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Crypt::OpenPGP::MDC(3)User Contributed Perl DocumentatioCrypt::OpenPGP::MDC(3)

NAME
       Crypt::OpenPGP::MDC - MDC (modification detection code) packet

SYNOPSIS
	   use Crypt::OpenPGP::MDC;

	   my $mdc = Crypt::OpenPGP::MDC->new( Data => 'foobar'	);
	   my $digest =	$mdc->digest;
	   my $serialized = $mdc->save;

DESCRIPTION
       Crypt::OpenPGP::MDC is a	PGP MDC	(modification detection	code) packet.
       Such a packet is	used alongside Encrypted-MDC data packets so that
       modifications to	the ciphertext can be detected.	The MDC	packet
       contains	a "SHA-1" digest of the	plaintext for comparison with the
       decrypted plaintext.

       You generally will never	need to	construct a Crypt::OpenPGP::MDC	packet
       yourself; usage is by the Crypt::OpenPGP::Ciphertext object.

USAGE
   Crypt::OpenPGP::MDC->new( [ Data => $data ] )
       Creates a new MDC packet	object and returns that	object.	If you do not
       supply any data $data, the object is created empty; this	is used, for
       example,	in parse (below), to create an empty packet which is then
       filled from the data in the buffer.

       If you wish to initialize a non-empty object, supply new	with the Data
       parameter along with a value $data. $data should	contain	the plaintext
       prefix (length =	cipher blocksize + 2), the actual plaintext, and two
       octets corresponding to the hex digits 0xd3 and 0x14.

   $mdc->save
       Returns the text	of the MDC packet; this	is the digest of the data
       passed to new (above) as	$data, for example.

   Crypt::OpenPGP::MDC->parse($buffer)
       Given $buffer, a	Crypt::OpenPGP::Buffer object holding (or with offset
       pointing	to) an MDC packet, returns a new <Crypt::OpenPGP::MDC> object,
       initialized with	the MDC	data in	the buffer.

   $mdc->digest
       Returns the MDC digest data (eg.	the string passed as $data to new,
       above).

AUTHOR & COPYRIGHTS
       Please see the Crypt::OpenPGP manpage for author, copyright, and
       license information.

perl v5.24.1			  2009-12-10		Crypt::OpenPGP::MDC(3)

NAME | SYNOPSIS | DESCRIPTION | USAGE | AUTHOR & COPYRIGHTS

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