phc-discussions - pre-hashed passwords?

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Date: Tue, 17 Mar 2015 14:08:41 +0100
From: Jean-Philippe Aumasson <jeanphilippe.aumasson@...il.com>
To: discussions@...sword-hashing.net
Subject: pre-hashed passwords?

(After reading this nice post about passwords including null bytes:
http://blog.ircmaxell.com/2015/03/security-issue-combining-bcrypt-with.html)

Has anyone already seen password hashes "pre-hashing" a password, to
handle length limitations? Things like

password_hash(hash('sha256', $password, true), PASSWORD_DEFAULT)

password_hash(hash_hmac('sha256', $password, $key, true), PASSWORD_DEFAULT)