- int crypto_hash_update(struct hash_desc * desc, struct scatterlist * sg, unsigned int nbytes);
- cipher request handle
- scatter / gather list pointing to the data to be added to the message digest
- number of bytes to be processed from sg
Updates the message digest state of the cipher handle pointed to by the hash cipher request handle with the input data pointed to by the scatter/gather list.
0 if the message digest update was successful; < 0 if an error occurred