HMAC_Update
HMAC_Update
Digests the current input message stream of the specified length.
Syntax
IppStatus ippsHMAC_Update(const Ipp8u *
pSrc
, int
len
, IppsHMACState *
pCtx
);
IppStatus ippsHMACUpdate_rmf(const Ipp8u *
pSrc
, int
len
, IppsHMACState_rmf *
pCtx
);
Include Files
ippcp.h
Parameters
- pSrc
- Pointer to the buffer containing a part of the whole message.
- len
- The length of the actual part of the message in bytes.
- pCtx
- Pointer to theIppsHMACStateorIppsHMACState_rmfcontext.
Description
The function digests the current input message stream of the specified length.
The function first integrates the previous partial block with the input message stream and then partitions them into multiple message blocks (as specified by the applied hash algorithm) with a possible additional partial block. For each message block, the function uses the selected hash algorithm to transform the block into a new chaining digest value.
This function has a
reduced memory footprint
version. To learn more, see Reduced Memory Footprint Functions.Return Values
- ippStsNoErr
- Indicates no error. Any other value indicates an error or warning.
- ippStsNullPtrErr
- Indicates an error condition if any of the specified pointers isNULL.
- ippStsContextMatchErr
- Indicates an error condition if the context parameter does not match the operation.
- ippStsLengthErr
- Indicates an error condition if the length of the input data stream is less than zero.