CRYPTO_AHASH_REQ_PRIVATE
flags &= ~CRYPTO_AHASH_REQ_PRIVATE;
flags |= req->base.flags & CRYPTO_AHASH_REQ_PRIVATE;
return crypto_request_flags(&req->base) & ~CRYPTO_AHASH_REQ_PRIVATE;
req->base.flags &= ~CRYPTO_AHASH_REQ_PRIVATE;
req->base.flags |= old->base.flags & CRYPTO_AHASH_REQ_PRIVATE;