1、 Reference number ISO/IEC 8825-6:2015(E) ISO/IEC 2015INTERNATIONAL STANDARD ISO/IEC 8825-6 Third edition 2015-11-15 Information technology ASN.1 encoding rules: Registration and application of PER encoding instructions Technologies de linformation Rgles de codage ASN.1: Enregistrement et application
2、 des instructions de codage PER ISO/IEC 8825-6:2015(E) COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2015 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or post
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4、ightiso.org Web www.iso.org Published in Switzerland ii ISO/IEC 2015 All rights reservedISO/IEC 8825-6:2015(E) ISO/IEC 2015 All rights reserved iiiForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for
5、 worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collabor
6、ate in fields of mutual interest. Other international organizations, governmental and non-governmental, in liaison with ISO and IEC, also take part in the work. In the field of information technology, ISO and IEC have established a joint technical committee, ISO/IEC JTC 1. International Standards ar
7、e drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of the joint technical committee is to prepare International Standards. Draft International Standards adopted by the joint technical committee are circulated to national bodies for voting. Publication as an
8、 International Standard requires approval by at least 75 % of the national bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO and IEC shall not be held responsible for identifying any or all such patent rig
9、hts. This third edition cancels and replaces the second edition of ISO/IEC 8825-6:2008 which has been technically revised. ISO/IEC 8825-6 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 6, Telecommunications and information exchange between systems, i
10、n collaboration with ITU-T. The identical text is published as ITU-T X.695 (08/2015). International Telecommunication Union ITU-T X.695 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2015) SERIES X: DATA NETWORKS, OPEN SYSTEM COMMUNICATIONS AND SECURITY OSI networking and system aspects Abstrac
11、t Syntax Notation One (ASN.1) Information technology ASN.1 encoding rules: Registration and application of PER encoding instructions Recommendation ITU-T X.695 ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS, OPEN SYSTEM COMMUNICATIONS AND SECURITY PUBLIC DATA NETWORKS Services and facilities X.1X.19 I
12、nterfaces X.20X.49 Transmission, signalling and switching X.50X.89 Network aspects X.90X.149 Maintenance X.150X.179 Administrative arrangements X.180X.199 OPEN SYSTEMS INTERCONNECTION Model and notation X.200X.209 Service definitions X.210X.219 Connection-mode protocol specifications X.220X.229 Conn
13、ectionless-mode protocol specifications X.230X.239 PICS proformas X.240X.259 Protocol Identification X.260X.269 Security Protocols X.270X.279 Layer Managed Objects X.280X.289 Conformance testing X.290X.299 INTERWORKING BETWEEN NETWORKS General X.300X.349 Satellite data transmission systems X.350X.36
14、9 IP-based networks X.370X.379 MESSAGE HANDLING SYSTEMS X.400X.499 DIRECTORY X.500X.599 OSI NETWORKING AND SYSTEM ASPECTS Networking X.600X.629 Efficiency X.630X.639 Quality of service X.640X.649 Naming, Addressing and Registration X.650X.679 Abstract Syntax Notation One (ASN.1) X.680X.699 OSI MANAG
15、EMENT Systems management framework and architecture X.700X.709 Management communication service and protocol X.710X.719 Structure of management information X.720X.729 Management functions and ODMA functions X.730X.799 SECURITY X.800X.849 OSI APPLICATIONS Commitment, concurrency and recovery X.850X.8
16、59 Transaction processing X.860X.879 Remote operations X.880X.889 Generic applications of ASN.1 X.890X.899 OPEN DISTRIBUTED PROCESSING X.900X.999 INFORMATION AND NETWORK SECURITY X.1000X.1099 SECURE APPLICATIONS AND SERVICES X.1100X.1199 CYBERSPACE SECURITY X.1200X.1299 SECURE APPLICATIONS AND SERVI
17、CES X.1300X.1399 CYBERSECURITY INFORMATION EXCHANGE X.1500X.1599 CLOUD COMPUTING SECURITY X.1600X.1699 For further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T X.695 (08/2015) i INTERNATIONAL STANDARD ISO/IEC 8825-6 RECOMMENDATION ITU-T X.695 Information technology ASN.1 en
18、coding rules: Registration and application of PER encoding instructions Summary Recommendation ITU-T X.695 | ISO/IEC 8825-6 specifies the rules for applying PER encoding instructions using either type prefixes or an encoding control section. Encoding instructions are a means of modifying the encodin
19、gs of ASN.1 types for some specified encoding rule (in this case PER). They can be inserted in an ASN.1 specification in square brackets (much like a tag in the Basic Encoding Rules, BER) immediately before the type that they affect (type prefixes), or they can be collected together at the end of an
20、 ASN.1 module (an encoding control section). It also specifies the procedures for developing, registering and publishing new PER encoding instructions from time to time. History Edition Recommendation Approval Study Group Unique ID *1.0 ITU-T X.695 2007-05-29 17 11.1002/1000/9112 2.0 ITU-T X.695 200
21、8-11-13 17 11.1002/1000/9613 3.0 ITU-T X.695 2015-08-13 17 11.1002/1000/12488 _ *To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-
22、T X.695 (08/2015) FOREWORD The International Telecommunication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is re
23、sponsible for studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by th
24、e ITU-T study groups which, in turn, produce Recommendations on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collabor
25、ative basis with ISO and IEC. NOTE In this Recommendation, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain
26、mandatory provisions (to ensure, e.g., interoperability or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirement
27、s. The use of such words does not suggest that compliance with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTS ITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU
28、 takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual p
29、roperty, protected by patents, which may be required to implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2015 All rights reser
30、ved. No part of this publication may be reproduced, by any means whatsoever, without the prior written permission of ITU. Rec. ITU-T X.695 (08/2015) iii CONTENTS Page 1 Scope 1 2 Normative references 1 2.1 Identical Recommendations | International Standards 1 3 Definitions 1 4 Abbreviations . 2 5 No
31、tation 2 6 Information to be provided to specify a PER encoding instruction 2 7 Status of a PER EI proposal during the approval process 3 8 Approval process 3 9 Publication by the Registration Authority 4 10 Restrictions on the use of PER Encoding Instructions . 4 11 Assigning a PER EI to an ASN.1 t
32、ype using a type prefix . 4 12 Assigning a PER encoding instruction using an encoding control section . 5 12.1 The encoding instruction assignment list 5 12.2 Identification of the targets for a PER encoding instruction using a target list . 5 12.2.1 General rules . 5 12.2.2 Target identification us
33、ing an ASN.1 type reference and identifiers 7 12.2.3 Target identification using a built-in type name 8 12.2.4 Use of identifiers in context 8 13 Multiple assignment of PER encoding instructions 9 13.1 Order in which multiple assignments are considered 9 13.2 Effect of assigning a negating encoding
34、instruction 9 13.3 Multiple assignment of PER encoding instructions 9 Annex A Example of the application of PER EIs using prefixed encoding instructions .11 Annex B Example of the application of PER EIs using targeted encoding instructions .14 Annex C Summary of the ASN.1 notation 16 iv Rec. ITU-T X
35、.695 (08/2015) Introduction Rec. ITU-T X.680 | ISO/IEC 8824-1 makes syntactic provision for the application of encoding instructions to modify the behaviour of a particular set of encoding rules, identified by an encoding reference (see Rec. ITU-T X.680 | ISO/IEC 8824-1). Rec. ITU-T X.691 | ISO/IEC
36、8825-2 specifies the BASIC-PER and CANONICAL-PER encoding rules, each with two variants: the ALIGNED variant and the UNALIGNED variant. The PER encoding instructions allow minor variations to be made in parts of the UNALIGNED variant of a BASIC-PER and CANONICAL-PER encoding. They have no effect on
37、the ALIGNED variant of these encodings. NOTE The purpose of PER encoding instructions is to ease the task of producing an ASN.1 specification, which when encoded by the UNALIGNED variant of a PER encoding produces bit-patterns that exactly match those of a legacy protocol. It is unusual for the ALIG
38、NED variant to be used for this purpose, and so for simplicity all PER encoding instructions have no effect on the ALIGNED variant. This Recommendation | International Standard specifies the use of type prefixes and encoding control sections (see Rec. ITU-T X.680 | ISO/IEC 8824-1, 31.3 and clause 54
39、) to associate one or more PER encoding instructions with an ASN.1 type. Where an encoding instruction is associated with an ASN.1 type, specific clauses in Rec. ITU-T X.691 | ISO/IEC 8825-2 are amended according to the specification of the encoding instruction. These mechanisms are similar to those
40、 for the application of XER encoding instructions specified in Rec. ITU-T X.693 | ISO/IEC 8825-4. This Recommendation | International Standard also specifies the procedures for the operation of a Registration Authority to receive, record and publish the specification of PER encoding instructions tha
41、t are agreed from time to time. The Registration Authority is the ITU Telecommunication Standardization Bureau, and the form of publication is an Implementers Guide for ASN.1. This Guide will be available freely on an ITU-T web-site. This Recommendation | International Standard also specifies the pr
42、ocedures to be used for the approval of new PER encoding instructions. Broadly, these procedures involve the prior publication in the Implementers Guide of a proposed new encoding instruction, with a later publication announcing that the new encoding instruction has been approved by a simple resolut
43、ion of the relevant Study Group of ITU-T and the relevant Sub-Committee of ISO/IEC JTC 1. Clauses 6 to 9 specify the operation of the Registration Authority for PER encoding instructions. Clauses 10 to 13 specify the application of PER encoding instructions to an ASN.1 specification. Annex A is info
44、rmative and contains an example of the application of PER encoding instructions using encoding prefixes. Annex B is informative and contains an example of the application of the same PER encoding instructions using an encoding control section. Annex C is informative and summarizes the productions de
45、fined in this Recommendation | International Standard. ISO/IEC 8825-6:2015 (E) Rec. ITU-T X.695 (08/2015) 1 INTERNATIONAL STANDARD ITU-T RECOMMENDATION Information technology ASN.1 encoding rules: Registration and application of PER encoding instructions 1 Scope This Recommendation | International S
46、tandard: a) specifies the information needed and the format to be used for specifying PER encoding instructions; b) specifies the mechanisms for approving new PER encoding instructions from time to time and the operation of the Registration Authority for PER encoding instructions; c) specifies the m
47、eans of associating a PER encoding instruction with an ASN.1 type using both type prefixes and an encoding control section. 2 Normative references The following Recommendations and International Standards contain provisions which, through reference in this text, constitute provisions of this Recomme
48、ndation | International Standard. At the time of publication, the editions indicated were valid. All Recommendations and Standards are subject to revision, and parties to agreements based on this Recommendation | International Standard are encouraged to investigate the possibility of applying the mo
49、st recent edition of the Recommendations and Standards listed below. Members of IEC and ISO maintain registers of currently valid International Standards. The Telecommunication Standardization Bureau of the ITU maintains a list of currently valid ITU-T Recommendations. 2.1 Identical Recommendations | International Standards Recommendation ITU-T X.680 (2015) | ISO/IEC 8824-1:2015, Information technology Abstract Syntax Notation One (ASN.1): Specification of basic notation. Recomm
