com.hecloud.runtime.common.encryptor.RSAEncrptor Maven / Gradle / Ivy
package com.hecloud.runtime.common.encryptor;
import org.apache.commons.codec.binary.Base64;
import org.apache.commons.lang3.StringUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.io.BufferedReader;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.security.*;
import java.security.interfaces.RSAPrivateKey;
import java.security.interfaces.RSAPublicKey;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.PKCS8EncodedKeySpec;
import java.security.spec.X509EncodedKeySpec;
import java.util.Optional;
/**
* RSA加解密工具
*
* @author LoveinBJ
*/
public class RSAEncrptor {
/**
* 字节数据转字符串专用集合
*/
private static final char[] HEX_CHAR = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e',
'f'};
private static Logger logger = LoggerFactory.getLogger(RSAEncrptor.class);
/**
* 公钥加密过程
*
* @param publicKey 公钥
* @param plainTextData 明文
* @return 密文
* @throws Exception 运行异常 加密过程中的异常信息
*/
public static byte[] encrypt(RSAPublicKey publicKey, byte[] plainTextData) throws Exception {
if (publicKey == null) {
throw new Exception("加密公钥为空, 请设置");
}
Cipher cipher;
try {
// 使用默认RSA
cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
byte[] output = cipher.doFinal(plainTextData);
return output;
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此加密算法");
} catch (NoSuchPaddingException e) {
logger.error("NoSuchPaddingException", e);
throw new Exception("无此加密算法");
} catch (InvalidKeyException e) {
throw new Exception("加密公钥非法,请检查");
} catch (IllegalBlockSizeException e) {
throw new Exception("明文长度非法");
} catch (BadPaddingException e) {
throw new Exception("明文数据已损坏");
}
}
/**
* 私钥加密过程
*
* @param privateKey 私钥
* @param plainTextData 明文
* @return 密文
* @throws Exception 运行异常 加密过程中的异常信息
*/
public static byte[] encrypt(RSAPrivateKey privateKey, byte[] plainTextData) throws Exception {
Optional.ofNullable(privateKey).orElseThrow(() -> new Exception("加密私钥为空, 请设置"));
try {
// 使用默认RSA
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.ENCRYPT_MODE, privateKey);
byte[] output = cipher.doFinal(plainTextData);
return output;
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此加密算法");
} catch (NoSuchPaddingException e) {
logger.error("NoSuchPaddingException", e);
return null;
} catch (InvalidKeyException e) {
throw new Exception("加密私钥非法,请检查");
} catch (IllegalBlockSizeException e) {
throw new Exception("明文长度非法");
} catch (BadPaddingException e) {
throw new Exception("明文数据已损坏");
}
}
/**
* 私钥解密过程
*
* @param privateKey 私钥
* @param cipherData 密文
* @return 明文
* @throws Exception 运行异常 解密过程中的异常信息
*/
public static byte[] decrypt(RSAPrivateKey privateKey, byte[] cipherData) throws Exception {
Optional.ofNullable(privateKey).orElseThrow(() -> new Exception("解密私钥为空, 请设置"));
try {
// 使用默认RSA
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
byte[] output = cipher.doFinal(cipherData);
return output;
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此解密算法");
} catch (NoSuchPaddingException e) {
logger.error("NoSuchPaddingException", e);
return null;
} catch (InvalidKeyException e) {
throw new Exception("解密私钥非法,请检查");
} catch (IllegalBlockSizeException e) {
throw new Exception("密文长度非法");
} catch (BadPaddingException e) {
throw new Exception("密文数据已损坏");
}
}
/**
* 公钥解密过程
*
* @param publicKey 公钥
* @param cipherData 密文
* @return 明文
* @throws Exception 运行异常 解密过程中的异常信息
*/
public static byte[] decrypt(RSAPublicKey publicKey, byte[] cipherData) throws Exception {
Optional.ofNullable(publicKey).orElseThrow(() -> new Exception("解密公钥为空, 请设置"));
try {
// 使用默认RSA
Cipher cipher = Cipher.getInstance("RSA");
cipher.init(Cipher.DECRYPT_MODE, publicKey);
byte[] output = cipher.doFinal(cipherData);
return output;
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此解密算法");
} catch (NoSuchPaddingException e) {
throw new Exception("无此附加器异常！");
} catch (InvalidKeyException e) {
throw new Exception("解密公钥非法,请检查");
} catch (IllegalBlockSizeException e) {
throw new Exception("密文长度非法");
} catch (BadPaddingException e) {
throw new Exception("密文数据已损坏");
}
}
/**
* 字节数据转十六进制字符串
*
* @param data 输入数据
* @return 十六进制内容
*/
public static String byteArrayToString(byte[] data) {
StringBuilder stringBuilder = new StringBuilder();
for (int i = 0; i < data.length; i++) {
// 取出字节的高四位 作为索引得到相应的十六进制标识符 注意无符号右移
stringBuilder.append(HEX_CHAR[(data[i] & 0xf0) >>> 4]);
// 取出字节的低四位 作为索引得到相应的十六进制标识符
stringBuilder.append(HEX_CHAR[(data[i] & 0x0f)]);
if (i < data.length - 1) {
stringBuilder.append(' ');
}
}
return stringBuilder.toString();
}
/**
* 从字符串中加载公钥
*
* @param publicKeyStr 公钥数据字符串
* @return 公钥
* @throws Exception 运行异常 加载公钥时产生的异常
*/
public static RSAPublicKey loadPublicKeyByStr(String publicKeyStr) throws Exception {
try {
byte[] buffer = Base64.decodeBase64(publicKeyStr);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
return (RSAPublicKey) 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");
}
}
/**
* 从文件中加载私钥
*
* @param path 私钥文件名
* @return 是否成功
* @throws Exception 运行异常 异常
*/
public static String loadPrivateKeyByFile(String path) throws Exception {
try (BufferedReader bufferedReader = new BufferedReader(new FileReader(path + "/privateKey.keystore"));) {
String readLine;
StringBuilder stringBuilder = new StringBuilder();
while ((readLine = bufferedReader.readLine()) != null) {
stringBuilder.append(readLine);
}
return stringBuilder.toString();
} catch (IOException e) {
throw new Exception("私钥数据读取错误");
} catch (NullPointerException e) {
throw new Exception("私钥输入流为空");
}
}
/**
* 基于字符串获取私钥
*
* @param index 索引字符串
* @return 私钥
* @throws Exception 运行异常 异常
*/
public static RSAPrivateKey loadPrivateKey(String index) throws Exception {
try {
byte[] buffer = Base64.decodeBase64(index);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
return (RSAPrivateKey) 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");
}
}
/**
* 从文件中输入流中加载公钥
*
* @param path 公钥文件路径
* @return 公钥
* @throws Exception 运行异常 加载公钥时产生的异常
*/
public static String loadPublicKey(String path) throws Exception {
try (BufferedReader bufferedReader = new BufferedReader(new FileReader(path + "/publicKey.keystore"));) {
String readLine;
StringBuilder stringBuilder = new StringBuilder();
while ((readLine = bufferedReader.readLine()) != null) {
stringBuilder.append(readLine);
}
return stringBuilder.toString();
} catch (IOException e) {
throw new Exception("公钥数据流读取错误");
} catch (NullPointerException e) {
throw new Exception("公钥输入流为空");
}
}
/**
* 随机生成密钥对,
*
* @param filePath 文件路径
* @throws Exception 运行异常 异常
*/
public static void genKeyPair(String filePath) throws Exception {
if (StringUtils.isAnyEmpty(filePath)) {
filePath = RSAEncrptor.class.getResource("").getFile().substring(1);
}
// KeyPairGenerator类用于生成公钥和私钥对，基于RSA算法生成对象
KeyPairGenerator keyPairGen;
try {
keyPairGen = KeyPairGenerator.getInstance("RSA");
} catch (NoSuchAlgorithmException e) {
logger.error("NoSuchAlgorithmException！\n：", e);
throw e;
}
// 初始化密钥对生成器，密钥大小为96-1024位
keyPairGen.initialize(1024, new SecureRandom());
// 生成一个密钥对，保存在keyPair中
KeyPair keyPair = keyPairGen.generateKeyPair();
// 得到私钥
RSAPrivateKey privateKey = (RSAPrivateKey) keyPair.getPrivate();
// 得到公钥
RSAPublicKey publicKey = (RSAPublicKey) keyPair.getPublic();
try (FileWriter publicFileWriter = new FileWriter(filePath + "publicKey.keystore");
FileWriter privateFileWriter = new FileWriter(filePath + "privateKey.keystore")) {
// 得到公钥字符串
String publicKeyString = Base64.encodeBase64String(publicKey.getEncoded());
// 得到私钥字符串
String privateKeyString = Base64.encodeBase64String(privateKey.getEncoded());
// 将密钥对写入到文件
publicFileWriter.write(publicKeyString);
privateFileWriter.write(privateKeyString);
publicFileWriter.flush();
privateFileWriter.flush();
} catch (Exception e) {
logger.error("GenKeyPair Exception!\n", e);
}
}
}
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