1. Building

    1.1 Open Windows PowerShell.
    1.2 Create a workspace folder:

    > mkdir workspace

    1.3 Set the WORKSPACE environment variable:

    > $Env:WORKSPACE = 'C:\Users\pedro\workspace\'

    1.4 Set the VS140COMNTOOLS environment variable:

    > $Env:VS140COMNTOOLS = 'C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\Tools\'

    1.5 Clone martelletto/openssh-portable's fido2 branch:

    > git clone --branch fido2 https://github.com/martelletto/openssh-portable

    1.6 Build OpenSSH for Windows:

    > .\openssh-portable\contrib\win32\openssh\OpenSSH-build.ps1

2. Pointing PowerShell to the ssh built in the previous step

    2.1 Prepend PATH:

    > $Env:PATH = "C:\Users\pedro\openssh-portable\OpenSSH-Win64_symbols\;" + $Env:PATH

    2.2 Check ssh's version string:

    > ssh -V
    OpenSSH_for_Windows_8.6p1, LibreSSL 3.3.3

3. Testing key generation

    3.1 Create a ecdsa-sk credential on a security key:

    > ssh-keygen -t ecdsa-sk

    3.2 Configure the ssh public key (C:\Users\pedro\.ssh\id_ecdsa_sk.pub) in GitHub. 

4. Testing standalone ssh in PowerShell

    > ssh git@github.com
    <type enter to force ssh to request a shell>
    Hi martelletto! You've successfully authenticated, but GitHub does not provide shell access.

5. Testing git + ssh in PowerShell

    5.1 Set the GIT_SSH environment variable:

    > $Env:GIT_SSH = 'C:\Users\pedro\openssh-portable\OpenSSH-Win64_symbols\ssh.exe'

    5.2 Clone a repository (can be public) over ssh:

    > git clone ssh://git@github.com/yubico/libfido2

6. Pointing WSL2 to the ssh built in step 1.6

    6.1 Prepend PATH:

    $ export PATH=/mnt/c/Users/pedro/openssh-portable/OpenSSH-Win64_symbols/:$PATH

    6.2 Check ssh's version string:

    $ ssh.exe -V
    OpenSSH_for_Windows_8.6p1, LibreSSL 3.3.3

7. Testing standalone ssh in WSL2

    > ssh.exe git@github.com
    <type enter to force ssh to request a shell>
    Hi martelletto! You've successfully authenticated, but GitHub does not provide shell access.

8. Testing git + ssh in WSL2

    8.1 Set the GIT_SSH environment variable:

    $ export GIT_SSH=/mnt/c/Users/pedro/openssh-portable/OpenSSH-Win64_symbols/ssh.exe

    8.2 Clone a repository (can be public) over ssh:

    $ git clone ssh://git@github.com/yubico/libfido2