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add fp_rand() docs

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Steffen Jaeckel 2017-04-04 00:56:13 +02:00
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@ -279,6 +279,21 @@ void fp_init_copy(fp_int *a, fp_int *b)
This will initialize $a$ as a copy of $b$. Note that for compatibility with LibTomMath the function This will initialize $a$ as a copy of $b$. Note that for compatibility with LibTomMath the function
fp\_copy() is also provided. fp\_copy() is also provided.
\subsection{Initialization with a random value}
To initialize an integer with a random value of a specific length use the fp\_rand() function.
\index{fp\_rand}
\begin{verbatim}
void fp_rand(fp_int *a, int digits)
\end{verbatim}
This will initialize $a$ with $digits$ random digits.
\index{FP\_GEN\_RANDOM} \index{FP\_GEN\_RANDOM\_MAX}
The source of the random data is \textbf{arc4random()} on *BSD systems that provide this function
and the standard C function \textbf{rand()} on all other systems. It can be configured at compile time
by pre-defining \textbf{FP\_GEN\_RANDOM} and \textbf{FP\_GEN\_RANDOM\_MAX}.
\chapter{Arithmetic Operations} \chapter{Arithmetic Operations}
\section{Odds and Evens} \section{Odds and Evens}
To quickly and easily tell if an integer is zero, odd or even use the following functions. To quickly and easily tell if an integer is zero, odd or even use the following functions.