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

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