gpg2paper.tex

\documentclass{article}

\usepackage{float}
\usepackage{graphicx}
\usepackage{pgffor}
\usepackage{blindtext}
\usepackage{subcaption}
\usepackage[a4paper, margin=0.2in]{geometry}

\providecommand{\gptitle}{Content Description}
\providecommand{\gpkeyfinger}{}
\providecommand{\gpfile}{}

\title{\gptitle\\\gpkeyfinger}
\date{\today}

\newcommand\gpgtopng{
  \immediate\write18{cat \gpfile | base64 > G2PTEMP}
  \immediate\write18{split G2PTEMP -n 4 G2PIMG}
  \immediate\write18{for f in G2PIMG*; do cat $f | qrencode -l L -o /tmp/$f.png; done}
  \immediate\write18{rm G2PIMG* G2PTEMP}
}

\gpgtopng

\begin{document}

\maketitle

\begin{figure}[H]
  \centering
  \foreach \l in {a, ..., b} {
    \begin{subfigure}{0.4\textwidth}
      \centering
      \includegraphics[width=\textwidth]{/tmp/G2PIMGa\l.png}
      \caption{}
    \end{subfigure}%
  }

  \foreach \l in {c, ..., d} {
    \begin{subfigure}{0.4\textwidth}
      \centering
      \includegraphics[width=1.0\textwidth]{/tmp/G2PIMGa\l.png}
      \caption{}
    \end{subfigure}%
  }

\end{figure}

\end{document}