Convert::PEM::CBC - Cipher Block Chaining Mode implementation |
new(%args)
encrypt($plaintext)
decrypt($ciphertext)
Convert::PEM::CBC - Cipher Block Chaining Mode implementation
use Convert::PEM::CBC; my $cbc = Convert::PEM::CBC->new( Cipher => 'Crypt::DES_EDE3', Passphrase => 'foo' );
$cbc->encrypt($plaintext);
Convert::PEM::CBC implements the CBC (Cipher Block Chaining) mode for encryption/decryption ciphers; the CBC is designed for compatability with OpenSSL and may not be compatible with other implementations (such as SSH).
new(%args)
Creates a new Convert::PEM::CBC object and initializes it. Returns the new object.
%args can contain:
This argument is mandatory.
Because of this ``munging'', this argument can be any length (even an empty string).
If you give the Cipher argument an object, this argument is ignored. If the Cipher argument is a cipher class, either this argument or Key must be provided.
As with the Passphrase argument, if you give the Cipher argument an already-constructed cipher object, this argument is ignored. If the Cipher argument is a cipher class, either this argument or Passphrase must be provided.
This argument is optional; if not provided, a random IV will be generated. Obviously, if you're decrypting data, you should provide this argument, because your IV should match the IV used to encrypt the data.
encrypt($plaintext)
Encrypts the plaintext $plaintext using the underlying cipher implementation in CBC mode, and returns the ciphertext.
If any errors occur, returns undef, and you should check the errstr method to find out what went wrong.
decrypt($ciphertext)
Decrypts the ciphertext $ciphertext using the underlying cipher implementation in CBC mode, and returns the plaintext.
If any errors occur, returns undef, and you should check the errstr method to find out what went wrong.
Returns the current initialization vector. One use for this might be to grab the initial value of the IV if it's created randomly (ie. you haven't provided an IV argument to new):
my $cbc = Convert::PEM::CBC->new( Cipher => $cipher ); my $iv = $cbc->iv; ## Generated randomly in 'new'.
Convert::PEM uses this to write the IV to the PEM file when encrypting, so that it can be known when trying to decrypt the file.
Returns the value of the last error that occurred. This should only be considered meaningful when you've received undef from one of the functions above; in all other cases its relevance is undefined.
Please see the Convert::PEM manpage for author, copyright, and license information.
Convert::PEM::CBC - Cipher Block Chaining Mode implementation |