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Use of GOST 2012 Signature Algorithms in DNSKEY and RRSIG Resource Records for DNSSEC
draft-ietf-dnsop-rfc5933-bis-10

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This is an older version of an Internet-Draft whose latest revision state is "Replaced".
Authors Dmitry Belyavsky , Vasily Dolmatov , Boris Makarenko
Last updated 2022-10-19 (Latest revision 2022-10-06)
Replaces draft-belyavskiy-rfc5933-bis, draft-dnsop-rfc5933-bis
Replaced by draft-makarenko-gost2012-dnssec
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Send notices to tjw.ietf@gmail.com
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draft-ietf-dnsop-rfc5933-bis-10
Network Working Group                                      D. Belyavskiy
Internet-Draft                                                    TCINET
Obsoletes: 5933 (if approved)                           V. Dolmatov, Ed.
Updates: 8624 (if approved)                         JSC "NPK Kryptonite"
Intended status: Informational                         B. Makarenko, Ed.
Expires: 9 April 2023              The Technical center of Internet, LLC
                                                          6 October 2022

   Use of GOST 2012 Signature Algorithms in DNSKEY and RRSIG Resource
                           Records for DNSSEC
                    draft-ietf-dnsop-rfc5933-bis-10

Abstract

   This document describes how to produce digital signatures and hash
   functions using the GOST R 34.10-2012 and GOST R 34.11-2012
   algorithms for DNSKEY, RRSIG, and DS resource records, for use in the
   Domain Name System Security Extensions (DNSSEC).

   This document obsoletes RFC 5933 and updates RFC 8624.

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
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   This Internet-Draft will expire on 9 April 2023.

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

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   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
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  DNSKEY Resource Records . . . . . . . . . . . . . . . . . . .   3
     2.1.  Using a Public Key with Existing Cryptographic
           Libraries . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.2.  GOST DNSKEY RR Example  . . . . . . . . . . . . . . . . .   4
   3.  RRSIG Resource Records  . . . . . . . . . . . . . . . . . . .   5
     3.1.  RRSIG RR Example  . . . . . . . . . . . . . . . . . . . .   5
   4.  DS Resource Records . . . . . . . . . . . . . . . . . . . . .   6
     4.1.  DS RR Example . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Operational Considerations  . . . . . . . . . . . . . . . . .   6
     5.1.  Key Sizes . . . . . . . . . . . . . . . . . . . . . . . .   6
     5.2.  Signature Sizes . . . . . . . . . . . . . . . . . . . . .   6
     5.3.  Digest Sizes  . . . . . . . . . . . . . . . . . . . . . .   6
   6.  Implementation Considerations . . . . . . . . . . . . . . . .   6
   7.  Changes to RFC 5933 . . . . . . . . . . . . . . . . . . . . .   7
   8.  Update to RFC 8624  . . . . . . . . . . . . . . . . . . . . .   7
   9.  Security Considerations . . . . . . . . . . . . . . . . . . .   7
   10. IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   11. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .   8
   12. References  . . . . . . . . . . . . . . . . . . . . . . . . .   8
     12.1.  Normative References . . . . . . . . . . . . . . . . . .   8
     12.2.  Informative References . . . . . . . . . . . . . . . . .  10
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   The Domain Name System (DNS) is the global hierarchical distributed
   database for Internet Naming.  The DNS has been extended to use
   cryptographic keys and digital signatures for the verification of the
   authenticity and integrity of its data.  RFC 4033 [RFC4033], RFC 4034
   [RFC4034], and RFC 4035 [RFC4035] describe these DNS Security
   Extensions, called DNSSEC.

   RFC 4034 describes how to store DNSKEY and RRSIG resource records,
   and specifies a list of cryptographic algorithms to use.  This
   document extends that list with the signature and hash algorithms
   GOST R 34.10-2012 ([RFC7091]) and GOST R 34.11-2012 ([RFC6986]), and
   specifies how to store DNSKEY data and how to produce RRSIG resource
   records with these algorithms.

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   This document obsoletes RFC5933 [RFC5933].  This document also marks
   the DNS Security Algorithm GOST R 34.10-2001 as obsolete.

   Familiarity with DNSSEC and with GOST signature and hash algorithms
   is assumed in this document.

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.

2.  DNSKEY Resource Records

   The format of the DNSKEY RR can be found in RFC 4034 [RFC4034].

   GOST R 34.10-2012 public keys are stored with the algorithm number
   TBA1.

   According to RFC 7091 [RFC7091], a public key is a point on the
   elliptic curve Q = (x,y).  The wire representation of a public key
   MUST contain 64 octets, where the first 32 octets contain the little-
   endian representation of x and the second 32 octets contain the
   little-endian representation of y.

   As RFC 6986 and RFC 7091 allows 2 variants of length of the output
   hash and signature and many variants of parameters of the digital
   signature, for the purpose of this document we use 256-bit variant of
   the digital signature algorithm, corresponding 256-bit variant of the
   digest algorithm.  We select the parameters for the digital signature
   algorithm to be id-tc26-gost-3410-2012-256-paramSetA in RFC 7836
   [RFC7836].

2.1.  Using a Public Key with Existing Cryptographic Libraries

   At the time of this writing, existing GOST-aware cryptographic
   libraries are capable of reading GOST public keys via a generic X509
   API if the key is encoded according to RFC 7091 [RFC7091],
   Section 2.3.2.

   To make this encoding from the wire format of a GOST public key with
   the parameters used in this document, prepend the 64 octets of key
   data with the following 32-byte sequence:

      0x30 0x5e 0x30 0x17 0x06 0x08 0x2a 0x85 0x03 0x07 0x01 0x01 0x01

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      0x01 0x30 0x0b 0x06 0x09 0x2a 0x85 0x03 0x07 0x01 0x02 0x01 0x01
      0x01 0x03 0x43 0x00 0x04 0x40

   These bytes provide the following ASN.1 structure suitable for
   parsing by cryptographic toolkits:

     0  62: SEQUENCE {
     2   1:   INTEGER 0
     5  23:   SEQUENCE {
     7   8:     OBJECT IDENTIFIER '1 2 643 7 1 1 1 1'
    17  11:     SEQUENCE {
    19   9:       OBJECT IDENTIFIER '1 2 643 7 1 2 1 1 1'
          :       }
          :     }
    30  32:   OCTET STRING

   The OIDs in the structure above represent GOsudarstvennyy STandart
   (GOST) R 34.10-2012 public keys with 256 bits private key length
   algorithm with Parameter set A for Keyed-Hash Message Authentication
   Code (HMAC) transformation based on the GOsudarstvennyy STandart
   (GOST) R 34.11-2012 hash function with 256-bit output according to
   RFC 7836 [RFC7836] and RFC 9125 [RFC9125].

2.2.  GOST DNSKEY RR Example

   Given a private key with the following value (the value of the
   Gost12Asn1 field is split here into two lines to simplify reading; in
   the private key file, it must be in one line):

   Private-key-format: v1.2
   Algorithm: 23 (ECC-GOST12)
   Gost12Asn1: MD4CAQAwFwYIKoUDBwEBAQEwCwYJKoUDBwECAQEBBCD/
               Mw9o6R5lQHJ13jz0W+C1tdsS4W7RJn04rk9MGJq3Hg==

   The following DNSKEY RR stores a DNS zone key for example:

   example.  600  IN  DNSKEY  256 3 23 (
               XGiiHlKUJd5fSeAK5O3L4tUNCPxs4pGqum6wKbqjdkqu
               IQ8nOXrilXZ9HcY8b2AETkWrtWHfwvJD4twPPJFQSA==
       ) ;{id = 47355 (zsk), size = 512b}

   Public key can be calculated from the private key using algorithm
   described in RFC 7091 [RFC7091].

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3.  RRSIG Resource Records

   The value of the signature field in the RRSIG RR follows RFC 7091
   [RFC7091] and is calculated as follows.  The values for the RDATA
   fields that precede the signature data are specified in RFC 4034
   [RFC4034].

   hash = GOSTR3411-2012(data)

   where "data" is the wire format data of the resource record set that
   is signed, as specified in RFC 4034 [RFC4034].

   The signature is calculated from the hash according to the GOST R
   34.10-2012 standard, and its wire format is compatible with RFC 7091
   [RFC7091].

3.1.  RRSIG RR Example

   With the private key from this document, consisting of one MX record:

      example.  600 IN MX 10 mail.example.

   Setting the inception date to 2022-10-06 12:32:30 UTC and the
   expiration date to 2022-11-03 12:32:30 UTC, the following signature
   RR will be valid:

   example.  600 IN  RRSIG MX 23 1 600 20221103123230 (
                          20221006123230 47355 example.
                          EuLO0Qpn6zT1pzj9T2H5AWjcgzfmjNiK/vj811bExa0V
                          HMOVD9ma8rpf0B+D+V4Q0CWu1Ayzu+H/SyndnOWGxw==
   )

   The ECC-GOST12 signature algorithm uses random (pseudorandom) integer
   k as descibed in Section 6.1 of RFC 7091 [RFC7091].  The following
   constant was used to replace k to provide a reproducible signature
   example.

   k = 8BBD0CE7CAF3FC1C2503DF30D13ED5DB75EEC44060FA22FB7E29628407C1E34

   This constant MUST NOT be used when computing ECC-GOST12 signatures.
   It is provided only so the above signature example can be reproduced.
   The actual computed signature value will differ between signature
   calculations.

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4.  DS Resource Records

   The GOST R 34.11-2012 digest algorithm is denoted in DS RRs by the
   digest type TBA2.  The wire format of a digest value is compatible
   with RFC 6986 [RFC6986].

4.1.  DS RR Example

   For Key Signing Key (KSK):

   example.  IN  DNSKEY  257 3 23 (
                          p8Req8DLJOfPymO5vExuK4gCcihF5N1YL7veCJ47av+w
                          h/qs9yJpD064k02rYUHfWnr7IjvJlbn3Z0sTZe9GRQ==
                          ) ;{id = 29468 (ksk), size = 512b}

   The DS RR will be:

   example.  IN  DS  29468 23 5 (
                         6033725b0ccfc05d1e9d844d49c6cf89
                         0b13d5eac9439189947d5db6c8d1c1ec
                         )

   Note: Algorithm number 23 is used here as an example, since the
   actual number has not yet been assigned.

5.  Operational Considerations

5.1.  Key Sizes

   The key size of GOST public keys conforming to this specification
   MUST be 512 bits according to RFC 7091 [RFC7091].

5.2.  Signature Sizes

   The size of a GOST signature conforming to this specification MUST be
   512 bits according to RFC 7091 [RFC7091].

5.3.  Digest Sizes

   The size of a GOST digest conforming to this specification MUST be
   256 bits according to RFC 6986 [RFC6986].

6.  Implementation Considerations

   The support of this cryptographic suite in DNSSEC-aware systems is
   OPTIONAL.  According to RFC6840 [RFC6840], Section 5.2 systems that
   do not support these algorithms may ignore the RRSIG, DNSKEY and DS
   records created with them.

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   (To be removed in RFC).  To check the correctness of the
   implementation, authors recommend using OpenSSL 1.1.1 or 3.0.x
   series, a fork of ldns available at https://github.com/beldmit/ldns,
   and a reference implementation of GOST crypto algorithms available at
   https://github.com/gost-engine/engine.

7.  Changes to RFC 5933

   This document specifies the usage of the signature algorithm GOST R
   34.10-2012 and hash algorithm GOST R 34.11-2012 instead of the
   signature algorithm GOST R 34.10-2001 and hash algorithm GOST R
   34.11-94, specified in RFC 5933.

   As GOST R 34.10-2001 and GOST R 34.11-94 are not used in production
   deployments, these deprecated algorithms MUST NOT be implemented or
   used for DNSSEC signing or DNSSEC validation.

8.  Update to RFC 8624

   This document updates RFC8624 [RFC8624].  The paragraph describing
   the state of GOST algorithms in section 3.1 of RFC 8624 currently
   says:

   ECC-GOST (GOST R 34.10-2001) has been superseded by GOST R 34.10-2012
   in [RFC7091].  GOST R 34.10-2012 hasn't been standardized for use in
   DNSSEC.

   That paragraph is now replaced with the following:

   ECC-GOST (GOST R 34.10-2001) has been superseded by GOST R 34.10-2012
   in [RFC7091].  GOST R 34.10-2012 has been standardized for use in
   DNSSEC in RFC TBC.

9.  Security Considerations

   It is recommended to use a dual KSK algorithm signed zone until GOST-
   aware DNSSEC software become more widespread, unless GOST-only
   cryptography is needed.  Otherwise, GOST-signed zones may be
   considered unsigned by the DNSSEC software currently in use.

   Currently, the cryptographic resistance of the GOST R 34.10-2012
   digital signature algorithm is estimated as 2**128 operations of
   multiple elliptic curve point computations on prime modulus of order
   2**256.

   Currently, the cryptographic collision resistance of the GOST R
   34.11-2012 hash algorithm is estimated as 2**128 operations of
   computations of a step hash function.

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10.  IANA Considerations

   This document updates the IANA registry "DNS Security Algorithm
   Numbers".  The following entries have been added to the registry:

                                       Zone    Trans.
   Value  Algorithm         Mnemonic  Signing Sec.  References
   TBA1   GOST R 34.10-2012 ECC-GOST12    Y   *     RFC TBA

   The entry for the Algorithm "GOST R 34.10-2001", number 12 should be
   updated as such: Description field should be changed to "GOST R
   34.10-2001 (deprecated, see TBA1" and Zone Signing field should be
   changed to "N".

   This document updates the RFC IANA registry "Delegation Signer (DS)
   Resource Record (RR) Type Digest Algorithms" by adding an entry for
   the GOST R 34.11-2012 algorithm:

      Value   Algorithm
      TBA2    GOST R 34.11-2012

   The entry for Value 3, GOST R 34.11-94 should be updated to have its
   Status changed to '-'.

   This paragraph shoud be removed before the publication of RFC: For
   the purpose of example computations, the following values were used:
   TBA1 = 23, TBA2 = 5.

11.  Acknowledgments

   This document is a minor extension to RFC 4034 [RFC4034].  Also, we
   tried to follow the documents RFC 3110 [RFC3110], RFC 4509 [RFC4509],
   and RFC 5933 [RFC5933] for consistency.  The authors of and
   contributors to these documents are gratefully acknowledged for their
   hard work.

   The following people provided additional feedback, text, and valuable
   assistance: Alexander Venedyukhin, Michael StJohns, Valery Smyslov,
   Tim Wicinski, Stephane Bortzmeyer.

12.  References

12.1.  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/info/rfc2119>.

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   [RFC3110]  Eastlake 3rd, D., "RSA/SHA-1 SIGs and RSA KEYs in the
              Domain Name System (DNS)", RFC 3110, DOI 10.17487/RFC3110,
              May 2001, <https://www.rfc-editor.org/info/rfc3110>.

   [RFC4033]  Arends, R., Austein, R., Larson, M., Massey, D., and S.
              Rose, "DNS Security Introduction and Requirements",
              RFC 4033, DOI 10.17487/RFC4033, March 2005,
              <https://www.rfc-editor.org/info/rfc4033>.

   [RFC4034]  Arends, R., Austein, R., Larson, M., Massey, D., and S.
              Rose, "Resource Records for the DNS Security Extensions",
              RFC 4034, DOI 10.17487/RFC4034, March 2005,
              <https://www.rfc-editor.org/info/rfc4034>.

   [RFC4035]  Arends, R., Austein, R., Larson, M., Massey, D., and S.
              Rose, "Protocol Modifications for the DNS Security
              Extensions", RFC 4035, DOI 10.17487/RFC4035, March 2005,
              <https://www.rfc-editor.org/info/rfc4035>.

   [RFC6840]  Weiler, S., Ed. and D. Blacka, Ed., "Clarifications and
              Implementation Notes for DNS Security (DNSSEC)", RFC 6840,
              DOI 10.17487/RFC6840, February 2013,
              <https://www.rfc-editor.org/info/rfc6840>.

   [RFC6986]  Dolmatov, V., Ed. and A. Degtyarev, "GOST R 34.11-2012:
              Hash Function", RFC 6986, DOI 10.17487/RFC6986, August
              2013, <https://www.rfc-editor.org/info/rfc6986>.

   [RFC7091]  Dolmatov, V., Ed. and A. Degtyarev, "GOST R 34.10-2012:
              Digital Signature Algorithm", RFC 7091,
              DOI 10.17487/RFC7091, December 2013,
              <https://www.rfc-editor.org/info/rfc7091>.

   [RFC7836]  Smyshlyaev, S., Ed., Alekseev, E., Oshkin, I., Popov, V.,
              Leontiev, S., Podobaev, V., and D. Belyavsky, "Guidelines
              on the Cryptographic Algorithms to Accompany the Usage of
              Standards GOST R 34.10-2012 and GOST R 34.11-2012",
              RFC 7836, DOI 10.17487/RFC7836, March 2016,
              <https://www.rfc-editor.org/info/rfc7836>.

   [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/info/rfc8174>.

   [RFC8624]  Wouters, P. and O. Sury, "Algorithm Implementation
              Requirements and Usage Guidance for DNSSEC", RFC 8624,
              DOI 10.17487/RFC8624, June 2019,
              <https://www.rfc-editor.org/info/rfc8624>.

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12.2.  Informative References

   [RFC4509]  Hardaker, W., "Use of SHA-256 in DNSSEC Delegation Signer
              (DS) Resource Records (RRs)", RFC 4509,
              DOI 10.17487/RFC4509, May 2006,
              <https://www.rfc-editor.org/info/rfc4509>.

   [RFC5933]  Dolmatov, V., Ed., Chuprina, A., and I. Ustinov, "Use of
              GOST Signature Algorithms in DNSKEY and RRSIG Resource
              Records for DNSSEC", RFC 5933, DOI 10.17487/RFC5933, July
              2010, <https://www.rfc-editor.org/info/rfc5933>.

   [RFC9125]  Farrel, A., Drake, J., Rosen, E., Patel, K., and L. Jalil,
              "Gateway Auto-Discovery and Route Advertisement for Site
              Interconnection Using Segment Routing", RFC 9125,
              DOI 10.17487/RFC9125, August 2021,
              <https://www.rfc-editor.org/info/rfc9125>.

Authors' Addresses

   Dmitry Belyavskiy
   TCINET
   8 marta st
   Moscow
   Russian Federation
   Phone: +7 916 262 5593
   Email: beldmit@gmail.com

   Vasily Dolmatov (editor)
   JSC "NPK Kryptonite"
   Spartakovskaya sq., 14, bld 2, JSC "NPK Kryptonite"
   Moscow
   105082
   Russian Federation
   Email: vdolmatov@gmail.com

   Boris Makarenko (editor)
   The Technical center of Internet, LLC
   8 marta str., 1, bld 12
   Moscow
   127083
   Russian Federation
   Email: bmakarenko@tcinet.ru

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