Developer Reference

Contents

HMAC_Pack, HMAC_Unpack

Packs/unpacks the
IppsHMACState
or
IppsHMACState_rmf
context into/from a user-defined buffer.

Syntax

IppStatus ippsHMAC_Pack (const IppsHMACState*
pCtx
, Ipp8u*
pBuffer
int
bufSize
);
IppStatus ippsHMACPack_rmf (const IppsHMACState_rmf*
pCtx
, Ipp8u*
pBuffer
int
bufSize
);
IppStatus ippsHMAC_Unpack (const Ipp8u*
pBuffer
, IppsHMACState*
pCtx
);
IppStatus ippsHMACUnpack_rmf (const Ipp8u*
pBuffer
, IppsHMACState_rmf*
pCtx
);
Include Files
ippcp.h
Parameters
pCtx
Pointer to the
IppsHMACState
or
IppsHMACState_rmf
context.
pBuffer
Pointer to the user-defined buffer.
bufSize
The size of the user-defined buffer in bytes.
Description
The
HMAC_Pack
function transforms the
*pCtx
context to a position-independent form and stores it in the
*pBuffer
buffer. The
HMAC_Unpack
function performs the inverse operation, that is, transforms the contents of the
*pBuffer
buffer into a normal
IppsHMACState
or
IppsHMACState_rmf
context. The
HMAC_Pack
and
HMAC_Unpack
functions enable replacing the position-dependent
IppsHMACState
or
IppsHMACState_rmf
context in the memory. Call the
HMAC_GetSize
function prior to
HMAC_Pack
to determine the size of the buffer.
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
.
ippStsMemErr
Indicates an error condition if the value of
bufSize
is less than the size of the
IppsHMACState
or
IppsHMACState_rmf
context.

Product and Performance Information

1

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