AES_GCMGetTag

Generates the authentication tag in the GCM mode.

Syntax

IppStatus ippsAES_GCMGetTag (Ipp8u* pTag, int tagLen, const IppsAES_GCMState* pState);

Include Files

ippcp.h

Parameters

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

Description

The function generates and computes the authentication tag of length tagLen according to GCM as specified in NIST SP 800-38D. A call to ippsAES_GCMGetTag 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.