Final code to decrypt encrypted file

own.java

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.math.BigInteger;
import java.security.AlgorithmParameters;
import java.security.Key;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.util.ArrayList;
import java.util.Iterator;
import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.PBEKeySpec;
import javax.crypto.spec.SecretKeySpec;

public class own {

  public static String md5(String paramString)
  {
    Object localObject = null;
    try
    {
      MessageDigest localMessageDigest = MessageDigest.getInstance("MD5");
      localObject = localMessageDigest;
    }
    catch (NoSuchAlgorithmException localNoSuchAlgorithmException)
    {
      for (;;)
      {
        localNoSuchAlgorithmException.printStackTrace();
      }
    }
    ((MessageDigest)localObject).update(paramString.getBytes(), 0, paramString.length());
    return new BigInteger(1, ((MessageDigest)localObject).digest()).toString(16);
  }

private void encrypt(String key, String fileName)
    throws Exception
  {
    FileInputStream localFileInputStream = new FileInputStream(fileName);
    FileOutputStream localFileOutputStream = new FileOutputStream(fileName + ".xxx");
    Object localObject1 = new byte[8];
    new SecureRandom().nextBytes((byte[])localObject1);
    Object localObject2 = new FileOutputStream(fileName + ".salt");
    ((FileOutputStream)localObject2).write((byte[])localObject1);
    ((FileOutputStream)localObject2).close();
    localObject1 = new SecretKeySpec(SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1").generateSecret(new PBEKeySpec(key.toCharArray(), (byte[])localObject1, 65536, 256)).getEncoded(), "AES");
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    cipher.init(1, (Key)localObject1);
    localObject2 = cipher.getParameters();
    localObject1 = new FileOutputStream(fileName + ".iv");
    ((FileOutputStream)localObject1).write(((IvParameterSpec)((AlgorithmParameters)localObject2).getParameterSpec(IvParameterSpec.class)).getIV());
    ((FileOutputStream)localObject1).close();
    localObject1 = new byte[64];
    for (;;)
    {
      int i = localFileInputStream.read((byte[])localObject1);
      if (i == -1) {
        break;
      }
      localObject2 = cipher.update((byte[])localObject1, 0, i);
      if (localObject2 != null) {
        localFileOutputStream.write((byte[])localObject2);
      }
    }
    byte[] paramString1 = cipher.doFinal();
    if (paramString1 != null) {
      localFileOutputStream.write(paramString1);
    }
    localFileInputStream.close();
    localFileOutputStream.flush();
    localFileOutputStream.close();
    //DeleteFile(paramString2);
  }


private static void decrypt(String key, String fileName)
    throws Exception
  {
    System.out.println("decrypt");
    //salt
    Object localObject1 = new FileInputStream(fileName.substring(0, fileName.length() - 4) + ".salt");
    Object localObject2 = new byte[8];
    ((FileInputStream)localObject1).read((byte[])localObject2);
    ((FileInputStream)localObject1).close();
    //iv
    Object localObject3 = new FileInputStream(fileName.substring(0, fileName.length() - 4) + ".iv");
    localObject1 = new byte[16];
    ((FileInputStream)localObject3).read((byte[])localObject1);
    ((FileInputStream)localObject3).close();
    //file
    localObject2 = new SecretKeySpec(SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1").generateSecret(new PBEKeySpec(key.toCharArray(), (byte[])localObject2, 65536, 256)).getEncoded(), "AES");
    Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
    cipher.init(2, (Key)localObject2, new IvParameterSpec((byte[])localObject1));
    localObject1 = new FileInputStream(fileName);
    FileOutputStream paramString2 = new FileOutputStream(fileName + ".decrypted");
    localObject3 = new byte[64];
    for (;;)
    {
      int i = ((FileInputStream)localObject1).read((byte[])localObject3);
      if (i == -1) {
        break;
      }
      localObject2 = cipher.update((byte[])localObject3, 0, i);
      if (localObject2 != null) {
        paramString2.write((byte[])localObject2);
      }
    }
    byte[] paramString1 = cipher.doFinal();
    if (paramString1 != null) {
      paramString2.write(paramString1);
    }
    ((FileInputStream)localObject1).close();
    paramString2.flush();
    paramString2.close();
  }
  
  public static String getKey()
  {
    String result = new String();
    for (result = own.md5("867562039629283");; result = own.md5("e21833235b6eef10")) {
      return result;
    }
  }

  public static void main(String[] args) throws Exception
  {
    System.out.println("main");
    own.decrypt(own.getKey(), "IMG_20180101_071505.jpg.xxx");
    System.out.println("done");
  }
}