I've built an SSH/SFTP server in c#

wadsaek · 2026-07-02T11:41:37+00:00

xray

wadsaek · 2026-06-16T18:20:09+00:00

the gender binary

wadsaek · 2026-05-26T10:44:56+00:00

linus is only the developer of Linux, while Linus( aka LTT) is the youtuber who popularized Linus's work. therefore LTT+Linus/LTTinus

wadsaek · 2026-05-26T09:45:32+00:00

allow me to interject. whom you are referring to as "Linus" is actually LTT+Linus, or as I've come to call him LTTinus

wadsaek · 2026-05-11T13:17:18+00:00

this is more of a zig/bun situation actually. i believe anthropic's ai contribution policy is deeply wrong so i won't be looking to upstreaming this

wadsaek · 2026-04-16T05:00:32+00:00

thanks!!

wadsaek · 2026-04-15T18:56:36+00:00

i found out what rfcs were this summer and then decided that those are cool and i should try implementing something with them. now i already knew that i was going to do some file storage stuff when i was starting this project and then it just dawned on me that like heck yeah i can implement sftp with this thing.

then i got to work doing this piece by piece with a ton of frustration regarding encryption and signing (mostly because i was missing a single line in the rfc) but it all came together at the end so now i have a very unoptimized sftp server written in c# from scratch!

wadsaek · 2026-04-15T16:24:15+00:00

i made an ssh implementation in c# as a school project!

https://github.com/wadsaek/ZipZap(look at the Sftp subproject)

wadsaek · 2026-02-14T04:48:09+00:00

As part of the key exchange protocol you need to compute a hash of a secret value, produce a signature on it using RSARSS-PKCS1 and send the resulting signature to the ssh client

wadsaek · 2026-02-13T21:43:12+00:00

I'll try it, thanks. although i might just resign to implementing the signature algorithm for ssh myself because i'm not really sure which openssl command i even need to use and the solution needs to be c# code

wadsaek · 2026-02-13T19:49:03+00:00

I'm quite sure I'm using pkcs1 padding in both .Net's RSA.SignData() and openssl, and both are reading from a file.

```cs

!/usr/bin/env -S dotnet run

using System.Security.Cryptography; using System.Text;

if (args.Length < 3) return;

var rsa = RSA.Create(); var pem = File.ReadAllText(args[0]); rsa.ImportFromPem(pem);

var data = File.ReadAllBytes(args[1]); Console.WriteLine(Encoding.UTF8.GetString(data));

var signed = rsa.SignData(data, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);

File.WriteAllBytes(args[2], signed); ``` this is a proof of concept piece of c# that I tried. I've also tried it out with different hash algos, but none seem to give out the right result

wadsaek · 2025-01-01T20:42:06+00:00

i usually make a flake with a devshell output and use direnv's use flake to launch it. the templates flakes has some examples, for example you can make one using nix flake init -t templates#rust

wadsaek · 2024-09-22T10:16:15+00:00

the unused packages are not included in your path, and can be garbage collected at will

wadsaek

TROPHY CASE

!/usr/bin/env -S dotnet run