RSA Security Projection Television 5.2.2 Manual de usuario descargar pdf (Pagina 342)

The X9.31 Sample Program

320 RSA BSAFE Crypto-C Developer’s Guide

Computing a Digital Signature

Now you can use the key pair to compute a digital signature. For X9.31, this is done

using

AI_SignVerify. AI_SignVerify provides ANSI X9.31-compliant digital signing

and verification. The procedure to sign and verify using

AI_SignVerify is similar to

the steps outlined in “RSA Digital Signatures” on page 233. However,

AI_SignVerify

is a little different because it is more general purpose than the other signing and

verifying AIs. Therefore, you have to set a parameter that determines the exact

algorithm and action you wish to use.

Assume that

RSA_MODULUS_BITS gives the modulus size of the RSA key pair. The

proper AI to use for following the ANSI X9.31 standard for digital signatures is

AI_SignVerify. You must pass a pointer to a B_SIGN_VERIFY_PARAMS structure to

B_SetAlgorithmInfo. The structure, B_SIGN_VERIFY_PARAMS, is defined as follows:

For this application, set the parameters as follows:

• The possible values for

encryptionMethodName

are "rsaSignX931" or

"rsaVerifyX931". For signing, use "rsaSignX931".

• For

encryptionParams

and

digestParams

, pass a NULL_PTR.

/* ======================================================== */

printf ("\nComputing a Digital Signature \n");

printf ("============================= \n");

printf ("Input data: %s \n", inputData);

inputDataLen = (unsigned int)strlen (inputData);

printf ("Input data in hex: \n");

PrintBuf ((unsigned char *)inputData, inputDataLen);

/* Step 1: Create an algorithm object */

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

break;

typedef struct {

unsigned char *encryptionMethodName;

POINTER encryptionParams;

unsigned char *digestMethodName;

POINTER digestParams;

unsigned char *formatMethodName;

POINTER formatParams;

} B_SIGN_VERIFY_PARAMS;

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