Decrypted Output Stream Limited to 1024 Size

[Segun Abiodun]

I am trying to decrypt a large file, but when I pass:

pgp.DecryptStream(response_stream, key_stream, password, response_output_stream);

The response_output_stream is always truncated to size 1024.

Please what could be the cause of this? I am using the Trial version of the PGPLibrary for .NET.

Would appreciate any help. Thanks.

[didisoft]

Hi Segun,

I've made a simple command line example that successfully decrypts a 20KB encrypted data using streams.

The example code (C#) is below. You can try it on your side:

----------

using System;

using System.Collections.Generic;

using System.Text;

using System.IO;

using System.Net;

using DidiSoft.Pgp;

namespace EncryptStream1024

{

    class Program

    {

        static void Main(string[] args)

        {

            //

            // You can change these to reflect yours

            //

            string pgpPublicKeyLocation = @"c:\Projects\PGPKeys\public.key";

            string pgpPrivateKeyLocation = @"c:\Projects\PGPKeys\private.key";

            string privateKeypassword = "changeit";

            // download some big text file (20KB in our case)

            var cli = new WebClient();

            string data = cli.DownloadString("https://raw.githubusercontent.com/williamgunn/SciSentiment/master/positive-words.txt");

            // pgp encrypt 

            PGPLib pgp = new PGPLib();

            string encryptedText = pgp.EncryptString(data, pgpPublicKeyLocation);

            //

            // pgp decryption

            //

            MemoryStream outStream = new MemoryStream();

            using (Stream encryptedStream = new MemoryStream(UTF8Encoding.UTF8.GetBytes(encryptedText)))

            using (Stream keyStream = File.OpenRead(pgpPrivateKeyLocation)) 

            {                

                pgp.DecryptStream(encryptedStream, keyStream, privateKeypassword, outStream);

            }

            // do we have more than 1024 bytes ?!?

            Console.WriteLine(outStream.Length);

            Console.WriteLine("Press <ENTER> to exit.");

            Console.ReadLine();

        }

    }

}

-------

Please let me know of the outcome.

Best Regards,

Peter Kalef

DidiSoft Tech support

[Segun Abiodun]

Hello Peter,

Apologies for the so so late response to your post, I got a way around the problem the first time, but when it came back again in another implementation, I had to start searching all over again, until I ran into your response.

I have tested the DecryptStream method independently and it returned a whole lot more the 1024 bytes. Now I am narrowing the problem down to the web service in which I am calling the method. I will keep you posted on my findings.

Thanks again.

Best Regards,
Segun Abiodun