JNCryptor语言 - RNCryptor Image 文件加密/解密

Question

我正在尝试使用 RNCryptor 库的 AES256 实现进行图像加密/解密。

这是我到目前为止的代码：

//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。如果我在某处出错，请告诉我。

以下是我已经尝试过但没有成功的东西：

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
}

保存位图的替代方法：

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()

我能够看到解密的文件，大小与原始文件的大小匹配，尝试调试字节数组转换以确保字节与原始字节相同。

在

图像视图中加载文件时，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来解决。

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
}

私钥是一个长度为 16 的随机字母数字字符串。一旦生成，它 在加密和解密文件时需要重复使用。