Internet DRAFT - draft-steele-cose-kyber
draft-steele-cose-kyber
CBOR Object Signing and Encryption O. Steele
Internet-Draft Transmute
Intended status: Informational 13 November 2022
Expires: 17 May 2023
COSE Kyber
draft-steele-cose-kyber-00
Abstract
This specification defines how to represent cryptographic keys for
Kyber, an IND-CCA2-secure key encapsulation mechanism (KEM), for use
with the key representation formats of JSON Web Key (JWK) and COSE
(COSE_Key).
About This Document
This note is to be removed before publishing as an RFC.
Status information for this document may be found at
https://datatracker.ietf.org/doc/draft-steele-cose-kyber/.
Discussion of this document takes place on the cose Working Group
mailing list (mailto:cose@ietf.org), which is archived at
https://mailarchive.ietf.org/arch/browse/cose/. Subscribe at
https://www.ietf.org/mailman/listinfo/cose/.
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 https://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
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on 17 May 2023.
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Copyright Notice
Copyright (c) 2022 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 Revised BSD License text as
described in Section 4.e of the Trust Legal Provisions and are
provided without warranty as described in the Revised BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
2. Conventions and Definitions . . . . . . . . . . . . . . . . . 3
2.1. Representation Definition . . . . . . . . . . . . . . . . 3
2.1.1. JSON Web Key Representation . . . . . . . . . . . . . 3
2.1.2. Lattice Parameter Registration . . . . . . . . . . . 3
3. Security Considerations . . . . . . . . . . . . . . . . . . . 4
4. Test Vectors . . . . . . . . . . . . . . . . . . . . . . . . 4
4.1. OKP Kyber-1024 . . . . . . . . . . . . . . . . . . . . . 4
4.1.1. publicKeyJwk . . . . . . . . . . . . . . . . . . . . 4
4.1.2. privateKeyJwk . . . . . . . . . . . . . . . . . . . . 5
4.1.3. cyphertext . . . . . . . . . . . . . . . . . . . . . 7
4.1.4. secret . . . . . . . . . . . . . . . . . . . . . . . 7
5. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 7
5.1. JSON Web Key Lattice Registry . . . . . . . . . . . . . . 8
5.1.1. Registration Template . . . . . . . . . . . . . . . . 8
5.1.2. Initial Registry Contents . . . . . . . . . . . . . . 9
6. References . . . . . . . . . . . . . . . . . . . . . . . . . 9
6.1. Normative References . . . . . . . . . . . . . . . . . . 9
6.2. Informative References . . . . . . . . . . . . . . . . . 9
Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . . 10
Author's Address . . . . . . . . . . . . . . . . . . . . . . . . 10
1. Introduction
TODO Introduction
For additional details regarding kyber see pq-crystals.org/kyber
(https://pq-crystals.org/kyber/).
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2. Conventions and Definitions
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.
2.1. Representation Definition
The following definitions apply to the lattice based key
encapsulation mechanism known as Kyber.
2.1.1. JSON Web Key Representation
When expressing a cryptographic key for these lattices in JSON Web
Key (JWK) form, the following rules apply:
* The parameter "kty" MUST be present and set to "OKP".
* The parameter "lat" MUST be present and value MUST be one defined
in (#lattice-parameter-registration).
* The parameter "x" MUST be present whose value represents the
public key. This value MUST be encoded using the serialization
defined in [I-D.draft-cfrg-schwabe-kyber] Appendix C and MUST be
base64url encoded without padding as defined in [RFC7515]
Appendix C.
* The parameter "d" MUST be present for private key representations
whose value MUST contain the little-endian representation of the
private key base64url encoded without padding as defined in
[RFC7515] Appendix C. This parameter MUST NOT be present for
public keys.
2.1.2. Lattice Parameter Registration
+=====+============+
| kty | lat |
+=====+============+
| OKP | Kyber-1024 |
+-----+------------+
| OKP | Kyber-768 |
+-----+------------+
| OKP | Kyber-512 |
+-----+------------+
Table 1
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3. Security Considerations
TODO Security
4. Test Vectors
TODO Test Vectors
4.1. OKP Kyber-1024
4.1.1. publicKeyJwk
{ "kty": "OKP", "lat": "Kyber-1024", "x":\
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4.1.2. privateKeyJwk
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\5YRdOIOiInopKPE92fNORzxu0OF3x0WFOQwZo6Cg0FgHpyC3ayCkJHcxmZUrk-oHTpE\
\PgBxQdsF-0hUkZglzzQokI2oIxMACY4izsdyeXNShDGM68vd3qyFrX_bF2UPG1dC-Lm\
\l9ziu_K6AlvReI9RA-W1lqLfV6ONYsrdiukASaJ6wn-5iK1dKvPoQ6gTstROaEIpAhB\
\tcUUWqx0cYYHOzI5BWKGsGZTiB75nM9udW8IQYmxTlaS7bH5IgbDNqk5qsrwopC6BBT\
\HzsnC3q153GeL9w373Y8eiqrzcZlVxh-j9O4FlhFiQobqsIOv1dssGBX2jxaA6dqMju\
\PyXA3MPeiuCMYNIud9tYET_mgSuCE6lpmPyEwDPZ8FuyUfGdOjRpPXAl6LnR_uJiZc2\
\IGowhAiRl7b1Gt1Se7NqJEijpiWnKP_FTCctoDonZv4VuNBbhgd7jEIcOkeTa0v_Npl\
\Bhc7Oa-UzcP02FdRfhe_ABNlgtofKGL3JoAL1hIL5NV4DOEkGQEEUmT5zdj3QBW92gO\
\PmqTLblpSPIawWhIgjs_zBy6yMgX-kmHjiqRbLGjAPQihgx02gJNl0ak8wakDwas0UU\
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\8FwEBFgjIqeGoS70kuJkh3mahkk8YbSxXB1AzELxuOCl5TOexDg72vmGI7tHAdjRysc\
\gjcWmxpLswUqKUKu4jZmt5nKoraZrIBvBRNRK0LQqN7KnTm8sXBefxSIaccTyiBKJdY\
\VCc" }
4.1.3. cyphertext
text iwkuhEMQ9Etgs_2vgDH3Xo9SSLGHKN2ajzCT8WhPLBdUWaU2aJjMGICqo-
_e_hniJ30l\ \ZmH2OyDx3q399Z6qiEReY35EUNn-mixHCD9GZrx1eHv-
UJCOHvODkQYdONsBDrEZO45\
\nxgAJ6GncQpF0z5cjwZ_efI_R5xlgPQQD4GxbRr1aE1fEy__ew9mms23k_xBi36wy0V\
\0FT3At6hV3VqpJuNaCMOuUn1FmusdcRHyDdMnbtoryxU3eADGZQLPY87VSzCORMtisj\
\LWJJGJYsixxeRqp_fD2ujYKySQPJutOfoSOTBSghv5aTlhCg5svWZz6f9mSD0EebXDJ\
\kzR2aMBkr6UfW4r9K0VYfBQ437l_uJ5l5NkZ9ZP-k7_oy318KCccO7Ur-o40fFYKm0i\
\AqMXTghwChxGy-nNyl5IZ0ElK3aiG6QZr0_wESQcNf37YLbgBoKVwNdn502_76wSYll\
\zY2s-RckiyE_39aT62Dl6JJbrDJLGtRkSWoLDmmUvCbWq4jAsyJR3WIk7deVZap-h7T\
\fAA0y6s_qRTbzIiKQdzm5jlyjUKIpoLicOB3KWNSbinRAi6ziL5-og1SE01iDZsfVKF\
\lzBAMKrYbzeVBxko_9PucXStC5Q1tZWao75mQVnUl2ZH06hgrJXzjgqkfrilEw46PoV\
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\k9ICPnLiQaPKA_1zKyZwgtcBrBaA2skKTblYeWOreK9q4mXJgFvsWop2MAHyzcegt_D\
\rkUVqLV4yiK7-shBG1yfe_hJb-SOaCBiNKm3K_XJEiSTO4g6-Pc0mEmSg0ZffE17Rqd\
\Kr2YjHA7Ct8BAWdtq5SWA8Lehhp0XpJnpb2pJg088LCkf6JMd9VD9G5JmIO5_9siLQ2\
\K70ty5dhaDwZynbsMIzHUXaEqaSBkwMSq1Awo_5Ed410DVuQB2QCmrduWMCvJ8inIQ9\
\JpvZvtrFghHhhwPXj20y3URNxjAx-BmcpJZkk4-no40OnaDYnO8s-PaPX-mjBUzKF6Z\
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\CdumrdJzkwkvd47EteCXUr9Ko_FYMIDdKB-sH33tO3jlg7tJiwFQTZcNo7DW20R4Ixp\
\5Au6M1AwQ63Nyiu2nIQPaQTo9TKgUo0FJBKw5BFAwPQnBxeVwhiy49t_7-rxEsHtZj-\
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\Do2HH9hpSnnLhyBIAI5LA7qSA2qRTh5Voem4wLvsG4j1_akJGyATXBcJaQZsSWMT_pQ\
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\H5I1rK0bwlxaM
4.1.4. secret
text gl1XhlnH6KJDONLbOLrPCiOj962g48Sk-W67hoSBRTo
5. IANA Considerations
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5.1. JSON Web Key Lattice Registry
This specification establishes the IANA "JSON Web Key Lattice"
registry for values of the JWK "lat" (algorithm) parameters.
This section establishes the IANA "JSON Web Key Lattice" registry for
JWK "lat" member values. The registry records the lattice name,
implementation requirements, and a reference to the specification
that defines it. This specification registers the parameter names
defined in Section 2.1.2.
The implementation requirements of a lattice may be changed over time
as the cryptographic landscape evolves, for instance, to change the
status of a lattice to Deprecated or to change the status of a
lattice from Optional to Recommended+ or Required. Changes of
implementation requirements are only permitted on a Specification
Required basis after review by the Designated Experts, with the new
specification defining the revised implementation requirements level.
5.1.1. Registration Template
Lattice Name: The name requested (e.g., "Kyber-768"). Because a
core goal of this specification is for the resulting
representations to be compact, it is RECOMMENDED that the name be
short -- not to exceed 8 characters without a compelling reason to
do so. This name is case sensitive. Names may not match other
registered names in a case-insensitive manner unless the
Designated Experts state that there is a compelling reason to
allow an exception.
Lattice Description: Brief description of the lattice (e.g.,
"Kyber-768 Lattice").
JOSE Implementation Requirements: The lattice implementation
requirements for JWS and JWE, which must be one the words
Required, Recommended, Optional, Deprecated, or Prohibited.
Optionally, the word can be followed by a "+" or "-". The use of
"+" indicates that the requirement strength is likely to be
increased in a future version of the specification. The use of
"-" indicates that the requirement strength is likely to be
decreased in a future version of the specification.
Change Controller: For Standards Track RFCs, list "IESG". For
others, give the name of the responsible party. Other details
(e.g., postal address, email address, home page URI) may also be
included.
Specification Document(s): Reference to the document or documents
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that specify the parameter, preferably including URIs that can be
used to retrieve copies of the documents. An indication of the
relevant sections may also be included but is not required.
5.1.2. Initial Registry Contents
Kyber-768
* Lattice Name: Kyber-768
* Value: TBD (16 requested)
* Key Type: OKP
* Lattice Description: TODO
* JOSE Implementation Requirements: Optional
* Change Controller: IESG
* Specification Document(s): Section 2.1.2
* Recommended: Yes
6. References
6.1. Normative References
[RFC2119] Bradner, S., "Key words for use in RFCs to Indicate
Requirement Levels", BCP 14, RFC 2119,
DOI 10.17487/RFC2119, March 1997,
<https://www.rfc-editor.org/rfc/rfc2119>.
[RFC7515] Jones, M., Bradley, J., and N. Sakimura, "JSON Web
Signature (JWS)", RFC 7515, DOI 10.17487/RFC7515, May
2015, <https://www.rfc-editor.org/rfc/rfc7515>.
[RFC8174] Leiba, B., "Ambiguity of Uppercase vs Lowercase in RFC
2119 Key Words", BCP 14, RFC 8174, DOI 10.17487/RFC8174,
May 2017, <https://www.rfc-editor.org/rfc/rfc8174>.
6.2. Informative References
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[I-D.draft-cfrg-schwabe-kyber]
Schwabe, P. and B. Westerbaan, "Kyber Post-Quantum KEM",
Work in Progress, Internet-Draft, draft-cfrg-schwabe-
kyber-01, 23 September 2022,
<https://datatracker.ietf.org/doc/html/draft-cfrg-schwabe-
kyber-01>.
Acknowledgments
TODO acknowledge.
Author's Address
Orie Steele
Transmute
Email: orie@transmute.industries
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