# 2
The Encrypter Class
// Decompiled by DJ v3.2.2.67 Copyright 2002 Atanas Neshkov Date: 2/7/2007 5:53:46 PM
// Home Page : http://members.fortunecity.com/neshkov/dj.html - Check often for new version!
// Decompiler options: packimports(3)
// Source File Name:Encrypter.java
package com.aurionpro.crypto;
import java.io.*;
import java.util.Vector;
import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;
// Referenced classes of package com.aurionpro.crypto:
//Crypter, AppConfiguration
public class Encrypter extends Crypter
{
public Encrypter()
throws Exception
{
}
public void encryptFile(String s)
{
long l = System.currentTimeMillis();
System.out.println("Started at " + l + " milliseconds");
Object obj = null;
Object obj1 = null;
Object obj2 = null;
Object obj3 = null;
Object obj4 = null;
AppConfiguration appconfiguration = AppConfiguration.getAppConfiguration();
String s1 = "";
try
{
File file = new File(s);
String s2 = appconfiguration.getDetail("baseDir") + System.getProperty("file.separator") + appconfiguration.getDetail("sendDir") + System.getProperty("file.separator") + file.getName() + ".enc";
System.out.println(s2);
if(!file.exists())
{
System.out.println("Input File : " + s + " Not Found");
System.exit(1);
}
String s3 = s.substring(s.indexOf(".") + 1, s.length());
generateKey();
Vector vector = new Vector();
super.cipher.init(1, super.secretKey);
super.fileInputStream = new FileInputStream(s);
byte abyte0[] = new byte[super.fileInputStream.available() + 20];
super.cipherInputStream = new CipherInputStream(super.fileInputStream, super.cipher);
File file1 = new File(s2);
if(file1.exists())
{
System.out.println("Encrypted File : " + s2 + " Already Exists!!!");
System.exit(1);
}
super.fileOutputStream = new FileOutputStream(file1);
super.objectOutputStream = new ObjectOutputStream(super.fileOutputStream);
super.fileOutputStream = new FileOutputStream("temp.txt");
long l1;
while((l1 = super.cipherInputStream.read()) >= 0L)
super.fileOutputStream.write((char)(int)l1);
super.fileOutputStream.close();
super.fileInputStream = new FileInputStream("temp.txt");
abyte0 = new byte[super.fileInputStream.available()];
super.fileInputStream.read(abyte0);
vector.addElement(super.secretKey);
vector.addElement(s3);
vector.addElement(abyte0);
super.objectOutputStream.writeObject(vector);
super.objectOutputStream.close();
file1.setReadOnly();
super.fileInputStream.close();
super.cipherInputStream.close();
String s4 = appconfiguration.getDetail("deleteEncFile");
if(s4 != null && s4.trim().equals("Y"))
file.delete();
System.out.println("time taken : " + (System.currentTimeMillis() - l) / 1000 + " seconds");
}
catch(Exception exception)
{
System.out.println("Error while encrypting Code");
exception.printStackTrace();
}
}
public static void main(String args[])
throws Exception
{
Encrypter encrypter = new Encrypter();
if(args.length < 1)
{
System.out.println("Usage:java com.aurionpro.crypto.Encrypter sourceFile");
System.exit(0);
} else
{
encrypter.encryptFile(args[0]);
}
}
}
The crypter class
// Decompiled by DJ v3.2.2.67 Copyright 2002 Atanas Neshkov Date: 2/7/2007 5:53:37 PM
// Home Page : http://members.fortunecity.com/neshkov/dj.html - Check often for new version!
// Decompiler options: packimports(3)
// Source File Name:Crypter.java
package com.aurionpro.crypto;
import com.sun.crypto.provider.SunJCE;
import java.io.*;
import java.security.Security;
import javax.crypto.*;
public class Crypter
{
public Crypter()
throws Exception
{
secretKey = null;
cipher = null;
objectOutputStream = null;
fileOutputStream = null;
cipherInputStream = null;
objectInputStream = null;
fileInputStream = null;
byteArrayInputStream = null;
Security.addProvider(new SunJCE());
cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
}
public void generateKey()
throws Exception
{
KeyGenerator keygenerator = KeyGenerator.getInstance("DES");
secretKey = keygenerator.generateKey();
}
protected SecretKey secretKey;
protected Cipher cipher;
protected final int ENC_MODE = 1;
protected final int DEC_MODE = 2;
protected ObjectOutputStream objectOutputStream;
protected FileOutputStream fileOutputStream;
protected CipherInputStream cipherInputStream;
protected ObjectInputStream objectInputStream;
protected FileInputStream fileInputStream;
protected ByteArrayInputStream byteArrayInputStream;
}
# 4
The decrypter class
// Decompiled by Jad v1.5.8f. Copyright 2001 Pavel Kouznetsov.
// Jad home page: http://www.kpdus.com/jad.html
// Decompiler options: packimports(3)
// Source File Name:Decrypter.java
package icici.matrix.utils;
import java.io.FileInputStream;
import java.io.PrintStream;
import java.math.BigInteger;
import java.util.Properties;
public class Decrypter
{
static class Params
{
BigInteger p;
BigInteger q;
BigInteger n;
BigInteger d;
BigInteger e;
BigInteger phi;
BigInteger max;
Params()
{
p = new BigInteger("0");
q = new BigInteger("0");
n = new BigInteger("0");
d = new BigInteger("0");
e = new BigInteger("15");
phi = new BigInteger("0");
}
}
public Decrypter()
{
}
public String decrypt()
{
Params par = new Params();
String password = "";
String propFile = "app.properties";
try
{
Properties prop = new Properties();
FileInputStream finput = new FileInputStream(propFile);
prop.load(finput);
password = (String)prop.get("password");
System.out.println(password);
}
catch(Exception e)
{
e.printStackTrace();
}
String cipherText = password;
String cipherTextTemp = "";
String decipheredText = "";
String outputText = "";
boolean flag = cipherText.startsWith("P");
if(flag)
cipherText = cipherText.substring(1, cipherText.length());
int blockSize = 4;
if(blockSize % 2 != 0)
{
System.out.println("blockSize must be even");
System.exit(1);
}
String maxEncodedString = "";
for(int cnt = 0; cnt < blockSize; cnt += 2)
maxEncodedString = maxEncodedString + "94";
par.max = new BigInteger(maxEncodedString);
par.p = par.max.divide(new BigInteger("502"));
Decrypter obj = new Decrypter();
obj.getKeys(par, blockSize);
decipheredText = obj.doRSA(cipherText, par.d, par.n, blockSize);
System.out.println("decipheredText\n" + decipheredText);
outputText = obj.decode(decipheredText);
if(flag)
outputText = outputText.substring(0, outputText.length() - 1);
System.out.println("outputText\n" + outputText);
return outputText;
}
void getKeys(Params par, int blockSize)
{
BigInteger bigOne = new BigInteger("1");
for(; !par.p.isProbablePrime(1000); par.p = par.p.add(bigOne));
String firstQ = par.p.subtract(bigOne);
par.q = new BigInteger(firstQ);
for(par.n = par.p.multiply(par.q); par.n.toString().length() > blockSize; par.n = par.p.multiply(par.q))
par.q = par.q.divide(new BigInteger("2"));
for(par.q = par.q.divide(new BigInteger("2")); !par.q.isProbablePrime(1000); par.q = par.q.subtract(bigOne));
for(par.n = par.p.multiply(par.q); par.n.compareTo(par.max) <= 0; par.n = par.p.multiply(par.q))
for(par.q = par.q.add(bigOne); !par.q.isProbablePrime(1000); par.q = par.q.add(bigOne));
if(par.n.toString().length() > blockSize || par.n.compareTo(par.max) <= 0)
{
System.out.println("Required conditions are not met");
System.exit(1);
}
BigInteger pPrime = par.p.subtract(bigOne);
BigInteger qPrime = par.q.subtract(bigOne);
for(par.phi = pPrime.multiply(qPrime); !par.e.gcd(par.phi).equals(bigOne); par.e = par.e.add(bigOne));
par.d = par.e.modInverse(par.phi);
if(blockSize > 6)
System.exit(0);
}
String decode(String encodedText)
{
String temp = "";
String decodedText = "";
for(int cnt = 0; cnt < encodedText.length(); cnt += 2)
{
temp = encodedText.substring(cnt, cnt + 2);
int val = Integer.parseInt(temp) + 32;
decodedText = decodedText + String.valueOf((char)val);
}
return decodedText;
}
String doRSA(String inputString, BigInteger exp, BigInteger n, int blockSize)
{
String temp = "";
String outputString = "";
for(int cnt = 0; cnt < inputString.length(); cnt += blockSize)
{
temp = inputString.substring(cnt, cnt + blockSize);
BigInteger block = new BigInteger(temp);
BigInteger output = block.modPow(exp, n);
for(temp = output.toString(); temp.length() < blockSize; temp = "0" + temp);
outputString = outputString + temp;
}
return outputString;
}
public String decrypt(String password)
{
Params par = new Params();
String cipherText = password;
String cipherTextTemp = "";
String decipheredText = "";
String outputText = "";
boolean flag = cipherText.startsWith("P");
if(flag)
cipherText = cipherText.substring(1, cipherText.length());
int blockSize = 4;
if(blockSize % 2 != 0)
{
System.out.println("blockSize must be even");
System.exit(1);
}
String maxEncodedString = "";
for(int cnt = 0; cnt < blockSize; cnt += 2)
maxEncodedString = maxEncodedString + "94";
par.max = new BigInteger(maxEncodedString);
par.p = par.max.divide(new BigInteger("502"));
Decrypter obj = new Decrypter();
obj.getKeys(par, blockSize);
decipheredText = obj.doRSA(cipherText, par.d, par.n, blockSize);
System.out.println("decipheredText\n" + decipheredText);
outputText = obj.decode(decipheredText);
if(flag)
outputText = outputText.substring(0, outputText.length() - 1);
System.out.println("outputText\n" + outputText);
return outputText;
}
}
