RSA Security Projection Television 5.2.2 Manual de usuario descargar pdf (Pagina 52)

Multiple Updates

30 RSA BSAFE Crypto-C Developer’s Guide

places them into the given buffer, and sets a flag indicating whether the bytes

returned are the last ones in the file or not. Assume also that the subroutine

AppendDataToFile

appends output data to a file. Finally, assume we have already

called

B_CreateAlgorithmObject, B_SetAlgorithmInfo, and B_EncryptInit:

#define UPDATE_SIZE 64

#define UPDATE_OUTPUT_SIZE (UPDATE_SIZE + 16)

FILE *inputFile = (FILE *)NULL_PTR;

FILE *outputFile = (FILE *)NULL_PTR;

unsigned char dataToEncrypt[UPDATE_SIZE];

unsigned char blockOfEncryptedData[UPDATE_OUTPUT_SIZE];

unsigned int dataToEncryptLen, totalBytesSoFar;

unsigned int outputLenUpdate, outputLenFinal;

unsigned int sizeToUpdate = UPDATE_SIZE;

int endFlag, status;

do {

totalBytesSoFar = 0;

while ((status = GetDataFromFile

(inputFile, sizeToUpdate, dataToEncrypt,

&dataToEncryptLen, &endFlag)) == 0) {

printf ("dataToEncryptLen = %i \n", dataToEncryptLen);

PrintBuf (dataToEncrypt, dataToEncryptLen);

if ((status = B_EncryptUpdate

(encryptionObject, blockOfEncryptedData,

&outputLenUpdate, UPDATE_OUTPUT_SIZE, dataToEncrypt,

dataToEncryptLen, (B_ALGORITHM_OBJ)NULL_PTR,

(A_SURRENDER_CTX *)NULL_PTR)) != 0)

break;

/* Save the encrypted data. */

if ((status = AppendDataToFile

(outputFile, blockOfEncryptedData,

outputLenUpdate)) != 0)

break;

totalBytesSoFar += outputLenUpdate;

if (endFlag == 1)

break;

} /* end while */

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RSA Security Projection Television 5.2.2 Manual de usuario Pagina 52