A Reversible Encryption Routine for PHP

By Tony Marston
2005-04-15

Using the Encryption Class

In order to use this class you must first include/require the file containing the class definition and then create an object or instance of the class.

require 'std.encryption.class.inc';

$crypt = new Encryption;

To encrypt a string you must supply the string and a key. The string length is optional. Note that before you write this to your database you should use the addslashes() command to deal with any special characters.

$encrypt_result = $crypt->encrypt($key, $password, $pswdlen);

$errors = $crypt->errors;

To decrypt a string you must supply the string and the key that was used to encrypt it.

$decrypt_result = $crypt->decrypt($key, $password);

$errors = $crypt->errors;

Tutorial pages:

A Reversible Encryption Routine for PHP
Rotating each character a fixed number of positions
Swapping between two different character strings
Manipulating the index number between the two strings
Customising the Encryption Algorithm
Class Variables
Class Constructor
The ConvertKey function
The ApplyFudgeFactor function
The CheckRange Function
The Decrypt function
Using the Encryption Class
Summary

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