GOST 28147-89: Encryption, Decryption, and Message Authentication Code (MAC) Algorithms
RFC 5830

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Independent Submission                                  V. Dolmatov, Ed.
Request for Comments: 5830                               Cryptocom, Ltd.
Category: Informational                                       March 2010
ISSN: 2070-1721

                 GOST 28147-89: Encryption, Decryption,
            and Message Authentication Code (MAC) Algorithms

Abstract

   This document is intended to be a source of information about the
   Russian Federal standard for electronic encryption, decryption, and
   message authentication algorithms (GOST 28147-89), which is one of
   the Russian cryptographic standard algorithms called GOST
   algorithms).  Recently, Russian cryptography is being used in
   Internet applications, and this document has been created as
   information for developers and users of GOST 28147-89 for encryption,
   decryption, and message authentication.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   This is a contribution to the RFC Series, independently of any other
   RFC stream.  The RFC Editor has chosen to publish this document at
   its discretion and makes no statement about its value for
   implementation or deployment.  Documents approved for publication by
   the RFC Editor are not a candidate for any level of Internet
   Standard; see Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc5830.

Dolmatov                      Informational                     [Page 1]
RFC 5830                      GOST 28147-89                   March 2010

Copyright Notice

   Copyright (c) 2010 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
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   This document may not be modified, and derivative works of it may not
   be created, except to format it for publication as an RFC or to
   translate it into languages other than English.

Table of Contents

   1. Introduction ....................................................3
      1.1. General Information ........................................3
   2. Applicability ...................................................3
   3. Definitions and Notations .......................................3
      3.1. Definitions ................................................3
      3.2. Notation ...................................................4
   4. General Statements ..............................................4
   5. The Electronic Codebook Mode ....................................6
      5.1. Encryption of Plain Text in the Electronic Codebook Mode ...6
      5.2. Decryption of the Ciphertext in the Electronic
           Codebook Mode ..............................................9
   6. The Counter Encryption Mode ....................................10
      6.1. Encryption of Plain Text in the Counter Encryption Mode ...10
      6.2. Decryption of Ciphertext in the Counter Encryption Mode ...13
   7. The Cipher Feedback Mode .......................................13
      7.1. Encryption of Plain Text in the Cipher Feedback Mode ......13
      7.2. Decryption of Ciphertext in the Cipher Feedback Mode ......14
   8. Message Authentication Code (MAC) Generation Mode ..............15
   9. Security Considerations ........................................17
   10. Normative References ..........................................17
   Appendix A. Values of the Constants C1 and C2 .....................18
   Appendix B. Contributors ..........................................19

Dolmatov                      Informational                     [Page 2]
RFC 5830                      GOST 28147-89                   March 2010

1.  Introduction

1.1.  General Information

   [GOST28147-89] is the unified cryptographic transformation algorithm
   for information processing systems of different purposes, defining
   the encryption/decryption rules and the message authentication code
   (MAC) generation rules.

   This cryptographic transformation algorithm is intended for hardware
   or software implementation and corresponds to the cryptographic
   requirements.  It puts no limitations on the encrypted information
   secrecy level.

2.  Applicability

   GOST 28147-89 defines the encryption/decryption model and MAC
   generation for a given message (document) that is meant for
   transmission via insecure public telecommunication channels between
   data processing systems of different purposes.

   GOST 28147-89 is obligatory to use in the Russian Federation in all