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craft.sty
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craft.sty
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\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{craft}[2022/09/08 Utils for illustrating the CRAFT cipher]
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% CRAFT LIBRARY FOR TIKZ %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
% Utilities for drawing CRAFT rounds and states %
% Author: Maria Eichlseder %
% Usage: \usepackage{craft} %
% Dependency: tikzlibrarycipher.code.tex %
% https://extgit.iaik.tugraz.at/meichlseder/tikz %
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%% PREREQUISITES %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\RequirePackage{amsmath,amssymb}
\RequirePackage{tikz}
\RequirePackage{xspace}
\usetikzlibrary{calc,cipher}
%%% GENERAL CRYPTO UTILS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\providecommand{\cipher}[1]{\textsf{#1}}
\providecommand{\SB}{\cipher{SB}\xspace}
\providecommand{\AC}{\cipher{AC}\xspace}
\providecommand{\ART}{\cipher{ART}\xspace}
\providecommand{\PN}{\cipher{PN}\xspace}
\providecommand{\MC}{\cipher{MC}\xspace}
\providecommand{\SubNibbles}{\cipher{SubNibbles}\xspace} % official name?
\providecommand{\AddConstant}{\cipher{AddConstant}\xspace} % official name?
\providecommand{\AddRoundTweakey}{\cipher{AddRoundTweakey}\xspace} % official name?
\providecommand{\PermuteNibbles}{\cipher{PermuteNibbles}\xspace}
\providecommand{\MixColumns}{\cipher{MixColumns}\xspace}
%%% COLORS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\colorlet{oper}{white}
%%% CRAFT UTILS & OPTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newcommand{\CRAFT}[1][]{\if\relax\detokenize{#1}\relax\cipher{CRAFT}\else\mbox{\cipher{CRAFT}-#1}\fi\xspace}
\providecommand{\stateScale}{.3}
\tikzset{
state/.style={inner sep=-.5pt},
stateopts/.style={scale=\stateScale},
cellopts/.style={font=\footnotesize},
box/.append style={fill=oper},
>=latex
}
%%% CRAFT ROUND FUNCTIONS %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\newcommand{\CraftInit}{
\coordinate (init); % beginning of current line
\CraftInitCoordinates
}
\newcommand{\CraftInitCoordinates}{
% called by CraftInit and CraftNewLine to initialize state coordinates based on (init)
\draw (init) coordinate (here); % current x-coordinate of state
\draw (here) coordinate (S)
+(0,.6) coordinate (lbl);
\draw (S.east) coordinate (Shere);
\draw (here) +(.75,0) coordinate(here);
\foreach \r/\offset in {0/.45,1/.15,2/-.15,3/-.45} {
\draw (here) + (0,\offset) coordinate (S\r);
}
\draw (S) +(-.25,-1) coordinate (Shook); % for \CraftNewLine
}
\newcommand{\CraftState}[2][]{
\draw (Shere.east) coordinate (Sprev);
\draw (S-|here) node[state] (Shere) {\State{#2}};
\draw[->] (Sprev) -- (Shere.west|-Sprev);
\draw (Shere|-lbl) node[above,inner sep=1pt] {#1};
}
\newcommand{\CraftStateNolink}[2][]{
\draw (S-|here) node[state] (Shere) {\State{#2}};
\draw (Shere.east) coordinate (Sprev);
\draw (Shere|-lbl) node[above,inner sep=1pt] {#1};
}
\newcommand{\CraftStateRowlink}[2][]{
\draw (S-|here) node[state] (Shere) {\State{#2}};
\draw (Shere.east) coordinate (Sprev);
\foreach \r in {0,...,3} {
\draw[->] (S\r prev) -- (S\r-|Shere.west);
}
\draw (Shere|-lbl) node[above,inner sep=1pt] {#1};
}
\newcommand{\CraftRound}[6][]{
% Craft round with Equivalent subTweaKey
% #1 = round number (optional)
% #2 = S (state)
% #3 = S after MixColumns
% #4 = Round Tweakey RT
% #5 = S after AddRoundTweakey
% #6 = S after PermuteNibbles
% S after SubCells is part of the next round or CraftFin
%
% round input:
\CraftStateNolink[$X_{#1}$]{#2}
% MixColumns
\draw (S0-|Shere.east) -- ++(.15,0) coordinate[xor,scale=.5] (S0xor1) -- ++(.30,0) coordinate[xor,scale=.5] (S0prev)
(S1-|Shere.east) -- ++(.30,0) coordinate[xor,scale=.5] (S1prev)
(S2-|Shere.east) coordinate (S2prev)
(S3-|Shere.east) coordinate (S3prev);
\draw[->] (S2-|S0xor1) coordinate[tee,scale=.5] -- (S0xor1);
\draw[->] (S3-|S1prev) coordinate[tee,scale=.5] -- (S1prev);
\draw[->] (S3-|S0prev) coordinate[tee,scale=.5] -- (S0prev);
\draw (here) +(1.9,0) coordinate(here);
\CraftStateRowlink[$Y_{#1}$]{#3}
% AddRoundTweakey:
\draw (here.east) ++(1.5,+1.5*\stateScale) coordinate[xor] (Txor);
\draw (Sprev) ++(1.5+\stateScale,0) coordinate (Tfin);
\draw[->,rounded corners=1pt] (Sprev) -- +(.5*\stateScale,0) |- (Txor);
\draw[->,rounded corners=1pt] (Txor) -- +(2.5*\stateScale,0) |- (Tfin);
\draw (Txor|-lbl) node[above,inner sep=1pt] {$\textit{RT}_{#1\%4}$};
\draw (Txor.east) coordinate (Shere);
\draw (Txor.center) ++(0,-2.5*\stateScale) node[state] (There) {\State{#4}};
\draw (There.north) -- (Txor);
\draw (here) +(3,0) coordinate(here);
\CraftStateNolink[$Z_{#1}$]{#5}
% ShiftRows:
\draw (here) +(0.9,0) coordinate(here);
\foreach \r/\rn in {0/3,1/2,2/1,3/0} {
\draw[->,rounded corners=1pt] (S\r-|Sprev) -- ++(.1,0) -- (S\rn-|here) -- ++(.15,0);
}
\draw (here) ++(.15,0) node[right,box,minimum height=1.2cm,minimum width=.42cm,font=\scriptsize,align=center] (Shere) {\tiny$\!\ggg\!\!1$\\\tiny$\pi$\\\tiny$\pi$\\\tiny$\!\lll\!\!1$};
\foreach \r in {0,...,3} { \draw (S\r-|Shere.east) coordinate(S\r prev); }
\draw (here) +(1.40,0) coordinate(here);
\CraftStateRowlink[$W_{#1}$]{#6}
% SubCells:
\draw (Shere) ++(1-.05,0) node[box,minimum height=1.2cm,minimum width=.42cm,font=\scriptsize,align=center] (Shere) {\SB\\\AC};
\draw (Sprev) -- (Shere);
\draw (here) +(2-.05,0) coordinate(here);
\draw[->] (Shere.east) -- +(.15+.035,0);
}
\newcommand{\CraftNewLine}[2][]{
% #1 = round number (optional)
% #2 = state after mixcols (repeated at beginning of next line)
% draw and connect final state
\CraftStateNolink[$X_{#1}$]{#2}
\draw (init) +(0,-2.0) coordinate (init);
\draw (Shere.east) coordinate (Send);
\draw (Shook) coordinate (Thook);
\CraftInitCoordinates{}{}
\draw[->,rounded corners=2pt] (Send) -- +(.25,0) |- (Thook) |- (init) -- +(.15,0);
}
\newcommand{\CraftFin}[2][]{
% #1 = round number (optional)
% #2 = final state
\CraftStateNolink[$X_{#1}$]{#2}
}
\endinput