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Information2 United Data Management Platform SDK for Java
package com.i2soft.util;
import com.i2soft.common.Auth;
import com.i2soft.http.Client;
import com.i2soft.http.I2Rs;
import com.i2soft.http.Response;
import org.apache.commons.codec.binary.Base64;
import javax.crypto.Cipher;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.security.KeyFactory;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
/**
* https://blog.csdn.net/panjiapengfly/article/details/75318930
*/
public class Rsa {
private String priKey = "";
private String pubKey = "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA5fU404fG3lxBsT5xzY9DKj71SKR89T0/vXMgXaVNxUzOZWMj7jk97gqgcl+KghWNs0WtDLSVfSZTpIUEZDd8lAwMNUJ3rgLSeYEFxiYyA1C2jzt1pGxFQLuPtyMrRtkz1T/WmVjvgxnxrupYofh0blJIrcQdn86UMClxcD7+tPklTORjd24WVNrCt/x3zjR1oX68RYhhE1uBcVcFxjC0AXDjCiMonN31C981+9lmxr5sXRqFgrp0SmVURjoGnAIq00fqsd3VS5U6SZfNbzj9kvjOsyZDMTSusd33J7sz7ClrZs/2rYVW4FIrTOtAPqnbLBbsgZB2l0fAzCyzSOlTawIDAQAB";
private String encryptMethod = "Rsa/ECB/PKCS1Padding"; // 默认Padding
public Rsa() {
// 读取缓存公钥文件
String FilePath = Auth.getCachePath() + File.separator + "pub_key.json";
File pubKeyFile = new File(FilePath);
// long timeStamp = System.currentTimeMillis() / 1000;
StringMap pubKeyJson = null;
if (pubKeyFile.exists()) {
try {
pubKeyJson = IOHelper.readJsonFile(pubKeyFile);
} catch (IOException e) {
throw new RuntimeException(e);
}
// 存在缓存文件则使用文件中的内容作为公钥信息
if (pubKeyJson.get("public_key") != null) {
this.pubKey = pubKeyJson.get("public_key").toString();
this.encryptMethod = pubKeyJson.get("encrypt_method").toString();
}
} else {
// 获取公钥失败则使用内置默认公钥，接口存在公钥返回则使用RSA/ECB/OAEPPadding，否则为ECB/PKCS1Padding
String url = String.format("%s/sys/public_settings", Auth.getCcUrlDefault());
Client client = Auth.getClientDefault();
try {
pubKeyJson = new StringMap();
Response r = client.get(url, new StringMap());
I2Rs.I2PublicRs result = r.jsonToObject(I2Rs.I2PublicRs.class);
if (result != null && result.pubKey != null) {
String keyTrimmed = result.pubKey.trim()
.replaceAll(System.lineSeparator(), "")
.replace("\\\\n", "")
.replace("-----BEGIN PUBLIC KEY-----", "")
.replace("-----END PUBLIC KEY-----", "")
.replace("\\u003d", "=");
if (!keyTrimmed.isEmpty()) {
this.pubKey = keyTrimmed;
this.encryptMethod = "RSA/ECB/OAEPPadding";
}
}
pubKeyJson.put("encrypt_method", this.encryptMethod);
pubKeyJson.put("public_key", this.pubKey);
// pubKeyJson.put("time", timeStamp);
IOHelper.saveJsonFile(new File(FilePath), pubKeyJson);
} catch (IOException e) {
throw new RuntimeException(e);
}
}
}
/**
* 使用私钥加密
*/
public String encryptByPrivateKey(String data) {
// 加密
String str = "";
try {
byte[] pribyte = base64decode(priKey.trim());
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(pribyte);
KeyFactory fac = KeyFactory.getInstance("Rsa");
RSAPrivateKey privateKey = (RSAPrivateKey) fac.generatePrivate(keySpec);
Cipher c1 = Cipher.getInstance("Rsa/ECB/PKCS1Padding");
c1.init(Cipher.ENCRYPT_MODE, privateKey);
str = base64encode(c1.doFinal(data.getBytes()));
} catch (Exception e) {
e.printStackTrace();
}
return str;
}
/**
* 使用私钥解密
*/
public String decryptByPrivateKey(String data) {
// 解密
String str = "";
try {
byte[] pribyte = base64decode(priKey.trim());
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(pribyte);
KeyFactory fac = KeyFactory.getInstance("Rsa");
RSAPrivateKey privateKey = (RSAPrivateKey) fac.generatePrivate(keySpec);
Cipher c1 = Cipher.getInstance("RSA/ECB/OAEPPadding");
c1.init(Cipher.DECRYPT_MODE, privateKey);
byte[] temp = c1.doFinal(base64decode(data));
str = new String(temp);
} catch (Exception e) {
e.printStackTrace();
}
return str;
}
/**
* 使用公钥加密（实际API加密字段均使用此方法）
*/
public String encryptByPublicKey(String data) {
// 加密
String str = "";
try {
byte[] pubbyte = base64decode(pubKey.trim());
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(pubbyte);
KeyFactory fac = KeyFactory.getInstance("Rsa");
RSAPublicKey rsaPubKey = (RSAPublicKey) fac.generatePublic(keySpec);
Cipher c1 = Cipher.getInstance(encryptMethod);
// OAEPParameterSpec oaepParams = getOAEPParameterSpec("RSA/ECB/OAEPPadding", null);
c1.init(Cipher.ENCRYPT_MODE, rsaPubKey);
str = base64encode(c1.doFinal(data.getBytes()));
} catch (Exception e) {
e.printStackTrace();
}
return str;
}
/**
* 使用公钥解密
*/
public String decryptByPublicKey(String data) {
// 加密
String str = "";
try {
byte[] pubbyte = base64decode(pubKey.trim());
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(pubbyte);
KeyFactory fac = KeyFactory.getInstance("Rsa");
RSAPublicKey rsaPubKey = (RSAPublicKey) fac.generatePublic(keySpec);
Cipher c1 = Cipher.getInstance("Rsa/ECB/PKCS1Padding");
c1.init(Cipher.DECRYPT_MODE, rsaPubKey);
byte[] temp = c1.doFinal(base64decode(data));
str = new String(temp);
} catch (Exception e) {
e.printStackTrace();
}
return str;
}
/**
* 本方法使用SHA1withRSA签名算法产生签名
*
* @param src: 签名的原字符串
* @return String 签名的返回结果(16进制编码)。当产生签名出错的时候，返回null。
*/
public String signByPrivateKey(String src) {
try {
Signature sigEng = Signature.getInstance("SHA1withRSA");
byte[] pribyte = base64decode(priKey.trim());
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(pribyte);
KeyFactory fac = KeyFactory.getInstance("Rsa");
RSAPrivateKey privateKey = (RSAPrivateKey) fac.generatePrivate(keySpec);
sigEng.initSign(privateKey);
sigEng.update(src.getBytes());
byte[] signature = sigEng.sign();
return base64encode(signature);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* 使用共钥验证签名
*
* @param sign :
* @param src :
* @return :
*/
public boolean verifyByPublicKey(String sign, String src) {
try {
Signature sigEng = Signature.getInstance("SHA1withRSA");
byte[] pubbyte = base64decode(pubKey.trim());
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(pubbyte);
KeyFactory fac = KeyFactory.getInstance("Rsa");
RSAPublicKey rsaPubKey = (RSAPublicKey) fac.generatePublic(keySpec);
sigEng.initVerify(rsaPubKey);
sigEng.update(src.getBytes());
byte[] sign1 = base64decode(sign);
return sigEng.verify(sign1);
} catch (Exception e) {
e.printStackTrace();
return false;
}
}
/**
* base64加密
*
* @param bt:
* @return :
*/
@SuppressWarnings("restriction")
private String base64encode(byte[] bt) {
// String str = new sun.misc.BASE64Encoder().encode(bstr);
// Base64.encodeBase64();
String str = Base64.encodeBase64String(bt);
str = str.replaceAll("\r\n", "").replaceAll("\r", "").replaceAll("\n", "");
return str;
}
/**
* base64解密
*
* @param str:
* @return byte[]
*/
@SuppressWarnings("restriction")
private byte[] base64decode(String str) {
byte[] bt = null;
try {
// sun.misc.BASE64Decoder decoder = new sun.misc.BASE64Decoder();
// bt = decoder.decodeBuffer(str);
bt = Base64.decodeBase64(str.getBytes("UTF-8"));
} catch (IOException e) {
e.printStackTrace();
}
return bt;
}
/**
* 从文件中读取所有字符串
*
* @param fileName:
* @return String
*/
private String readStringFromFile(String fileName) {
StringBuilder str = null;
try {
File file = new File(fileName);
FileInputStream fis = new FileInputStream(file);
InputStreamReader isr = new InputStreamReader(fis, StandardCharsets.UTF_8);
BufferedReader br = new BufferedReader(isr);
String line;
str = new StringBuilder();
while ((line = br.readLine()) != null) {
str.append(line);
str.append(System.lineSeparator());
}
br.close();
return str.toString();
} catch (IOException e) {
e.printStackTrace();
}
return "";
}
public void writeStringToFile(String fileName, String content) {
// overwrite the file content
try {
File file = new File(fileName);
FileWriter fw = new FileWriter(file);
fw.write(content);
fw.flush();
fw.close();
} catch (IOException e) {
e.printStackTrace();
}
}
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