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Crypt::DES (3)
  • >> Crypt::DES (3) ( Разные man: Библиотечные вызовы )
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    NAME

    Crypt::DES - Perl DES encryption module
     
    

    SYNOPSIS

        use Crypt::DES;
    
    
     

    DESCRIPTION

    The module implements the Crypt::CBC interface, which has the following methods
    blocksize =item keysize =item encrypt =item decrypt
     

    FUNCTIONS

    blocksize
    Returns the size (in bytes) of the block cipher.
    keysize
    Returns the size (in bytes) of the key. Optimal size is 8 bytes.
    new
            my $cipher = new Crypt::DES $key;
    
    

    This creates a new Crypt::DES BlockCipher object, using $key, where $key is a key of "keysize()" bytes.

    encrypt
            my $cipher = new Crypt::DES $key;
            my $ciphertext = $cipher->encrypt($plaintext);
    
    

    This function encrypts $plaintext and returns the $ciphertext where $plaintext and $ciphertext should be of "blocksize()" bytes.

    decrypt
            my $cipher = new Crypt::DES $key;
            my $plaintext = $cipher->decrypt($ciphertext);
    
    

    This function decrypts $ciphertext and returns the $plaintext where $plaintext and $ciphertext should be of "blocksize()" bytes.

     

    EXAMPLE

            my $key = pack("H16", "0123456789ABCDEF");
            my $cipher = new Crypt::DES $key;
            my $ciphertext = $cipher->encrypt("plaintex");  # NB - 8 bytes
            print unpack("H16", $ciphertext), "\n";
    
    
     

    NOTES

    Do note that DES 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 DES 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.  

    SEE ALSO

    Crypt::Blowfish Crypt::IDEA

    Bruce Schneier, Applied Cryptography, 1995, Second Edition, published by John Wiley & Sons, Inc.  

    COPYRIGHT

    The implementation of the DES 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, LLC.  

    MAINTAINER

    This single-algorithm package and cross-platform code is maintained by Dave Paris <amused@pobox.com>.


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    FUNCTIONS
    EXAMPLE
    NOTES
    SEE ALSO
    COPYRIGHT
    MAINTAINER


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