These are utility functions for encrypting and decrypting messages sent to and from a Cybercash transaction server. The cybercash functions were introduced in PHP 4.0b4.The messages sent to and from Cybercash contain various attributes(documented by Cybercash) depending on the request. More information on message formats can be found at www.cybercash.com. There is a library of functions geared toward end-users in the PHP 4 source code tarball, named ext/cybercash/cyberlib.php. An older version of the file is in the PHP 3 tarball as extra/cyberlib/cyberlib.php3.
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