android - JNCryptor - RNCryptor 图像文件加密/解密

Question

我正在尝试使用 RNCryptor 的 AES256 实现来使图像加密/解密工作图书馆。

这是我目前的代码:

//Encrypt file
/**
 *
var encryptedData = RNCryptor.encrypt(data: data as Data, withPassword: hashKey.description)
try encryptedData.write(to: fileURL)
 * */
fun encryptFile( inputFile : File ) : File {

    val size = inputFile.length().toInt()
    val fileBytes = ByteArray(size)
    val aeS256JNCryptor = AES256JNCryptor()
    val file = File(Environment.getExternalStorageDirectory().toString() + "/Encrypted_" + inputFile.name)
    try {
        val buf = BufferedInputStream(FileInputStream(inputFile))
        buf.read(fileBytes, 0, fileBytes.size)

        val encryptedFileBytes = aeS256JNCryptor.encryptData(fileBytes, "master".toCharArray())

        val bufOut = BufferedOutputStream(FileOutputStream(file))
        bufOut.write(encryptedFileBytes)

        buf.close()
        bufOut.close()

    } catch (e: FileNotFoundException) {
        // TODO Auto-generated catch block
        e.printStackTrace()
    } catch (e: IOException) {
        // TODO Auto-generated catch block
        e.printStackTrace()
    }

    return file

}

//Decrypt file
/**
 *
let encryptedData = fileManager.contents(atPath: filePathNormal)
let decryptedData = try RNCryptor.decrypt(data: encryptedData!, withPassword: hashKey.description)
let selected_image = UIImage.sd_image(with: decryptedData)
 * */
fun decryptFile( inputFile : File ) : File {

    val size = inputFile.length().toInt()
    val fileBytes = ByteArray(size)
    val aeS256JNCryptor = AES256JNCryptor()
    val file = File(Environment.getExternalStorageDirectory().toString() + "/Decrypted_" + inputFile.name)
    try {
        val buf = BufferedInputStream(FileInputStream(inputFile))
        buf.read(fileBytes, 0, fileBytes.size)

        val decryptedFileBytes = aeS256JNCryptor.decryptData(fileBytes, "master".toCharArray())

        val bufOut = BufferedOutputStream(file.outputStream())
        bufOut.write(decryptedFileBytes)

        buf.close()
        bufOut.close()

    } catch (e: FileNotFoundException) {
        // TODO Auto-generated catch block
        e.printStackTrace()
    } catch (e: IOException) {
        // TODO Auto-generated catch block
        e.printStackTrace()
    }

    return file
}

解密后我无法加载/查看图像。我已经发布了评论中使用的相关 iOS 代码。如果我在某个地方出错了，请告诉我。

以下是我已经尝试过但没有成功的方法:

fun decryptFile( inputFile : File ) : File {

    val size = inputFile.length().toInt()
    val fileBytes = ByteArray(size)
    val aeS256JNCryptor = AES256JNCryptor()
    val file = File(Environment.getExternalStorageDirectory().toString() + "/Decrypted_" + inputFile.name)
    try {
        val buf = BufferedInputStream(FileInputStream(inputFile))
        buf.read(fileBytes, 0, fileBytes.size)

        val decryptedFileBytes = aeS256JNCryptor.decryptData(fileBytes, "master".toCharArray())

        if( file.exists() ) file.delete()

        //val bufOut = BufferedOutputStream(file.outputStream())
        //bufOut.write(decryptedFileBytes)

        val fileOutputStream = FileOutputStream( file.absolutePath )
        fileOutputStream.write(decryptedFileBytes)
        buf.close()
        fileOutputStream.close()
        //bufOut.close()

    } catch (e: FileNotFoundException) {
        // TODO Auto-generated catch block
        e.printStackTrace()
    } catch (e: IOException) {
        // TODO Auto-generated catch block
        e.printStackTrace()
    }

    return file
}

另一种保存位图的方法:

val fileOutputStream = FileOutputStream( file.absolutePath )
        //fileOutputStream.write(decryptedFileBytes)

val bitmap = BitmapFactory.decodeByteArray(decryptedFileBytes, 0, decryptedFileBytes.size)
if( bitmap != null )
   bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fileOutputStream)


buf.close()
fileOutputStream.close()

我可以看到解密后的文件，大小和原文件一致，尝试调试字节数组转换，确保字节与原文件一致。

在 ImageView 中加载文件时，我无法在图库/应用程序中打开文件。

Answer 1

通过更改密码的加密和使用方式解决了。

这是有效的:

//Encrypt file
/**
 *
var encryptedData = RNCryptor.encrypt(data: data as Data, withPassword: hashKey.description)
try encryptedData.write(to: fileURL)
 fileBytes - 3,1,-54,106
 encrypted - 3,1,71,68
 * */
fun encryptFile( inputFile : File, privateKey : CharArray ) : File {

    val size = inputFile.length().toInt()
    val fileBytes = ByteArray(size)
    val aeS256JNCryptor = AES256JNCryptor()
    val file = File(Environment.getExternalStorageDirectory().toString() + "/Encrypted_" + inputFile.name)
    try {
        val buf = BufferedInputStream(FileInputStream(inputFile))
        buf.read(fileBytes, 0, fileBytes.size)

        val encryptedFileBytes = aeS256JNCryptor.encryptData(fileBytes, privateKey)

        val bufOut = BufferedOutputStream(FileOutputStream(file))
        bufOut.write(encryptedFileBytes)

        buf.close()
        bufOut.close()

    } catch (e: FileNotFoundException) {
        // TODO Auto-generated catch block
        e.printStackTrace()
    } catch (e: IOException) {
        // TODO Auto-generated catch block
        e.printStackTrace()
    }

    return file

}

//Decrypt file
/**
 *
let encryptedData = fileManager.contents(atPath: filePathNormal)
let decryptedData = try RNCryptor.decrypt(data: encryptedData!, withPassword: hashKey.description)
let selected_image = UIImage.sd_image(with: decryptedData)
encrypted - 3,1,71,68
decrypted Bytes - 3,1,-54,106
 * */
fun decryptFile( inputFile : File, privateKey: CharArray ) : File {

    val size = inputFile.length().toInt()
    val fileBytes = ByteArray(size)
    val aeS256JNCryptor = AES256JNCryptor()
    val file = File(Environment.getExternalStorageDirectory().toString() + "/Decrypted_" + inputFile.name)
    try {
        val buf = BufferedInputStream(FileInputStream(inputFile))
        buf.read(fileBytes, 0, fileBytes.size)

        val decryptedFileBytes = aeS256JNCryptor.decryptData(fileBytes, privateKey)

        if( file.exists() ) file.delete()

        val fileOutputStream = FileOutputStream( file.absolutePath )
        fileOutputStream.write(decryptedFileBytes)

        buf.close()
        fileOutputStream.close()

    } catch (e: FileNotFoundException) {
        // TODO Auto-generated catch block
        e.printStackTrace()
    } catch (e: IOException) {
        // TODO Auto-generated catch block
        e.printStackTrace()
    }

    return file
}

privateKey is a random alphanumeric string of length 16. Once generated, it needs to be reused while encrypting and decrypting file.