[rfc-dist] RFC 4868 on Using HMAC-SHA-256, HMAC-SHA-384, and HMAC-SHA-512 with IPsec

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        RFC 4868

        Title:      Using HMAC-SHA-256, HMAC-SHA-384, and HMAC-SHA-512 
                    with IPsec 
        Author:     S. Kelly, S. Frankel
        Status:     Standards Track
        Date:       May 2007
        Mailbox:    scott at hyperthought.com, 
                    sheila.frankel at nist.gov
        Pages:      21
        Characters: 41432
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-kelly-ipsec-ciph-sha2-01.txt

        URL:        http://www.rfc-editor.org/rfc/rfc4868.txt

This specification describes the use of Hashed Message Authentication
Mode (HMAC) in conjunction with the SHA-256, SHA-384, and SHA-512
algorithms in IPsec.  These algorithms may be used as the basis for
data origin authentication and integrity verification mechanisms for
the Authentication Header (AH), Encapsulating Security Payload (ESP),
Internet Key Exchange Protocol (IKE), and IKEv2 protocols, and also
as Pseudo-Random Functions (PRFs) for IKE and IKEv2.  Truncated
output lengths are specified for the authentication-related variants,
with the corresponding algorithms designated as HMAC-SHA-256-128,
HMAC-SHA-384-192, and HMAC-SHA-512-256.  The PRF variants are not
truncated, and are called PRF-HMAC-SHA-256, PRF-HMAC-SHA-384, and
PRF-HMAC-SHA-512.  [STANDARDS TRACK]

This is now a Proposed Standard Protocol.

STANDARDS TRACK: This document specifies an Internet standards track
protocol for the Internet community,and requests discussion and 
suggestions for improvements.Please refer to the current edition of the 
Internet Official Protocol Standards (STD 1) for the standardization 
state and status of this protocol.  Distribution of this memo is 
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