SHA2_CV_SIZE
#define SHA2_IMBL_OFFSET(bs) (SHA2_CV_SIZE(bs))
#define SHA2_KEY_OFFSET(bs) (SHA2_CV_SIZE(bs) + SHA2_IMBL_SIZE(bs))
#define SHA2_IMBL_OFFSET(bs) (SHA2_CV_SIZE(bs))
#define SHA2_KEY_OFFSET(bs) (SHA2_CV_SIZE(bs) + SHA2_IMBL_SIZE(bs))