Cryptographic Algorithm Implementation Requirements and Usage Guidance for Encapsulating Security Payload (ESP) and Authentication Header (AH)
RFC 8221

Document Type RFC - Proposed Standard (October 2017; No errata)
Obsoletes RFC 7321
Last updated 2017-10-17
Replaces draft-mglt-ipsecme-rfc7321bis
Stream IETF
Formats plain text pdf html bibtex
Reviews
Stream WG state Submitted to IESG for Publication
Document shepherd David Waltermire
Shepherd write-up Show (last changed 2017-02-15)
IESG IESG state RFC 8221 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Eric Rescorla
Send notices to "David Waltermire" <david.waltermire@nist.gov>
IANA IANA review state Version Changed - Review Needed
IANA action state No IC
Internet Engineering Task Force (IETF)                        P. Wouters
Request for Comments: 8221                                       Red Hat
Obsoletes: 7321                                               D. Migault
Category: Standards Track                                    J. Mattsson
ISSN: 2070-1721                                                 Ericsson
                                                                  Y. Nir
                                                             Check Point
                                                              T. Kivinen
                                                            October 2017

 Cryptographic Algorithm Implementation Requirements and Usage Guidance
for Encapsulating Security Payload (ESP) and Authentication Header (AH)

Abstract

   This document replaces RFC 7321, "Cryptographic Algorithm
   Implementation Requirements and Usage Guidance for Encapsulating
   Security Payload (ESP) and Authentication Header (AH)".  The goal of
   this document is to enable ESP and AH to benefit from cryptography
   that is up to date while making IPsec interoperable.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8221.

Wouters, et al.              Standards Track                    [Page 1]
RFC 8221            ESP and AH Algorithm Requirements       October 2017

Copyright Notice

   Copyright (c) 2017 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Updating Algorithm Implementation Requirements and Usage
           Guidance  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.2.  Updating Algorithm Requirement Levels . . . . . . . . . .   3
     1.3.  Document Audience . . . . . . . . . . . . . . . . . . . .   4
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   5
   3.  Manual Keying . . . . . . . . . . . . . . . . . . . . . . . .   5
   4.  Encryption Must Be Authenticated  . . . . . . . . . . . . . .   6
   5.  ESP Encryption Algorithms . . . . . . . . . . . . . . . . . .   7
   6.  ESP and AH Authentication Algorithms  . . . . . . . . . . . .   9
   7.  ESP and AH Compression Algorithms . . . . . . . . . . . . . .  10
   8.  Summary of Changes from RFC 7321  . . . . . . . . . . . . . .  11
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  11
   10. Security Considerations . . . . . . . . . . . . . . . . . . .  11
   11. References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     11.1.  Normative References . . . . . . . . . . . . . . . . . .  12
     11.2.  Informative References . . . . . . . . . . . . . . . . .  12
   Acknowledgements  . . . . . . . . . . . . . . . . . . . . . . . .  15
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

Wouters, et al.              Standards Track                    [Page 2]
RFC 8221            ESP and AH Algorithm Requirements       October 2017

1.  Introduction

   The Encapsulating Security Payload (ESP) [RFC4303] and the
   Authentication Header (AH) [RFC4302] are the mechanisms for applying
   cryptographic protection to data being sent over an IPsec Security
   Association (SA) [RFC4301].

   This document provides guidance and recommendations so that ESP and
   AH can be used with cryptographic algorithms that are up to date.
   The challenge of such documents is making sure that, over time, IPsec
   implementations can use secure and up-to-date cryptographic
   algorithms while keeping IPsec interoperable.

1.1.  Updating Algorithm Implementation Requirements and Usage Guidance

   The field of cryptography evolves continuously: new, stronger
   algorithms appear, and existing algorithms are found to be less
   secure than originally thought.  Therefore, algorithm implementation
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