EncodedKeySpec);globalPrivateKey = privateKey;return globalPrivateKey;} catch (Exception e) {LOGGER.error("获取私钥异常",e);throw e;}}public static PublicKey getPublicByPublic(String keypath) throws Exception {if(globalPublicKey != null){return globalPublicKey;}System.out.println(RSAutils.class.getClassLoader());String s="MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDqRuYOPGJgEdk0BiXBrWelkk13\n" +"j3fds34MxrMaDJMwmAZALPxGoHgiaIsdMEH4GVvWz1FY8h1gj32Pw9ltgMf3VtQp\n" +"D4tUFS4AeyGNL/QNr4KmJz9RAP+OE1vw3ah5WECuOPPHbDJRx9e4xaBcc4oFgOs5\n" +"pJNEMXOIt2L8cVtx1wIDAQAB";InputStream in = new ByteArrayInputStream(s.getBytes());//RSAutils.class.getClassLoader().getResourceAsStream(keypath);BufferedReader br = new BufferedReader(new InputStreamReader(in));StringBuilder sb = new StringBuilder();String readLine = null;while((readLine = br.readLine()) != null) {if(readLine.charAt(0) != 45) {sb.append(readLine);sb.append('\r');}}in.close();CertificateFactory certificateFactory = CertificateFactory.getInstance("X.509");X509EncodedKeySpec ks = new X509EncodedKeySpec(Base64.decodeBase64(sb.toString()));KeyFactory kf = KeyFactory.getInstance("RSA");http://localhost:8086/DQMS_library/front/inner/source_field/insertDateBaseFields.jhtml?fileId=22&_=1584511073990globalPublicKey = kf.generatePublic(ks);return globalPublicKey;}public static String dencrypt(String str,String privateKeyStr) throws Exception{//64位解码加密后的字符串byte[] encryptedData = Base64.decodeBase64(str.getBytes("UTF-8"));PrivateKey privateKey = getPrivateKey(privateKeyStr);//RSA加密Cipher cipher = Cipher.getInstance("RSA");cipher.init(Cipher.DECRYPT_MODE, privateKey);int inputLen = encryptedData.length;ByteArrayOutputStream out = new ByteArrayOutputStream();int offSet = 0;byte[] cache;int i = 0;// 对数据分段解密while (inputLen - offSet > 0) {if (inputLen - offSet > MAX_DECRYPT_BLOCK) {cache = cipher.doFinal(encryptedData, offSet, MAX_DECRYPT_BLOCK);} else {cache = cipher.doFinal(encryptedData, offSet, inputLen - offSet);}out.write(cache, 0, cache.length);i++;offSet = i * MAX_DECRYPT_BLOCK;}byte[] decryptedData = out.toByteArray();out.close();String outStr = new String(decryptedData,"UTF-8");return outStr;}public static String encrypt(String data, String publicKeyPath) throws Exception{PublicKey pubKey = getPublicByPublic(publicKeyPath);//RSA加密Cipher cipher = Cipher.getInstance("RSA");cipher.init(Cipher.ENCRYPT_MODE, pubKey);byte[] dataByte = data.getBytes("UTF-8");int inputLen = dataByte.length;ByteArrayOutputStream out = new ByteArrayOutputStream();int offSet = 0;byte[] cache;int i = 0;// 对数据分段加密while (inputLen - offSet > 0) {if (inputLen - offSet > MAX_ENCRYPT_BLOCK) {cache = cipher.doFinal(dataByte, offSet, MAX_ENCRYPT_BLOCK);} else {cache = cipher.doFinal(dataByte, offSet, inputLen - offSet);}out.write(cache, 0, cache.length);i++;offSet = i * MAX_ENCRYPT_BLOCK;}byte[] encryptedData = out.toByteArray();out.close();String outStr = Base64.encodeBase64String(encryptedData);return outStr;}public static void main(String[] args) throws Exception {//现在生成公私钥对,http://web.chacuo.net/netrsakeypairString data = "{\"appid\":\"10000\",\"columns\":[{\"columnId\":14991,\"columnName\":\"id\",\"columnRemark\":\"主键\"},{\"columnId\":14992,\"columnName\":\"data_source_name\",\"columnRemark\":\"\"},{\"columnId\":14993,\"columnName\":\"data_source_type\",\"columnRemark\":\"数据库类型\"},{\"columnId\":14994,\"columnName\":\"owner\",\"columnRemark\":\"用户名\"},{\"columnId\":14995,\"columnName\":\"display_text\",\"columnRemark\":\"备注名\"},{\"columnId\":14996,\"columnName\":\"guid\",\"columnRemark\":\"dayu主键\"},{\"columnId\":14997,\"columnName\":\"connection_guid\",\"columnRemark\":\"数据库连接guid\"},{\"columnId\":14998,\"columnName\":\"qualified_name\",\"columnRemark\":\"dayu唯一字段\"},{\"columnId\":14999,\"columnName\":\"remarks\",\"columnRemark\":\"备注\"},{\"columnId\":15000,\"columnName\":\"data_source_id\",\"columnRemark\":\"关联治理数据源ID\"},{\"columnId\":15001,\"columnName\":\"create_user\",\"columnRemark\":\"创建用户ID\"},{\"columnId\":15002,\"columnName\":\"create_time\",\"columnRemark\":\"创建日期时间\"},{\"columnId\":15003,\"columnName\":\"update_user\",\"columnRemark\":\"修改用户ID\"},{\"columnId\":15004,\"columnName\":\"update_time\",\"columnRemark\":\"修改日期时间\"},{\"columnId\":15005,\"columnName\":\"flag\",\"columnRemark\":\"数据状态（0：已删除 1：有效）\"},{\"columnId\":15025,\"columnName\":\"adqm_dayu_data_source_abc\",\"columnRemark\":\"\"}],\"timestamp\":1584942846781}";//使用公钥加密,第二个参数classpath下的公钥文件data = encrypt(data,"public1024.key");System.out.println("加密后的数据:"+data);//使用私钥解密,第二个参数classpath下的私钥文件data = dencrypt(data,"private1024.key");System.out.println("解密后的数据:"+data);String s="1584695311582";long s1=Long.valueOf(s);long time=System.currentTimeMillis();if (time-s1>60000){System.out.println("失效了");}}
}
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