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.TH DES 3 "2000-12-04" "perl v5.8.0" "User Contributed Perl Documentation"
Crypt::DES \- Perl DES encryption module
The module implements the Crypt::CBC interface,
which has the following methods
.IP "blocksize =item keysize =item encrypt =item decrypt" 4
.IX Item "blocksize =item keysize =item encrypt =item decrypt"
Returns the size (in bytes) of the block cipher.
Returns the size (in bytes) of the key. Optimal size is 8 bytes.
\& my $cipher = new Crypt::DES $key;
This creates a new Crypt::DES BlockCipher object, using \f(CW$key\fR,
where \f(CW$key\fR is a key of \f(CW\*(C`keysize()\*(C'\fR bytes.
\& my $cipher = new Crypt::DES $key;
\& my $ciphertext = $cipher->encrypt($plaintext);
This function encrypts \f(CW$plaintext\fR and returns the \f(CW$ciphertext\fR
where \f(CW$plaintext\fR and \f(CW$ciphertext\fR should be of \f(CW\*(C`blocksize()\*(C'\fR bytes.
\& my $cipher = new Crypt::DES $key;
\& my $plaintext = $cipher->decrypt($ciphertext);
This function decrypts \f(CW$ciphertext\fR and returns the \f(CW$plaintext\fR
where \f(CW$plaintext\fR and \f(CW$ciphertext\fR should be of \f(CW\*(C`blocksize()\*(C'\fR bytes.
\& my $key = pack("H16", "0123456789ABCDEF");
\& my $cipher = new Crypt::DES $key;
\& my $ciphertext = $cipher->encrypt("plaintex"); # NB - 8 bytes
\& print unpack("H16", $ciphertext), "\en";
Do note that \s-1DES\s0 only uses 8 byte keys and only works on 8 byte data
blocks. If you're intending to encrypt larger blocks or entire files,
please use Crypt::CBC in conjunction with this module. See the
Crypt::CBC documentation for proper syntax and use.
Also note that the \s-1DES\s0 algorithm is, by today's standard, weak
encryption. Crypt::Blowfish is highly recommended if you're
interested in using strong encryption and a faster algorithm.
Bruce Schneier, \fIApplied Cryptography\fR, 1995, Second Edition,
published by John Wiley & Sons, Inc.
The implementation of the \s-1DES\s0 algorithm was developed by,
and is copyright of, Eric Young (eay@mincom.oz.au).
Other parts of the perl extension and module are
copyright of Systemics Ltd ( http://www.systemics.com/ ).
Cross-platform work and packaging for single algorithm
distribution is copyright of W3Works, \s-1LLC\s0.
This single-algorithm package and cross-platform code is
maintained by Dave Paris <amused@pobox.com>.