Parent topic:MPLAB® Harmony Crypto Library
int CRYPT_HMAC_DataAdd(
CRYPT_HMAC_CTX* hmac,
const unsigned char* input,
unsigned int sz
);
This function adds data to the HMAC so that multiple blocks of data can be processed.
The CRYPT_HMAC_CTX context must be initialized using the CRYPT_HMAC_SetKey function prior to any call to this function.
| Parameters | Description |
|---|---|
| hmac | Pointer to context that saves state between calls. |
| input | Pointer to the data that will be used to update the hash. |
| sz | Size of the input data in bytes. |
BAD_FUNC_ARG - An invalid pointer was passed to the function.
0 - An invalid pointer was not passed to the function.
None.
CRYPT_HMAC_CTX mcHmac;
byte mcDigest[CRYPT_SHA512_DIGEST_SIZE];
CRYPT_HMAC_SetKey(&mcHmac, CRYPT_HMAC_SHA, key, 4);
CRYPT_HMAC_DataAdd(&mcHmac, ourData, OUR_DATA_SIZE);
CRYPT_HMAC_Finalize(&mcHmac, mcDigest);