Cryptography for Intel® Integrated Performance Primitives Developer Reference

Developer Reference

Contents

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.

Product and Performance Information

1

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