Drop in replacement for gnome-keyring with ed25519 support

[graysky]

I love the convience that gnome-keyring provides unlocking my private keys (~/.ssh/id_rsa*) when I log in. The problem is that gnome-keyring does not support the new SSH protocol 2 private key format nor does it support several newer ciphers including elliptic curve based ed25519. Is there an alternative agent manager that:

1) Unlocks keys upon login and never asks for the key's password again.
2) Supports the ed25519 cipher.

I have found this blog post wherein a method using a patch ssh-agent is presented. The problem with it is it violates my criteria #1. Thanks!

Links to gnome-keyring bugs:
https://bugzilla.gnome.org/show_bug.cgi?id=641082
https://bugzilla.gnome.org/show_bug.cgi?id=723274
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