RSA Security Projection Television 5.2.2 Manual de usuario descargar pdf (Pagina 142)

System Considerations In Crypto-C

120 RSA BSAFE Crypto-C Developer’s Guide

A routine that calls Crypto-C functions would use the above surrender function as

follows:

For this surrender function, the

handle

contains a flag passed from the user. If

handle

is 0, this is the first time the surrender function has been called by the particular

Crypto-C routine currently executing. Then the surrender function will reset the flag

and the next time it is called, it will skip the

if clause and execute the else clause.

The coding examples in this manual use the example in this section as their surrender

context. The examples also note when a routine is lengthy enough to warrant use of a

surrender context. When a surrender context is not necessary, you can pass a properly

cast

NULL_PTR.

Saving State

Crypto-C v5.1 offers two new functions: B_GetAlgorithmState and

B_SetAlgorithmState. Use these functions to “serialize” (create and use) an algorithm

if ((int)*handle == 0) {

printf (“\nSurrender function ...\n”);

*handle = 1;

time (&currentTime);

}

else {

time (&getTime);

if (currentTime != getTime) {

printf “ .");

currentTime = getTime;

}

return (0);

}

A_SURRENDER_CTX generalSurrenderContext;

int generalFlag;

generalSurrenderContext.Surrender = GeneralSurrenderFunction;

generalSurrenderContext.handle = (POINTER)&generalFlag;

generalSurrenderContext.reserved = NULL_PTR;

generalFlag = 0;

if ((status = B_<function>

(<other arguments>, &generalSurrenderContext)) != 0)

break;

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RSA Security Projection Television 5.2.2 Manual de usuario Pagina 142