由于经常用一些加密或者解密文件的，所以写了一个简单的采用Cipher DES针对文件加密、解密的工具类，记录一下，防止以后忘记了！
import java.io.BufferedReader;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.security.Key;
import java.util.ArrayList;
import java.util.List;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.spec.SecretKeySpec;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/***
* Des文件加密解密
*/
public class FileDeEncrypt {
private static final Logger LOG = LoggerFactory.getLogger(FileDeEncrypt.class);
public FileDeEncrypt(String keyStr) {
genKey(keyStr);
initCipher();
}
private Key key;
// 解密密码
private Cipher cipherDecrypt;
// 加密密码
private Cipher cipherEncrypt;
/**
* 加密文件的核心
*
* @param file
* 要加密的文件
* @param destFile
* 加密后存放的文件名
*/
public boolean encryptFile(String srcFileName, String destFileName) {
try {
InputStream is = new FileInputStream(srcFileName);
OutputStream out = new FileOutputStream(destFileName);
CipherInputStream cis = new CipherInputStream(is, cipherEncrypt);
byte[] buffer = new byte[1024];
int r;
while ((r = cis.read(buffer)) > 0) {
out.write(buffer, 0, r);
}
cis.close();
is.close();
out.close();
LOG.info("文件{}加密完成，加密后的文件是:{}", srcFileName, destFileName);
return true;
}
catch (Exception e) {
LOG.error("加密文件{}出现异常", srcFileName, e.getMessage());
e.printStackTrace();
return false;
}
}
/***
* 解密文件
*
* @param destFile
*/
public List<String> decryptFileContent(String fileName) {
List<String> list = new ArrayList<String>();
try {
InputStream is = new FileInputStream(fileName);
CipherInputStream cis = new CipherInputStream(is, cipherDecrypt);
BufferedReader reader = new BufferedReader(new InputStreamReader(cis));
String line = null;
while ((line = reader.readLine()) != null) {
list.add(line);
}
reader.close();
cis.close();
is.close();
LOG.info("文件{}解密完成", fileName);
}
catch (Exception e) {
LOG.error("解密文件{}出现异常", fileName, e.getMessage());
e.printStackTrace();
}
return list;
}
/**
* 解密文件，返回reader
* @param fileName
* @return
*/
public BufferedReader decryptFile(String fileName) {
BufferedReader reader = null;
try {
InputStream is = new FileInputStream(fileName);
CipherInputStream cis = new CipherInputStream(is, cipherDecrypt);
reader = new BufferedReader(new InputStreamReader(cis));
}
catch (Exception e) {
LOG.error("解密文件{}出现异常", fileName, e.getMessage());
e.printStackTrace();
}
return reader;
}
private void initCipher() {
try {
// 加密的cipher
cipherEncrypt = Cipher.getInstance("DES");
cipherEncrypt.init(Cipher.ENCRYPT_MODE, key);
// 解密的cipher
cipherDecrypt = Cipher.getInstance("DES");
cipherDecrypt.init(Cipher.DECRYPT_MODE, key);
}
catch (Exception e) {
LOG.info("加密初始化出现异常:{}", e.getMessage());
e.printStackTrace();
}
}
/**
* 自定义一个key
*
* @param string
*/
public void genKey(String keyRule) {
// Key key = null;
byte[] keyByte = keyRule.getBytes();
// 创建一个空的八位数组,默认情况下为0
byte[] byteTemp = new byte[8];
// 将用户指定的规则转换成八位数组
for (int i = 0; i < byteTemp.length && i < keyByte.length; i++) {
byteTemp[i] = keyByte[i];
}
key = new SecretKeySpec(byteTemp, "DES");
}
/***
* 测试加密解密
*
* @param args
*/
public static void main(String[] args) {
FileDeEncrypt deEncrypt = new FileDeEncrypt("STP FILE DE-ENCRYPT");
deEncrypt.encryptFile("pom.xml", "pom.bin");
List<String> list = deEncrypt.decryptFileContent("pom.bin");
for (String str : list) {
System.out.println(str);
}
}
}---------------------------------------------------------------------
作者：cloud-coder
来源：开源中国
链接：https://my.oschina.net/cloudcoder/blog/648682
下面是我个人写的流加密工具
package com.brillilab.common.utils;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.NoSuchPaddingException;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;
import java.io.*;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
/**
* 流加解密工具
*
* @author wmh
*/
public class FileSecurityUtil {
/**
* 加密输入流
*
* @param in
* @param secretKey
* @return
*/
public static InputStream encryptIputStream(InputStream in,String secretKey) {
String tempKey=genTempKeyString(secretKey);
Cipher cipher=initCipher(Cipher.ENCRYPT_MODE,tempKey);
return new CipherInputStream(in,cipher);
}
/**
* 解密输出流
*
* @param out
* @param secretKey
* @return
*/
public static OutputStream decryptOutputStream(OutputStream out,String secretKey) {
String tempKey=genTempKeyString(secretKey);
Cipher cipher=initCipher(Cipher.DECRYPT_MODE,tempKey);
return new CipherOutputStream(out,cipher);
}
/**
* 加密器
*
* @param cipherModel
* @param keyRule
* @return
*/
private static Cipher initCipher(int cipherModel,String keyRule) {
try {
byte[] keyBytes=keyRule.substring(0,8).getBytes("ASCII");
byte[] IVBytes=keyRule.substring(8,16).getBytes("ASCII");
SecretKeySpec key=new SecretKeySpec(keyBytes,"DES");
IvParameterSpec IV=new IvParameterSpec(IVBytes);
Cipher cipher=Cipher.getInstance("DES/CBC/NoPadding");
cipher.init(cipherModel,key,IV);
return cipher;
} catch (NoSuchAlgorithmException | UnsupportedEncodingException | InvalidKeyException |
InvalidAlgorithmParameterException | NoSuchPaddingException e) {
e.printStackTrace();
return null;
}
}
/**
* 获取临时key
* @param keyStr
* @return
*/
private static String genTempKeyString(String keyStr) {
Assert.isTrue(!StringUtils.isEmpty(keyStr) && keyStr.length() == 16,"keyStr must be formed with 16 characters");
String tempKey=null;
tempKey=keyStr.substring(14,16) + keyStr.substring(0,2) + keyStr.substring(10,12) + keyStr.substring(8,10);
tempKey+=keyStr.substring(12,14) + keyStr.substring(6,8) + keyStr.substring(2,4) + keyStr.substring(4,6);
return tempKey;
}
}
可以直接拿去使用，有感兴趣的小伙伴也可以自己写一下，只是简单的 javax.crypto.Cipher , java.security 包API的使用