RSA Security Projection Television 5.2.2 Manual do Utilizador descarregar pdf (Página 312)

100

101

Performing Elliptic Curve Operations

290 RSA BSAFE Crypto-C Developer’s Guide

Step 2b (Optional): Set Public Key Acceleration Table Info

You can use either the public key acceleration table or the generic acceleration table to

accelerate ECDSA verification. Verification using the public key acceleration table is

faster than verification using only the generic acceleration table.

Go through the steps in the section “Generating Acceleration Tables” to create a

generic acceleration table, placing the table information in

aTableItem

Step 3: Init

Associate a key with the algorithm object and provide a chooser that contains the

necessary algorithm methods:

Step 4: Update

Pass in the original message. It will be internally digested to make a new signature

that can be compared with the signature received by

B_VerifyFinal:

Step 5: Final

Pass in the signature that was received with the message. B_VerifyFinal returns 0 if

the signature verifies, or an error if it is an invalid signature:

ITEM pubKeyAccelTableItem;

if ((status = B_SetAlgorithmInfo (ecDSAVerify, AI_ECAcceleratorTable,

(POINTER)&pubKeyAccelTableItem)) != 0)

break;

if ((status = B_VerifyInit (ecDSAVerify, publicKey, EC_DSA_CHOOSER,

(A_SURRENDER_CTX *)NULL_PTR)) != 0)

break;

if ((status = B_VerifyUpdate (ecDSAVerify, dataToSign, dataToSignLen,

(A_SURRENDER_CTX *)NULL_PTR)) != 0)

break;

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