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.
Note
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. |