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IJPay 让支付触手可及(Easy Pay Library)-核心工具包
package com.ijpay.core.kit;
import cn.hutool.core.codec.Base64;
import cn.hutool.core.util.StrUtil;
import javax.crypto.Cipher;
import java.io.ByteArrayOutputStream;
import java.math.BigInteger;
import java.nio.charset.StandardCharsets;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.*;
import java.util.HashMap;
import java.util.Map;
/**
* IJPay 让支付触手可及，封装了微信支付、支付宝支付、银联支付常用的支付方式以及各种常用的接口。
*
* 不依赖任何第三方 mvc 框架，仅仅作为工具使用简单快速完成支付模块的开发，可轻松嵌入到任何系统里。
*
* IJPay 交流群: 723992875、864988890
*
* Node.js 版: https://gitee.com/javen205/TNWX
*
* RSA 非对称加密工具类
*
* @author Javen
*/
public class RsaKit {
/**
* 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
*/
private static final int MAX_DECRYPT_BLOCK = 128;
/**
* 加密算法RSA
*/
private static final String KEY_ALGORITHM = "RSA";
/**
* 生成公钥和私钥
*
* @throws Exception 异常信息
*/
public static Map getKeys() throws Exception {
KeyPairGenerator keyPairGen = KeyPairGenerator.getInstance(KEY_ALGORITHM);
keyPairGen.initialize(1024);
KeyPair keyPair = keyPairGen.generateKeyPair();
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
String publicKeyStr = getPublicKeyStr(publicKey);
String privateKeyStr = getPrivateKeyStr(privateKey);
Map map = new HashMap(2);
map.put("publicKey", publicKeyStr);
map.put("privateKey", privateKeyStr);
System.out.println("公钥\r\n" + publicKeyStr);
System.out.println("私钥\r\n" + privateKeyStr);
return map;
}
/**
* 使用模和指数生成RSA公钥
* 注意：【此代码用了默认补位方式，为RSA/None/PKCS1Padding，不同JDK默认的补位方式可能不同，如Android默认是RSA
* /None/NoPadding】
*
* @param modulus 模
* @param exponent 公钥指数
* @return {@link RSAPublicKey}
*/
public static RSAPublicKey getPublicKey(String modulus, String exponent) {
try {
BigInteger b1 = new BigInteger(modulus);
BigInteger b2 = new BigInteger(exponent);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
RSAPublicKeySpec keySpec = new RSAPublicKeySpec(b1, b2);
return (RSAPublicKey) keyFactory.generatePublic(keySpec);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* 使用模和指数生成RSA私钥
* 注意：【此代码用了默认补位方式，为RSA/None/PKCS1Padding，不同JDK默认的补位方式可能不同，如Android默认是RSA
* /None/NoPadding】
*
* @param modulus 模
* @param exponent 指数
* @return {@link RSAPrivateKey}
*/
public static RSAPrivateKey getPrivateKey(String modulus, String exponent) {
try {
BigInteger b1 = new BigInteger(modulus);
BigInteger b2 = new BigInteger(exponent);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
RSAPrivateKeySpec keySpec = new RSAPrivateKeySpec(b1, b2);
return (RSAPrivateKey) keyFactory.generatePrivate(keySpec);
} catch (Exception e) {
e.printStackTrace();
return null;
}
}
/**
* 公钥加密
*
* @param data 需要加密的数据
* @param publicKey 公钥
* @return 加密后的数据
* @throws Exception 异常信息
*/
public static String encryptByPublicKey(String data, String publicKey) throws Exception {
return encryptByPublicKey(data, publicKey, "RSA/ECB/PKCS1Padding");
}
/**
* 公钥加密
*
* @param data 需要加密的数据
* @param publicKey 公钥
* @return 加密后的数据
* @throws Exception 异常信息
*/
public static String encryptByPublicKeyByWx(String data, String publicKey) throws Exception {
return encryptByPublicKey(data, publicKey, "RSA/ECB/OAEPWITHSHA-1ANDMGF1PADDING");
}
/**
* 公钥加密
*
* @param data 需要加密的数据
* @param publicKey 公钥
* @param fillMode 填充模式
* @return 加密后的数据
* @throws Exception 异常信息
*/
public static String encryptByPublicKey(String data, String publicKey, String fillMode) throws Exception {
byte[] dataByte = data.getBytes(StandardCharsets.UTF_8);
byte[] keyBytes = Base64.decode(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key key = keyFactory.generatePublic(x509KeySpec);
// 对数据加密
Cipher cipher = Cipher.getInstance(fillMode);
cipher.init(Cipher.ENCRYPT_MODE, key);
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();
return StrUtil.str(Base64.encode(encryptedData));
}
/**
* 私钥签名
*
* @param data 需要加密的数据
* @param privateKey 私钥
* @return 加密后的数据
* @throws Exception 异常信息
*/
public static String encryptByPrivateKey(String data, String privateKey) throws Exception {
PKCS8EncodedKeySpec priPkcs8 = new PKCS8EncodedKeySpec(Base64.decode(privateKey));
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PrivateKey priKey = keyFactory.generatePrivate(priPkcs8);
java.security.Signature signature = java.security.Signature.getInstance("SHA256WithRSA");
signature.initSign(priKey);
signature.update(data.getBytes(StandardCharsets.UTF_8));
byte[] signed = signature.sign();
return StrUtil.str(Base64.encode(signed));
}
/**
* 私钥签名
*
* @param data 需要加密的数据
* @param privateKey 私钥
* @return 加密后的数据
* @throws Exception 异常信息
*/
public static String encryptByPrivateKey(String data, PrivateKey privateKey) throws Exception {
java.security.Signature signature = java.security.Signature.getInstance("SHA256WithRSA");
signature.initSign(privateKey);
signature.update(data.getBytes(StandardCharsets.UTF_8));
byte[] signed = signature.sign();
return StrUtil.str(Base64.encode(signed));
}
/**
* 公钥验证签名
*
* @param data 需要加密的数据
* @param sign 签名
* @param publicKey 公钥
* @return 验证结果
* @throws Exception 异常信息
*/
public static boolean checkByPublicKey(String data, String sign, String publicKey) throws Exception {
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
byte[] encodedKey = Base64.decode(publicKey);
PublicKey pubKey = keyFactory.generatePublic(new X509EncodedKeySpec(encodedKey));
java.security.Signature signature = java.security.Signature.getInstance("SHA256WithRSA");
signature.initVerify(pubKey);
signature.update(data.getBytes(StandardCharsets.UTF_8));
return signature.verify(Base64.decode(sign.getBytes(StandardCharsets.UTF_8)));
}
/**
* 公钥验证签名
*
* @param data 需要加密的数据
* @param sign 签名
* @param publicKey 公钥
* @return 验证结果
* @throws Exception 异常信息
*/
public static boolean checkByPublicKey(String data, String sign, PublicKey publicKey) throws Exception {
java.security.Signature signature = java.security.Signature.getInstance("SHA256WithRSA");
signature.initVerify(publicKey);
signature.update(data.getBytes(StandardCharsets.UTF_8));
return signature.verify(Base64.decode(sign.getBytes(StandardCharsets.UTF_8)));
}
/**
* 私钥解密
*
* @param data 需要解密的数据
* @param privateKey 私钥
* @return 解密后的数据
* @throws Exception 异常信息
*/
public static String decryptByPrivateKey(String data, String privateKey) throws Exception {
return decryptByPrivateKey(data, privateKey, "RSA/ECB/PKCS1Padding");
}
/**
* 私钥解密
*
* @param data 需要解密的数据
* @param privateKey 私钥
* @return 解密后的数据
* @throws Exception 异常信息
*/
public static String decryptByPrivateKeyByWx(String data, String privateKey) throws Exception {
return decryptByPrivateKey(data, privateKey, "RSA/ECB/OAEPWITHSHA-1ANDMGF1PADDING");
}
/**
* 私钥解密
*
* @param data 需要解密的数据
* @param privateKey 私钥
* @param fillMode 填充模式
* @return 解密后的数据
* @throws Exception 异常信息
*/
public static String decryptByPrivateKey(String data, String privateKey, String fillMode) throws Exception {
byte[] encryptedData = Base64.decode(data);
byte[] keyBytes = Base64.decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key key = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(fillMode);
cipher.init(Cipher.DECRYPT_MODE, key);
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();
return new String(decryptedData);
}
/**
* 从字符串中加载公钥
*
* @param publicKeyStr 公钥数据字符串
* @throws Exception 异常信息
*/
public static PublicKey loadPublicKey(String publicKeyStr) throws Exception {
try {
byte[] buffer = Base64.decode(publicKeyStr);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
return keyFactory.generatePublic(keySpec);
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此算法");
} catch (InvalidKeySpecException e) {
throw new Exception("公钥非法");
} catch (NullPointerException e) {
throw new Exception("公钥数据为空");
}
}
/**
* 从字符串中加载私钥
* 加载时使用的是PKCS8EncodedKeySpec（PKCS#8编码的Key指令）。
*
* @param privateKeyStr 私钥
* @return {@link PrivateKey}
* @throws Exception 异常信息
*/
public static PrivateKey loadPrivateKey(String privateKeyStr) throws Exception {
try {
byte[] buffer = Base64.decode(privateKeyStr);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
return keyFactory.generatePrivate(keySpec);
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此算法");
} catch (InvalidKeySpecException e) {
throw new Exception("私钥非法");
} catch (NullPointerException e) {
throw new Exception("私钥数据为空");
}
}
public static String getPrivateKeyStr(PrivateKey privateKey) {
return Base64.encode(privateKey.getEncoded());
}
public static String getPublicKeyStr(PublicKey publicKey) {
return Base64.encode(publicKey.getEncoded());
}
public static void main(String[] args) throws Exception {
Map keys = getKeys();
String publicKey = keys.get("publicKey");
String privateKey = keys.get("privateKey");
String content = "我是Javen,I am Javen";
String encrypt = encryptByPublicKey(content, publicKey);
String decrypt = decryptByPrivateKey(encrypt, privateKey);
System.out.println("加密之后：" + encrypt);
System.out.println("解密之后：" + decrypt);
System.out.println("======华丽的分割线=========");
content = "我是Javen,I am Javen";
encrypt = encryptByPublicKeyByWx(content, publicKey);
decrypt = decryptByPrivateKeyByWx(encrypt, privateKey);
System.out.println("加密之后：" + encrypt);
System.out.println("解密之后：" + decrypt);
//OPPO
String sign = encryptByPrivateKey(content, privateKey);
System.out.println("加密之后：" + sign);
System.out.println(checkByPublicKey(content, sign, publicKey));
}
}
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