RSA Security Projection Television 5.2.2 Uživatelský manuál stáhnout pdf (Strana 313)

100

101

Chapter 7 Public-Key Operations 291

Performing Elliptic Curve Operations

Step 6: Destroy

Destroy all objects that are no longer needed:

Performing ECDSA with X9.62-Compliant BER

Like the previous section, this section shows how to use Crypto-C to perform ECDSA

in compliance with the ANSI X9.62 Standard. In the previous example, the parameters

were already initialized; in this example, X9.62 compliant BER encodings are used to

initialize the parameters.

The example in this section corresponds to the file

x962.c. on the CD-ROM.

Generating EC Parameters

In the section “Generating Elliptic Curve Parameters” on page 260, we illustrated how

to generate elliptic curve parameters by using

AI_ECParamGen. In this example, we

will use the BER encoding of an ANSI X9.62 algorithm identifier, which specifies an

elliptic curve, to set our algorithm object,

ecParamsObj. These parameters will

subsequently be used to generate a key pair.

Step 1: Creating an Algorithm Object

You need to create an algorithm object, ecParamsObj, to hold the generated parameter

information.

if ((status = B_VerifyFinal (ecDSAVerify, signature, signatureLen,

(B_ALGORITHM_OBJ)NULL_PTR,

(A_SURRENDER_CTX *)NULL_PTR)) != 0)

break;

T_free(signature);

B_DestroyAlgorithmObject(&ecParamsObj);

B_DestroyAlgorithmObject(&ecDSAVerify);

B_DestroyKeyObject(&publicKey);

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