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Informationsteknologi Sikkerhedsteknikker. Del 2: Hashfunktioner, der anvender n-bit blokchiffer - PDF
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1 Dansk standard DS/ISO udgave Informationsteknologi Sikkerhedsteknikker Hashfunktioner Del 2: Hashfunktioner, der anvender n-bit blokchiffer Information technology Security techniques Hash-functions Part 2: Hash-functions using an n-bit block cipher
2 DS/ISO København DS projekt: M ICS: Første del af denne publikations betegnelse er: DS/ISO, hvilket betyder, at det er en international standard, der har status som dansk standard Denne publikations overensstemmelse er: IDT med: ISO IEC :2010. DS-publikationen er på engelsk. Denne publikation erstatter: DS/ISO/IEC :2002. DS-publikationstyper Dansk Standard udgiver forskellige publikationstyper. Typen på denne publikation fremgår af forsiden. Der kan være tale om: Dansk standard standard, der er udarbejdet på nationalt niveau, eller som er baseret på et andet lands nationale standard, eller standard, der er udarbejdet på internationalt og/eller europæisk niveau, og som har fået status som dansk standard DS-information publikation, der er udarbejdet på nationalt niveau, og som ikke har opnået status som standard, eller publikation, der er udarbejdet på internationalt og/eller europæisk niveau, og som ikke har fået status som standard, fx en teknisk rapport, eller europæisk præstandard DS-håndbog samling af standarder, eventuelt suppleret med informativt materiale DS-hæfte publikation med informativt materiale Til disse publikationstyper kan endvidere udgives tillæg og rettelsesblade DS-publikationsform Publikationstyperne udgives i forskellig form som henholdsvis fuldtekstpublikation (publikationen er trykt i sin helhed) godkendelsesblad (publikationen leveres i kopi med et trykt DS-omslag) elektronisk (publikationen leveres på et elektronisk medie) DS-betegnelse Alle DS-publikationers betegnelse begynder med DS efterfulgt af et eller flere præfikser og et nr., fx DS 383, DS/EN 5414 osv. Hvis der efter nr. er angivet et A eller Cor, betyder det, enten at det er et tillæg eller et rettelsesblad til hovedstandarden, eller at det er indført i hovedstandarden. DS-betegnelse angives på forsiden. Overensstemmelse med anden publikation: Overensstemmelse kan enten være IDT, EQV, NEQ eller MOD IDT: Når publikationen er identisk med en given publikation. EQV: Når publikationen teknisk er i overensstemmelse med en given publikation, men præsentationen er ændret. NEQ: Når publikationen teknisk eller præsentationsmæssigt ikke er i overensstemmelse med en given standard, men udarbejdet på baggrund af denne. MOD: Når publikationen er modificeret i forhold til en given publikation.
3 INTERNATIONAL STANDARD ISO/IEC Third edition Information technology Security techniques Hash-functions Part 2: Hash-functions using an n-bit block cipher Technologies de l'information Techniques de sécurité Fonctions de brouillage Partie 2: Fonctions de brouillage utilisant un chiffrement par blocs de n bits Reference number ISO/IEC :2010(E) ISO/IEC 2010
4 PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's 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 computer performing the editing. In downloading this file, parties accept therein the responsibility of not infringing Adobe's licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO/IEC 2010 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 permission in writing from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel Fax Web Published in Switzerland ii ISO/IEC 2010 All rights reserved
5 Contents Page Foreword...v Introduction...vi 1 Scope Normative references Terms and definitions Symbols and abbreviated terms Use of the general model Hash-function General Parameter selection Padding method Initializing value Round function Output transformation Hash-function General Parameter selection Padding method Initializing value Round function Output transformation Hash-function General Parameter selection Padding method Initializing value Round function Output transformation Hash-function General Parameter selection Padding method Initializing value Round function Output transformation...11 Annex A (informative) Use of AES...13 A.1 General...13 A.2 Hash-function A.3 Hash-function A.4 Hash-function A.5 Hash-function Annex B (informative) Examples...15 B.1 General...15 B.2 Hash-function B.3 Hash-function B.4 Hash-function ISO/IEC 2010 All rights reserved iii
6 B.5 Hash-function Annex C (normative) ASN.1 Module...27 Bibliography...29 iv ISO/IEC 2010 All rights reserved
7 Foreword 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 committees established by the respective organization to deal with particular fields of technical activity. ISO and IEC technical committees collaborate 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 are 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 International Standard requires approval by at least 75 % of the national bodies casting a vote. ISO/IEC was prepared by Joint Technical Committee ISO/IEC JTC 1, Information technology, Subcommittee SC 27, IT Security techniques. This third edition cancels and replaces the second edition (ISO/IEC :2000), which has been technically revised. It also incorporates the Technical Corrigendum ISO/IEC :2000/Cor.2:2007. The major change is that in the second edition the underlying block cipher used in the hash-functions was assumed to be Data Encryption Algorithm (DEA), whereas in the third edition it is assumed to be more secure block ciphers like Advanced Encryption Standard (AES) and other ciphers included in ISO/IEC ISO/IEC consists of the following parts, under the general title Information technology Security techniques Hash-functions: Part 1: General Part 2: Hash-functions using an n-bit block cipher Part 3: Dedicated hash-functions Part 4: Hash-functions using modular arithmetic ISO/IEC 2010 All rights reserved v
8 Introduction The International Organization for Standardization (ISO) and International Electrotechnical Commission (IEC) draw attention to the fact that it is claimed that compliance with this document may involve the use of patents. The ISO and IEC take no position concerning the evidence, validity and scope of these patent rights. The holders of these patent rights have assured the ISO and IEC that they are willing to negotiate licences under reasonable and non-discriminatory terms and conditions with applicants throughout the world. In this respect, the statements of the holders of these patent rights are registered with the ISO and IEC. Information may be obtained from the ISO/IEC JTC 1 Patent database: Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights other than those identified above. ISO and IEC shall not be held responsible for identifying any or all such patent rights. vi ISO/IEC 2010 All rights reserved
9 INTERNATIONAL STANDARD ISO/IEC :2010(E) Information technology Security techniques Hash-functions Part 2: Hash-functions using an n-bit block cipher 1 Scope This part of ISO/IEC specifies hash-functions which make use of an n-bit block cipher algorithm. They are therefore suitable for an environment in which such an algorithm is already implemented. Four hash-functions are specified. The first provides hash-codes of length less than or equal to n, where n is the block-length of the underlying block cipher algorithm used. The second provides hash-codes of length less than or equal to 2n; the third provides hash-codes of length equal to 2n; and the fourth provides hash-codes of length 3n. All four of the hash-functions specified in this part of ISO/IEC conform to the general model specified in ISO/IEC Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO/IEC :2000, Information technology Security techniques Hash-functions Part 1: General 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO/IEC and the following apply. 3.1 block string of bits of defined length 3.2 n-bit block cipher block cipher with the property that plaintext blocks and ciphertext blocks are n bits in length [ISO/IEC :2005] 3.3 round function function φ (.,.) that transforms two binary strings of lengths L 1 and L 2 to a binary string of length L 2 NOTE The round function is used iteratively. ISO/IEC 2010 All rights reserved 1