RSA Security Projection Television 5.2.2 Manual de usuario descargar pdf (Pagina 328)

Secret Sharing

306 RSA BSAFE Crypto-C Developer’s Guide

The example in this section corresponds to the file scrtshar.c.

Step 1: Creating An Algorithm Object

Declare a variable to be B_ALGORITHM_OBJ. As defined in the function prototype in

Chapter 4 of the Reference Manual, its address is the argument for

B_CreateAlgorithmObject:

Step 2: Setting The Algorithm Object

There is only one AI that implements the Bloom-Shamir secret sharing algorithm:

AI_BSSecretSharing. The Reference Manual Chapter 2 entry on this AI reports that the

format of

info

supplied to B_SetAlgorithmInfo is the following struct:

Because you want to set the threshold to two, set your algorithm object as follows:

Step 3: Init

Initialize the algorithm with B_EncryptInit. No key is necessary, so pass a properly

cast

NULL_PTR for the key object. This algorithm object does not need an algorithm

chooser, so pass a properly cast

NULL_PTR for that argument as well. This function is

very quick, so it is reasonable to pass a

NULL_PTR for the surrender context:

B_ALGORITHM_OBJ secretSplitter = (B_ALGORITHM_OBJ)NULL_PTR;

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

break;

typedef struct {

unsigned int threshold; /* share threshold */

} B_SECRET_SHARING_PARAMS;

B_SECRET_SHARING_PARAMS secretSharingParams;

secretSharingParams.threshold = 2;

if ((status = B_SetAlgorithmInfo

(secretSplitter, AI_BSSecretSharing,

(POINTER)&secretSharingParams)) != 0)

break;

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RSA Security Projection Television 5.2.2 Manual de usuario Pagina 328