Vertical separators in pchstack in cryptocode

If you don't want to draw the line manually (which requires determining the length) then you can put the procedures in two tabulars, and draw the relevant line for the longest tabular (here they are equally long so I picked the left line for the second tabular). This does mess up the space calculation for boxed but you can add a bit of extra space with \qquad or any other horizontal space command.

MWE:

\documentclass{report} \usepackage{cryptocode} \usepackage{mdframed} \begin{document} \begin{pchstack}[space=1em,center,boxed] \begin{tabular}{l} \procedure{$\mathsf{Left}$}{ \text{Hello,} }\end{tabular} \begin{tabular}{|l} \procedure{$\mathsf{Right}$}{ \text{Tex StackExchange} }\qquad\end{tabular} \end{pchstack} \end{document} 

Result:

Here is a way to do it with your code:

• set space=0em
• specify width for left procedure
• use \hspace{ }

However ...

\documentclass{report} \usepackage{cryptocode} \begin{document} \begin{pchstack}[space=0em,center,boxed]% changed \procedure[width=3cm]{$\mathsf{Left}$}{ % changed \text{Hello,} } \hspace{1cm} % new \procedure{}{ \rule{0.4pt}{1.5cm} } \procedure[linenumbering]{$\mathsf{Right}$}{ \text{Tex StackExchange} } \end{pchstack} \end{document} 

... you still need to readjust the length of the vertical rule. A more convenient way would be to:

• use vertical lines with the tabbing functionality (if available)
• use the built-in Tikz features

However, you'd probably need to wrap the right procdeure inside a bbrbox, which is a Tikz thingy, so it can be named, e.g. (box). IF you can switch off the frame, you could do sth. like \draw (box.north west) -- (box.south west); . However, this may need some realignments, or using the same approach for the left procedure.