To call the CryptoSys API functions
from a classic Visual Basic project or VBA application,
just add the module basCryptoSys.bas to your project
(VBA users should delete the first line Attribute VB_Name = "basCryptoSys").
The VB functions work in the same way as you would call the Win32 API functions from VB. You must use the correct variable types and must pre-dimension strings and byte arrays that are to receive output or you will suffer the wrath of the great god Gee-pee-eff.
For examples, see the test code
provided in the distribution in the folder C:\Program Files\CryptoSys\VB6.