Concise Binary Object Representation (CBOR) Tags for Date
draft-ietf-cbor-date-tag-01
The information below is for an old version of the document.
| Document | Type | Active Internet-Draft (cbor WG) | |
|---|---|---|---|
| Authors | Michael Jones , Anthony Nadalin , Joerg Richter | ||
| Last updated | 2020-06-30 (Latest revision 2020-06-09) | ||
| Replaces | draft-jones-cbor-date-tag | ||
| Stream | Internet Engineering Task Force (IETF) | ||
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draft-ietf-cbor-date-tag-01
CBOR Working Group M. Jones
Internet-Draft A. Nadalin
Intended status: Standards Track Microsoft
Expires: December 11, 2020 J. Richter
pdv Financial Software GmbH
June 9, 2020
Concise Binary Object Representation (CBOR) Tags for Date
draft-ietf-cbor-date-tag-01
Abstract
The Concise Binary Object Representation (CBOR, RFC 7049) is a data
format whose design goals include the possibility of extremely small
code size, fairly small message size, and extensibility without the
need for version negotiation.
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
string) and tag 1 (Posix "seconds since the epoch"). Since then,
additional requirements have become known. This specification
defines a CBOR tag for an RFC 3339 date text string, for applications
needing a textual date representation without a time. It also
defines a CBOR tag for days since the Posix epoch, for applications
needing a numeric date representation without a time. It is intended
as the reference document for the IANA registration of the CBOR tags
defined.
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 December 11, 2020.
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Copyright Notice
Copyright (c) 2020 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
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described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Requirements Notation and Conventions . . . . . . . . . . 3
2. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 3
2.1. Concise Binary Object Representation (CBOR) Tags
Registrations . . . . . . . . . . . . . . . . . . . . . . 3
3. Security Considerations . . . . . . . . . . . . . . . . . . . 3
4. References . . . . . . . . . . . . . . . . . . . . . . . . . 3
4.1. Normative References . . . . . . . . . . . . . . . . . . 3
4.2. Informative References . . . . . . . . . . . . . . . . . 4
Acknowledgements . . . . . . . . . . . . . . . . . . . . . . . . 4
Document History . . . . . . . . . . . . . . . . . . . . . . . . 4
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 5
1. Introduction
The Concise Binary Object Representation (CBOR) [RFC7049] provides
for the interchange of structured data without a requirement for a
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
types supported via an IANA registry.
This specification defines a CBOR tag for a text string representing
a date but not a time. The tagged text string is represented as
specified by the RFC 3339 [RFC3339] "full-date" production.
This specification also defines a CBOR tag for an integer
representing a date but not a time. The tagged integer is an
unsigned or negative value indicating the number of days since the
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
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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
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. IANA Considerations
2.1. Concise Binary Object Representation (CBOR) Tags Registrations
This section registers the following values in the IANA "Concise
Binary Object Representation (CBOR) Tags" registry [IANA.cbor-tags].
o Tag: 1004 (value requested)
o Data Item: UTF-8 text string
o Semantics: RFC 3339 full-date string
o Reference: [[ this specification ]]
o Tag: 100 (ASCII 'd') (value requested)
o Data Item: Unsigned or negative integer
o Semantics: Number of days since the epoch date 1970-01-01
o Reference: [[ this specification ]]
3. Security Considerations
The security considerations of RFC 7049 apply; the tags introduced
here are not expected to raise security considerations beyond those.
A date, of course, has significant security considerations; these
include the exploitation of ambiguities where the date is security
relevant or where the date is used in access control decisions.
4. References
4.1. 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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[RFC3339] Klyne, G. and C. Newman, "Date and Time on the Internet:
Timestamps", RFC 3339, DOI 10.17487/RFC3339, July 2002,
<https://www.rfc-editor.org/info/rfc3339>.
[RFC7049] Bormann, C. and P. Hoffman, "Concise Binary Object
Representation (CBOR)", RFC 7049, DOI 10.17487/RFC7049,
October 2013, <https://www.rfc-editor.org/info/rfc7049>.
[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>.
4.2. Informative References
[IANA.cbor-tags]
IANA, "Concise Binary Object Representation (CBOR) Tags",
<http://www.iana.org/assignments/cbor-tags>.
[POSIX.1] IEEE, "The Open Group Base Specifications Issue 7",
IEEE Std 1003.1, 2013 Edition, 2013,
<http://pubs.opengroup.org/onlinepubs/9699919799/basedefs/
V1_chap04.html#tag_04_15>.
Acknowledgements
Thanks to Carsten Bormann for supporting creation of this
specification. Parts of the explanatory text in this specification
come from draft-bormann-cbor-time-tag-02.
Document History
[[ 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
o Initial working group version based on draft-jones-cbor-date-
tag-01 with no normative changes.
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Authors' Addresses
Michael B. Jones
Microsoft
Email: mbj@microsoft.com
URI: https://self-issued.info/
Anthony Nadalin
Microsoft
Email: tonynad@microsoft.com
Joerg Richter
pdv Financial Software GmbH
Email: joerg.richter@pdv-fs.de
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