package com.yuyh.library.utils.data.safe;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.security.InvalidKeyException;
import java.security.KeyFactory;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;
import java.security.SecureRandom;
import java.security.Signature;
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 javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
/**
* @author yuyh.
* @date 16/4/10.
*/
public class RSAEncrypt {
public static final String KEY_ALGORTHM="RSA";
public static final String SIGNATURE_ALGORITHM="MD5withRSA";
/**
* 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 String privateKey_Str = "";
/**
* 私钥
*/
private RSAPrivateKey privateKey;
/**
* 公钥
*/
private RSAPublicKey publicKey;
public RSAEncrypt(){
}
public RSAEncrypt(String publicKey){
try {
loadPublicKey(publicKey);
} catch (Exception e) {
}
}
/**
* 从文件中输入流中加载公钥
*
* @param in 公钥输入流
*
* @throws Exception 加载公钥时产生的异常
*/
public void loadPublicKey(InputStream in) throws Exception {
try {
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String readLine;
StringBuilder sb = new StringBuilder();
while ((readLine = br.readLine()) != null) {
if (readLine.charAt(0) == '-') {
continue;
} else {
sb.append(readLine);
}
}
in.close();
loadPublicKey(sb.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");
}
}
/**
* 从字符串中加载公钥
*
* @param publicKeyStr 公钥数据字符串
*
* @throws Exception 加载公钥时产生的异常
*/
public void loadPublicKey(String publicKeyStr) throws Exception {
try {
byte[] buffer = Base64.decode(publicKeyStr, Base64.DEFAULT);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
X509EncodedKeySpec keySpec = new X509EncodedKeySpec(buffer);
publicKey = (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");
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 从文件中加载私钥
*
* @param in 私钥文件名
*
* @return 是否成功
*
* @throws Exception
*/
public void loadPrivateKey(InputStream in) throws Exception {
try {
BufferedReader br = new BufferedReader(new InputStreamReader(in));
String readLine;
StringBuilder sb = new StringBuilder();
while ((readLine = br.readLine()) != null) {
if (readLine.charAt(0) == '-') {
continue;
} else {
sb.append(readLine);
}
}
in.close();
loadPrivateKey(sb.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");
}
}
public void loadPrivateKey(String privateKeyStr) throws Exception {
try {
byte[] buffer = Base64.decode(privateKeyStr, Base64.DEFAULT);
PKCS8EncodedKeySpec keySpec = new PKCS8EncodedKeySpec(buffer);
KeyFactory keyFactory = KeyFactory.getInstance("RSA");
privateKey = (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");
}
}
/**
* 数据加密方法
*
* @param sourceData 明文数据
*
* @return 加密后的数据
*/
public String encrypt(byte[] sourceData) {
String result = "";
try {
byte[] cipher = encrypt(publicKey, sourceData);
result = byte2HexStr(cipher);
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
* 解密方法
*
* @param privateKey 私钥
* @param cipherData 加密数据
*
* @return 解密后的明文数据
*/
public String decrypt(String privateKey, byte[] cipherData) {
String result = "";
try {
if (privateKey_Str.equals("")) {
privateKey_Str = privateKey;
loadPrivateKey(privateKey);
}
byte[] cipher = hex2byte(cipherData);
byte[] content = decrypt(this.privateKey, cipher);
result = new String(content);
// result = byte2HexStr(decryKey);
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
* 解密方法
*
* @param cipherData 加密数据
*
* @return 解密后的明文数据
*/
public String decrypt(byte[] cipherData){
String result = "";
try {
byte[] cipher = hex2byte(cipherData);
byte[] content = decrypt(privateKey, cipher);
result = new String(content);
// result = byte2HexStr(decryKey);
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
* 加密过程
*
* @param publicKey 公钥
* @param sourceData 明文数据
*
* @return
*
* @throws Exception 加密过程中的异常信息
*/
private byte[] encrypt(RSAPublicKey publicKey, byte[] sourceData) throws Exception {
if (publicKey == null) {
throw new Exception("加密公钥为空, 请设置");
}
//进行加密
try {
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.ENCRYPT_MODE, publicKey);
return cipher.doFinal(sourceData);
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此加密算法");
} catch (NoSuchPaddingException e) {
e.printStackTrace();
return null;
} 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");
}
}
/**
* 解密过程
*
* @param privateKey 私钥
* @param cipherData 密文数据
*
* @return 明文
*
* @throws Exception 解密过程中的异常信息
*/
private byte[] decrypt(RSAPrivateKey privateKey, byte[] cipherData) throws Exception {
if (privateKey == null) {
throw new Exception("解密私钥为空, 请设置");
}
//进行解密
try {
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.DECRYPT_MODE, privateKey);
return cipher.doFinal(cipherData);
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此解密算法");
} catch (NoSuchPaddingException e) {
e.printStackTrace();
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
*
* @param cipherData 加密数据
*
* @return 解密后的明文数据
*/
public String decryptPublicKey(String cipherData) {
String result = "";
try {
byte[] data = Base64.decode(cipherData, Base64.DEFAULT);
byte[] content = decryptPublicKey(this.publicKey, data);
result = new String(content);
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
public String decryptPublicKey(byte[] data) {
String result = "";
try {
byte[] content = decryptPublicKey(this.publicKey, data);
result = new String(content);
} catch (Exception e) {
e.printStackTrace();
}
return result;
}
/**
* 公钥解密过程
*
* @param publicKey 公钥
* @param sourceData 明文数据
*
* @return
*
* @throws Exception 加密过程中的异常信息
*/
private byte[] decryptPublicKey(RSAPublicKey publicKey, byte[] sourceData) throws Exception {
if (publicKey == null) {
throw new Exception("加密公钥为空, 请设置");
}
try {
Cipher cipher = Cipher.getInstance("RSA/ECB/PKCS1Padding");
cipher.init(Cipher.DECRYPT_MODE, publicKey);
return cipher.doFinal(sourceData);
} catch (NoSuchAlgorithmException e) {
throw new Exception("无此加密算法");
} catch (NoSuchPaddingException e) {
e.printStackTrace();
return null;
} 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");
}
}
/**
* 用私钥对信息生成数字签名
*
* @param data //加密数据
* @param privateKey //私钥
* @return
* @throws Exception
*/
public String sign(byte[] data,String privateKey)throws Exception{
//解密私钥
byte[] keyBytes = Base64.decode(privateKey, Base64.DEFAULT);
//构造PKCS8EncodedKeySpec对象
PKCS8EncodedKeySpec pkcs8EncodedKeySpec = new PKCS8EncodedKeySpec(keyBytes);
//指定加密算法
KeyFactory keyFactory = KeyFactory.getInstance(KEY_ALGORTHM);
//取私钥匙对象
PrivateKey privateKey2 = keyFactory.generatePrivate(pkcs8EncodedKeySpec);
//用私钥对信息生成数字签名
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initSign(privateKey2);
signature.update(data);
byte[] signByte = signature.sign();
return new String(Base64.encode(signByte, Base64.DEFAULT),"UTF-8");
}
/**
* 校验数字签名
* @param data 加密数据
* @param sign 数字签名
*/
public boolean verify(byte[] data,String sign)throws Exception{
//加密后的文件
Signature signature = Signature.getInstance(SIGNATURE_ALGORITHM);
signature.initVerify(publicKey);
signature.update(data);
//验证签名是否正常
return signature.verify(Base64.decode(sign, Base64.DEFAULT));
}
/**
* 十进制字节数据转十六进制字符串
*
* @param data 输入数据十进制
*
* @return 十六进制内容
*/
private String byte2HexStr(byte[] data) {
StringBuilder builder = 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
builder.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
builder.append(HEX_CHAR[(data[i] & 0x0f)]);
}
return builder.toString();
}
/**
* 十六进制字节数组转十进制
* @param hexData 输入十六进制数据
* @return 输出十进制数据
*/
private byte[] hex2byte(byte[] hexData) {
if ((hexData.length % 2) != 0)
throw new IllegalArgumentException("长度不是偶数");
byte[] out = new byte[hexData.length / 2];
for (int n = 0; n < hexData.length; n += 2) {
String item = new String(hexData, n, 2);
out[n / 2] = (byte) Integer.parseInt(item, 16);
}
return out;
}
/**
* 随机生成密钥对
*/
private void genKeyPair() {
KeyPairGenerator keyPairGen = null;
try {
keyPairGen = KeyPairGenerator.getInstance("RSA");
} catch (NoSuchAlgorithmException e) {
e.printStackTrace();
}
keyPairGen.initialize(1024, new SecureRandom());
KeyPair keyPair = keyPairGen.generateKeyPair();
privateKey = (RSAPrivateKey) keyPair.getPrivate();
publicKey = (RSAPublicKey) keyPair.getPublic();
}
}