Сергей Романов > Crypt-OpenPGP-1.12 > Crypt::OpenPGP::Cipher



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Crypt::OpenPGP::Cipher - PGP symmetric cipher factory


    use Crypt::OpenPGP::Cipher;

    my $alg = 'Rijndael';
    my $cipher = Crypt::OpenPGP::Cipher->new( $alg );

    my $plaintext = 'foo bar';
    my $ct = $cipher->encrypt($plaintext);
    my $pt = $cipher->decrypt($ct);


Crypt::OpenPGP::Cipher is a factory class for PGP symmetric ciphers. All cipher objects are subclasses of this class and share a common interface; when creating a new cipher object, the object is blessed into the subclass to take on algorithm-specific functionality.

A Crypt::OpenPGP::Cipher object is a wrapper around a Crypt::OpenPGP::CFB object, which in turn wraps around the actual cipher implementation (eg. Crypt::Blowfish for a Blowfish cipher). This allows all ciphers to share a common interface and a simple instantiation method.



Creates a new symmetric cipher object of type $cipher; $cipher can be either the name of a cipher (in Crypt::OpenPGP parlance) or the numeric ID of the cipher (as defined in the OpenPGP RFC). Using a cipher name is recommended, for the simple reason that it is easier to understand quickly (not everyone knows the cipher IDs).

Valid cipher names are: IDEA, DES3, Blowfish, Rijndael, Rijndael192, Rijndael256, Twofish, and CAST5.

Returns the new cipher object on success. On failure returns undef; the caller should check for failure and call the class method errstr if a failure occurs. A typical reason this might happen is an unsupported cipher name or ID.


Encrypts the plaintext $plaintext and returns the encrypted text (ie. ciphertext). The encryption is done in CFB mode using the underlying cipher implementation.


Decrypts the ciphertext $ciphertext and returns the plaintext. The decryption is done in CFB mode using the underlying cipher implementation.


Returns the name of the cipher algorithm (as listed above in new).


Returns the numeric ID of the cipher algorithm.


Returns the blocksize of the cipher algorithm (in bytes).


Returns the keysize of the cipher algorithm (in bytes).


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

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