1、Information technology ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER)CAN/CSA-ISO/IEC 8825-1:13(ISO/IEC 8825-1:2008, IDT)National Standard of CanadaNOT FOR RESALE. / PUBLICATION NON DESTINE LA REVENTE.Legal Noti
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20、n anglais seulement pour le moment. Le Groupe CSA publiera la versionen franais ds quelle sera produite par lorganisme rdacteur.TMA trade-mark of the Canadian Standards Association, operating as “CSA Group”National Standard of CanadaPublished in January 2013 by CSA GroupA not-for-profit private sect
21、or organization5060 Spectrum Way, Suite 100, Mississauga, Ontario, Canada L4W 5N61-800-463-6727 416-747-4044Visit our Online Store at shop.csa.caApproved byStandards Council of CanadaCAN/CSA-ISO/IEC 8825-1:13Information technology ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Ca
22、nonical Encoding Rules (CER) and Distinguished Encoding Rules (DER)Prepared by InternationalOrganizationforStandardization/ International Electrotechnical CommissionReviewed byCAN/CSA-ISO/IEC 8825-1:13Information technology ASN.1 encoding rules:Specification of Basic Encoding Rules (BER), CanonicalE
23、ncoding Rules (CER) and Distinguished Encoding RulesCSA/4 2013 CSA Group January 2013CAN/CSA-ISO/IEC 8825-1:13Information technology ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER)CSA PrefaceStandards developmen
24、t within the Information Technology sector is harmonized with international standards development. Through the CSA Technical Committee on Information Technology (TCIT), Canadians serve as the Canadian Advisory Committee (CAC) on ISO/IEC Joint Technical Committee 1 on Information Technology (ISO/IEC
25、JTC1) for the Standards Council of Canada (SCC), the ISO member body for Canada and sponsor of the Canadian National Committee of the IEC. Also, as a member of the International Telecommunication Union (ITU), Canada participates in the International Telegraph and Telephone Consultative Committee (IT
26、U-T).This Standard supersedes CAN/CSA-ISO/IEC 8825-1-04 (adoption of ISO/IEC 8825-1:2002).At the time of publication, ISO/IEC 8825-1:2008 is available from ISO and IEC in English only. CSA Group will publish the French version when it becomes available from ISO and IEC.This Standard is considered su
27、itable for use for conformity assessment within the stated scope of the Standard.This International Standard was reviewed by the TCIT under the jurisdiction of the Strategic Steering Committee on Information Technology and deemed acceptable for use in Canada. From time to time, ISO/IEC may publish a
28、ddenda, corrigenda, etc. The TCIT will review these documents for approval and publication. For a listing, refer to the Current Standards Activities page at standardsactivities.csa.ca. This Standard has been formally approved, without modification, by the Technical Committee and has been approved as
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31、ndards and related publications, visit our Online Store at shop.csa.ca or call toll-free 1-800-463-6727 or 416-747-4044.This Standard is subject to periodic review, and suggestions for its improvement will be referred to the appropriate committee. To submit a proposal for change, please send the fol
32、lowing information to inquiriescsagroup.org and include “Proposal for change” in the subject line:(a) Standard designation (number);(b) relevant clause, table, and/or figure number;Reference numberISO/IEC 8825-1:2008(E)ISO/IEC 2008INTERNATIONAL STANDARD ISO/IEC8825-1Fourth edition2008-12-15Informati
33、on technology ASN.1 encoding rules: Specification of Basic Encoding Rules (BER), Canonical Encoding Rules (CER) and Distinguished Encoding Rules (DER) Technologies de linformation Rgles de codage ASN.1: Spcification des rgles de codage de base (BER), des rgles de codage canoniques (CER) et des rgles
34、 de codage distinctives (DER) ISO/IEC 8825-1:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the comput
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37、entral Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without per
38、mission in writing 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 www.iso.org ii ISO/IEC 2008 All rights reservedCAN/CSA-ISOIEC 8
39、825-1:13ISO/IEC 8825-1:2008(E) ISO/IEC 2008 All rights reserved iiiCONTENTS Page Introduction vi 1 Scope 1 2 Normative references . 1 2.1 Identical Recommendations | International Standards 1 2.2 Additional references 1 3 Definitions 2 4 Abbreviations . 2 5 Notation 2 6 Convention . 3 7 Conformance
40、3 8 Basic encoding rules. 3 8.1 General rules for encoding 3 8.1.1 Structure of an encoding . 3 8.1.2 Identifier octets .4 8.1.3 Length octets.5 8.1.4 Contents octets 6 8.1.5 End-of-contents octets. 6 8.2 Encoding of a boolean value. 6 8.3 Encoding of an integer value 7 8.4 Encoding of an enumerated
41、 value. 7 8.5 Encoding of a real value 7 8.6 Encoding of a bitstring value 8 8.7 Encoding of an octetstring value. 9 8.8 Encoding of a null value .10 8.9 Encoding of a sequence value.10 8.10 Encoding of a sequence-of value 10 8.11 Encoding of a set value .11 8.12 Encoding of a set-of value 11 8.13 E
42、ncoding of a choice value .11 8.14 Encoding of a value of a prefixed type .11 8.15 Encoding of an open type12 8.16 Encoding of an instance-of value12 8.17 Encoding of a value of the embedded-pdv type 12 8.18 Encoding of a value of the external type.12 8.19 Encoding of an object identifier value 14 8
43、.20 Encoding of a relative object identifier value .14 8.21 Encoding of an OID internationalized resource identifier value. 15 8.22 Encoding of a relative OID internationalized resource identifier value 15 8.23 Encoding for values of the restricted character string types . 15 8.24 Encoding for value
44、s of the unrestricted character string type. 17 8.25 Encoding for values of the Useful Types 17 8.26 Encoding for values of the TIME type and the useful time types . 17 8.26.1 Encoding for values of the TIME type 17 8.26.2 Encoding for values of the DATE type 18 8.26.3 Encoding for values of the TIM
45、E-OF-DAY type 18 8.26.4 Encoding for values of the DATE-TIME type . 18 8.26.5 Encoding for values of the DURATION type. 18 Foreword . v CAN/CSA-ISOIEC 8825-1:13ISO/IEC 8825-1:2008(E) iv ISO/IEC 2008 All rights reserved9.2 String encoding forms.18 9.3 Set components .18 10 Distinguished encoding rule
46、s .19 10.1 Length forms.19 10.2 String encoding forms.19 10.3 Set components .19 11 Restrictions on BER employed by both CER and DER. 19 11.1 Boolean values 19 11.2 Unused bits19 11.3 Real values 20 11.4 GeneralString values.20 11.5 Set and sequence components with default value . 20 11.6 Set-of com
47、ponents.20 11.7 GeneralizedTime.20 11.8 UTCTime 21 11.8.4 Examples of valid representations 21 11.8.5 Examples of invalid representations . 21 11.9 The TIME type and the useful time types . 21 12 Use of BER, CER and DER in transfer syntax definition22 Annex A Example of encodings. 23 A.1 ASN.1 descr
48、iption of the record structure.23 A.2 ASN.1 description of a record value.23 A.3 Representation of this record value.23 Annex B Identification of Encoding Rules. 25 Annex C Illustration of real value encoding. 26 9 Canonical encoding rules . 18 9.1 Length forms.18 CAN/CSA-ISOIEC 8825-1:13ISO/IEC 882
49、5-1:2008(E) ISO/IEC 2008 All rights reserved vForeword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission) form the specialized system for worldwide standardization. National bodies that are members of ISO or IEC participate in the development of International Standards through technical committ
