RSA Security Projection Television 5.2.2 Manual de usuario descargar pdf (Pagina 315)

100

101

Chapter 7 Public-Key Operations 293

Performing Elliptic Curve Operations

Generating an EC Key Pair

See “Generating an Elliptic Curve Key Pair” on page 268 for the required steps. To

complete those steps, you will need a properly initialized random algorithm, the

parameters describing an elliptic curve (see the

x962.c sample to use BER-encoded

EC parameters), and optionally the acceleration table corresponding to that curve.

Assume that the steps in “Generating an Elliptic Curve Key Pair” on page 268 have

been completed and that

publicKey and privateKey are ready to be used.

Computing a Digital Signature

Step 1: Create

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: Set

You can set the algorithm to AI_EC_DSA or to AI_EC_DSAWithDigest. We are

demonstrating raw DSA signature generation and verification; thus, we will use

AI_EC_DSA. According to the entry in the Reference Manual, you must supply a

NULL_PTR to B_SetAlgorithmInfo.

stockECParamsBER.data = ECParamsBER;

stockECParamsBER.len = 154;

if ((status = B_SetAlgorithmInfo (*ecParamsObj, AI_ECParametersBER,

(POINTER)&stockECParamsBER)) != 0)

break;

B_ALGORITHM_OBJ ecDSASign = (B_ALGORITHM_OBJ)NULL_PTR;

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

break;

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RSA Security Projection Television 5.2.2 Manual de usuario Pagina 315

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