Developer Reference

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HMAC_GetTag

Computes the current HMAC value of the processed part of the message.

Syntax

IppStatus ippsHMAC_GetTag(Ipp8u*
pMD
, int
mdLen
, const IppsHMACState*
pCtx
);
IppStatus ippsHMACGetTag_rmf(Ipp8u*
pMD
, int
mdLen
, const IppsHMACState_rmf*
pCtx
);
Include Files
ippcp.h
Parameters
pMD
Pointer to the authentication tag.
mdLen
The length of the tag (in bytes).
pCtx
Pointer to the
IppsHMACState
or
IppsHMACState_rmf
context.
Description
The function computes the message digest based on the current context as specified in [FIPS PUB 198]. A call to this function retains the possibility to update the digest.
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
.
ippStsLengthErr
Indicates an error condition if
mdLen
<1 or
mdLen
exceeds the maximal length of a particular digest.
ippStsContextMatchErr
Indicates an error condition if the context parameter does not match the operation.

Product and Performance Information

1

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