package com.DES;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.Key;
import java.security.SecureRandom;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
import javax.crypto.CipherOutputStream;
import javax.crypto.KeyGenerator;
public class TestDES {
Key key;
public TestDES() {
// TODO Auto-generated constructor stub
}
public TestDES(String str){
getKey(str);// 生成密匙
}
public void getKey(String strKey) {
try {
KeyGenerator _generator = KeyGenerator.getInstance("DES");
_generator.init(new SecureRandom(strKey.getBytes()));
this.key = _generator.generateKey();
_generator = null;
} catch (Exception e) {
throw new RuntimeException(
"Error" + e);
}
}
public void encrypt(String file, String destFile) throws Exception {
Cipher cipher = Cipher.getInstance("DES");
// cipher.init(Cipher.ENCRYPT_MODE, getKey());
cipher.init(Cipher.ENCRYPT_MODE, this.key);
InputStream is = new FileInputStream(file);
OutputStream out = new FileOutputStream(destFile);
CipherInputStream cis = new CipherInputStream(is, cipher);
byte[] buffer = new byte[1024];
int r;
while ((r = cis.read(buffer)) > 0) {
out.write(buffer, 0, r);
}
cis.close();
is.close();
out.close();
}
public void decrypt(String CipherFilePath, String PlainFilePath) throws Exception {
Cipher cipher = Cipher.getInstance("DES");
cipher.init(Cipher.DECRYPT_MODE, this.key);
InputStream is = new FileInputStream(CipherFilePath);
OutputStream out = new FileOutputStream(PlainFilePath);
CipherOutputStream cos = new CipherOutputStream(out, cipher);
byte[] buffer = new byte[1024];
int r;
while ((r = is.read(buffer)) >= 0)
{
cos.write(buffer, 0, r);
}
cos.close();
out.close();
is.close();
}
}
DES-android.zip （24个子文件） 
DES-android bin 
classes.dex 5KB com DES R$layout.class 361B R$id.class 349B R$drawable.class 367B R$attr.class 307B TestDES.class 3KB R.class 454B DES.class 2KB R$string.class 394B resources.ap_ 10KB DES.apk 15KB res drawable-ldpi 
icon.png 2KB drawable-hdpi icon.png 4KB values strings.xml 157B drawable-mdpi icon.png 3KB layout main.xml 393B assets default.properties 362B gen com DES R.java 722B proguard.cfg 1KB src com DES DES.java 964B TestDES.java 2KB .project 839B .classpath 280B AndroidManifest.xml 622B资源评论
