[tor-bugs] #12981 [Tor]: Add backends for encrypted storage, scrypt

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#12981: Add backends for encrypted storage, scrypt
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 Reporter:  nickm             |          Owner:
     Type:  defect            |         Status:  new
 Priority:  normal            |      Milestone:  Tor: 0.2.6.x-final
Component:  Tor               |        Version:
 Keywords:  tor-relay scrypt  |  Actual Points:
Parent ID:                    |         Points:
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 We need an encrypted storage format for private keys that is better than
 openssl's armor, once we start storing ed25519 private keys (optionally
 encrypted).

 We should also use a better passphrase-based-key-derivation function than
 we have now.  scrypt isn't my favorite, but until the PHC is done, it's
 probably a good choice.

 Once those are in, we can use scrypt in place of our current openpgp
 RFC2440 password-to-key function.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12981>
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