digest::crc(3) [osx man page]

Digest::CRC(3)						User Contributed Perl Documentation					    Digest::CRC(3)

NAME

       Digest::CRC - Generic CRC functions

SYNOPSIS

	 # Functional style

	 use Digest::CRC qw(crc64 crc32 crc16 crcccitt crc crc8 crcopenpgparmor);
	 $crc = crc64("123456789");
	 $crc = crc32("123456789");
	 $crc = crc16("123456789");
	 $crc = crcccitt("123456789");
	 $crc = crc8("123456789");
	 $crc = crcopenpgparmor("123456789");

	 $crc = crc($input,$width,$init,$xorout,$refout,$poly,$refin,$cont);

	 # add data to existing

	 $crc = crc32("ABCD", $crc);

	 # OO style
	 use Digest::CRC;

	 $ctx = Digest::CRC->new(type=>"crc16");
	 $ctx = Digest::CRC->new(width=>16, init=>0x2345, xorout=>0x0000,
				 refout=>1, poly=>0x8005, refin=>1, cont=>1);

	 $ctx->add($data);
	 $ctx->addfile(*FILE);

	 $digest = $ctx->digest;
	 $digest = $ctx->hexdigest;
	 $digest = $ctx->b64digest;

DESCRIPTION

       The Digest::CRC module calculates CRC sums of all sorts.  It contains wrapper functions with the correct parameters for CRC-CCITT, CRC-16,
       CRC-32 and CRC-64, as well as the CRC used in OpenPGP's ASCII-armored checksum.

SEE ALSO

       https://tools.ietf.org/html/rfc4880#section-6

AUTHOR

       Oliver Maul, oli@42.nu

COPYRIGHT

       CRC algorithm code taken from "A PAINLESS GUIDE TO CRC ERROR DETECTION
	ALGORITHMS".

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

perl v5.16.2							    2013-08-25							    Digest::CRC(3)

CRC32(3)						User Contributed Perl Documentation						  CRC32(3)

NAME

       String::CRC32 - Perl interface for cyclic redundency check generation

SYNOPSIS

	   use String::CRC32;

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

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

	   open(SOMEFILE, "location/of/some.file");
	   $crc = crc32(*SOMEFILE);
	   close(SOMEFILE);

DESCRIPTION

       The CRC32 module calculates CRC sums of 32 bit lenghts.	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(SOMEFILE, "location/of/some.file");
	   $crc = crc32(*SOMEFILE);
	   close(SOMEFILE);

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

AUTHOR

       Soenke J. Peters <peters__perl@opcenter.de>

       Please be so kind as to report any bugs/suggestions to the above address.

COPYRIGHT

       CRC algorithm code taken from CRC-32 by Craig Bruce.  The module stuff is inspired by a similar perl module called String::CRC 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.

perl v5.16.3							    2005-04-04								  CRC32(3)