RSA Security Projection Television 5.2.2 Uživatelský manuál stáhnout pdf (Strana 49)

100

101

Chapter 2 Quick Start 27

Decrypting the Introductory Example

Step 3b: Setting the Key Object

We need to fill our key with the same 10 bytes of data we used for encryption. We

must make sure that we use the same key as we used to encrypt. For our sample

application, we can simply re-create the key data we had before:

Now we can complete the call to

B_SetKeyInfo:

Step 4: Update

Here, we must set the buffer that will store the decrypted data; for the RC4 cipher, it

should be the same size as the encrypted data’s buffer:

static unsigned char rc4KeyData[] = {

0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x10

};

if ((status = B_SetKeyInfo

(rc4Key, KI_Item, (POINTER)&rc4KeyData)) != 0)

break;

unsigned char *decryptedData = NULL_PTR;

decryptedData = T_malloc (encryptedDataLen);

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

break;

if ((status = B_DecryptUpdate

(rc4Decrypter, decryptedData, &decryptedLenUpdate,

encryptedDataLenTotal, encryptedData, outputLenTotal,

(B_ALGORITHM_OBJ)NULL_PTR,

(A_SURRENDER_CTX *)NULL_PTR)) != 0)

break;

1 2 ... 44 45 46 47 48 49 50 51 52 53 54 ... 375 376

Komentáře k této Příručce

Žádné komentáře

RSA Security Projection Television 5.2.2 Uživatelský manuál Strana 49

Komentáře k této Příručce