B4J Question AsyncStreams & encryption

[wl]

Hi,

I'm trying to use the encryption library as found at: https://www.b4x.com/android/forum/threads/alice-aes-encryption.108364/#content which allows me to read from an inputstream and writed an encrypted outputstream.

I'm using asyncstreams (from the B4JFTPServer) to read a provided upload of a potential large file, as in:

Private Sub AStream_NewData (buffer() As Byte)
    Try
        FileOut.WriteBytes(buffer, 0, buffer.Length)
    Catch
        Log(LastException)
        Close
    End Try
End Sub

How would I be able to encrypt the provided buffer() which is provided block by block, without taking the entire uploaded file into memory or without saving the file unencrypted and then in a second phase to encrypt the entire file.

Would I be able to pass the provided array of bytes block by block and feed it into the encryption stream ?

Thanks

 

[Erel]

Most probably no. It will be much simpler to save the complete file and then decrypt it.

I've posted code that encrypts or decrypts very large files here: https://www.b4x.com/android/forum/t...encryption-and-decryption.114141/#post-713166
With non-trivial code, you can make it work with AsyncStreams + B4XBytesBuilder.