非死book的數據加密包：Conceal

Conceal 是 非死book 推出的一個用來對數據進行快速加密和認證的開發包，應用可以使用它來加密數據和大文件存儲。Conceal 和其他加密軟件不同的是它提供了 Smorgasbord 加密算法和選項，這不是一個一般意義上的數據加密包，只是提供一些有用的方法。

示例代碼：

// 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());

FileOutputStream fileStream = 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();

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