Algorithm Identifiers for the HMAC-based Extract-and-Expand Key Derivation Function (HKDF)
RFC 8619

Document Type RFC - Proposed Standard (June 2019; No errata)
Was draft-housley-hkdf-oids (individual in sec area)
Last updated 2019-06-19
Stream IETF
Formats plain text pdf html bibtex
Reviews
Stream WG state (None)
Document shepherd No shepherd assigned
IESG IESG state RFC 8619 (Proposed Standard)
Consensus Boilerplate Yes
Telechat date
Responsible AD Benjamin Kaduk
Send notices to (None)
IANA IANA review state IANA OK - Actions Needed
IANA action state RFC-Ed-Ack
Internet Engineering Task Force (IETF)                        R. Housley
Request for Comments: 8619                                Vigil Security
Category: Standards Track                                      June 2019
ISSN: 2070-1721

                     Algorithm Identifiers for the
      HMAC-based Extract-and-Expand Key Derivation Function (HKDF)

Abstract

   RFC 5869 specifies the HMAC-based Extract-and-Expand Key Derivation
   Function (HKDF) algorithm.  This document assigns algorithm
   identifiers to the HKDF algorithm when used with three common one-way
   hash functions.

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/rfc8619.

Copyright Notice

   Copyright (c) 2019 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.

Housley                      Standards Track                    [Page 1]
RFC 8619                        HKDF OIDs                      June 2019

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   2
     1.2.  ASN.1 . . . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  HKDF Algorithm Identifiers  . . . . . . . . . . . . . . . . .   2
   3.  ASN.1 Module  . . . . . . . . . . . . . . . . . . . . . . . .   3
   4.  Security Considerations . . . . . . . . . . . . . . . . . . .   4
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   4
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     6.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     6.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The HKDF algorithm [RFC5869] is a key derivation function based on
   the Hashed Message Authentication Code (HMAC).  This document assigns
   algorithm identifiers to the HKDF algorithm when used with three
   common one-way hash functions.  These algorithm identifiers are
   needed to make use of the HKDF in some security protocols, such as
   the Cryptographic Message Syntax (CMS) [RFC5652].

1.1.  Terminology

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
   "OPTIONAL" in this document are to be interpreted as described in
   BCP 14 [RFC2119] [RFC8174] when, and only when, they appear in all
   capitals, as shown here.

1.2.  ASN.1

   In this specification, values are generated using ASN.1 [X.680] using
   the Basic Encoding Rules (BER) and the Distinguished Encoding Rules
   (DER) [X.690].

2.  HKDF Algorithm Identifiers

   This section assigns three algorithm identifiers to HKDF [RFC5869]
   used with three common one-way hash functions that are specified in
   [SHS]: SHA-256, SHA-384, and SHA-512.  When any of these three object
   identifiers appear within the ASN.1 type AlgorithmIdentifier, the
   parameters component of that type SHALL be absent.

   The specification of AlgorithmIdentifier is available in [RFC5911],
   which evolved from the original definition in X.509 [X.509-88].

Housley                      Standards Track                    [Page 2]
RFC 8619                        HKDF OIDs                      June 2019

   The assigned object identifiers are:

   id-alg-hkdf-with-sha256 OBJECT IDENTIFIER ::= { iso(1) member-body(2)
       us(840) rsadsi(113549) pkcs(1) pkcs-9(9) smime(16) alg(3) 28 }

   id-alg-hkdf-with-sha384 OBJECT IDENTIFIER ::= { iso(1) member-body(2)
       us(840) rsadsi(113549) pkcs(1) pkcs-9(9) smime(16) alg(3) 29 }

   id-alg-hkdf-with-sha512 OBJECT IDENTIFIER ::= { iso(1) member-body(2)
       us(840) rsadsi(113549) pkcs(1) pkcs-9(9) smime(16) alg(3) 30 }

3.  ASN.1 Module

   This section contains the ASN.1 module for the HKDF algorithm
Show full document text