A routine to Encrypt/Decrypt Files and Strings

Tony Marston - 31st December 2000

Here is a piece of software sent to me by Michael J Levene after he saw my article A Data Encryption routine for UNIFACE. This is provided as a DLL and supports the following operations:

• Allows a string of text to be encrypted or decrypted.
• Allows a file to be encrypted or decrypted.
• Compares a value entered by the user with an encrypted block of text and an encryption key. Rather than decrypting the stored value for the comparison the user value is encrypted, thus preventing it from being hacked by taking Uniface into debug mode.

This routine has the added advantage that it can be called from both Uniface and non-Uniface applications. The zip file includes as an example an Excel worksheet that references the DLL via Visual Basic for Applications (VBA).

The sample software is contained in a zip file which can be downloaded here for 7.2.02, here for 7.2.06, and here for 8.1.01. It contains the following objects:

If this DLL does not work with your version of Uniface then contact either myself or Michael J Levene (the author) and a new one will be provided.

Tony Marston
31st December 2000

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