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Chapter 3 Using the Intel Random Number Generator 17

Generating Random Numbers

Step 1: Create an Algorithm Object

The next task is to create the algorithm object. This object will control the random byte

generation. Creating the object only allocates the memory needed for the process. It

does not initialize the object for random number generation.

Step 2: Set the Algorithm Object

Set the algorithm info. We will specify AI_HW_Random, which will point to the

hardware method that is associated to

AM_HW_RANDOM via B_CreateSessionChooser.

Step 3: Initialize the Random Object

Initialize

randomAlgorithm

to generate random bytes. Here we pass the

CHOOSER

that

was created via the call to

B_CreateSessionChooser above. This chooser contains

pointers to the hardware method that was associated with

AM_HW_RANDOM.

HW_TABLE_ENTRY *HARDWARE_CHOOSER[] = {

&HW_INTEL_RANDOM,

(HW_TABLE_ENTRY *)NULL_PTR

};

B_ALGORITHM_METHOD **CHOOSER = (B_ALGORITHM_METHOD **)NULL_PTR;

if ((status = B_CreateSessionChooser

(SOFTWARE_CHOOSER, &CHOOSER, (POINTER *)HARDWARE_CHOOSER,

(ITEM *)NULL_PTR, (POINTER *)NULL_PTR, &oemTagList)) != 0)

break;

B_ALGORITHM_OBJ randomAlgorithm = (B_ALGORITHM_OBJ)NULL_PTR;

if ((status = B_CreateAlgorithmObject (&randomAlgorithm)) != 0)

break;

if ((status = B_SetAlgorithmInfo

(randomAlgorithm, AI_HW_Random, NULL_PTR)) != 0)

break;

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RSA Security Home Security System 4.3 Manuel d'utilisateur Page 21