a document that may be of interest to you: second draft of NIST's "Recommendation for Key Derivation through Extraction-then-Expansion", which is compatible with RFC 5869 "HMAC-based Extract-and-Expand Key Derivation Function (HKDF)", which was discussed on this list a couple of years back.  Comments period ends on August 11.  http://csrc.nist.gov/news_events/index.html#july12

David

From: NIST Computer Security Resource Center <csrc.nist <at> service.govdelivery.com>

Date: July 12, 2011 2:25:06 PM PDT

To: nist-interest <at> cisco.com

Subject: NIST Released 2 Draft Special Publications: 800-126 Rev. 2 and Special Publication 800-56C

Reply-To: NIST Computer Security Resource Center <csrc.nist <at> service.govdelivery.com>

Today, NIST Computer Security Division released 2 Draft Special Publications.  See below for the details.  Each draft will have 2 URLs - one will take you to the full announcement on the CSRC News page and the second URL will take you to the same announcement on the CSRC Drafts page.  The announcement and link are the same announcement for each draft.

Draft #1: Second Draft Special Publication 800-56C, Recommendation for Key Derivation through Extraction-then-Expansion

CSRC News page for this Draft document:
http://csrc.nist.gov/news_events/index.html#july12
- OR -
CSRC Drafts page for this Draft document:
http://csrc.nist.gov/publications/PubsDrafts.html#SP-800-56-C