Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;

import java.security.spec.KeySpec;

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;
import android.util.Base64;
import android.util.Log;

public class Main {
    public static final String TAG = "IG Password Manager";

    public static String decryptData(String ciphertext, String password) throws Exception {
        int iterationCount = 100; //because polaroid
        int keyLength = 256;

        String[] fields = ciphertext.split("]");
        byte[] iv = Base64.decode(fields[0], 0);
        byte[] salt = Base64.decode(fields[1], 0);
        byte[] cipherBytes = Base64.decode(fields[2], 0);

        Log.d(TAG, "ciphertext: " + ciphertext + "\n" + "iv length is " + "\n" + iv.length);

        KeySpec keySpec = new PBEKeySpec(password.toCharArray(), salt, iterationCount, keyLength);
        SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("PBKDF2WithHmacSHA1");
        byte[] keyBytes = keyFactory.generateSecret(keySpec).getEncoded();
        SecretKey key = new SecretKeySpec(keyBytes, "AES");

        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");
        IvParameterSpec ivParams = new IvParameterSpec(iv);
        cipher.init(Cipher.DECRYPT_MODE, key, ivParams);
        byte[] plaintext = cipher.doFinal(cipherBytes);
        String plainStr = new String(plaintext, "UTF-8");

        return plainStr;
    }
}