ASN.1 Translation
RFC 6025
| Document | Type | RFC - Informational (October 2010; No errata) | |
|---|---|---|---|
| Authors | Charles Gardiner , Carl Wallace | ||
| Last updated | 2019-08-24 | ||
| Stream | IETF | ||
| Formats | plain text html pdf htmlized bibtex | ||
| Reviews | |||
| Stream | WG state | WG Document | |
| Document shepherd | No shepherd assigned | ||
| IESG | IESG state | RFC 6025 (Informational) | |
| Action Holders |
(None)
|
||
| Consensus Boilerplate | Unknown | ||
| Telechat date | |||
| Responsible AD | Tim Polk | ||
| Send notices to | (None) | ||
Internet Engineering Task Force (IETF) C. Wallace
Request for Comments: 6025 Cygnacom Solutions
Category: Informational C. Gardiner
ISSN: 2070-1721 BBN Technologies
October 2010
ASN.1 Translation
Abstract
Abstract Syntax Notation One (ASN.1) is widely used throughout the
IETF Security Area and has been for many years. Some specifications
were written using a now deprecated version of ASN.1 and some were
written using the current version of ASN.1. Not all ASN.1 compilers
support both older and current syntax. This document is intended to
provide guidance to specification authors and to implementers
converting ASN.1 modules from one version of ASN.1 to another version
without causing changes to the "bits on the wire". This document
does not provide a comprehensive tutorial of any version of ASN.1.
Instead, it addresses ASN.1 features that are used in IETF Security
Area specifications with a focus on items that vary with the ASN.1
version.
Status of This Memo
This document is not an Internet Standards Track specification; it is
published for informational purposes.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Not all documents
approved by the IESG are a candidate for any level of Internet
Standard; see Section 2 of RFC 5741.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
http://www.rfc-editor.org/info/rfc6025.
Wallace & Gardiner Informational [Page 1]
RFC 6025 ASN.1 Translation October 2010
Copyright Notice
Copyright (c) 2010 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
(http://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 Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Terminology . . . . . . . . . . . . . . . . . . . . . . . 3
2. ASN.1 Design Elements . . . . . . . . . . . . . . . . . . . . 3
2.1. Open Types . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1.1. ANY DEFINED BY . . . . . . . . . . . . . . . . . . . . 4
2.1.2. OCTET STRINGs and BIT STRINGs . . . . . . . . . . . . 5
2.1.3. Information Object Classes . . . . . . . . . . . . . . 5
2.2. Constraints . . . . . . . . . . . . . . . . . . . . . . . 8
2.2.1. Simple Table Constraints . . . . . . . . . . . . . . . 8
2.2.2. Component Relation Constraints . . . . . . . . . . . . 9
2.2.3. Content Constraints . . . . . . . . . . . . . . . . . 11
2.3. Parameterization . . . . . . . . . . . . . . . . . . . . . 12
2.4. Versioning and Extensibility . . . . . . . . . . . . . . . 13
2.4.1. Extension Markers . . . . . . . . . . . . . . . . . . 14
2.4.2. Version Brackets . . . . . . . . . . . . . . . . . . . 14
3. Character Set Differences . . . . . . . . . . . . . . . . . . 15
4. ASN.1 Translation . . . . . . . . . . . . . . . . . . . . . . 16
4.1. Downgrading from X.68x to X.208 . . . . . . . . . . . . . 16
4.2. Upgrading from X.208 to X.68x . . . . . . . . . . . . . . 16
5. Security Considerations . . . . . . . . . . . . . . . . . . . 17
6. References . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.1. Normative References . . . . . . . . . . . . . . . . . . . 18
6.2. Informative References . . . . . . . . . . . . . . . . . . 18
Wallace & Gardiner Informational [Page 2]
RFC 6025 ASN.1 Translation October 2010
1. Introduction
This document is intended to serve as a tutorial for converting ASN.1
modules written using [CCITT.X208.1988] to [CCITT.X680.2002], or vice
versa. Preparation of this document was motivated by [RFC5911] and
[RFC5912], which provide updated ASN.1 modules for a number of RFCs.
The intent of this specification is to assist with translation of
ASN.1 from one version to another without resulting in any changes to
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