Message encryption and message digest
Message authentication codes (MACs)
Application programmer interfaces (APIs) for accessing cryptographic services
Service provider interfaces (SPIs) for providing cryptographic services
An administration command for managing cryptographic resources
The following figure provides an overview of the cryptographic framework. The light gray shading in the figure indicates the user-level portion of the cryptographic framework. The dark gray shading represents the kernel-level portion of the framework. Private software is indicated by a background with diagonal striping.