crc(1) [bsd man page]

CRC(1)							      General Commands Manual							    CRC(1)

NAME

       crc - checksum files

SYNOPSIS

       crc file ...

DESCRIPTION

       For  each  file,  crc calculates and prints a 32-bit CRC, the byte count, and the file name.  It is typically used to validate files trans-
       ferred between different systems, and is useful in detecting subtle disk corruption.  Crc uses a checksum compatible with the  DOS  version
       of  crc,  the 32 bit CRC used by PKZIP version 0.9, as well as the "crc" command in ZCOMM and Professional-YAM (high reliability communica-
       tions programs).

       The 32-bit CRC used is the frame check sequence in ADCCP (ANSI X3.66, also known as FIPS PUB 71 and  FED-STD-1003,  the	U.S.  versions	of
       CCITT's X.25 link-level protocol).

       32 bit CRC code courtesy Gary S. Brown.

BUGS

       Although extremely unlikely, files with different data may still produce the same crc value.

SEE ALSO

       chek(1), undos(OMEN), todos(OMEN), tocpm(OMEN), sum(1), wc(1).

								       OMEN								    CRC(1)

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

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 v5.14.2							    2011-11-12							  Digest::CRC(3pm)