\documentclass[a4paper,fleqn,10pt,oneside]{book}
\usepackage{Settings/IUT-Thesis}
%-----------------------------
% دستورهای مورد نیاز را در این قسمت اضافه نمایید:
\allowdisplaybreaks
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\begin{document}

\pagestyle{plain}
\pagenumbering{adadi}
\setcounter{page}{2}


\renewcommand{\algorithmicrequire}{\textbf{function}}
\renewcommand{\algorithmicensure}{\textbf{end function}}


\begin{algorithm}
\onehalfspacing
\caption{Key Generation} \label{alg1}
%\caption{\rmfamily Key Generation} \label{alg1}
\begin{latin}
\begin{algorithmic}[1]
\REQUIRE RSA Key Generation $(p,q)$ \\
\STATE P\textsubscript{A}  Choose two pair of large prime $(p_1,q_1)$ , $(p_2,q_2)$ \\
\RETURN{$(K\textsubscript{\textit{pu1A}},K\textsubscript{\textit{pr1A}})$  , $(K\textsubscript{\textit{pu2A}},K\textsubscript{\textit{pr2A}})$}
\ENSURE 
\end{algorithmic}
\end{latin}
\end{algorithm}


\end{document}