加密视频文件？ [英] Encryption of video files?

问题描述

  public static void encryptToBinaryFile（String password，byte [] bytes ，文件文件）throws EncrypterException {
 try {
 final byte [] rawKey = getRawKey（password.getBytes（））; 
 final FileOutputStream ostream = new FileOutputStream（file，false）; 
 
 ostream.write（encrypt（rawKey，bytes））; 
 ostream.flush（）; 
 ostream.close（）; 
 
} catch（IOException e）{
 throw new EncrypterException（e）; 
} 
} 
 
 private static byte [] encrypt（byte [] raw，byte [] clear）throws EncrypterException {
 try {
 final SecretKeySpec skeySpec = new SecretKeySpec（raw，AES）; 
 final Cipher cipher = Cipher.getInstance（AES）; 
 cipher.init（Cipher.ENCRYPT_MODE，skeySpec）; 
 
 return cipher.doFinal（clear）; 
 
} catch（Exception e）{
 throw new EncrypterException（e）; 
} 
} 
  

但它给出错误Outofmemoryerror说拒绝分配301023321元素。

1.我正在使用这种大文件的方法吗？

2.如果是为什么我得到这个错误？什么是解决方案？

3.如果没有，请建议一些好的方法？

解决方案

CipherInputStream 和 CipherOutputStream 将帮助您轻松实现。我写了一个示例程序来加密和解密视频文件。根据您的选择修改它...

  FileInputStream fis = new FileInputStream（new File（D：/ Shashank / inputVideo。 AVI））; 
文件outfile = new File（D：/Shashank/encVideo.avi）; 
 int读; 
 if（！outfile.exists（））
 outfile.createNewFile（）; 
文件解析文件=新文件（D：/Shashank/decVideo.avi）; 
 if（！decfile.exists（））
 decfile.createNewFile（）; 
 FileOutputStream fos = new FileOutputStream（outfile）; 
 FileInputStream encfis = new FileInputStream（outfile）; 
 FileOutputStream decfos = new FileOutputStream（decfile）; 
密码加密= Cipher.getInstance（AES）; 
密码解密= Cipher.getInstance（AES）; 
 KeyGenerator kgen = KeyGenerator.getInstance（AES）; 
 // byte key [] = {0x00,0x32,0x22,0x11,0x00,0x00,0x00,0x00,0x00,0x23,0x00,0x00,0x00,0x00,0x00,0x00,0x00}; 
 SecretKey skey = kgen.generateKey（）; 
 // Lgo 
 encipher.init（Cipher.ENCRYPT_MODE，skey）; 
 CipherInputStream cis = new CipherInputStream（fis，encipher）; 
 decipher.init（Cipher.DECRYPT_MODE，skey）; 
 CipherOutputStream cos = new CipherOutputStream（decfos，decipher）; 
 while（（read = cis.read（））！=  -  1）
 {
 fos.write（（char）read）; 
 fos.flush（）; 
} 
 fos.close（）; 
 while（（read = encfis.read（））！=  -  1）
 {
 cos.write（read）; 
 cos.flush（）; 
} 
 cos.close（）; 
  

我正在使用。您也可以使用字节数组来生成自己的键....

I am using this method for encrypting a video file:

public static void encryptToBinaryFile(String password, byte[] bytes, File file) throws EncrypterException {
    try {
        final byte[] rawKey = getRawKey(password.getBytes());
        final FileOutputStream ostream = new FileOutputStream(file, false);

        ostream.write(encrypt(rawKey, bytes));
        ostream.flush();
        ostream.close();

    } catch (IOException e) {
        throw new EncrypterException(e);
    }
}

private static byte[] encrypt(byte[] raw, byte[] clear) throws EncrypterException {
    try {
       final SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
       final Cipher cipher = Cipher.getInstance("AES");
       cipher.init(Cipher.ENCRYPT_MODE, skeySpec);

       return cipher.doFinal(clear);

    } catch (Exception e) {
        throw new EncrypterException(e);
    }
}

But It gives an error Outofmemoryerror saying rejecting allocation of 301023321 element.

1.Is the method I am using correct for such big files?

2.If yes why I am getting this error?What is solution?

3.If no please suggest some good method for that?

解决方案

CipherInputStream and CipherOutputStream will help you do that easily. I wrote a sample program to encrypt and decrypt a video file. Modify it as per your choice...

FileInputStream fis = new FileInputStream(new File("D:/Shashank/inputVideo.avi"));
        File outfile = new File("D:/Shashank/encVideo.avi");
        int read;
        if(!outfile.exists())
            outfile.createNewFile();
        File decfile = new File("D:/Shashank/decVideo.avi");
        if(!decfile.exists())
            decfile.createNewFile();
        FileOutputStream fos = new FileOutputStream(outfile);
        FileInputStream encfis = new FileInputStream(outfile);
        FileOutputStream decfos = new FileOutputStream(decfile);
        Cipher encipher = Cipher.getInstance("AES");
        Cipher decipher = Cipher.getInstance("AES");
        KeyGenerator kgen = KeyGenerator.getInstance("AES");
        //byte key[] = {0x00,0x32,0x22,0x11,0x00,0x00,0x00,0x00,0x00,0x23,0x00,0x00,0x00,0x00,0x00,0x00,0x00};
        SecretKey skey = kgen.generateKey();
        //Lgo
        encipher.init(Cipher.ENCRYPT_MODE, skey);
        CipherInputStream cis = new CipherInputStream(fis, encipher);
        decipher.init(Cipher.DECRYPT_MODE, skey);
        CipherOutputStream cos = new CipherOutputStream(decfos,decipher);
        while((read = cis.read())!=-1)
                {
                    fos.write((char)read);
                    fos.flush();
                }   
        fos.close();
        while((read=encfis.read())!=-1)
        {
            cos.write(read);
            cos.flush();
        }
    cos.close(); 

I am generating a new key using generateKey(). You can use a byte array too, to generate your own key....

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