ISO/IEC INTERNATIONAL STANDARD 10118-4 First edition 1998-12-15 Information technology Security techniques Hash-functions - Part 4: Hash-functions using modular arithmetic Technologies de I'information Techniques de sécurité Fonctions debrouillage Partie 4: Fonctions de hachage utilisant I'arithmetique modulaire IEC Reference number ISO/IEC 10118-4:1998(E) ted without license from IHS Not for Resale ISO/IEC 10118-4:1998(E) Contents 1 Scope 2 Normative reference 3 Terms and definitions 3.1 From ISO/IEC 10118-1. 3.2 Unique to this part of ISO/IEc 10118... 3.3 Conyentions 4 Symbols and abbreviated terms.. 4.1 From ISO/IEC 10118-1 4.2 Unique to this part of ISO/IEC 10118. 5 Requirements ... 6 Variables and values needed for the hash operation. 6.1 The length of the hash-code and of the modulus.. 6.2 The modulus of the round-function 4 6.3 Initializing value 6.4 Exponent.. 6.5 Reduction-function prime number.. .5 7 Hashing procedure 7.1 Preparation of the data string ... .5 7.1.1 Padding the data string 7.1.2 Appending the length 5 7.1.3 Splitting the data string .. 7.1.4 Expansion 7.2 Application of the round-function. ISO/IEC1998 microfilm, without permission in writing from the publisher. ISO/IEC Copyright Office · Case postale 56 · CH-1211 Geneve 20 · Switzerland Printed in Switzerland Copyright International Organization for Standardization Not for Resale @ ISO/IEC ISO/IEC 10118-4:1998(E) 7.3 The Reduction-function.. 7.3.1 Splitting the block H 7.3.2 Extending the data string 7.3.3 Processing the half-blocks 7.3.4 Reduction 8 Hash-functions. 8.1 MASH-1. 8.2 MASH-2 Annex A (informative) Examples .9 Annex B (informative) Additional Information. 22 Annex C (informative) Bibliography 23 CopyrightInternationalOrganization for Standardization ili Not for Resale