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.
PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at http://www.opencontent.org/openpub/). The authors of this book have elected not to choose any options under the OPL. This online book was obtained from http://www.fooassociates.com/phpfer/ and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.