Developer Guide and Reference for Intel® Integrated Performance Primitives Cryptography
AES_GCMProcessAAD
Processes additional authenticated data of a given length according to the GCM specification.
Syntax
IppStatus ippsAES_GCMProcessAAD(const Ipp8u* pAAD, int ivAAD, IppsAES_GCMState* pState);
Include Files
ippcp.h
Parameters
| pAAD | Pointer to the additional authenticated data. | 
| ivAAD | Length of additional authenticated data *pAAD (in bytes). | 
| pState | Pointer to the IppsAES_GCMState context. | 
Description
The function processes ivAAD bytes of additional authenticated data *pAAD as specified in NIST SP 800-38D.
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 ivAAD is less than zero. | 
| ippStsBadArgErr | Indicates an error condition if ivAAD is zero and pState is not GcmInit or GcmIVProcessing. This means that the function call sequence is illegal. |