This section describes the application program interface for personal identification number keypads (PIN pads) and other encryption/decryption devices. This description includes definitions of the service-specific commands that can be issued, using the WFSAsyncExecute, WFSExecute, WFSGetInfo and WFSAsyncGetInfo functions. This section describes the general interface for the following functions: • Administration of encryption devices • Loading of encryption keys • Encryption / decryption • Entering Personal Identification Numbers (PINs) • PIN verification • PIN block generation (encrypted PIN) • Clear text data handling • Function key handling • PIN presentation to chipcard • Read and write safety critical Terminal Data from/to HSM • HSM and Chipcard Authentication • EMV 4.0 PIN blocks, EMV 4.0 public key loading, static and dynamic data verification