Developer Reference

Contents

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 the
IppsHMACState
or
IppsHMACState_rmf
context.
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 is
NULL
.
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.

Product and Performance Information

1

Performance varies by use, configuration and other factors. Learn more at www.Intel.com/PerformanceIndex.