TWEAK_SIZE
BUILD_BUG_ON(TWEAK_SIZE % POLY1305_BLOCK_SIZE != 0);
TWEAK_SIZE / POLY1305_BLOCK_SIZE, 1);
inst->alg.ivsize = TWEAK_SIZE;
polyval_update(poly_ctx, req->iv, TWEAK_SIZE);
static_assert(TWEAK_SIZE % POLYVAL_BLOCK_SIZE == 0);
inst->alg.ivsize = TWEAK_SIZE;
cpu_to_le64(TWEAK_SIZE * 8 * 2 + 2 + has_remainder),