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.\" ========================================================================
.\"
.IX Title "Digest::CRC 3pm"
.TH Digest::CRC 3pm "2020-11-09" "perl v5.32.0" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH "NAME"
Digest::CRC \- Generic CRC functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\&  # 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;
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The \fBDigest::CRC\fR module calculates \s-1CRC\s0 sums of all sorts.
It contains wrapper functions with the correct parameters for CRC-CCITT,
\&\s-1CRC\-16, CRC\-32\s0 and \s-1CRC\-64,\s0 as well as the \s-1CRC\s0 used in OpenPGP's
ASCII-armored checksum.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
https://tools.ietf.org/html/rfc4880#section\-6
.SH "AUTHOR"
.IX Header "AUTHOR"
Oliver Maul, oli@42.nu
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
\&\s-1CRC\s0 algorithm code taken from \*(L"A \s-1PAINLESS GUIDE TO CRC ERROR DETECTION\s0
 \s-1ALGORITHMS\*(R".\s0
.PP
The author of this package disclaims all copyrights and 
releases it into the public domain.