Question

我一直在寻找使用Conceal来加密某些文件。提供的代码段指出输入是纯文本。它可以用于加密文件二进制文件吗？为什么它是专门的纯文本而不是一般二进制文件？

以下是提供的代码段：

// Creates a new Crypto object with default implementations of 
// a key chain as well as native library.
Crypto crypto = new Crypto(
  new SharedPrefsBackedKeyChain(context),
  new SystemNativeCryptoLibrary());

// Check for whether the crypto functionality is available
// This might fail if Android does not load libaries correctly.
if (!crypto.isAvailable()) {
  return;
}

OutputStream fileStream = new BufferedOutputStream(
  new FileOutputStream(file));

// Creates an output stream which encrypts the data as
// it is written to it and writes it out to the file.
OutputStream outputStream = crypto.getCipherOutputStream(
  fileStream,
  entity);

// Write plaintext to it.
outputStream.write(plainText);
outputStream.close();

Answer 1

从图书馆，方法说：

  /**
   * A convenience method to encrypt data if the data to be processed is small and can
   * be held in memory.
   * @param plainTextBytes Bytes of the plain text.
   * @param entity Entity to process.
   * @return cipherText.
   * @throws KeyChainException
   * @throws CryptoInitializationException
   * @throws IOException
   * @throws CryptoInitializationException Thrown if the crypto libraries could not be initialized.
   * @throws KeyChainException Thrown if there is trouble managing keys.
   */
  public byte[] encrypt(byte[] plainTextBytes, Entity entity)
    throws KeyChainException, CryptoInitializationException, IOException {
    int cipheredBytesLength = plainTextBytes.length + mCipherHelper.getCipherMetaDataLength();
    FixedSizeByteArrayOutputStream outputStream = new FixedSizeByteArrayOutputStream(cipheredBytesLength);
    OutputStream cipherStream = mCipherHelper.getCipherOutputStream(outputStream, entity);
    cipherStream.write(plainTextBytes);
    cipherStream.close();
    return outputStream.getBytes();
  }

您需要将纯文本转换为byte []才能使用该库。如果你也可以将二进制文件转换为byte []，那么你可以使用隐藏来实现你的目的。

试试这个方法：

byte[] bytes = File.ReadAllBytes("C:\\Mybinaryfile");

使用隐藏加密文件

1 个答案: