RSA Security Projection Television 5.2.2 Manual do Utilizador descarregar pdf (Página 202)

100

101

Block Ciphers

180 RSA BSAFE Crypto-C Developer’s Guide

You must also indicate that you want to use the standard CBC padding which is

defined in PKCS#5; do this by setting

fbParams.paddingMethodName

to "pad". You do

not need to pass in any padding parameters for this padding scheme. Again, “Block

Ciphers” on page 37 explains padding.

Now set up the

B_BLK_CIPHER_W_FEEDBACK_PARAMS structure:

Step 3: Init

You need a key before you can initialize the object for encryption. You will need to

first create the key object, and then set the key object.

Step 3a: Creating the Key Object

/* Complete steps 1 - 4 of Generating Random Numbers, then */

/* call B_GenerateRandomBytes. */

if ((status = B_GenerateRandomBytes

(randomAlgorithm, ivBytes, 8,

(A_SURRENDER_CTX *)NULL_PTR)) != 0)

break;

ivItem.data = ivBytes;

ivItem.len = 8;

fbParams.encryptionMethodName = (unsigned char *)"des";

fbParams.encryptionParams = NULL_PTR;

fbParams.feedbackMethodName = (unsigned char *)"cbc";

fbParams.feedbackParams = (POINTER)&ivItem;

fbParams.paddingMethodName = (unsigned char *)"pad";

fbParams.paddingParams = NULL_PTR;

if ((status = B_SetAlgorithmInfo

(encryptionObject, AI_FeedbackCipher,(POINTER)&fbParams)) != 0)

break;

B_KEY_OBJ desKey = (B_KEY_OBJ)NULL_PTR;

if ((status = B_CreateKeyObject (&desKey)) != 0)

break;

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