---
name: "Crypt::DSA::Util"
section: "3pm"
platform: "linux"
package: "libcrypt-dsa-perl"
version: "1.19-1"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/Crypt::DSA::Util"
---

# Crypt::DSA::Util(3pm)

DSA Utility functions

## 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.