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Title : US Secure Hash Algorithms (SHA and SHA based HMAC and HKDF)
Author(s) : D. Eastlake 3rd, T. Hansen
Filename : draft-eastlake-sha2b-00.txt
Pages : 127
Date : 2010-4-13
This document is an update of [RFC4634] to fix errata and to add code
for an HMAC-based extract-and-expand key derivation function.
The United States of America has adopted a suite of secure hash
algorithms (SHAs), including four beyond SHA-1, as part of a Federal
Information Processing Standard (FIPS), specifically SHA-224,
SHA-256, SHA-384, and SHA-512. The purpose of this document is to
make open source code performing the SHA hash functions conveniently
available to the Internet community. The sample code supports input
strings of arbitrary bit length. Much of the text herein was adapted
by the authors from FIPS 180-2.
As with [RFC4634], code to perform SHA based HMACs is included and,
new in this version, code for HKDF is included.
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