Android使用facebook隐藏库加密纯文本

Question

我尝试使用以下代码加密明文。该代码似乎加密了文本，但它没有解密回明文。我做错了什么？

代码：

Entity entity = new Entity("password");
byte[] ciphertext = crypto.encrypt(("data to encrypt").getBytes(),entity);
plaintext = crypto.decrypt(ciphertext,entity)

输出：

Ecrypted text:[B@417a110
Decrypted text:[B@417df20

Answer 1

以下代码可以加密/解密字符串

KeyChain keyChain = new SharedPrefsBackedKeyChain(context, CryptoConfig.KEY_256);
crypto = AndroidConceal.get().createDefaultCrypto(keyChain);

public static String encrypt(String key, String value) throws KeyChainException, CryptoInitializationException, IOException {
    ByteArrayOutputStream bout = new ByteArrayOutputStream();
    OutputStream cryptoStream = crypto.getCipherOutputStream(bout, Entity.create(key));
    cryptoStream.write(value.getBytes("UTF-8"));
    cryptoStream.close();
    String result = Base64.encodeToString(bout.toByteArray(), Base64.DEFAULT);
    bout.close();
    return result;
}

public static String decrypt(String key, String value) throws KeyChainException, CryptoInitializationException, IOException {
    ByteArrayInputStream bin = new ByteArrayInputStream(Base64.decode(value, Base64.DEFAULT));
    InputStream cryptoStream = crypto.getCipherInputStream(bin, Entity.create(key));
    ByteArrayOutputStream bout = new ByteArrayOutputStream();
    int read = 0;
    byte[] buffer = new byte[1024];
    while ((read = cryptoStream.read(buffer)) != -1) {
        bout.write(buffer, 0, read);
    }
    cryptoStream.close();
    String result = new String(bout.toByteArray(), "UTF-8");
    bin.close();
    bout.close();
    return result;
}

Answer 2

我找到了答案。

原因是我们打印的是字节数组而不是字符串。

数组将由一组字节组成，这就是我们在 logcat 中打印它们时所看到的。

要查看实际的字符串，我们只需要将 byte[] 放入一个新的 String(byte[]) - 这是从官方 facebook 示例和我的修改中获取的：

    Crypto crypto = new Crypto(
            new SharedPrefsBackedKeyChain(getActivity()),
            new SystemNativeCryptoLibrary());

    if (!crypto.isAvailable()) {
        Log.e("Crypto","Crypto is missing");
    }
    String password = "Password";
    Entity entity = new Entity("TEST");
    byte[] encryptedPass = new byte[0];
    byte[] b = password.getBytes(Charset.forName("UTF-8"));
    try {
        encryptedPass = crypto.encrypt(b, entity);
        Log.e("Crypto Encrypted", new String(encryptedPass));
        byte[] decryptedPass = crypto.decrypt(encryptedPass, entity);
        Log.e("Crypto Decrypted ", new String(decryptedPass));
    } catch (KeyChainException e) {
        e.printStackTrace();
    } catch (CryptoInitializationException e) {
        e.printStackTrace();
    } catch (IOException e) {
        e.printStackTrace();
    }

结果：

08-02 19:31:11.237 29364-29364/?电子/加密加密： 0...... E/加密解密：密码

Answer 3

Base64.encodeToString(cipherText, Base64.DEFAULT); then store it.

Answer 4

这可能有点太晚了，但我遇到了同样的问题，并在解密后设法得到了纯文本。

你真正需要做的是使用ByteArrayOutputStream，如下代码：

Entity entity = new Entity("password");
byte[] ciphertext = crypto.encrypt(("data to encrypt").getBytes(),entity);
byte[] plainText = crypto.decrypt(ciphertext,entity);

ByteArrayOutputStream out = new ByteArrayOutputStream();
out.write(plainText, 0, plainText.length);
String decryptedPassword = out.toString();
out.close();

希望这会有所帮助。