INTERNET-DRAFT R. Housley Intended Status: Proposed Standard Vigil Security Expires: 11 July 2019 11 January 2019 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 Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79. Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet- Drafts is at http://datatracker.ietf.org/drafts/current/. Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress." 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 (http://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 [Page 1] INTERNET-DRAFT HKDF OIDs January 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 . . . . . . . . . . . . . . . . . . 5 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 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 CMS values are generated using ASN.1 [X.680], which uses the Basic Encoding Rules (BER) and the Distinguished Encoding Rules (DER) [X.690]. 2. HKDF Algorithm Identifiers This section assigns algorithm identifier 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 appears within the ASN.1 type AlgorithmIdentifier, the parameters component of that type SHALL be absent. The specification of AlgorithmIdentifier is available in [RFC5911], which is an evolution from the original definition in X.509 [X.509-88]. Housley [Page 2] INTERNET-DRAFT HKDF OIDs January 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) TBD1 } 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) TBD2 } 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) TBD3 } 3. ASN.1 Module This section contains the ASN.1 module for the HKDF algorithm identifiers. This module imports types from other ASN.1 modules that are defined in [RFC5912]. HKDF-OID-2019 { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-9(9) smime(16) modules(0) id-mod-hkdf-oid-2019(TBD0) } DEFINITIONS IMPLICIT TAGS ::= BEGIN -- EXPORTS All IMPORTS AlgorithmIdentifier{}, KEY-DERIVATION FROM AlgorithmInformation-2009 -- [RFC5912] { iso(1) identified-organization(3) dod(6) internet(1) security(5) mechanisms(5) pkix(7) id-mod(0) id-mod-algorithmInformation-02(58) } ; -- -- Object Identifiers -- 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) TBD1 } 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) TBD2 } 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) TBD3 } Housley [Page 3] INTERNET-DRAFT HKDF OIDs January 2019 -- -- Key Derivation Algorithm Identifiers -- KeyDevAlgs KEY-DERIVATION ::= { kda-hkdf-with-sha256 | kda-hkdf-with-sha384 | kda-hkdf-with-sha512, ... } kda-hkdf-with-sha256 KEY-DERIVATION ::= { IDENTIFIER id-alg-hkdf-with-sha256 PARAMS ARE absent SMIME-CAPS { IDENTIFIED BY id-alg-hkdf-with-sha256 } } kda-hkdf-with-sha384 KEY-DERIVATION ::= { IDENTIFIER id-alg-hkdf-with-sha384 PARAMS ARE absent SMIME-CAPS { IDENTIFIED BY id-alg-hkdf-with-sha384 } } kda-hkdf-with-sha512 KEY-DERIVATION ::= { IDENTIFIER id-alg-hkdf-with-sha512 PARAMS ARE absent SMIME-CAPS { IDENTIFIED BY id-alg-hkdf-with-sha512 } } END 4. Security Considerations In spite of the simplicity of HKDF, there are many security considerations that have been taken into account in the design and analysis of this construction. An exposition of all of these aspects is well beyond the scope of this document. Please refer to [EPRINT] for detailed information, including rationale for the HKDF design. 5. IANA Considerations One object identifier for the ASN.1 module in the Section ??? was assigned in the SMI Security for S/MIME Module Identifiers (1.2.840.113549.1.9.16.0) [IANA-MOD] registry: id-mod-hkdf-oid-2019 OBJECT IDENTIFIER ::= { iso(1) member-body(2) us(840) rsadsi(113549) pkcs(1) pkcs-9(9) smime(16) mod(0) TBD0 } Three object identifiers for the HKDF algorithm identifiers were assigned in the SMI Security for S/MIME Mail Security Algorithms Housley [Page 4] INTERNET-DRAFT HKDF OIDs January 2019 (1.2.840.113549.1.9.16.3) [IANA-ALG] registry: 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) TBD1 } 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) TBD2 } 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) TBD3 } 6. References 6.1. Normative References [SHS] National Institute of Standards and Technology, "Secure Hash Standard (SHS)", FIPS PUB 180-4, August 2015. [RFC2119] Bradner, S., "Key words for use in RFCs to Indicate Requirement Levels", BCP 14, RFC 2119, March 1997. [RFC5652] Housley, R., "Cryptographic Message Syntax (CMS)", RFC 5652, September 2009. [RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC 2119 Key Words", BCP 14, RFC 8174, May 2017. [X.680] ITU-T, "Information technology -- Abstract Syntax Notation One (ASN.1): Specification of basic notation", ITU-T Recommendation X.680, 2015. [X.690] ITU-T, "Information technology -- ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER)", ITU-T Recommendation X.690, 2015. 6.2. Informative References [EPRINT] Krawczyk, H., "Cryptographic Extraction and Key Derivation: The HKDF Scheme", Proceedings of CRYPTO 2010, 2010, . [IANA-ALG] https://www.iana.org/assignments/smi-numbers/smi- numbers.xhtml#security-smime-3. [IANA-MOD] https://www.iana.org/assignments/smi-numbers/smi- numbers.xhtml#security-smime-0. Housley [Page 5] INTERNET-DRAFT HKDF OIDs January 2019 [RFC5911] Hoffman, P., and J. Schaad, "New ASN.1 Modules for Cryptographic Message Syntax (CMS) and S/MIME", RFC 5911, June 2010. [RFC5912] Hoffman, P., and J. Schaad, "New ASN.1 Modules for the Public Key Infrastructure Using X.509 (PKIX)" RFC 5912, June 2010. [X.509-88] CCITT. Recommendation X.509: The Directory - Authentication Framework, 1988. Author's Address Russell Housley Vigil Security, LLC 515 Dranesville Road Herndon, VA 20170 USA EMail: housley@vigilsec.com Housley [Page 6]