RSA Security Projection Television 5.2.2 Manual de usuario descargar pdf (Pagina 317)

100

101

Chapter 7 Public-Key Operations 295

Performing Elliptic Curve Operations

Step 5: Final

First you must allocate space to store the signature. The output of the ECDSA

signature is the BER encoding of a sequence of two integers, (r,s). At most, the size of

the output will be six bytes more than twice the length of the order. Retrieve the field

element length from

ecParamsObj and do a simple manipulation to find the field

element length in bytes.

Now, finalize the process and retrieve the signature. Note that the Reference Manual

entry for

AI_EC_DSA requires that you pass in a properly initialized random algorithm

B_SignFinal:

Step 6: Destroy

Destroy all objects that are no longer needed:

A_EC_PARAMS *ecParamsInfo;

unsigned int order, maxSignatureLen;

unsigned char *signature;

if((status = B_GetAlgorithmInfo((POINTER *)&ecParamsInfo, ecParamsObj,

AI_ECParameters)) != 0)

break;

orderLen = ecParamInfo->order.len;

maxSignatureLen = 2 * orderLen;

signature = T_malloc(maxSignatureLen);

if ((status = (signature == NULL_PTR)) != 0)

break;

unsigned int signatureLen;

if ((status = B_SignFinal (ecDSASign, signature, &signatureLen,

maxSignatureLen, randomAlgorithm,

(A_SURRENDER_CTX *)NULL_PTR)) != 0)

break;

B_DestroyAlgorithmObject (&ecParamsObj);

B_DestroyAlgorihmObject (&ecParamsSign);

B_DestroyKeyObject (&publicKey);

B_DestroyKeyObject (&privateKey);

T_free (signature);

1 2 ... 312 313 314 315 316 317 318 319 320 321 322 ... 375 376

Comentarios a estos manuales

Sin comentarios

RSA Security Projection Television 5.2.2 Manual de usuario Pagina 317

Comentarios a estos manuales