ssh-sk-helper (FIDO2/U2F ssh support) missing dependencies

[peterh]

ssh-sk-helper.exe cannot run, because it is missing a handful of dependencies. To work around this issue, I copied the following DLLs from C:\Program Files\Git\usr\bin to C:\Program Files\Git\usr\lib\ssh:

msys-2.0.dll
msys-cbor-0.11.dll
msys-crypto-3.dll
msys-fido2-1.dll
msys-gcc_s-seh-1.dll
msys-z.dll

Full environment details:

• I was not able to find an open or closed issue matching what I'm seeing

#2525 appears to be the original feature request, but does not say anything about this issue.

Setup

• Which version of Git for Windows are you using? Is it 32-bit or 64-bit?

C:\> git --version --build-options

git version 2.47.0.windows.1
cpu: x86_64
built from commit: d53e4648cb65eb75dd8d8a093d17400a18a9a15d
sizeof-long: 4
sizeof-size_t: 8
shell-path: D:/git-sdk-64-build-installers/usr/bin/sh
feature: fsmonitor--daemon
libcurl: 8.10.1
OpenSSL: OpenSSL 3.2.3 3 Sep 2024
zlib: 1.3.1

(Same with the previous couple of versions too)

• Which version of Windows are you running? Vista, 7, 8, 10? Is it 32-bit or 64-bit?

Windows 11 22H2

C:\> cmd.exe /c ver

Microsoft Windows [Version 10.0.22621.4169]

• What options did you set as part of the installation? Or did you choose the
  defaults?

C:\> type "C:\Program Files\Git\etc\install-options.txt"

Editor Option: VIM
Custom Editor Path:
Default Branch Option:
Path Option: Cmd
SSH Option: OpenSSH
Tortoise Option: false
CURL Option: OpenSSL
CRLF Option: CRLFCommitAsIs
Bash Terminal Option: MinTTY
Git Pull Behavior Option: Merge
Use Credential Manager: Enabled
Performance Tweaks FSCache: Enabled
Enable Symlinks: Disabled
Enable FSMonitor: Disabled

• Any other interesting things about your environment that might be related
  to the issue you're seeing?

Tested a YubiKey "Security Key C NFC" (not to be confused with the YubiKey "5C NFC", which looks the same but has more features) and a Hypersecu "HyperFIDO Pro Mini"

Details

• Which terminal/shell are you running Git from? e.g Bash/CMD/PowerShell/other

cmd

• What commands did you run to trigger this issue? If you can provide a
  Minimal, Complete, and Verifiable example
  this will help us understand the issue.

ssh-keygen -t ed25519-sk, add the id_ed25519_sk.pub to github, gitlab, or "servername", ssh servername

• What did you expect to occur after running these commands?

Prompt to touch security key, followed by ssh connection to server.

• What actually happened instead?

ssh-sk-helper.exe crashed, there was no security key prompt, and the ssh connection did not complete.

• If the problem was occurring with a specific repository, can you provide the
  URL to that repository to help us with testing?

No specific repository.

[dscho]

shell-path: D:/git-sdk-64-build-installers/usr/bin/sh

That seems not exactly to be a supported scenario. Have you not installed this via the official installer? I ask because when I run ssh-keygen -t ed25519-sk from a regular Git Bash, as installed by the regular Git for Windows v2.47.0 installer, I do not get a crash, but a couple of dialogs until one asks for a USB security key to be inserted.