Intel EP80579 User Manual

Intel

®

 EP80579 Software for Security Applications on Intel

®

 QuickAssist Technology

August 2009

PG

Order Number: 320183-004US

63

4. The Cryptographic API makes a call to an internal function which handles the 

operation and understands the message format to send to the SSU.

5. The Cryptographic API functions internally format the data as required by the 

hardware and send it to the SSU.

6. The SSU performs the required crypto operation.

Note: At this point, behavior diverges depending on whether the function was 

invoked synchronously or asynchronously.

7. The SSU after the operation is complete informs the software of the results via an 

interrupt.

8. The Cryptographic API calls the opPerform completion callback, along with the 

output data after formatting the data. This call executes in the context of a bottom 

half.

1. The application or framework initializes a session using the API session initialization 

function, this is a synchronous operation. During session initialization pre-

computes for Hash operations will be computed. This will involve a asynchronous 

call to the Security Services Unit (SSU) which will return the pre-computes. This 

only occurs during Hash operations. To the external Cryptographic API, this call is 

synchronous as the asynchronous nature is handled internally in Cryptographic API. 

The asynchronous part is hidden from the user by means of a queue.

Intel® QuickAssist Technology Cryptographic API

Security Access Library

Application or

Framework

Acceleration Services Unit (ASU)

(3) SymOpPerform

(IN a session ptr)

(1) Session Initialization

(IN func_ptr/NULL, 

session_setup_data,

session ptr)

(2) Init Session

(OUT status)

wait

Internal callback

...

All modes

Synchronous modes