Raises when the encrypted file did not pass the data integrity verification.
The EncryptedFileIntegrityCheckFailed event's data class is EncryptedFileIntegrityCheckFailedEventArgs. The following properties provide information specific to this event:
|Cancel||Gets or sets a value indicating whether the event should be canceled. Inherited from CancelEventArgs.|
RichEditDocumentServer uses the Hash-based message authentication code (HMAC) to verify the document data integrity. If the document did not pass the code verification, the EncryptedFileIntegrityCheckFailed event fires.
The HMAC is calculated only for certain encryption types. When you save a password encrypted workbook, set the EncryptionOptions.Type to the EncryptionType.Strong to calculate HMAC.