1.用jeb反编译程序
package com.example.simpleencryption;
import android.app.Activity;
import android.app.AlertDialog$Builder;
import android.content.Context;
import android.content.DialogInterface;
import android.content.DialogInterface$OnClickListener;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.view.View$OnClickListener;
import java.io.IOException;
import java.io.InputStream;
import java.io.UnsupportedEncodingException;
public class MainActivity extends Activity {
public MainActivity() {
super();
}
static String access$0(String arg1, byte[] arg2) {
return MainActivity.bytesToAliSmsCode(arg1, arg2);
}
static void access$1(MainActivity arg0) {
arg0.showDialog();
}
private static byte[] aliCodeToBytes(String codeTable, String strCmd) {
byte[] v1 = new byte[strCmd.length()];
int v2;
for(v2 = 0; v2 < strCmd.length(); ++v2) {
v1[v2] = ((byte)codeTable.indexOf(strCmd.charAt(v2)));
}
return v1;
}
private static String bytesToAliSmsCode(String table, byte[] data) {
StringBuilder v1 = new StringBuilder();
int v0;
for(v0 = 0; v0 < data.length; ++v0) {
v1.append(table.charAt(data[v0] & 255));
}
return v1.toString();
}
protected String getPwdFromPic() {
String v6;
InputStream v3;
String v5 = "";
try {
v3 = this.getResources().getAssets().open("logo.png");
int v4 = v3.available();
byte[] v0 = new byte[v4];
v3.read(v0, 0, v4);
byte[] v1 = new byte[18];
System.arraycopy(v0, 91265, v1, 0, 18);
v6 = new String(v1, "utf-8");
if(v3 == null) {
return v6;
}
}
catch(Throwable v7) {
label_30:
if(v3 != null) {
try {
v3.close();
}
catch(IOException v8) {
}
}
throw v7;
}
catch(Exception v2) {
try {
v2.printStackTrace();
if(v3 == null) {
return v5;
}
}
catch(Throwable v7) {
goto label_30;
}
try {
v3.close();
}
catch(IOException v7_1) {
}
return v5;
}
try {
v3.close();
v5 = v6;
}
catch(IOException v7_1) {
v5 = v6;
}
return v5;
}
protected String getTableFromPic() {
String v6;
InputStream v3;
String v5 = "";
try {
v3 = this.getResources().getAssets().open("logo.png");
int v4 = v3.available();
byte[] v0 = new byte[v4];
v3.read(v0, 0, v4);
byte[] v1 = new byte[768];
System.arraycopy(v0, 89473, v1, 0, 768);
v6 = new String(v1, "utf-8");
if(v3 == null) {
return v6;
}
}
catch(Throwable v7) {
label_30:
if(v3 != null) {
try {
v3.close();
}
catch(IOException v8) {
}
}
throw v7;
}
catch(Exception v2) {
try {
v2.printStackTrace();
if(v3 == null) {
return v5;
}
}
catch(Throwable v7) {
goto label_30;
}
try {
v3.close();
}
catch(IOException v7_1) {
}
return v5;
}
try {
v3.close();
v5 = v6;
}
catch(IOException v7_1) {
v5 = v6;
}
return v5;
}
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(1);
this.setContentView(2130903064);
this.findViewById(2131034174).setOnClickListener(new View$OnClickListener() {
public void onClick(View v) {
String v3 = this.val$edit.getText().toString();
String v5 = MainActivity.this.getTableFromPic();
String v4 = MainActivity.this.getPwdFromPic();
Log.i("lil", "table:" + v5);
Log.i("lil", "pw:" + v4);
try {
String v2 = MainActivity.bytesToAliSmsCode(v5, v3.getBytes("utf-8"));
Log.i("lil", "enPassword:" + v2);
}
catch(UnsupportedEncodingException v1) {
v1.printStackTrace();
}
if(v4 == null || (v4.equals("")) || !v4.equals(v2)) {
AlertDialog$Builder v0 = new AlertDialog$Builder(MainActivity.this);
v0.setMessage(2131361809);
v0.setTitle(2131361808);
v0.setPositiveButton(2131361811, new DialogInterface$OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
v0.show();
}
else {
MainActivity.this.showDialog();
}
}
});
}
private void showDialog() {
AlertDialog$Builder v0 = new AlertDialog$Builder(((Context)this));
v0.setMessage(2131361810);
v0.setTitle(2131361808);
v0.setPositiveButton(2131361811, new DialogInterface$OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
}
});
v0.show();
}
}
很容易看到原码。
然后阅读源代码知道程序要求出一串下标。
自己写程序读出两张表。
//获取字符串
String strTable="";
InputStream v3;
InputStream v5;
try
{
v3 = this.getResources().getAssets().open("logo.png");
int v4 = v3.available();
byte[] v0 = new byte[v4];
v3.read(v0, 0, v4);
byte[] v1 = new byte[768];
System.arraycopy(v0, 89473, v1, 0, 768);
strTable = new String(v1, "utf-8");
} catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.i("lil", "table:" + strTable);
String strPass="";
try
{
v5 = getResources().getAssets().open("logo.png");
int v4 = v5.available();
byte[] v0 = new byte[v4];
v5.read(v0, 0, v4);
byte[] v1 = new byte[18];
System.arraycopy(v0, 91265, v1, 0, 18);
strPass = new String(v1, "utf-8");
} catch (IOException e)
{
// TODO Auto-generated catch block
e.printStackTrace();
}
Log.i("lil", "pw:" + strPass);
都出来是这样的。：
table:
一乙二十丁厂七卜人入八九几儿了力乃刀又三
于干亏士工土才寸下大丈与万上小口巾山千乞
川亿个勺久凡及夕丸么广亡门义之尸弓己已子
卫也女飞刃习叉马乡丰王井开夫天无元专云扎
艺木五支厅不太犬区历尤友匹车巨牙屯比互切
瓦止少日中冈贝内水见午牛手毛气升长仁什片
仆化仇币仍仅斤爪反介父从今凶分乏公仓月氏
勿欠风丹匀乌凤勾文六方火为斗忆订计户认心
尺引丑巴孔队办以允予劝双书幻玉刊示末未击
打巧正扑扒功扔去甘世古节本术可丙左厉右石
布龙平灭轧东卡北占业旧帅归且旦目叶甲申叮
电号田由史只央兄叼叫另叨叹四生失禾丘付仗
代仙们仪白仔他斥瓜乎丛令用甩印乐
pw:义弓么丸广之
在table中查找pw的位置。
得到下标：053 056 049 048 050 054
上边下标是utf_8编码 转成数字是581026 就是答案。
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