package com.box.common.core.rsa;
import com.alibaba.fastjson.JSONObject;
import com.alibaba.fastjson.serializer.SerializerFeature;
import lombok.extern.slf4j.Slf4j;
import sun.misc.BASE64Decoder;
import java.io.ByteArrayOutputStream;
import java.security.Key;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.PrivateKey;
import java.security.PublicKey;
import java.security.Signature;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.HashMap;
import java.util.Map;
import javax.crypto.Cipher;
/**
* RSA签名验签类
*/
@Slf4j
public class RSASignatureUtil {
/**
* 加密算法RSA
*/
public static final String KEY_ALGORITHM = "RSA";
/**
* 签名算法
*/
public static final String SIGNATURE_ALGORITHM = "MD5withRSA";
/**
* 获取公钥的key
*/
private static final String PUBLIC_KEY = "RSAPublicKey";
/**
* 获取私钥的key
*/
private static final String PRIVATE_KEY = "RSAPrivateKey";
/**
* 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;
/**
* <p>
* 生成密钥对(公钥和私钥)
* </p>
*
* @return
* @throws Exception
*/
public static Map<String, Object> genKeyPair() 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();
Map<String, Object> keyMap = new HashMap<String, Object>(2);
keyMap.put(PUBLIC_KEY, publicKey);
keyMap.put(PRIVATE_KEY, privateKey);
return keyMap;
}
/**
* <p>
* 用私钥对信息生成数字签名
* </p>
*
* @param data 已加密数据
* @param privateKey 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static String sign(byte[] data, String privateKey) {
try {
byte[] keyBytes = Base64Utils.decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PrivateKey privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initSign(privateK);
signature.update(data);
return Base64Utils.encode(signature.sign());
}catch (Exception e){
e.printStackTrace();
}
return "";
}
/**
* <p>
* 校验数字签名
* </p>
*
* @param data 已加密数据
* @param publicKey 公钥(BASE64编码)
* @param sign 数字签名
* @return
* @throws Exception
*/
public static boolean verify(byte[] data, String publicKey, String sign) {
try {
byte[] keyBytes = Base64Utils.decode(publicKey);
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
PublicKey publicK = keyFactory.generatePublic(keySpec);
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initVerify(publicK);
signature.update(data);
return signature.verify(Base64Utils.decode(sign));
} catch (Exception e) {
log.error("验证签名错误",e);
}
return false;
}
/**
* <P>
* 私钥解密
* </p>
*
* @param encryptedData 已加密数据
* @param privateKey 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static String decryptByPrivateKey(String encryptedData, String privateKey)throws Exception{
return new String(decryptByPrivateKey(Base64Utils.decode(encryptedData),privateKey));
}
private static byte[] decryptByPrivateKey(byte[] encryptedData, String privateKey)
throws Exception {
byte[] keyBytes = Base64Utils.decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, privateK);
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 decryptedData;
}
/**
* <p>
* 公钥解密
* </p>
*
* @param encryptedData 已加密数据
* @param publicKey 公钥(BASE64编码)
* @return
* @throws Exception
*/
public static String decryptByPublicKey(String encryptedData, String publicKey) throws Exception{
return new String(decryptByPublicKey(Base64Utils.decode(encryptedData),publicKey));
}
public static byte[] decryptByPublicKey(byte[] encryptedData, String publicKey)
throws Exception {
byte[] keyBytes = Base64Utils.decode(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.DECRYPT_MODE, publicK);
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 decryptedData;
}
/**
* <p>
* 公钥加密
* </p>
*
* @param data 源数据
* @param publicKey 公钥(BASE64编码)
* @return
* @throws Exception
*/
public static String encryptByPublicKey(String data, String publicKey)throws Exception{
return Base64Utils.encode(encryptByPublicKey(data.getBytes(),publicKey)).toString();
}
private static byte[] encryptByPublicKey(byte[] data, String publicKey)
throws Exception {
byte[] keyBytes = Base64Utils.decode(publicKey);
X509EncodedKeySpec x509KeySpec = new X509EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key publicK = keyFactory.generatePublic(x509KeySpec);
// 对数据加密
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, publicK);
int inputLen = data.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(data, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
return encryptedData;
}
/**
* <p>
* 私钥加密
* </p>
*
* @param data 源数据
* @param privateKey 私钥(BASE64编码)
* @return
* @throws Exception
*/
public static String encryptByPrivateKey(String data, String privateKey)
throws Exception {
return Base64Utils.encode(encryptByPrivateKey(data.getBytes(),privateKey)).toString();
}
private static byte[] encryptByPrivateKey(byte[] data, String privateKey)
throws Exception {
byte[] keyBytes = Base64Utils.decode(privateKey);
PKCS8EncodedKeySpec pkcs8KeySpec = new PKCS8EncodedKeySpec(keyBytes);
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORITHM);
Key privateK = keyFactory.generatePrivate(pkcs8KeySpec);
Cipher cipher = Cipher.getInstance(keyFactory.getAlgorithm());
cipher.init(Cipher.ENCRYPT_MODE, privateK);
int inputLen = data.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(data, offSet, MAX_ENCRYPT_BLOCK);
} else {
cache = cipher.doFinal(data, offSet, inputLen - offSet);
}
out.write(cache, 0, cache.length);
i++;
offSet = i * MAX_ENCRYPT_BLOCK;
}
byte[] encryptedData = out.toByteArray();
out.close();
return encryptedData;
}
/**
* <p>
* 获取私钥
* </p>
*
* @param keyMap 密钥对
* @return
* @throws Exception
*/
public static String getPrivateKey(Map<String, Object> keyMap)
throws Exception {
Key key = (Key) keyMap.get(PRIVATE_KEY);
return Base64Utils.encode(key.getEncoded());
}
/**
* <p>
* 获取公钥
* </p>
*
* @param keyMap 密钥对
* @return
* @throws Exception
*/
public static String getPublicKey(Map<String, Object> keyMap)
throws Exception {
Key key = (Key) keyMap.get(PUBLIC_KEY);
return Base64Utils.encode(key.getEncoded());
}
public static void main(String[] args) {
JSONObject param = new JSONObject();
param.put("deviceId", "12312973");
param.put("offsetPage", "1");
param.put("pageSize", "10");
param.put("merchant_no","123456");
System.out.println(JSONObject.toJSONString(param, SerializerFeature.SortField.MapSortField));
try {
/*
Map<String, Object> keyMap = RSASignatureUtil.genKeyPair();
String publicKey = RSASignatureUtil.getPublicKey(keyMap);
String privateKey = RSASignatureUtil.getPrivateKey(keyMap);
System.err.println("公钥: " + publicKey);
System.err.println("私钥： " + privateKey);
System.err.println("公钥加密——私钥解密");
String source = "这是一行没有任何意义的文字，你看完了等于没看，不是吗？";
System.out.println(" 加密前文字： " + source);
String encodedData = RSASignatureUtil.encryptByPublicKey(source, publicKey);
System.out.println("加密后文字： " + encodedData);
String decodedData = RSASignatureUtil.decryptByPrivateKey(encodedData, privateKey);
System.out.println("解密后文字: " + decodedData);
encodedData = RSASignatureUtil.encryptByPrivateKey(param.toJSONString(), privateKey);
System.out.println("加密后：" + encodedData);
decodedData = RSASignatureUtil.decryptByPublicKey(encodedData, publicKey);
System.out.println("解密后：" + decodedData);
*/
//公钥:
String pu = "MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCseCw4mhuvsy1rdrf4NC2RdhFCiC/ngefjworjZnRTc83aD5bUH/H4ewYVvaTXT2/eIiN93+SL/UC9asLsRXxV9rG99TltWWtaVR3ATB7bYQkUw0O+7ogbP+nAbIPGiuWopOPoIlHuCdaJJ1argNd9Od88QQnM1gtdRFwP9YuXdQIDAQAB";
// 私钥：
String pr = "MIICdwIBADANBgkqhkiG9w0BAQEFAASCAmEwggJdAgEAAoGBAKx4LDiaG6+zLWt2t/g0LZF2EUKIL+eB5+PCiuNmdFNzzdoPltQf8fh7BhW9pNdPb94iI33f5Iv9QL1qwuxFfFX2sb31OW1Za1pVHcBMHtthCRTDQ77uiBs/6cBsg8aK5aik4+giUe4J1oknVquA13053zxBCczWC11EXA/1i5d1AgMBAAECgYBCuPMSqrwPSxhFPNaLVVRTtAOVY650t9MIUBj/RIG4T1LSC7nkMr+fy6hc/NMq4PZ8T2S/q8B1T/Kd1RG36mHhFT+MbLdLowUL6kUmMrNpZ91V0TT/+3R5p4tlot8FVp23mwerxST+aOksbEZYU/HQ+x9wkp4wH8m1QIGNBB5IeQJBANdjIF1ivwzjQcpyjT+kNAWwiwYfY1d+SGzor6kSHZRhhUBLRboDSz2RxrPPr8aZfOh1CnN31koZVDkgCNxzptcCQQDM/WDTmHrH3rgKjAPbVKrrFGLmc2fNhG48ykmL4i3dGfSoCA6egBNR9RnLztPhuFkANdWd2AyUIDA9BmCAHEaTAkAnF8fNC1ovxaOwUgBPF8eVbMie8N2ACNyuX8FaR3506wpbdA4Qx/5FC4tsIXr+6ebg7jVaZdrQEi7WO3lAQgF7AkEAx9j6zi+o/DT5bmbk168q1vbQGOZIPAgxRRjeLP88QYOtjygTwJkSvONc2+LvlO8Z7eeONE3OrZbYEJan/B4U+wJBAISZapra3LMk0CnKHk5dRUyUanmKP+6RbH00Zmh9z15u5S6JGDGekwppySnqmeOQ1RfFr1a7sWH093kvjEOuVN8=";
String aa ="";
//System.out.println("aa:"+ RSASignatureUtil.decryptByPublicKey(aa, pr));
String sign = RSASignatureUtil.sign(JSONObject.toJSONString(param, SerializerFeature.SortField.MapSortField).getBytes(), pr);
System.err.println("签名：" + sign);
boolean status = RSASignatureUtil.verify(JSONObject.toJSONString(param, SerializerFeature.SortField.MapSortField).getBytes(), pu, sign);
System.err.println("签名验证结果：" + status);
} catch (Exception e) {
e.printStackTrace();
}
}
}
RSA 工具类
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