加密拉链

Question

我想要生成的加密Zip文件，其中包含文件。我想用密码加密它。

我第一次与Encryption合作。我做了我自己的research，我似乎理解但不清楚它是如何工作的。

任何人都可以帮助一个明确的例子，并通过向我解释encrypting的好方法，我该如何实现它，或者举个例子。

我们将不胜感激。

先谢谢

Answer 1

我像这样使用CipherOutputStream：

public static void encryptAndClose(FileInputStream fis, FileOutputStream fos) 
        throws IOException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {

    // Length is 16 byte
    SecretKeySpec sks = new SecretKeySpec("1234567890123456".getBytes(), "AES");
    // Create cipher
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.ENCRYPT_MODE, sks);      

    // Wrap the output stream for encoding
    CipherOutputStream cos = new CipherOutputStream(fos, cipher);       

    //wrap output with buffer stream
    BufferedOutputStream bos = new BufferedOutputStream(cos);     

    //wrap input with buffer stream
    BufferedInputStream bis = new BufferedInputStream(fis); 

    // Write bytes
    int b;
    byte[] d = new byte[8];
    while((b = bis.read(d)) != -1) {
        bos.write(d, 0, b);
    }
    // Flush and close streams.
    bos.flush();
    bos.close();
    bis.close();
}


public static void decryptAndClose(FileInputStream fis, FileOutputStream fos) 
        throws IOException, NoSuchAlgorithmException, NoSuchPaddingException, InvalidKeyException {

    SecretKeySpec sks = new SecretKeySpec("1234567890123456".getBytes(), "AES");
    Cipher cipher = Cipher.getInstance("AES");
    cipher.init(Cipher.DECRYPT_MODE, sks);

    CipherInputStream cis = new CipherInputStream(fis, cipher);

    //wrap input with buffer stream
    BufferedInputStream bis = new BufferedInputStream(cis); 

    //wrap output with buffer stream
    BufferedOutputStream bos = new BufferedOutputStream(fos);       

    int b;
    byte[] d = new byte[8];
    while((b = bis.read(d)) != -1) {
        bos.write(d, 0, b);
    }
    bos.flush();
    bos.close();
    bis.close();
}

我这样用：

File output= new File(outDir, outFilename);

File input= new File(inDir, inFilename);

if (input.exists()) {

FileInputStream inStream = new FileInputStream(input);
FileOutputStream outStream = new FileOutputStream(output);

encryptAndClose(inStream, outStream);   
}