SAF may be invoked to verify the caller is authorized to use this callable service, the key label, or internal secure key tokens that are stored in the CKDS or PKDS.

SAF will be invoked to check authorization to use the secure messaging for keys service and any key labels specified as input.

Keys only appear in the clear within the secure boundary of the cryptographic coprocessor and never in host storage.

The Secure Messaging for Keys access control point controls the function of this service.

This table lists the required cryptographic hardware for each server type and describes restrictions for this callable service.

Table 207. Secure messaging for keys required hardware

Server	Required cryptographic hardware	Restrictions
IBM zSeries 900	PCI Cryptographic Coprocessor
IBM zSeries 990 IBM zSeries 890	PCI X Cryptographic Coprocessor Crypto Express2 Coprocessor
IBM System z9 EC IBM System z9 BC	Crypto Express2 Coprocessor