GOST R 34.12-2015: Block Cipher "Magma"
RFC 8891

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Independent Submission                                  V. Dolmatov, Ed.
Request for Comments: 8891                          JSC "NPK Kryptonite"
Updates: 5830                                               D. Baryshkov
Category: Informational                                     Auriga, Inc.
ISSN: 2070-1721                                           September 2020

                GOST R 34.12-2015: Block Cipher "Magma"

Abstract

   In addition to a new cipher with a block length of n=128 bits
   (referred to as "Kuznyechik" and described in RFC 7801), Russian
   Federal standard GOST R 34.12-2015 includes an updated version of the
   block cipher with a block length of n=64 bits and key length of k=256
   bits, which is also referred to as "Magma".  The algorithm is an
   updated version of an older block cipher with a block length of n=64
   bits described in GOST 28147-89 (RFC 5830).  This document is
   intended to be a source of information about the updated version of
   the 64-bit cipher.  It may facilitate the use of the block cipher in
   Internet applications by providing information for developers and
   users of the GOST 64-bit cipher with the revised version of the
   cipher for encryption and decryption.

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 candidates for any level of Internet Standard;
   see Section 2 of RFC 7841.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   https://www.rfc-editor.org/info/rfc8891.

Copyright Notice

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   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Table of Contents

   1.  Introduction
   2.  General Information
   3.  Definitions and Notation
     3.1.  Definitions
     3.2.  Notation
   4.  Parameter Values
     4.1.  Nonlinear Bijection
     4.2.  Transformations
     4.3.  Key Schedule
   5.  Basic Encryption Algorithm
     5.1.  Encryption
     5.2.  Decryption
   6.  IANA Considerations
   7.  Security Considerations
   8.  References
     8.1.  Normative References
     8.2.  Informative References
   Appendix A.  Test Examples
     A.1.  Transformation t
     A.2.  Transformation g
     A.3.  Key Schedule
     A.4.  Test Encryption
     A.5.  Test Decryption
   Appendix B.  Background
   Authors' Addresses

1.  Introduction

   The Russian Federal standard [GOSTR3412-2015] specifies basic block
   ciphers used as cryptographic techniques for information processing
   and information protection, including the provision of
   confidentiality, authenticity, and integrity of information during
   information transmission, processing, and storage in computer-aided
   systems.

   The cryptographic algorithms defined in this specification are
   designed both for hardware and software implementation.  They comply
   with modern cryptographic requirements and put no restrictions on the
   confidentiality level of the protected information.

   This document is intended to be a source of information about the
   updated version of the 64-bit cipher.  It may facilitate the use of
   the block cipher in Internet applications by providing information
   for developers and users of a GOST 64-bit cipher with the revised
   version of the cipher for encryption and decryption.

2.  General Information

   The Russian Federal standard [GOSTR3412-2015] was developed by the
   Center for Information Protection and Special Communications of the
   Federal Security Service of the Russian Federation, with
   participation of the open joint-stock company "Information
   Technologies and Communication Systems" (InfoTeCS JSC).  GOST R
   34.12-2015 was approved and introduced by Decree #749 of the Federal
   Agency on Technical Regulating and Metrology on June 19, 2015.

   Terms and concepts in the specification comply with the following
   international standards:

   *  ISO/IEC 10116 [ISO-IEC10116]

   *  series of standards ISO/IEC 18033 [ISO-IEC18033-1][ISO-IEC18033-3]

3.  Definitions and Notation

   The following terms and their corresponding definitions are used in
   the specification.

3.1.  Definitions

   encryption algorithm:  process that transforms plaintext into
      ciphertext (Clause 2.19 of [ISO-IEC18033-1])