I downloaded the zip and the signature file using the web browser on Windows 11 and then in the power shell executed the following command but it never completes:
PS C:\Users\salil\Downloads\grapheneos> cmd /c 'ssh-keygen -Y verify -f allowed_signers -I contact@grapheneos.org -n "factory images" -s panther-install-2025100900.zip.sig < panther-install-2025100900.zip'
the folder C:\Users\salil\Downloads\grapheneos has all 3 files. I tried this via command prompt also but even that doesn't complete. I can see in the task manager ssk-keygen is running.
When I use -v I just get the line:
debug1: sshsig_verify_fd: signature made with hash "sha512"and then it gets stuck