[Bug 1590081] Re: twisted's conch does not support ed25519 and ecdsa ssh public keys

[LaMont Jones]

2016-06-08 13:01:15 [maasserver] ERROR: Invalid SSH public key
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/maasserver/models/sshkey.py", line 41, in validate_ssh_public_key
    key = Key.fromString(value.encode("utf-8"))
  File "/usr/lib/python3/dist-packages/twisted/conch/ssh/keys.py", line 118, in fromString
    raise BadKeyError('cannot guess the type of %r' % (data,))
twisted.conch.ssh.keys.BadKeyError: cannot guess the type of b'ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBKHbdCD8RGTwodwdKnfnd6xOBjRMsh9AL+FTeSst2T9IkEeMhKr/dEr7mzFdHzkS1XvdpYCxQxJ4R5Ik4HCONLM= lamont at tigernut'

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https://bugs.launchpad.net/bugs/1590081

Title:
  twisted's conch does not support ed25519 and ecdsa ssh public keys

Status in MAAS:
  New
Status in twisted package in Ubuntu:
  New

Bug description:
  When adding public keys to a user account, ed25519 and ecdsa public
  keys are showing as not supported public key types; the UI presents
  "Invalid SSH public key" as feedback.

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