RSA Security Projection Television 5.2.2 Instrukcja Użytkownika Pobierz pdf (Strona 301)

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Chapter 7 Public-Key Operations 279

Performing Elliptic Curve Operations

Step 3: Init

To initialize the proper algorithms, you must supply an algorithm chooser with the

appropriate algorithm methods. See the Reference Manual Chapter 2 entry for

AI_ECBuildPubKeyAccelTable for a list of the appropriate AMs to include in the

chooser:

Step 4: Update

There is no Update step for building acceleration tables.

Step 5: Final

Step 5a: Allocate memory

You must allocate sufficient memory to hold the acceleration table. Use

B_BuildTableGetBufSize to obtain the maximum size of the public key acceleration

table. Then allocate enough space to hold the table:

B_ALGORITHM_METHOD *ecAccelChooser[] = {

&AM_ECFP_BLD_PUB_KEY_ACC_TAB,

&AM_ECF2POLY_BLD_PUB_KEY_ACC_TAB,

(B_ALGORITHM_METHOD *)NULL_PTR

};

if ((status = B_BuildTableInit(buildTable, ecAccelChooser,

(A_SURRENDER_CTX *)NULL_PTR)) != 0)

break;

ITEM pubKeyAccelTableItem;

unsigned int maxTableLen;

if ((status = B_BuildTableGetBufSize(buildTable, &maxTableLen)) != 0)

break;

pubKeyAccelTableItem.data = T_malloc(maxTableLen);

if ((status = (pubKeyAccelTableItem.data == NULL_PTR)) != 0)

break;

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