ISO IEC 8825-3-2015 Information technology - ASN 1 encoding rules Specification of Encoding Control Notation (ECN)《信息技术 ASN 1编码规则 编码控制符号表示法(ECN)规范》.pdf

1、 Reference number ISO/IEC 8825-3:2015(E) ISO/IEC 2015INTERNATIONAL STANDARD ISO/IEC 8825-3 Third edition 2015-11-15 Information technology ASN.1 encoding rules: Specification of Encoding Control Notation (ECN) Technologies de linformation Rgles de codage ASN.1: Spcification de la notation de contrle

2、 de codage (ECN) ISO/IEC 8825-3:2015(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 posting on the inte

3、rnet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web

4、 www.iso.org Published in Switzerland ii ISO/IEC 2015 All rights reservedISO/IEC 8825-3:2015(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 worldwide stan

5、dardization. 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 collaborate in fields o

6、f 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 are drafted in ac

7、cordance 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 International

8、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 rights. This third

9、 edition cancels and replaces the second edition of ISO/IEC 8825-3:2008 which has been technically revised. It also incorporates ISO/IEC 8825-3:2008/Cor.1:2012. ISO/IEC 8825-3 was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology Subcommittee SC 6, Telecommunications and in

10、formation exchange between systems, in collaboration with ITU-T. The identical text is published as ITU-T X.692 (08/2015). 7 International Telecommunication Union ITU-T X.692 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (08/2015) SERIES X: DATA NETWORKS, OPEN SYSTEM COMMUNICATIONS AND SECURITY OS

11、I networking and system aspects Abstract Syntax Notation One (ASN.1) Information technology ASN.1 encoding rules: Specification of Encoding Control Notation (ECN) Recommendation ITU-T X.692 ITU-T X-SERIES RECOMMENDATIONS DATA NETWORKS, OPEN SYSTEM COMMUNICATIONS AND SECURITY PUBLIC DATA NETWORKS Ser

12、vices and facilities X.1X.19 Interfaces 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

13、specifications X.220X.229 Connectionless-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

14、transmission systems X.350X.369 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 On

15、e (ASN.1) X.680X.699 OSI MANAGEMENT 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, con

16、currency and recovery X.850X.859 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

17、 SECURE APPLICATIONS AND SERVICES 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.692 (08/2015) i INTERNATIONAL STANDARD ISO/IEC 8825-3 RECOMMENDATION ITU-T X.692 I

18、nformation technology ASN.1 encoding rules: Specification of Encoding Control Notation (ECN) Summary Recommendation ITU-T X.692 | ISO/IEC 8825-3 defines the Encoding Control Notation (ECN) used to specify encodings (of ASN.1 types) that differ from those provided by standardized encoding rules such

19、as the Basic Encoding Rules (BER) and the Packed Encoding Rules (PER). History Edition Recommendation Approval Study Group Unique ID *1.0 ITU-T X.692 2002-03-08 17 11.1002/1000/5647 1.1 ITU-T X.692 (2002) Annex E 2002-03-08 17 11.1002/1000/6361 1.2 ITU-T X.692 (2002) Amd. 1 2004-08-29 17 11.1002/100

20、0/7292 1.3 ITU-T X.692 (2002) Technical Cor. 1 2005-05-14 17 11.1002/1000/8514 1.4 ITU-T X.692 (2002) Amd. 2 2006-06-13 17 11.1002/1000/8840 2.0 ITU-T X.692 2008-11-13 17 11.1002/1000/9610 2.1 ITU-T X.692 (2008) Cor. 1 2011-10-14 17 11.1002/1000/11380 3.0 ITU-T X.692 2015-08-13 17 11.1002/1000/12485

21、 *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-T X.692 (08/2015) FOREWORD The International Telecommunication Union (ITU) is t

22、he 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 responsible for studying technical, operating and tariff questions and issuing Re

23、commendations 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 the ITU-T study groups which, in turn, produce Recommendations on these topics. T

24、he 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 collaborative basis with ISO and IEC. NOTE In this Recommendation, the expression “Admi

25、nistration“ 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 mandatory provisions (to ensure, e.g., interoperability or applicability) and c

26、ompliance 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 requirements. The use of such words does not suggest that compliance with the Recommendati

27、on 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 takes no position concerning the evidence, validity or applicability of claime

28、d 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 property, protected by patents, which may be required to implement this Recommen

29、dation. 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 reserved. No part of this publication may be reproduced, by any means whatsoever, wi

30、thout the prior written permission of ITU. Rec. ITU-T X.692 (08/2015) iii CONTENTS Page Introduction x Information technology ASN.1 encoding rules: Specification of Encoding Control Notation (ECN) 1 1 Scope . 1 2 Normative references. 1 2.1 Identical Recommendations | International Standards . 1 2.2

31、 Additional references . 2 3 Definitions . 2 3.1 ASN.1 definitions . 2 3.2 ECN-specific definitions 2 4 Abbreviations 5 5 Definition of ECN syntax 5 6 Encoding conventions and notation . 5 7 The ECN character set . 5 8 ECN lexical items 6 8.1 Encoding object references 6 8.2 Encoding object set refe

32、rences . 6 8.3 Encoding class references 7 8.4 Reserved word items 7 8.5 Reserved encoding class name items . 7 8.6 Non-ECN item . 7 9 ECN Concepts . 8 9.1 Encoding Control Notation (ECN) specifications 8 9.2 Encoding classes 8 9.3 Encoding structures 9 9.4 Encoding objects 9 9.5 Encoding object set

33、s . 9 9.6 Defining new encoding classes 10 9.7 Defining encoding objects 11 9.8 Differential encoding-decoding 11 9.9 Encoders options in encodings . 12 9.10 Properties of encoding objects . 12 9.11 Parameterization . 12 9.12 Governors . 13 9.13 General aspects of encodings . 13 9.14 Identification

34、of information elements . 14 9.15 Reference fields and determinants . 14 9.16 Replacement classes and structures 14 9.17 Mapping abstract values onto fields of encoding structures . 15 9.18 Transforms and transform composites . 16 9.19 Contents of Encoding Definition Modules . 16 9.20 Contents of th

35、e Encoding Link Module . 17 9.21 Defining encodings for primitive encoding classes 17 9.22 Application of encodings . 19 9.23 Combined encoding object set . 19 9.24 Application point 19 9.25 Conditional encodings 20 9.26 Other conditions for applying encodings . 20 9.27 Encoding control for the open

36、 type 21 9.28 Changes to ASN.1 Recommendations | International Standards 21 iv Rec. ITU-T X.692 (08/2015) 10 Identifying encoding classes, encoding objects, and encoding object sets 21 11 Encoding ASN.1 types 24 11.1 General . 24 11.2 Built-in encoding classes used for implicitly generated encoding

37、structures . 25 11.3 Simplification and expansion of ASN.1 notation for encoding purposes . 25 11.4 The implicitly generated encoding structure 27 12 The Encoding Link Module (ELM) . 28 12.1 Structure of the ELM 28 12.2 Encoding types . 28 13 Application of encodings . 29 13.1 General . 29 13.2 The

38、combined encoding object set and its application . 29 14 The Encoding Definition Module (EDM) . 32 15 The renames clause 33 15.1 Explicitly generated and exported structures 33 15.2 Name changes 34 15.3 Specifying the region for name changes 35 16 Encoding class assignments. 36 16.1 General . 36 16.

39、2 Encoding structure definition . 39 16.3 Alternative encoding structure . 42 16.4 Repetition encoding structure . 43 16.5 Concatenation encoding structure 43 17 Encoding object assignments. 44 17.1 General . 44 17.2 Encoding with a defined syntax . 44 17.3 Encoding with encoding object sets . 45 17

40、.4 Encoding using value mappings . 46 17.5 Encoding an encoding structure . 46 17.6 Differential encoding-decoding 48 17.7 Encoding options 49 17.8 Non-ECN definition of encoding objects . 50 18 Encoding object set assignments . 50 18.1 General . 50 18.2 Built-in encoding object sets 51 19 Mapping v

41、alues . 52 19.1 General . 52 19.2 Mapping by explicit values 53 19.3 Mapping by matching fields . 54 19.4 Mapping by #TRANSFORM encoding objects 55 19.5 Mapping by abstract value ordering . 56 19.6 Mapping by value distribution . 57 19.7 Mapping integer values to bits . 58 20 Defining encoding objec

42、ts using defined syntax . 59 21 Types used in defined syntax specification . 60 21.1 The Unit type . 60 21.2 The EncodingSpaceSize type . 60 21.3 The EncodingSpaceDetermination type 61 21.4 The UnusedBitsDetermination type . 61 21.5 The OptionalityDetermination type 62 21.6 The AlternativeDeterminat

43、ion type 63 21.7 The RepetitionSpaceDetermination type . 63 21.8 The Justification type 6 4 Rec. ITU-T X.692 (08/2015) v 21.9 The Padding type 65 21.10 The Pattern and Non-Null-Pattern types . 65 21.11 The RangeCondition type 66 21.12 The Comparison type . 66 21.13 The SizeRangeCondition type 67 21.

44、14 The ReversalSpecification type . 67 21.15 The ResultSize type . 68 21.16 The HandleValueSet type 68 21.17 The IntegerMapping type . 69 22 Commonly used encoding property groups . 69 22.1 Replacement specification 69 22.1.1 Encoding properties, syntax and purpose . 69 22.1.2 Specification restrict

45、ions 70 22.1.3 Encoder actions 71 22.1.4 Decoder actions 72 22.2 Pre-alignment and padding specification . 72 22.2.1 Encoding properties, syntax and purpose . 72 22.2.2 Specification constraints 72 22.2.3 Encoder actions 73 22.2.4 Decoder actions 73 22.3 Start pointer specification . 73 22.3.1 Encod

46、ing properties, syntax and purpose . 73 22.3.2 Specification constraints 73 22.3.3 Encoder actions 73 22.3.4 Decoder actions 74 22.4 Encoding space specification . 74 22.4.1 Encoding properties, syntax and purpose . 74 22.4.2 Specification restrictions 75 22.4.3 Encoder actions 75 22.4.4 Decoder act

47、ions 76 22.5 Optionality determination 76 22.5.1 Encoding properties, syntax and purpose . 76 22.5.2 Specification restrictions 76 22.5.3 Encoder actions 77 22.5.4 Decoder actions 77 22.6 Alternative determination . 78 22.6.1 Encoding properties, syntax and purpose . 78 22.6.2 Specification restrict

48、ions 78 22.6.3 Encoder actions 79 22.6.4 Decoder actions 79 22.7 Repetition space specification 79 22.7.1 Encoding properties, syntax and purpose . 79 22.7.2 Specification constraints 80 22.7.3 Encoder actions 81 22.7.4 Decoder actions 82 22.8 Value padding and justification 82 22.8.1 Encoding prope

49、rties, syntax, and purpose 82 22.8.2 Specification restrictions 83 22.8.3 Encoder actions 83 22.8.4 Decoder actions 84 22.9 Identification handle specification . 84 22.9.1 Encoding properties, syntax and purpose . 84 22.9.2 Specification constraints 85 22.9.3 Encoders actions . 85 22.9.4 Decoders actions 85 22.10 Concatenation specification . 86 22.10.1 Encoding properties, syntax and purpose . 86 22.10.2 Specification constraints 86 22.10.3 Encoder actions 86 22.10.4 Decoder actions 87 vi Rec. ITU-T X.692 (08/