Problem signing git commits with smartcard key

[Jacob Adams]

On 05/31/2018 10:12 AM, kookie at spacekookie.de wrote:
> Hey there,
> 
> I have a yubikey 4 that contains my GPG key. I can use the `gpg2` tool to sign messages without problems. But when I try to do the same with git, it fails. The command that git runs internally is equivalent to this:
> 
> echo "This is a stream from git..." | gpg2 --status-fd=2 -bsau 555F2E4B6F87F91A4110669E90734A9E619C8A6C
> 
> Which outputs the following error:
> 
> [GNUPG:] KEY_CONSIDERED 555F2E4B6F87F91A4110669E90734A9E619C8A6C 0
> [GNUPG:] BEGIN_SIGNING H8
> gpg: signing failed: Invalid ID
> [GNUPG:] FAILURE sign 100663414
> gpg: signing failed: Invalid ID

I think this is simply because you have the wrong key id in your command
(Thus "Invalid ID").
Assuming that the key on hkps.pool.sks-keyservers.net is correct, your
key id should be 9F18A093CF65F938E4C8EFA429E057516FE1BBF3, not
555F2E4B6F87F91A4110669E90734A9E619C8A6C

Hope this helps,
Jacob


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