# phpman > perldoc > String::CRC32

## NAME
    [String::CRC32](https://www.chedong.com/phpMan.php/perldoc/String%3A%3ACRC32/markdown) - Perl interface for cyclic redundancy check generation

## SYNOPSIS
        use [String::CRC32](https://www.chedong.com/phpMan.php/perldoc/String%3A%3ACRC32/markdown);

        $crc = crc32("some string");
        $crc = crc32("some string", initvalue);

        $somestring = "some string";
        $crc = crc32($somestring);
        printf "%08x\n", $crc;

        open my $fh, '<', 'location/of/some.file' or die $!;
        binmode $fh;
        $crc = crc32($fh);
        close $fh;

## DESCRIPTION
    The CRC32 module calculates CRC sums of 32 bit lengths as integers. It generates the same CRC
    values as ZMODEM, PKZIP, PICCHECK and many others.

    Despite its name, this module is able to compute the checksum of files as well as strings.

## EXAMPLES
        $crc = crc32("some string");

    results in the same as

        $crc = crc32(" string", crc32("some"));

    This is useful for subsequent CRC checking of substrings.

    You may even check files:

        open my $fh, '<', 'location/of/some.file' or die $!;
        binmode $fh;
        $crc = crc32($fh);
        close $fh;

    A init value may also have been supplied in the above example.

## AUTHOR
    Soenke J. Peters <<peters__perl@opcenter.de>>

    Current maintainer: LEEJO

    Address bug reports and comments to: <<https://github.com/leejo/string-crc32/issues>>

## LICENSE
    CRC algorithm code taken from CRC-32 by Craig Bruce. The module stuff is inspired by a similar
    perl module called [String::CRC](https://www.chedong.com/phpMan.php/perldoc/String%3A%3ACRC/markdown) by David Sharnoff & Matthew Dillon. Horst Fickenscher told me
    that it could be useful to supply an init value to the crc checking function and so I included
    this possibility.

    The author of this package disclaims all copyrights and releases it into the public domain.