SprintBoot项目中利用DES文件加密解密
1. maven依赖
<dependency>
<groupId>bcprov</groupId>
<artifactId>bcprov</artifactId>
<version>1.0</version>
</dependency>
2. DES加密解密工具类
package com.eongb0.common.utils;
import org.apache.tomcat.jni.FileInfo;
import org.springframework.mock.web.MockMultipartFile;
import org.springframework.web.multipart.MultipartFile;
import org.springframework.web.multipart.commons.CommonsMultipartFile;
import org2.bouncycastle.util.encoders.Base64;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.DESKeySpec;
import javax.servlet.http.HttpServletResponse;
import java.io.*;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.ArrayList;
public class DesECBUtils {
public static void main(String[] args) {
try {
//String result = new DesECBUtile().decryptFile("870/g8C1Qso=","d:\\313.txt","d:\\313-3.txt");
String key = new DesECBUtils().getKey();
System.out.println(key);
MultipartFile desFile= new MockMultipartFile("12.doc",new FileInputStream(new File("d:\\12.doc")));
new DesECBUtils().encryptDesFile(key,desFile);
new DesECBUtils().decryptFile(key,"123m.doc","d:\\12m--1.doc");
//System.out.println(new DesECBUtile().getKey());
//String result = new DesECBUtile().decryptFile("aGViY2E=","d:\\encrypt-zyq","d:\\encrypt-zyq-1");
//String result = new DesECBUtile().decryptFile("XEMaC5YnGG0=","d:\\322.txt","d:\\322-1.txt");
} catch (Exception e) {
e.printStackTrace();
}
}
public static String getKey() throws NoSuchAlgorithmException {
KeyGenerator keyGenerator = KeyGenerator.getInstance("DES");
keyGenerator.init(56);
SecretKey generateKey = keyGenerator.generateKey();
byte[] encoded = generateKey.getEncoded();
return new String(Base64.encode(encoded));
}
public static String decryptFile(String key, String encryptFile, String srcFile) throws Exception {
byte[] key1 = Base64.decode(key);
//byte[] key1 = key.getBytes();
byte[] buf;
BufferedOutputStream bos = null;
FileOutputStream fos = null;
File file = null;
File dir = new File(srcFile);
if (!dir.exists() && dir.isDirectory()) {
dir.mkdirs();
}
if (dir.exists()) {
dir.delete();
dir.createNewFile();
}
final int readArraySizePerRead = 4096;
file = new File(encryptFile);
ArrayList<Byte> bytes = new ArrayList<Byte>();
if (file.exists()) {
DataInputStream isr = new DataInputStream(new FileInputStream(
file));
byte[] tempchars = new byte[readArraySizePerRead];
int charsReadCount = 0;
fos = new FileOutputStream(dir);
bos = new BufferedOutputStream(fos);
SecureRandom sr = new SecureRandom();
DESKeySpec dks = new DESKeySpec(key1);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey securekey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
//return cipher.doFinal(data);
int tt = 0, i = 0;
byte[] bt;
while ((charsReadCount = isr.read(tempchars)) != -1) {
for (i = 0; i < charsReadCount; i++) {
bytes.add(tempchars[i]);
}
buf = toPrimitives(bytes.toArray(new Byte[0]));
bytes.removeAll(bytes);
bt = cipher.update(buf);
if (bt.length > 0) {
bos.write(bt, tt, bt.length);
}
}
bt = cipher.doFinal(new byte[0]);
bos.write(bt, 0, bt.length);
}
if (bos != null) {
bos.close();
}
if (fos != null) {
fos.close();
}
return "1";
}
public static String decryptFile(String key, String encryptFile) throws Exception {
byte[] key1 = Base64.decode(key);
//byte[] key1 = key.getBytes();
byte[] buf;
StringBuffer bf = new StringBuffer();
File file = null;
final int readArraySizePerRead = 4096;
file = new File(encryptFile);
ArrayList<Byte> bytes = new ArrayList<Byte>();
if (file.exists()) {
DataInputStream isr = new DataInputStream(new FileInputStream(
file));
byte[] tempchars = new byte[readArraySizePerRead];
int charsReadCount = 0;
SecureRandom sr = new SecureRandom();
DESKeySpec dks = new DESKeySpec(key1);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey securekey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
//return cipher.doFinal(data);
int tt = 0, i = 0;
byte[] bt;
while ((charsReadCount = isr.read(tempchars)) != -1) {
for (i = 0; i < charsReadCount; i++) {
bytes.add(tempchars[i]);
}
buf = toPrimitives(bytes.toArray(new Byte[0]));
bytes.removeAll(bytes);
bt = cipher.update(buf);
}
bt = cipher.doFinal(new byte[0]);
bf.append(bt);
}
return bf.toString();
}
public static String encryptFile(String key, String srcFile, String encryptFile) throws Exception {
byte[] key1 = Base64.decode(key);
byte[] buf;
BufferedOutputStream bos = null;
FileOutputStream fos = null;
File file = null;
File dir = new File(encryptFile);
if (!dir.exists() && dir.isDirectory()) {
dir.mkdirs();
}
if (dir.exists()) {
dir.delete();
dir.createNewFile();
}
final int readArraySizePerRead = 4096;
file = new File(srcFile);
ArrayList<Byte> bytes = new ArrayList<Byte>();
if (file.exists()) {
DataInputStream isr = new DataInputStream(new FileInputStream(file));
byte[] tempchars = new byte[readArraySizePerRead];
int charsReadCount = 0;
fos = new FileOutputStream(dir);
bos = new BufferedOutputStream(fos);
SecureRandom sr = new SecureRandom();
DESKeySpec dks = new DESKeySpec(key1);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey securekey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
int tt = 0, i = 0;
byte[] bt;
while ((charsReadCount = isr.read(tempchars)) != -1) {
for (i = 0; i < charsReadCount; i++) {
bytes.add(tempchars[i]);
}
buf = toPrimitives(bytes.toArray(new Byte[0]));
bytes.removeAll(bytes);
bt = cipher.update(buf);
if (bt.length > 0) {
bos.write(bt, tt, bt.length);
}
}
bt = cipher.doFinal(new byte[0]);
bos.write(bt, 0, bt.length);
}
if (bos != null) {
bos.close();
}
if (fos != null) {
fos.close();
}
return "1";
}
static byte[] toPrimitives(Byte[] oBytes) {
byte[] bytes = new byte[oBytes.length];
for (int i = 0; i < oBytes.length; i++) {
bytes[i] = oBytes[i];
}
return bytes;
}
public static File multipartFileToFile(MultipartFile file) throws Exception {
File toFile = null;
if (file.equals("") || file.getSize() <= 0) {
file = null;
} else {
InputStream ins = null;
ins = file.getInputStream();
toFile = new File(file.getOriginalFilename());
inputStreamToFile(ins, toFile);
ins.close();
}
return toFile;
}
//获取流文件
private static void inputStreamToFile(InputStream ins, File file) {
try {
OutputStream os = new FileOutputStream(file);
int bytesRead = 0;
byte[] buffer = new byte[8192];
while ((bytesRead = ins.read(buffer, 0, 8192)) != -1) {
os.write(buffer, 0, bytesRead);
}
os.close();
ins.close();
} catch (Exception e) {
e.printStackTrace();
}
}
public static byte[] encryptbyteFile(String key, MultipartFile file) throws Exception {
byte[] key1 = Base64.decode(key);
byte[] buf;
String encryptFile="d:\\123m.doc";
BufferedOutputStream bos = null;
FileOutputStream fos = null;
final int readArraySizePerRead = 4096;
// File files =multipartFileToFile(file) ;
ArrayList<Byte> bytes = new ArrayList<Byte>();
DataInputStream isr = new DataInputStream(file.getInputStream());
byte[] tempchars = new byte[readArraySizePerRead];
int charsReadCount = 0;
fos = new FileOutputStream("");
bos = new BufferedOutputStream(fos);
SecureRandom sr = new SecureRandom();
DESKeySpec dks = new DESKeySpec(key1);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey securekey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
int tt = 0, i = 0;
byte[] bt;
while ((charsReadCount = isr.read(tempchars)) != -1) {
for (i = 0; i < charsReadCount; i++) {
bytes.add(tempchars[i]);
}
buf = toPrimitives(bytes.toArray(new Byte[0]));
bytes.removeAll(bytes);
bt = cipher.update(buf);
if (bt.length > 0) {
bos.write(bt, tt, bt.length);
}
}
bt = cipher.doFinal(new byte[0]);
InputStream inputStream = new ByteArrayInputStream(bt);
bos.write(bt, 0, bt.length);
if (bos != null) {
bos.close();
}
if (fos != null) {
fos.close();
}
return bt;
}
public static MultipartFile encryptDesFile(String key, MultipartFile file) throws Exception {
byte[] key1 = Base64.decode(key);
byte[] buf;
String encryptFile=GTime.getTime(GTime.YYYYMMDDhhmmssxxx)+file.getOriginalFilename();
BufferedOutputStream bos = null;
FileOutputStream fos = null;
final int readArraySizePerRead = 4096;
// File files =multipartFileToFile(file) ;
ArrayList<Byte> bytes = new ArrayList<Byte>();
DataInputStream isr = new DataInputStream(file.getInputStream());
byte[] tempchars = new byte[readArraySizePerRead];
int charsReadCount = 0;
fos = new FileOutputStream(encryptFile);
bos = new BufferedOutputStream(fos);
SecureRandom sr = new SecureRandom();
DESKeySpec dks = new DESKeySpec(key1);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey securekey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, securekey, sr);
int tt = 0, i = 0;
byte[] bt;
while ((charsReadCount = isr.read(tempchars)) != -1) {
for (i = 0; i < charsReadCount; i++) {
bytes.add(tempchars[i]);
}
buf = toPrimitives(bytes.toArray(new Byte[0]));
bytes.removeAll(bytes);
bt = cipher.update(buf);
if (bt.length > 0) {
bos.write(bt, tt, bt.length);
}
}
bt = cipher.doFinal(new byte[0]);
InputStream inputStream = new ByteArrayInputStream(bt);
bos.write(bt, 0, bt.length);
if (bos != null) {
bos.close();
}
if (fos != null) {
fos.close();
}
File jmhfile=new File(encryptFile);
MultipartFile desFile= new MockMultipartFile(file.getName(),file.getOriginalFilename(),file.getContentType(),new FileInputStream(jmhfile));
jmhfile.delete();
return desFile;
}
public static void decryptFileBybytes(String key, byte[] jmbytes, String filename, HttpServletResponse response)throws Exception {
byte[] key1 = Base64.decode(key);
//byte[] key1 = key.getBytes();
byte[] buf;
BufferedOutputStream bos = null;
FileOutputStream fos = null;
File file = null;
File dir = new File(filename);
final int readArraySizePerRead = 4096;
ArrayList<Byte> bytes = new ArrayList<Byte>();
response.reset();
response.setContentType("application/octet-stream");
response.setHeader("Content-Disposition",
"attachment; filename=" + java.net.URLEncoder.encode(filename, "UTF-8"));
bos = new BufferedOutputStream(response.getOutputStream());
InputStream inputStream = new ByteArrayInputStream(jmbytes);
DataInputStream isr = new DataInputStream(inputStream);
byte[] tempchars = new byte[readArraySizePerRead];
int charsReadCount = 0;
SecureRandom sr = new SecureRandom();
DESKeySpec dks = new DESKeySpec(key1);
SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DES");
SecretKey securekey = keyFactory.generateSecret(dks);
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, securekey, sr);
//return cipher.doFinal(data);
int tt = 0, i = 0;
byte[] bt;
while ((charsReadCount = isr.read(tempchars)) != -1) {
for (i = 0; i < charsReadCount; i++) {
bytes.add(tempchars[i]);
}
buf = toPrimitives(bytes.toArray(new Byte[0]));
bytes.removeAll(bytes);
bt = cipher.update(buf);
if (bt.length > 0) {
bos.write(bt, tt, bt.length);
}
}
bt = cipher.doFinal(new byte[0]);
bos.write(bt, 0, bt.length);
bos.flush();
bos.close();
// return bt;
}
}
3. 文件加密解密接口
/**
* 文件上传
* 根据fileType选择上传方式
*
* @param file
* @return
* @throws Exception
*/
@PostMapping("/files-anon")
public FileInfo upload(@RequestParam("file") MultipartFile file, HttpServletResponse response) throws Exception {
String key = ""; //对称密钥
//生成对接加密的密钥
try {
key = DesECBUtils.getKey();
} catch (NoSuchAlgorithmException e) {
System.out.println("对称加密密钥生成失败：异常信息" + e.getMessage());
}
MultipartFile desFile = DesECBUtils.encryptDesFile(key,file);
return fileService.upload(key,desFile);
}
@ApiOperation("文件解密")
@GetMapping("/files-decrypt")
public void decryptFile(@RequestParam Map<String,Object> params, HttpServletRequest request, HttpServletResponse response) throws Exception {
String fileUrl = MapUtils.getString(params,"fileUrl");
String fileId = MapUtils.getString(params,"fileId");
FileInfo fileInfo = fileService.getById(fileId);
byte[] jmbytes = fileService.download(fileId);
String key = fileInfo.getKey();
DesECBUtils.decryptFileBybytes(key,jmbytes,fileInfo.getName(),response);
}
