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\documentclass[a4paper,12pt]{article}
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\usepackage[utf8]{inputenc}
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\usepackage{titlesec}
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\usepackage{tabularx}
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\usepackage{lastpage}
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\usepackage{tocloft}
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\usepackage[us]{datetime}
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\usepackage{hyperref}
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\hypersetup{colorlinks=true,linkcolor=black,urlcolor=blue}
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\usepackage[top=2.5cm, bottom=2.5cm, left=2.5cm, right=2cm]{geometry}
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\usepackage{fancyhdr}
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\pagestyle{fancy}
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\lhead{GOST 28147-89 Core, rev. \currentRevision}
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\rhead{\releaseDate}
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\cfoot{\thepage\ of \pageref{LastPage}}
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\renewcommand\cftsecdotsep{\cftdotsep}
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\newcommand{\currentRevision}{0.2}
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\newcommand{\releaseDate}{March 31, 2014}
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\begin{document}
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% Title
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\begin{titlepage}
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\begin{flushright}
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\vspace*{4cm}
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\Huge
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\textbf{GOST 28147-89}\\IP Core
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\vspace{4cm}
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\large
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Author: Kirill Fomichev\\
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\textsl{fanatid@ya.ru}
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\vspace{4cm}
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\textbf{Revision \currentRevision\\\releaseDate}
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\end{flushright}
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\end{titlepage}
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% Revision history
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\begin{flushright}
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\Large
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\textbf{Revision History}
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\normalsize
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\end{flushright}
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\begin{flushleft}
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{\renewcommand{\arraystretch}{1.5}
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\begin{tabularx}{\textwidth}{|l|l|l|X|}
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\hline
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\textbf{Rev.} & \textbf{Date} & \textbf{Author} & \textbf{Description}\\
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\hline
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0.1 & March 10, 2014 & Kirill Fomichev & Initial Release\\
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\hline
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0.2 & March 31, 2014 & Kirill Fomichev & Add bidirectional ECB and CFB modules\\
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\hline
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\end{tabularx}}
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\end{flushleft}
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% Contents
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\newpage
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\tableofcontents
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% Introduction
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\newpage
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\section{Introduction}
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\subsection{About GOST 28147-89}
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\paragraph{}
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The \textsl{GOST block cipher}, defined in standard \textsl{GOST 28147-89},
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is a Soviet and Russian government standard symmetric key block cipher.
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Developed in the 1970s, the standard has been marked "Top Secret" and
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the downgraded to "Secret" in 1990. Shortly after the dissolution of the USSR,
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it was declassified and it was released to the public in 1994.
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\paragraph{}
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GOST have a 64-bit block size and a key length of 256 bits.
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It's S-Boxes can be secret, and they contain about 354($log_2(16!^8)$) bits of
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secret information, so the effective key size can be increased to 610 bits;
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however, a chosen-key attack can recover the contents of the S-Boxes
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in approximately $2^{32}$ encryptions.
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\subsection{This roject}
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\paragraph{}
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This project has implements \textsl{GOST block cipher} in three modes:
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electronic codebook (ECB), cipher feedback (CFB) and message authentication code (MAC).
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\paragraph{}
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All files licensed under \textsl{BSD license}.
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% Interface
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\newpage
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\section{Interface}
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\paragraph{}
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ECB mode\\
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{\renewcommand{\arraystretch}{1.2}
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\begin{tabularx}{\textwidth}{l|l l X}
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\hline
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Signal name & Width & In/Out & Description\\
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\hline
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\textsl{clk} & 1 & In & Clock\\
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\textsl{reset} & 1 & In & Terminate current encryption/decryption process \\
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\textsl{mode} & 1 & In & Decryption when mode equal 1, otherwise encryption\\
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\textsl{load\_data} & 1 & In & Start of encryption/decryption \\
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\textsl{sbox} & 512 & In & S-Box \\
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\textsl{key} & 256 & In & Key \\
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\textsl{in} & 64 & In & Plain text/Cipher text \\
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\textsl{out} & 64 & Out & Cipher text/Plain text. Results available after 34 clock cycles. \\
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\textsl{busy} & 1 & Out & Status flag, triggered to zero after finished encryption/decryption \\
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\hline
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\end{tabularx}}
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\paragraph{}
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ECB mode with pipeline\\
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{\renewcommand{\arraystretch}{1.2}
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\begin{tabularx}{\textwidth}{l|l l X}
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\hline
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Signal name & Width & In/Out & Description\\
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\hline
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\textsl{clk} & 1 & In & Clock\\
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\textsl{sbox} & 512 & In & S-Box \\
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\textsl{key} & 256 & In & Key \\
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\textsl{in} & 64 & In & Plain text/Cipher text \\
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\textsl{out} & 64 & Out & Cipher text/Plain text. Results available after 32 clock cycles. \\
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\hline
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\end{tabularx}}
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\paragraph{}
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CFB mode\\
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{\renewcommand{\arraystretch}{1.2}
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\begin{tabularx}{\textwidth}{l|l l X}
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\hline
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Signal name & Width & In/Out & Description\\
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\hline
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\textsl{clk} & 1 & In & Clock\\
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\textsl{reset} & 1 & In & Terminate current encryption/decryption process and load gamma from \textsl{in} \\
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\textsl{mode} & 1 & In & Decryption when mode equal 1, otherwise encryption\\
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\textsl{load\_data} & 1 & In & Start of encryption/decryption \\
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\textsl{sbox} & 512 & In & S-Box \\
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\textsl{key} & 256 & In & Key \\
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\textsl{in} & 64 & In & Gamma/Plain text/Cipher text \\
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\textsl{out} & 64 & Out & Cipher text/Plain text. Results available after 35 clock cycles. \\
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\textsl{busy} & 1 & Out & Status flag, triggered to zero after finished encryption/decryption \\
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\hline
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\end{tabularx}}
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\paragraph{}
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MAC mode\\
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{\renewcommand{\arraystretch}{1.2}
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\begin{tabularx}{\textwidth}{l|l l X}
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\hline
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Signal name & Width & In/Out & Description\\
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\hline
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\textsl{clk} & 1 & In & Clock\\
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\textsl{reset} & 1 & In & Drop current mac \\
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\textsl{load\_data} & 1 & In & Start calculate mac \\
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\textsl{sbox} & 512 & In & S-Box \\
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\textsl{key} & 256 & In & Key \\
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\textsl{in} & 64 & In & Plain text \\
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\textsl{out} & 32 & Out & MAC, available after 18 clock cycles. \\
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\textsl{busy} & 1 & Out & Status flag, triggered to zero after finished processing\\
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\hline
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\end{tabularx}}
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% Testbench
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\newpage
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\section{Testbench}
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\paragraph{}
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Makefile run simulation using
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\href{http://iverilog.icarus.com/}{Icarus Verilog}
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in testbench folder. You can see simulation results in
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\href{http://gtkwave.sourceforge.net/}{GTKWave}.
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\begin{flushleft}
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{\renewcommand{\arraystretch}{1.5}
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\begin{tabularx}{\textwidth}{l|X}
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\hline
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\textsl{File name} & \textsl{The module being tested}\\
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\hline
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gost89\_ecb\_tb.v & ECB encryption and decryption\\
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\hline
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gost89\_pipelined\_ecb\_tb.v & Pipelined ECB encryption and decryption\\
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\hline
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gost89\_cfb\_tb.v & CFB encryption and decryption\\
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\hline
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gost89\_mac\_tb.v & MAC mode\\
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\hline
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\end{tabularx}}
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\end{flushleft}
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% References
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\newpage
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\section{References}
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\begin{enumerate}
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\item GOST block cipher,\\
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\url{http://en.wikipedia.org/wiki/GOST_(block_cipher)}
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\item RFC 4357: Additional Cryptographic Algorithms for Use with GOST\\
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\url{http://tools.ietf.org/html/rfc4357}
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\item RFC 5830: GOST 28147-89 encryption, decryption and MAC algorithms\\
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\url{http://tools.ietf.org/html/rfc5830}
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\item Schneier, Bruce (1996). Applied cryptography: protocols, algorithms, and source code in C
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\end{enumerate}
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\end{document}
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