Java文件加密-spring属性文件加密
发布时间：2010/7/1 10:46:44 来源：城市学习网 编辑：ziteng
package com.happy.security.properties;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.security.Key;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.Security;
import javax.crypto.Cipher;
import javax.crypto.KeyGenerator;
public class DESEncryptUtil {
public static Key createKey() throws NoSuchAlgorithmException {//创建密钥
Security.insertProviderAt(new com.sun.crypto.provider.SunJCE(), 1);
KeyGenerator generator = KeyGenerator.getInstance("DES");
generator.init(new SecureRandom());
Key key = generator.generateKey();
return key;
}
public static Key getKey(InputStream is) {
try {
ObjectInputStream ois = new ObjectInputStream(is);
return (Key) ois.readObject();
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
private static byte[] doEncrypt(Key key, byte[] data) {//对数据进行加密?
try {
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key);
byte[] raw = cipher.doFinal(data);
return raw;
} catch (Exception e) {
e.printStackTrace();
throw new RuntimeException(e);
}
}
public static InputStream doDecrypt(Key key, InputStream in) {//对数据进行解密?
try {
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key);
ByteArrayOutputStream bout = new ByteArrayOutputStream();
byte[] tmpbuf = new byte[1024];
int count = 0;
while ((count = in.read(tmpbuf)) != -1) {
bout.write(tmpbuf, 0, count);
tmpbuf = new byte[1024];
}
in.close();
byte[] orgData = bout.toByteArray();
byte[] raw = cipher.doFinal(orgData);
ByteArrayInputStream bin = new ByteArrayInputStream(raw);
return bin; [NextPage] } catch (Exception e){
e.printStackTrace();
throw new RuntimeException(e);
}
}
public static void main(String[] args) throws Exception{
System.out.println("===================");
if (args.length == 2 && args[0].equals("key")){
Key key = DESEncryptUtil.createKey();
ObjectOutputStream oos = new ObjectOutputStream(
new FileOutputStream(args[1]));
oos.writeObject(key);
oos.close();
System.out.println("成功生成密钥文件");
} else if (args.length == 3 && args[0].equals("encrypt")){
File file = new File(args[1]);
FileInputStream in = new FileInputStream(file);
ByteArrayOutputStream bout = new ByteArrayOutputStream();
byte[] tmpbuf = new byte[1024];
int count = 0;
while ((count = in.read(tmpbuf)) != -1){
bout.write(tmpbuf, 0, count);
tmpbuf = new byte[1024];
}
in.close();
byte[] orgData = bout.toByteArray();
Key key = getKey(new FileInputStream(args[2]));
byte[] raw = DESEncryptUtil.doEncrypt(key, orgData);
file = new File(file.getParent() + "\\en_" + file.getName());
FileOutputStream out = new FileOutputStream(file);
out.write(raw);
out.close();
System.out.println("成功加密，加密文件位:"+file.getAbsolutePath());
} else if (args.length == 3 && args[0].equals("decrypt")){//对文件进行解密
File file = new File(args[1]);
FileInputStream fis = new FileInputStream(file);
Key key = getKey(new FileInputStream(args[2]));
InputStream raw = DESEncryptUtil.doDecrypt(key, fis);
ByteArrayOutputStream bout = new ByteArrayOutputStream();
byte[] tmpbuf = new byte[1024];
int count = 0;
while ((count = raw.read(tmpbuf)) != -1){
bout.write(tmpbuf, 0, count);
tmpbuf = new byte[1024];
}
raw.close();
byte[] orgData = bout.toByteArray();
file = new File(file.getParent() + "\\rs_" + file.getName());
FileOutputStream fos = new FileOutputStream(file);
fos.write(orgData);
System.out.println("成功解密，解密文件位:"+file.getAbsolutePath());
}else if(args.length==1 && args[0].equals("-h")) {
System.out.println("\t文件加密解密\n");
System.out.println("创建密钥文件：java -jar key.jar key E:/key.dat");
System.err.println("其中key.jar为需要运行的Jar文件,key参数表示要创建加密文件 E:/key.dat表示加密文件的存放位置");
System.out.println("\n");
System.out.println("加密文件:java -jar key.jar encrypt E:/test.properties E:/key.dat ");
System.err.println("其中key.jar为需要运行的Jar文件 encrypt 参数表示加密 E:/test.properties表示需要加密的文件 E:/key.dat表示加密密钥文件");
System.out.println("\n");
System.out.println("解密文件：java -jar key.jar decrypt E:/en_test.properties E:/key.dat ");
System.err.println("其中key.jar为需要运行的Jar文件 decrypt参数表示解密 E:/en_test.properties表示需要解密的文件 E:/key.dat表示解密的密钥文件");
}else {
System.out.println("你需要运行参数-h");
}
}
}
