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

Intel's compilers may or may not optimize to the same degree for non-Intel microprocessors for optimizations that are not unique to Intel microprocessors. These optimizations include SSE2, SSE3, and SSSE3 instruction sets and other optimizations. Intel does not guarantee the availability, functionality, or effectiveness of any optimization on microprocessors not manufactured by Intel. Microprocessor-dependent optimizations in this product are intended for use with Intel microprocessors. Certain optimizations not specific to Intel microarchitecture are reserved for Intel microprocessors. Please refer to the applicable product User and Reference Guides for more information regarding the specific instruction sets covered by this notice.

Notice revision #20110804