draft-ietf-cbor-date-tag-00.txt   draft-ietf-cbor-date-tag-01.txt 
CBOR Working Group M. Jones CBOR Working Group M. Jones
Internet-Draft A. Nadalin Internet-Draft A. Nadalin
Intended status: Standards Track Microsoft Intended status: Standards Track Microsoft
Expires: November 8, 2020 J. Richter Expires: December 11, 2020 J. Richter
pdv Financial Software GmbH pdv Financial Software GmbH
May 7, 2020 June 9, 2020
Concise Binary Object Representation (CBOR) Tags for Date Concise Binary Object Representation (CBOR) Tags for Date
draft-ietf-cbor-date-tag-00 draft-ietf-cbor-date-tag-01
Abstract Abstract
The Concise Binary Object Representation (CBOR, RFC 7049) is a data The Concise Binary Object Representation (CBOR, RFC 7049) is a data
format whose design goals include the possibility of extremely small format whose design goals include the possibility of extremely small
code size, fairly small message size, and extensibility without the code size, fairly small message size, and extensibility without the
need for version negotiation. need for version negotiation.
In CBOR, one point of extensibility is the definition of CBOR tags. In CBOR, one point of extensibility is the definition of CBOR tags.
RFC 7049 defines two tags for time: CBOR tag 0 (RFC 3339 date/time RFC 7049 defines two tags for time: CBOR tag 0 (RFC 3339 date/time
string) and tag 1 (Posix "seconds since the epoch"). Since then, string) and tag 1 (Posix "seconds since the epoch"). Since then,
additional requirements have become known. This specification additional requirements have become known. This specification
defines a CBOR tag for an RFC 3339 date text string, for applications defines a CBOR tag for an RFC 3339 date text string, for applications
needing a textual date representation without a time. It also needing a textual date representation without a time. It also
defines a CBOR tag for days since the Posix epoch, for applicaitons defines a CBOR tag for days since the Posix epoch, for applications
needing a numeric date representation without a time. It is intended needing a numeric date representation without a time. It is intended
as the reference document for the IANA registration of the CBOR tags as the reference document for the IANA registration of the CBOR tags
defined. defined.
Status of This Memo Status of This Memo
This Internet-Draft is submitted in full conformance with the This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF). Note that other groups may also distribute Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet- working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/. Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
This Internet-Draft will expire on November 8, 2020. This Internet-Draft will expire on December 11, 2020.
Copyright Notice Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of (https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
skipping to change at page 2, line 33 skipping to change at page 2, line 33
1.1. Requirements Notation and Conventions . . . . . . . . . . 3 1.1. Requirements Notation and Conventions . . . . . . . . . . 3
2. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3 2. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
2.1. Concise Binary Object Representation (CBOR) Tags 2.1. Concise Binary Object Representation (CBOR) Tags
Registrations . . . . . . . . . . . . . . . . . . . . . . 3 Registrations . . . . . . . . . . . . . . . . . . . . . . 3
3. Security Considerations . . . . . . . . . . . . . . . . . . . 3 3. Security Considerations . . . . . . . . . . . . . . . . . . . 3
4. References . . . . . . . . . . . . . . . . . . . . . . . . . 3 4. References . . . . . . . . . . . . . . . . . . . . . . . . . 3
4.1. Normative References . . . . . . . . . . . . . . . . . . 3 4.1. Normative References . . . . . . . . . . . . . . . . . . 3
4.2. Informative References . . . . . . . . . . . . . . . . . 4 4.2. Informative References . . . . . . . . . . . . . . . . . 4
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 4 Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 4
Document History . . . . . . . . . . . . . . . . . . . . . . . . 4 Document History . . . . . . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 4 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction 1. Introduction
The Concise Binary Object Representation (CBOR) [RFC7049] provides The Concise Binary Object Representation (CBOR) [RFC7049] provides
for the interchange of structured data without a requirement for a for the interchange of structured data without a requirement for a
pre-agreed schema. RFC 7049 defines a basic set of data types, as pre-agreed schema. RFC 7049 defines a basic set of data types, as
well as a tagging mechanism that enables extending the set of data well as a tagging mechanism that enables extending the set of data
types supported via an IANA registry. types supported via an IANA registry.
This specification defines a CBOR tag for a text string representing This specification defines a CBOR tag for a text string representing
a date but not a time. The tagged text string is represented as a date but not a time. The tagged text string is represented as
specified by the RFC 3339 [RFC3339] "full-date" production. specified by the RFC 3339 [RFC3339] "full-date" production.
This specification also defines a CBOR tag for an integer This specification also defines a CBOR tag for an integer
representing a date but not a time. The tagged integer is a positive representing a date but not a time. The tagged integer is an
or negative value indicating the number of days since the IEEE Std unsigned or negative value indicating the number of days since the
1003.1, 2013 Edition [POSIX.1] epoch date 1970-01-01. IEEE Std 1003.1, 2013 Edition [POSIX.1] epoch date 1970-01-01. As an
implementation note, this value has a constant offset from the
Modified Julian Date value (which is defined by the Smithsonian
Astrophysical Observatory as the number of days since November 17,
1858); this value is the Modified Julian Date minus 40,587.
1.1. Requirements Notation and Conventions 1.1. Requirements Notation and Conventions
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
"OPTIONAL" in this document are to be interpreted as described in BCP "OPTIONAL" in this document are to be interpreted as described in BCP
14 [RFC2119] [RFC8174] when, and only when, they appear in all 14 [RFC2119] [RFC8174] when, and only when, they appear in all
capitals, as shown here. capitals, as shown here.
2. IANA Considerations 2. IANA Considerations
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This section registers the following values in the IANA "Concise This section registers the following values in the IANA "Concise
Binary Object Representation (CBOR) Tags" registry [IANA.cbor-tags]. Binary Object Representation (CBOR) Tags" registry [IANA.cbor-tags].
o Tag: 1004 (value requested) o Tag: 1004 (value requested)
o Data Item: UTF-8 text string o Data Item: UTF-8 text string
o Semantics: RFC 3339 full-date string o Semantics: RFC 3339 full-date string
o Reference: [[ this specification ]] o Reference: [[ this specification ]]
o Tag: 100 (ASCII 'd') (value requested) o Tag: 100 (ASCII 'd') (value requested)
o Data Item: Positive or negative integer o Data Item: Unsigned or negative integer
o Semantics: Number of days since the epoch date 1970-01-01 o Semantics: Number of days since the epoch date 1970-01-01
o Reference: [[ this specification ]] o Reference: [[ this specification ]]
3. Security Considerations 3. Security Considerations
The security considerations of RFC 7049 apply; the tags introduced The security considerations of RFC 7049 apply; the tags introduced
here are not expected to raise security considerations beyond those. here are not expected to raise security considerations beyond those.
A date, of course, has significant security considerations; these A date, of course, has significant security considerations; these
include the exploitation of ambiguities where the date is security include the exploitation of ambiguities where the date is security
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Acknowledgements Acknowledgements
Thanks to Carsten Bormann for supporting creation of this Thanks to Carsten Bormann for supporting creation of this
specification. Parts of the explanatory text in this specification specification. Parts of the explanatory text in this specification
come from draft-bormann-cbor-time-tag-02. come from draft-bormann-cbor-time-tag-02.
Document History Document History
[[ to be removed by the RFC Editor before publication as an RFC ]] [[ to be removed by the RFC Editor before publication as an RFC ]]
-01
o Changed "positive or negative" to "unsigned or negative".
o Added an implementation note about the relationship to Modified
Julian Dates.
-00 -00
o Initial working group version based on draft-jones-cbor-date- o Initial working group version based on draft-jones-cbor-date-
tag-01 with no normative changes. tag-01 with no normative changes.
Authors' Addresses Authors' Addresses
Michael B. Jones Michael B. Jones
Microsoft Microsoft
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