Crypt::DSA::Key(3) User Contributed Perl Documentation Crypt::DSA::Key(3)NAMECrypt::DSA::Key - DSA key
SYNOPSIS
use Crypt::DSA::Key;
my $key = Crypt::DSA::Key->new;
$key->p($p);
DESCRIPTIONCrypt::DSA::Key contains a DSA key, both the public and private
portions. Subclasses of Crypt::DSA::Key implement read and write
methods, such that you can store DSA keys on disk, and read them back
into your application.
USAGE
Any of the key attributes can be accessed through combination get/set
methods. The key attributes are: p, q, g, priv_key, and pub_key. For
example:
$key->p($p);
my $p2 = $key->p;
$key = Crypt::DSA::Key->new(%arg)
Creates a new (empty) key object. All of the attributes are initialized
to 0.
Alternately, if you provide the Filename parameter (see below), the key
will be read in from disk. If you provide the Type parameter (mandatory
if Filename is provided), be aware that your key will actually be
blessed into a subclass of Crypt::DSA::Key. Specifically, it will be
the class implementing the specific read functionality for that type,
eg. Crypt::DSA::Key::PEM.
Returns the key on success, "undef" otherwise. (See Password for one
reason why new might return "undef").
%arg can contain:
· Type
The type of file where the key is stored. Currently the only option
is PEM, which indicates a PEM file (optionally encrypted,
ASN.1-encoded object). Support for reading/writing PEM files comes
from Convert::PEM; if you don't have this module installed, the new
method will die.
This argument is mandatory, if you're either reading the file from
disk (ie. you provide a Filename argument) or you've specified the
Content argument.
· Filename
The location of the file from which you'd like to read the key.
Requires a Type argument so the decoder knows what type of file it
is. You can't specify Content and Filename at the same time.
· Content
The serialized version of the key. Requires a Type argument so the
decoder knows how to decode it. You can't specify Content and
Filename at the same time.
· Password
If your key file is encrypted, you'll need to supply a passphrase
to decrypt it. You can do that here.
If your passphrase is incorrect, new will return "undef".
$key->write(%arg)
Writes a key (optionally) to disk, using a format that you define with
the Type parameter.
If your $key object has a defined priv_key (private key portion), the
key will be written as a DSA private key object; otherwise, it will be
written out as a public key. Note that not all serialization mechanisms
can produce public keys in this version--currently, only PEM public
keys are supported.
%arg can include:
· Type
The type of file format that you wish to write. PEM is one example
(in fact, currently, it's the only example).
This argument is mandatory, unless your $key object is already
blessed into a subclass (eg. Crypt::DSA::Key::PEM), and you wish to
write the file using the same subclass.
· Filename
The location of the file on disk where you want the key file to be
written.
· Password
If you want the key file to be encrypted, provide this argument,
and the ASN.1-encoded string will be encrypted using the passphrase
as a key.
$key->size
Returns the size of the key, in bits. This is actually the number of
bits in the large prime p.
AUTHOR & COPYRIGHTS
Please see the Crypt::DSA manpage for author, copyright, and license
information.
perl v5.14.1 2011-06-17 Crypt::DSA::Key(3)
