ABC STREAM CIPHER VERSION 3
    C REFERENCE IMPLEMENTATION FOR ESTREAM PERFORMANCE TESTING FRAMEWORK

PROJECT STRUCTURE

    Folders and files in main project tree are organized as follows:

    README            - this file
    Makefile          - Makefile
    ecrypt-sync.h     - ECRYPT interface declarations
    abc.h             - declarations of ABC constants
    abc-tables.h      - predefined optimization tables
    abc.c             - core ABC routines

VARYING IMPLEMENTATION PARAMETERS

    Implementation memory consumption and therefore speed can be varied at
    compile time by ECRYPT_VARIANT parameter. Specifically, ECRYPT_VARIANT
    controls optimization window size and cycle unroll depth in ABC core
    code. Possible values for ECRYPT_VARIANT are defined in the table below.

    ECRYPT_VARIANT   Window size    Unroll depth
    1                12-12-8        16
    2                8              16
    3                8              8
    4                8              4
    5                4              16
    6                4              8
    7                4              4
    8                2              8
    9                2              4
    10               1              4

LEGAL NOTICE

    The ABC stream cipher is copyright (C) Vladimir Anashin, Andrey
    Bogdanov and Ilya Kizhvatov.

    The authors allow free usage of the ABC stream cipher design for any
    non-commercial or commercial purposes provided each of the following
    holds:

    1. The original ABC stream cipher design is not modified in any way.

    2. The name "ABC stream cipher" is clearly specified.

    3. The names of the ABC stream cipher inventors (Vladimir Anashin, Andrey
       Bogdanov, Ilya Kizhvatov) are clearly specified.

    ABC reference implementation is provided "as is" without any express or
    implied warranty. The authors are not in any way liable for any use of
    this software.

CONTACT

    Vladimir Anashin, Ilya Kizhvatov
      {anashin, ilya.kizhvatov}@rsuh.ru
      Faculty of Information Security
      Institute for Information Sciences and Security Technologies
      Russian State University for the Humanities
      Kirovogradskaya Str. 25/2, 117534 Moscow, Russia

    Andrey Bogdanov
      abogdanov@escrypt.com
      escrypt GmbH - Embedded Security
      Lise-Meitner-Allee 4, D-44801 Bochum, Germany