RSA Security Projection Television 5.2.2 Manual de usuario descargar pdf (Pagina 302)

Performing Elliptic Curve Operations

280 RSA BSAFE Crypto-C Developer’s Guide

Step 5b: Build the public-key acceleration table

It can take a while to generate the table, so use a surrender function. See “The

Surrender Context” on page 118 for more information:

Step 6: Destroy

Zeroize and free all sensitive information when it is no longer needed:

Performing EC Diffie-Hellman Key Agreement

Performing elliptic curve key agreement is similar to the ordinary Diffie-Hellman key

agreement scheme, which allows two parties to obtain the same symmetric key. First,

the two parties seeking to generate a secret key need to agree on the elliptic curve

parameters. The parameters can be generated by a central authority or by the parties

themselves.

The example in this section corresponds to the file

ecdh.c.

In this example, the two parties who wish to derive the same secret key are Alice and

Bob. Both parties need to be provided with the same parameters:

ITEM pubKeyAccelTableItem;

generalSurrenderContext.Surrender = GeneralSurrenderFunction;

generalSurrenderContext.handle = (POINTER)&generalFlag;

generalSurrenderContext.reserved = NULL_PTR;

generalFlag = 0;

if ((status = B_BuildTableFinal

(buildTable, pubKeyAccelTableItem.data,

&(pubKeyAccelTableItem.len), maxTableLen,

&generalSurrenderContext)) != 0)

break;

T_memset(pubKeyAccelTableItem.data, 0, pubKeyAccelTableItem.len);

T_free(pubKeyAccelTableItem.data);

B_DestroyAlgorithmObject(&buildTable);

B_ALGORITHM_OBJ ecParamsObj = (B_ALGORITHM_OBJ)NULL_PTR;

1 2 ... 297 298 299 300 301 302 303 304 305 306 307 ... 375 376

Sin comentarios

RSA Security Projection Television 5.2.2 Manual de usuario Pagina 302