Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
//License from project: Apache License 

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.security.Key;

import javax.crypto.Cipher;
import javax.crypto.CipherInputStream;

import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class Main {
    private static final String KEY_ALGORITHM = "AES";
    private static final String AES_CFB_NOPADDING = "AES/CFB/NOPADDING";

    public static boolean decryptFile(byte[] key, byte[] iv, String sourceFilePath, String destFilePath) {
        return handleFile(Cipher.DECRYPT_MODE, key, iv, sourceFilePath, destFilePath);
    }

    private static boolean handleFile(int mode, byte[] key, byte[] iv, String sourceFilePath, String destFilePath) {

        File sourceFile = new File(sourceFilePath);
        File destFile = new File(destFilePath);

        try {
            if (sourceFile.exists() && sourceFile.isFile()) {
                if (!destFile.getParentFile().exists())
                    destFile.getParentFile().mkdirs();
                destFile.createNewFile();

                InputStream in = new FileInputStream(sourceFile);
                OutputStream out = new FileOutputStream(destFile);
                Cipher cipher = initCipher(mode, key, iv, AES_CFB_NOPADDING);
                CipherInputStream cin = new CipherInputStream(in, cipher);

                byte[] b = new byte[1024];
                int read = 0;
                while ((read = cin.read(b)) != -1) {
                    out.write(b, 0, read);
                    out.flush();
                }

                cin.close();
                in.close();
                out.close();

                return true;
            }
        } catch (Exception e) {
            e.printStackTrace();
        }

        return false;
    }

    private static Cipher initCipher(int mode, byte[] key, byte[] iv, String cipherAlgotirhm) {
        try {
            Key k = toKey(key);
            Cipher cipher = Cipher.getInstance(cipherAlgotirhm);
            String CipherAlgotirhm = cipherAlgotirhm.toUpperCase();
            if (CipherAlgotirhm.contains("CFB") || CipherAlgotirhm.contains("CBC"))
                cipher.init(mode, k, new IvParameterSpec(iv));
            else
                cipher.init(mode, k);
            return cipher;
        } catch (Exception e) {
            e.printStackTrace();
        }
        return null;

    }

    private static Key toKey(byte[] key) {
        return new SecretKeySpec(key, KEY_ALGORITHM);
    }
}