The SM4 Blockcipher Algorithm And Its Modes Of Operations
draft-ribose-cfrg-sm4-10

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Replaces draft-crypto-sm4
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Internet Research Task Force                                      R. Tse
Internet-Draft                                                    Ribose
Intended status: Informational                                   W. Wong
Expires: October 23, 2018                   Hang Seng Management College
                                                           M-J. Saarinen
                                                  Independent Consultant
                                                          April 21, 2018

       The SM4 Blockcipher Algorithm And Its Modes Of Operations
                        draft-ribose-cfrg-sm4-10

Abstract

   This document describes the SM4 symmetric blockcipher algorithm
   published as GB/T 32907-2016 by the State Cryptography Administration
   of China (SCA).

   This document is a product of the Crypto Forum Research Group (CFRG).

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   This Internet-Draft will expire on October 23, 2018.

Copyright Notice

   Copyright (c) 2018 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
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   (https://trustee.ietf.org/license-info) in effect on the date of
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Tse, et al.             Expires October 23, 2018                [Page 1]
Internet-Draft          SM4 Blockcipher Algorithm             April 2018

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.1.  Purpose . . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.2.  History . . . . . . . . . . . . . . . . . . . . . . . . .   4
   2.  Terms and Definitions . . . . . . . . . . . . . . . . . . . .   5
   3.  Symbols And Abbreviations . . . . . . . . . . . . . . . . . .   6
   4.  Compute Structure . . . . . . . . . . . . . . . . . . . . . .   6
   5.  Key And Key Parameters  . . . . . . . . . . . . . . . . . . .   7
   6.  Functions . . . . . . . . . . . . . . . . . . . . . . . . . .   7
     6.1.  Round Function F  . . . . . . . . . . . . . . . . . . . .   7
     6.2.  Permutations T and T' . . . . . . . . . . . . . . . . . .   7
       6.2.1.  Nonlinear Transformation tau  . . . . . . . . . . . .   8
       6.2.2.  Linear Transformations L and L' . . . . . . . . . . .   8
       6.2.3.  S-box S . . . . . . . . . . . . . . . . . . . . . . .   8
   7.  Algorithm . . . . . . . . . . . . . . . . . . . . . . . . . .   9
     7.1.  Encryption  . . . . . . . . . . . . . . . . . . . . . . .   9
     7.2.  Decryption  . . . . . . . . . . . . . . . . . . . . . . .  12
     7.3.  Key Schedule  . . . . . . . . . . . . . . . . . . . . . .  12
       7.3.1.  Family Key FK . . . . . . . . . . . . . . . . . . . .  13
       7.3.2.  Constant Key CK . . . . . . . . . . . . . . . . . . .  13
   8.  Modes of Operation  . . . . . . . . . . . . . . . . . . . . .  14
     8.1.  Variables And Primitives  . . . . . . . . . . . . . . . .  14
     8.2.  Initialization Vectors  . . . . . . . . . . . . . . . . .  15
     8.3.  SM4-ECB . . . . . . . . . . . . . . . . . . . . . . . . .  15
       8.3.1.  SM4-ECB Encryption  . . . . . . . . . . . . . . . . .  15
       8.3.2.  SM4-ECB Decryption  . . . . . . . . . . . . . . . . .  16
     8.4.  SM4-CBC . . . . . . . . . . . . . . . . . . . . . . . . .  16
       8.4.1.  SM4-CBC Encryption  . . . . . . . . . . . . . . . . .  17
       8.4.2.  SM4-CBC Decryption  . . . . . . . . . . . . . . . . .  17
     8.5.  SM4-CFB . . . . . . . . . . . . . . . . . . . . . . . . .  18
       8.5.1.  SM4-CFB Variants  . . . . . . . . . . . . . . . . . .  18
       8.5.2.  SM4-CFB Encryption  . . . . . . . . . . . . . . . . .  19
       8.5.3.  SM4-CFB Decryption  . . . . . . . . . . . . . . . . .  19
     8.6.  SM4-OFB . . . . . . . . . . . . . . . . . . . . . . . . .  20
       8.6.1.  SM4-OFB Encryption  . . . . . . . . . . . . . . . . .  20
       8.6.2.  SM4-OFB Decryption  . . . . . . . . . . . . . . . . .  21
     8.7.  SM4-CTR . . . . . . . . . . . . . . . . . . . . . . . . .  22
       8.7.1.  SM4-CTR Encryption  . . . . . . . . . . . . . . . . .  22
       8.7.2.  SM4-CTR Decryption  . . . . . . . . . . . . . . . . .  23
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