Alert user on unsupported encryption key types.

[sampsapenna]

Proposed solution

The UI should give a clear indication if the encryption key given as input can't be used. ssh-ed25519 along with crypt4gh-key are the supported key types, so those are the only ones to be accepted.

DoD (Definition of Done)

User can't mistakenly input non-working keys in, or the user is alerted that the key they tried to encrypt with is invalid.

Testing

Frontend tests for inputting incorrect key files, or manual testing for development.

[juhtornr]

We should clarify if it should be possible to support user's own encryption keys in the service.