Rijndael128GCMGetTag

Generates the authentication tag in the GCM mode.

Syntax

IppStatus ippsRijndael128GCMGetTag (Ipp8u* pTag, Ipp32u tagLen, const IppsRijndael128GCMState* pState);

Parameters

pTag	Pointer to the authentication tag.
tagLen	Length of the authentication tag *pTag (in bytes).
pState	Pointer to the IppsRijndael128GCMState context.

Description

This function is declared in the ippcp.h file. The function generates and computes the authentication tag of length tagLen according to GCM as specified in [NIST SP 800-38D]. A call to ippsRijndael128GCMGetTag does not stop the process of authenticated encryption/decryption.

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 tagLen <1 or taglen >16.