Question

我尝试使用以下代码加密纯文本。代码似乎加密了文本但它没有解密到明文。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。

数组将包含一组字节，这就是我们在logcat中打印出来时所看到的。

要查看实际的String，我们只需要将byte []放入一个新的String（byte []）中 - 这取自我的修改后的官方facebook示例：

 Imports OpenHardwareMonitor
Imports OpenHardwareMonitor.Hardware

Public Class Form1

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Dim cp As New Computer()
        cp.Open()
        cp.HDDEnabled = True
        cp.FanControllerEnabled = True
        cp.RAMEnabled = True
        cp.GPUEnabled = True
        cp.MainboardEnabled = True
        cp.CPUEnabled = True

        Dim Info As String = ""
        For i As Integer = 0 To cp.Hardware.Count() - 1


            If cp.Hardware(i).HardwareType = HardwareType.Mainboard Then
                Info += " Motherboard: " & Trim(cp.Hardware(i).Name) & vbCrLf
            End If
            If cp.Hardware(i).HardwareType = HardwareType.CPU Then
                Info += " Processor: " & Trim(cp.Hardware(i).Name) & vbCrLf
            End If
            If cp.Hardware(i).HardwareType = HardwareType.GpuNvidia Then
                Info += " Video Card: " & Trim(cp.Hardware(i).Name) & vbCrLf
            End If
            If cp.Hardware(i).HardwareType = HardwareType.RAM Then
                Info += " RAM: " & Trim(cp.Hardware(i).Name) & vbCrLf
            End If
            If cp.Hardware(i).HardwareType = HardwareType.HDD Then
                Info += " HDD: " & Trim(cp.Hardware(i).Name) & vbCrLf
            End If
            If cp.Hardware(i).HardwareType = HardwareType.SuperIO Then
                Info += " SuperIO: " & Trim(cp.Hardware(i).Name) & vbCrLf
            End If
        Next
        TextBox1.Text = Info

    End Sub

End Class

结果：

08-02 19：31：11.237 29364-29364 /？ E /加密加密： 0 ＆amp; ？B 6 H ` “ 1 xx 08-0219：31：11.237 29364-29364 /？ E / Crypto Decrypted：密码

Answer 3

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

Answer 4

可能为时已晚，但是我遇到了同样的问题，并在解密后设法获得了纯文本。

您真正需要做的是像下面的代码一样使用nameTextView=findViewById(R.id.nameDashboardTextView) ageTextView=findViewById(R.id.ageDashboardTextView) emailIDTextView=findViewById(R.id.emailIDTextView) genderTextView=findViewById(R.id.genderTextView) weightTextView=findViewById(R.id.weightTextView) heightTextView=findViewById(R.id.heightTextView) progressBar3=findViewById(R.id.progressBar3)：

ByteArrayOutputStream

希望这会有所帮助。

Android使用facebook隐藏库加密plaint文本

4 个答案: