java jar 加密工具 java 加密文件

网上搜的方式大部分都是将加密的密文写入新的文件 解密时再次将解密的铭文写入第三个文件的方式

本人自己实现了一个简单的在一个文件上加密解密的操作 欢迎拍砖~--------------------------------------------------------------------------------

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
/***
* 简单的文件加密解密工具类
* @author gaobiaoqing
*
*/
public class EndeUtil {
static final byte[] KEYVALUE = "6^)(9-p35@%3#4S!4S0)$Y%%^&5(j.&^&o(*0)$Y%!#O@*GpG@=+@j.&6^)(0-=+"
.getBytes();
static final int BUFFERLEN = 1024;
public static void main(String[] args) {
// TODO Auto-generated method stub
try {
String oldFile = new String("D://aaa//2008.pdf");
//encryptFile(oldFile, "123456");
System.out.println("ok");
decryptFile(oldFile,"123456");
System.out.println("good");
} catch (Exception e) {
e.printStackTrace();
}
}
/**
* 加密方法 将文件内容做加密 加密内容覆盖原内容
* @param file
* @param password
*/
public static void encryptFile(String file,String password)throws Exception{
//密码的字节数组 用来异或操作
byte[] PASSVALUE=password.getBytes();
int papos=0;
for(int i=0;i
KEYVALUE[i]^=PASSVALUE[papos];
papos++;
if (papos == PASSVALUE.length)
papos = 0;
}
FileInputStream in = new FileInputStream(file);
ByteArrayOutputStream baos=new ByteArrayOutputStream();
int c, pos, keylen;
pos = 0;
keylen = KEYVALUE.length;
byte[] tempByte = null;
byte buffer[] = new byte[BUFFERLEN];
while ((c = in.read(buffer)) != -1) {
tempByte = new byte[c];
System.arraycopy(buffer, 0, tempByte, 0, c);
for (int i = 0; i < c; i+=10) {
tempByte[i] ^= KEYVALUE[pos];
pos++;
if (pos == keylen)
pos = 0;
}
baos.write(tempByte);
}
//关闭打开的流
in.close();
baos.close();
//缓冲区的有效内容已复制到该数组中
buffer = baos.toByteArray();
FileOutputStream out = new FileOutputStream(file);
// 将位数组内容存回文件
ByteArrayInputStream bais=new ByteArrayInputStream(buffer);
byte [] temp= new byte[BUFFERLEN];
while((c =bais.read(temp))!=-1){
/* for (int i = 0; i < c; i++) {
out.write(temp[i]);
}*/
out.write(temp);
}
//关闭打开的流
bais.close();
out.flush();
out.close();
}
/***
* 解密方法 将加密后的文件内容做解密 解密后的内容覆盖原内容
* @param file
* @param password
* @throws Exception
*/
public static void decryptFile(String file,String password)throws Exception{
//密码的字节数组 用来异或操作
byte[] PASSVALUE=password.getBytes();
int papos=0;
for(int i=0;i
KEYVALUE[i]^=PASSVALUE[papos];
papos++;
if (papos == PASSVALUE.length)
papos = 0;
}
FileInputStream in = new FileInputStream(file);
ByteArrayOutputStream baos=new ByteArrayOutputStream();
int c, pos, keylen;
pos = 0;
keylen = KEYVALUE.length;
byte[] tempByte = null;
byte buffer[] = new byte[BUFFERLEN];
while ((c = in.read(buffer)) != -1) {
tempByte = new byte[c];
System.arraycopy(buffer, 0, tempByte, 0, c);
for (int i = 0; i < c; i+=10) {
tempByte[i] ^= KEYVALUE[pos];
pos++;
if (pos == keylen)
pos = 0;
}
baos.write(tempByte);
}
//关闭打开的流
in.close();
baos.close();
//缓冲区的有效内容已复制到该数组中
buffer = baos.toByteArray();
FileOutputStream out = new FileOutputStream(file);
// 将位数组内容存回文件
ByteArrayInputStream bais=new ByteArrayInputStream(buffer);
byte [] temp= new byte[BUFFERLEN];
while((c =bais.read(temp))!=-1){
/* for (int i = 0; i < c; i++) {
out.write(temp[i]);
}*/
out.write(temp);
}
//关闭打开的流
bais.close();
out.flush();
out.close();
}
}