Rename "PhabricatorHash::digest()" to "weakDigest()"

Summary: Ref T12509. This encourages code to move away from HMAC+SHA1 by making the method name more obviously undesirable.

Test Plan: `grep`, browsed around.

Reviewers: chad

Reviewed By: chad

Maniphest Tasks: T12509

Differential Revision: https://secure.phabricator.com/D17632

src/applications/auth/controller/PhabricatorAuthOneTimeLoginController.php

@@ -135,7 +135,7 @@ final class PhabricatorAuthOneTimeLoginController
             ->setTokenResource($target_user->getPHID())
             ->setTokenType($password_type)
             ->setTokenExpires(time() + phutil_units('1 hour in seconds'))
-            ->setTokenCode(PhabricatorHash::digest($key))
+            ->setTokenCode(PhabricatorHash::weakDigest($key))
             ->save();
         unset($unguarded);