# Crypt::DSA::Util - phpMan

## NAME
    [Crypt::DSA::Util] - DSA Utility functions

## SYNOPSIS
        use [Crypt::DSA::Util] qw( func1 func2 ... );

## DESCRIPTION
    *[Crypt::DSA::Util]* contains a set of exportable utility functions used
    through the *[Crypt::DSA]* set of libraries.

  bitsize($n)
    Returns the number of bits in the *[Math::Pari]* integer object *$n*.

  bin2mp($string)
    Given a string *$string* of any length, treats the string as a base-256
    representation of an integer, and returns that integer, a *[Math::Pari]*
    object.

  mp2bin($int)
    Given a biginteger *$int* (a *[Math::Pari]* object), linearizes the
    integer into an octet string, and returns the octet string.

  mod_exp($a, $exp, $n)
    Computes $a ^ $exp mod $n and returns the value. The calculations are
    done using *[Math::Pari]*, and the return value is a *[Math::Pari]* object.

  mod_inverse($a, $n)
    Computes the multiplicative inverse of $a mod $n and returns the value.
    The calculations are done using *[Math::Pari]*, and the return value is a
    *[Math::Pari]* object.

AUTHOR & COPYRIGHTS
    Please see the [Crypt::DSA] manpage for author, copyright, and license
    information.