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draft-jones-webauthn-secp256k1.xml
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draft-jones-webauthn-secp256k1.xml
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<?xml version='1.0' encoding='UTF-8'?>
<?xml-stylesheet type='text/xsl' href='http://xml2rfc.tools.ietf.org/authoring/rfc2629.xslt' ?>
<!DOCTYPE rfc SYSTEM "rfc2629.dtd">
<?rfc toc="yes"?>
<?rfc tocompact="yes"?>
<?rfc tocdepth="4"?>
<?rfc tocindent="yes"?>
<?rfc symrefs="yes"?>
<?rfc sortrefs="yes"?>
<?rfc compact="yes"?>
<?rfc subcompact="no"?>
<rfc category="info"
ipr="trust200902"
docName="draft-jones-webauthn-secp256k1-00">
<front>
<title>Using secp256k1 with JOSE and COSE</title>
<author fullname="Michael B. Jones" surname="Jones" initials="M.B.">
<organization>Microsoft</organization>
<address>
<email>[email protected]</email>
<uri>http://self-issued.info/</uri>
</address>
</author>
<date day="30" month="May" year="2018" />
<area>Security</area>
<workgroup>WebAuthn Working Group</workgroup>
<keyword>Cryptography</keyword>
<keyword>Digital Signature</keyword>
<keyword>Encryption</keyword>
<keyword>Internet-Draft</keyword>
<abstract>
<t>
This specification defines algorithm encodings and representations enabling the
Standards for Efficient Cryptography Group (SECG) elliptic curve "secp256k1" to be used for
JSON Object Signing and Encryption (JOSE) and
CBOR Object Signing and Encryption (COSE) messages.
</t>
</abstract>
</front>
<middle>
<section anchor="Introduction" title="Introduction">
<t>
This specification defines algorithm encodings and representations enabling the
Standards for Efficient Cryptography Group (SECG) elliptic curve
"secp256k1" <xref target="SEC2"/> to be used for
JSON Object Signing and Encryption (JOSE) <xref target="RFC7515"/> and
CBOR Object Signing and Encryption (COSE) <xref target="RFC8152"/> messages.
The elliptic curve and associated algorithm are registered in
appropriate IANA JOSE and COSE registries.
</t>
<section anchor="rnc" title="Requirements Notation and Conventions">
<t>
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 <xref target="RFC2119"/> <xref target="RFC8174"/> when, and
only when, they appear in all capitals, as shown here.
</t>
</section>
</section>
<section title="JOSE and COSE secp256k1 Curve Key Representations" anchor="curve">
<t>
The Standards for Efficient Cryptography Group (SECG) elliptic curve
"secp256k1" <xref target="SEC2"/> is represented in
a JSON Web Key (JWK) <xref target="RFC7517"/> using these values:
</t>
<t>
<?rfc subcompact="yes"?>
<list style="symbols">
<t><spanx style="verb">kty</spanx>: <spanx style="verb">EC</spanx></t>
<t><spanx style="verb">crv</spanx>: <spanx style="verb">P-256K</spanx></t>
</list>
<?rfc subcompact="no"?>
</t>
<t>
plus <spanx style="verb">x</spanx> and <spanx style="verb">y</spanx> values
to represent the curve point for the key.
Other optional values such as <spanx style="verb">alg</spanx> MAY also be present.
</t>
<t>
It is represented in a COSE_Key <xref target ="RFC8152"/> using these values:
</t>
<t>
<?rfc subcompact="yes"?>
<list style="symbols">
<t><spanx style="verb">kty</spanx> (1): <spanx style="verb">EC2</spanx> (2)</t>
<t><spanx style="verb">crv</spanx> (-1): <spanx style="verb">P-256K</spanx> (TBD - requested assignment 8)</t>
</list>
<?rfc subcompact="no"?>
</t>
<t>
plus <spanx style="verb">x</spanx> (-2) and <spanx style="verb">y</spanx> (-3) values
to represent the curve point for the key.
Other optional values such as <spanx style="verb">alg</spanx> (3) MAY also be present.
</t>
</section>
<section title="ECDSA Signature with secp256k1 Curve" anchor="ECDSA">
<t>
The ECDSA signature algorithm is defined in <xref target="DSS"/>.
Implementations need to check that the key type is <spanx style="verb">EC</spanx> for JOSE or
<spanx style="verb">EC2</spanx> (2) for COSE when creating or verifying a signature.
</t>
<t>
The ECDSA algorithm specified in this document is:
</t>
<texttable anchor="table-ec-algs" title="ECDSA Algorithm Values" suppress-title="false" align="center" style="full">
<ttcol align="left">JOSE Alg Name</ttcol>
<ttcol align="left">COSE Alg Value</ttcol>
<ttcol align="left">Description</ttcol>
<c>ES256K</c>
<c>TBD (requested assignment -43)</c>
<c>ECDSA w/ secp256k1 Curve</c>
</texttable>
</section>
<section anchor="IANA" title="IANA Considerations">
<section anchor="jose-curve-registration" title="JSON Web Key Elliptic Curve Registration">
<t>
This section registers the following value in the
IANA "JSON Web Key Elliptic Curve" registry <xref target="IANA.JOSE.Curves"/>.
</t>
<t>
<?rfc subcompact="yes"?>
<list style='symbols'>
<t>
Curve Name: P-256K
</t>
<t>
Curve Description: SECG secp256k1 Curve
</t>
<t>
JOSE Implementation Requirements: Optional
</t>
<t>
Change Controller: IESG
</t>
<t>
Specification Document(s): <xref target="curve"/> of [[ this specification ]]
</t>
</list>
</t>
<?rfc subcompact="no"?>
</section>
<section anchor="jose-algorithm-registration" title="JOSE Algorithm Registration">
<t>
This section registers the following value in the
IANA "JSON Web Signature and Encryption Algorithms" registry <xref target="IANA.JOSE.Algorithms"/>.
</t>
<t>
<?rfc subcompact="yes"?>
<list style='symbols'>
<t>
Algorithm Name: ES256K
</t>
<t>
Algorithm Description: ECDSA w/ secp256k1 Curve
</t>
<t>
Algorithm Usage Locations: alg
</t>
<t>
JOSE Implementation Requirements: Optional
</t>
<t>
Change Controller: IESG
</t>
<t>
Reference: <xref target="ECDSA"/> of [[ this specification ]]
</t>
<t>
Algorithm Analysis Document(s): <xref target="SEC2"/>
</t>
</list>
</t>
<?rfc subcompact="no"?>
</section>
<section anchor="cose-curve-registration" title="COSE Elliptic Curves Registration">
<t>
This section registers the following value in the
IANA "COSE Elliptic Curves" registry <xref target="IANA.COSE.Curves"/>.
</t>
<t>
<?rfc subcompact="yes"?>
<list style='symbols'>
<t>
Name: P-256K
</t>
<t>
Value: TBD (requested assignment 8)
</t>
<t>
Key Type: EC2
</t>
<t>
Description: SECG secp256k1 Curve
</t>
<t>
Change Controller: IESG
</t>
<t>
Reference: <xref target="curve"/> of [[ this specification ]]
</t>
<t>
Recommended: Yes
</t>
</list>
</t>
<?rfc subcompact="no"?>
</section>
<section anchor="cose-algorithm-registration" title="COSE Algorithm Registration">
<t>
This section registers the following value in the
IANA "COSE Algorithms" registry <xref target="IANA.COSE.Algorithms"/>.
</t>
<t>
<?rfc subcompact="yes"?>
<list style='symbols'>
<t>
Name: ES256K
</t>
<t>
Value: TBD (requested assignment -43)
</t>
<t>
Description: ECDSA w/ secp256k1 Curve
</t>
<t>
Reference: <xref target="ECDSA"/> of this document
</t>
<t>
Recommended: Yes
</t>
</list>
</t>
<?rfc subcompact="no"?>
</section>
</section>
<section anchor="Security" title="Security Considerations">
<t>
Care should be taken that a secp256k1 key not be mistaken for a P-256 key,
given that their representations are the same
except for the <spanx style="verb">crv</spanx> value.
</t>
<t>
The procedures and security considerations described in the
<xref target="SEC1"/>, <xref target="SEC2"/>, and <xref target="DSS"/>
specifications apply to implementations of this specification.
</t>
</section>
</middle>
<back>
<references title="Normative References">
<?rfc include="reference.RFC.2119.xml"?>
<?rfc include="reference.RFC.7515.xml"?>
<?rfc include="reference.RFC.7517.xml"?>
<?rfc include="reference.RFC.8152.xml"?>
<?rfc include="reference.RFC.8174.xml"?>
<reference anchor="DSS" target="http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.186-4.pdf">
<front>
<title>Digital Signature Standard (DSS)</title>
<author>
<organization>National Institute of Standards and
Technology (NIST)</organization>
</author>
<date month="July" year="2013" />
</front>
<seriesInfo name="FIPS" value="PUB 186-4" />
</reference>
<reference anchor="SEC1" target="http://www.secg.org/sec1-v2.pdf">
<front>
<title>SEC 1: Elliptic Curve Cryptography</title>
<author>
<organization>Standards for Efficient Cryptography Group</organization>
</author>
<date day="21" month="May" year="2009" />
</front>
<seriesInfo name="Version" value="2.0" />
</reference>
<reference anchor="SEC2" target="http://www.secg.org/sec2-v2.pdf">
<front>
<title>SEC 2: Recommended Elliptic Curve Domain Parameters</title>
<author>
<organization>Standards for Efficient Cryptography Group</organization>
</author>
<date day="27" month="January" year="2010" />
</front>
<seriesInfo name="Version" value="2.0" />
</reference>
</references>
<references title="Informative References">
<reference anchor="IANA.JOSE.Algorithms" target="https://www.iana.org/assignments/jose/jose.xhtml#web-signature-encryption-algorithms">
<front>
<title>JSON Web Signature and Encryption Algorithms</title>
<author>
<organization>IANA</organization>
</author>
<date/>
</front>
</reference>
<reference anchor="IANA.JOSE.Curves" target="https://www.iana.org/assignments/jose/jose.xhtml#web-key-elliptic-curve">
<front>
<title>JSON Web Key Elliptic Curve</title>
<author>
<organization>IANA</organization>
</author>
<date/>
</front>
</reference>
<reference anchor="IANA.COSE.Algorithms" target="https://www.iana.org/assignments/cose/cose.xhtml#algorithms">
<front>
<title>COSE Algorithms</title>
<author>
<organization>IANA</organization>
</author>
<date/>
</front>
</reference>
<reference anchor="IANA.COSE.Curves" target="https://www.iana.org/assignments/cose/cose.xhtml#elliptic-curves">
<front>
<title>COSE Elliptic Curves</title>
<author>
<organization>IANA</organization>
</author>
<date/>
</front>
</reference>
</references>
<section title="Acknowledgements" anchor="Acknowledgements" numbered="no">
<t>
TBD
</t>
</section>
<section title="Document History" anchor="History">
<t>
[[ to be removed by the RFC Editor before publication as an RFC ]]
</t>
<t>
-00
<list style='symbols'>
<t>
Initial version.
</t>
</list>
</t>
</section>
</back>
</rfc>