gistfile1.txt

dave@armie:~ $ ssh-keygen -vvv -t ecdsa-sk -O no-touch-required -N "" -C "$(date +'%Y%m%d')-google1" -f /tmp/google1
Generating public/private ecdsa-sk key pair.
You may need to touch your authenticator to authorize key generation.
debug3: start_helper: started pid=18011
debug3: ssh_msg_send: type 5
debug3: ssh_msg_recv entering
debug1: start_helper: starting /usr/lib/openssh/ssh-sk-helper
debug1: sshsk_enroll: provider "internal", device "(null)", application "ssh:", userid "(null)", flags 0x00, challenge len 0
debug1: sshsk_enroll: using random challenge
debug1: sk_probe: 1 device(s) detected
debug1: sk_probe: selecting sk by touch
debug1: ssh_sk_enroll: using device /dev/hidraw0
debug3: ssh_sk_enroll: attestation cert len=349
debug3: ssh_sk_enroll: authdata len=198
debug1: ssh-sk-helper: reply len 870
debug3: ssh_msg_send: type 5
debug3: reap_helper: pid=18011
Your identification has been saved in /tmp/google1
Your public key has been saved in /tmp/google1.pub
The key fingerprint is:
SHA256:bRd0heZ9XzWnT2OS7p9OwX32xAEE15HGRdIkMVlEpJM 20220322-google1
The key's randomart image is:
+-[ECDSA-SK 256]--+
|           .++O#&|
|           ...=%+|
|            .oE++|
|         .   ++=B|
|        S o o o=@|
|         . . . o*|
|            .  ..|
|             .. .|
|              o+ |
+----[SHA256]-----+
dave@armie:~ $ ssh-keygen -vvv -O no-touch-required -Y sign -f /tmp/google1 -n file trash1.txt
debug1: Couldn't get agent socket: agent not present
Signing file trash1.txt
debug2: hash_file: hashed 6 bytes
debug3: hash_file: final hash: e7c22b994c59d9cf2b48e549b1e24666636045930d3da7c1acb299d1c3b7f931f94aae41edda2c2b207a36e10f8bcb8d45223e54878f5b316e7ce3b6bc019629
debug3: start_helper: started pid=18013
debug3: ssh_msg_send: type 5
debug3: ssh_msg_recv entering
debug1: start_helper: starting /usr/lib/openssh/ssh-sk-helper
debug1: ssh-sk-helper: ready to sign with key ECDSA-SK, provider internal: msg len 96, compat 0x0
debug1: sshsk_sign: provider "internal", key ECDSA-SK, flags 0x00
debug1: sk_probe: 1 device(s) detected
debug1: sk_probe: selecting sk by cred
debug1: ssh_sk_sign: fido_dev_get_assert: FIDO_ERR_USER_PRESENCE_REQUIRED
debug1: sshsk_sign: sk_sign failed with code -1
debug1: ssh-sk-helper: Signing failed: invalid format
debug1: ssh-sk-helper: reply len 8
debug3: ssh_msg_send: type 5
debug1: client_converse: helper returned error -4
debug3: reap_helper: pid=18013
Couldn't sign message: invalid format
Signing trash1.txt failed: invalid format