Chapter 1 Introduction 5
Code Example
Code Example
The following code example summarizes the six-step model used in Crypto-C. This
model is described in depth in Chapter 1 of the
User’s Manual
. The example encrypts
data within a DES key, using a function named
EncryptData
. The inputs to
EncryptData
are: a pointer to the buffer, the data’s length, a pointer to the 8-byte DES key value,
and a pointer to the 8-byte initialization vector used by the
DES-CBC algorithm.
EncryptData
writes the encrypted data to the buffer supplied by the caller and returns
the length of the encrypted data.
#include “aglobal.h”
#include “bsafe.h”
#include “demochos.h”
#define NULL_SURRENDER_PTR ((A_SURRENDER_CTX *)NULL_PTR)
int EncryptData
(output, outputLen, maxOutputLen, input, inputLen, keyValue, iv)
unsigned char *output; /* pointer to output data */
unsigned int outputLen; /* pointer to length of encrypted data */
unsigned int maxOutputLen; /* size of output buffer */
unsigned char *input; /* pointer to input data buffer */
unsigned int inputLen; /* length of input data */
unsigned char *keyValue; /* pointer to 8-byte DES key */
unsigned char *iv; /* pointer to 8-byte initialization vector */
{
B_ALGORITHM_OBJ desAlgorithm = (B_ALGORITHM_OBJ)NULL_PTR;
B_KEY_OBJ desKey = (B_KEY_OBJ)NULL_PTR;
B_BLK_CIPHER_W_FEEDBACK_PARAMS feedbackParams;
ITEM initVector;
unsigned int partOutLen;
int status;
/* break commands jump to the end of the do while (0) block */
do {
if ((status = B_CreateKeyObject (&desKey)) != 0)
break;
if ((status = B_SetKeyInfo
(desKey, KI_DES8Strong, (POINTER)keyValue)) != 0)
break;
