www.pudn.com > ntcrypto.rar > mac.h

// Message Authentication Code structures 
 
typedef struct _MACstate { 
	DWORD		dwBufLen; 
	HCRYPTKEY	hKey; 
	BYTE		Feedback[CRYPT_BLKLEN]; 
	BYTE		Buffer[CRYPT_BLKLEN]; 
        BOOL            FinishFlag; 
} MACstate;