I am trying to get image encryption / decryption using AES256 to implement RNCryptor .
This is my code:
//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
}
After decryption, I can not upload / view the image. I posted the appropriate iOS code used in the comments. Please let me know if I am mistaken somewhere.
Here is what I have tried without success:
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 fileOutputStream = FileOutputStream( file.absolutePath )
fileOutputStream.write(decryptedFileBytes)
buf.close()
fileOutputStream.close()
} catch (e: FileNotFoundException) {
e.printStackTrace()
} catch (e: IOException) {
e.printStackTrace()
}
return file
}
Alternative way to save a bitmap:
val fileOutputStream = FileOutputStream( file.absolutePath )
val bitmap = BitmapFactory.decodeByteArray(decryptedFileBytes, 0, decryptedFileBytes.size)
if( bitmap != null )
bitmap.compress(Bitmap.CompressFormat.JPEG, 100, fileOutputStream)
buf.close()
fileOutputStream.close()
I can see the decrypted file, the size of which matches the size of the source file, and tried to debug the conversion of the byte array to ensure that the bytes match the original.
I can’t open the file in the Gallery / application while loading it into the image.