Software integrity test:

The integrity of the software module is tested using a 32-bit error detection code (EDC). The value of this EDC is set and stored when the module is created. On testing, the EDC is re-computed for the DLL module file being used and compared with the stored value. If the values do not match, the test fails.

In addition to this automatic software integrity test, the integrity of the entire DLL file can be independently verified by the user using published message digest and checksum values before and after installation - see CryptoSys PKI Pro Toolkit Integrity Checks.