Network Working Group M. Bhatia
Request for Comments: 5709 Alcatel-Lucent
Updates: 2328 V. Manral
Category: Standards Track IP Infusion
Aegis Data Security
OSPFv2 HMAC-SHA Cryptographic Authentication
This document describes how the National Institute of Standards and
Technology (NIST) Secure Hash Standard family of algorithms can be
used with OSPF version 2's built-in, cryptographic authentication
mechanism. This updates, but does not supercede, the cryptographic
authentication mechanism specified in RFC 2328.
Status of This Memo
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 unlimited.
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Bhatia, et al. Standards Track [Page 1]RFC 5709 OSPFv2 HMAC-SHA October 2009
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it for publication as an RFC or to translate it into languages other
A variety of risks exist when deploying any routing protocol
[Bell89]. This document provides an update to OSPFv2 Cryptographic
Authentication, which is specified in Appendix D of RFC 2328. This
document does not deprecate or supercede RFC 2328. OSPFv2, itself,
is defined in RFC 2328 [RFC2328].
This document adds support for Secure Hash Algorithms (SHA) defined
in the US NIST Secure Hash Standard (SHS), which is defined by NIST
FIPS 180-2. [FIPS-180-2] includes SHA-1, SHA-224, SHA-256, SHA-384,
and SHA-512. The Hashed Message Authentication Code (HMAC)
authentication mode defined in NIST FIPS 198 is used [FIPS-198].
It is believed that [RFC2104] is mathematically identical to
[FIPS-198] and it is also believed that algorithms in [RFC4634] are
mathematically identical to [FIPS-180-2].
The creation of this addition to OSPFv2 was driven by operator
requests that they be able to use the NIST SHS family of algorithms
in the NIST HMAC mode, instead of being forced to use the Keyed-MD5
algorithm and mode with OSPFv2 Cryptographic Authentication.
Cryptographic matters are discussed in more detail in the Security
Considerations section of this document.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this