However, generating an ecdsa-sk SSH key works without an issue: $ ssh-keygen -vvv -t ecdsa-sk You may need to touch your authenticator to authorize key generation.ĭebug1: start_helper: starting /usr/lib/openssh/ssh-sk-helperĭebug1: sshsk_enroll: provider 'internal', device '(null)', application 'ssh:', userid '(null)', flags 0x01, challenge len 0ĭebug1: sshsk_enroll: using random challengeĭebug1: ssh_sk_enroll: using device /dev/hidraw9ĭebug1: ssh_sk_enroll: fido_dev_make_cred: FIDO_ERR_INVALID_ARGUMENTĭebug1: sshsk_enroll: provider 'internal' returned failure -1ĭebug1: ssh-sk-helper: Enrollment failed: invalid formatĭebug1: client_converse: helper returned error -4 Generating public/private ed25519-sk key pair. See below for the command I'm using and its output: $ ssh-keygen -vvv -t ed25519-sk

I'm using OpenSSH version: OpenSSH_8.2p1 Ubuntu-4ubuntu0.3, OpenSSL 1.1.1f.

However, I get a 255 error code when I try. I'm trying to generate an ed25519-sk SSH key in Ubuntu 20.04.03 LTS.

Ssh keygen ed25519