adiantum_request_ctx
struct adiantum_request_ctx *rctx = skcipher_request_ctx(req);
struct adiantum_request_ctx *rctx = skcipher_request_ctx(req);
BUILD_BUG_ON(offsetofend(struct adiantum_request_ctx, u) !=
sizeof(struct adiantum_request_ctx));
tfm, max(sizeof(struct adiantum_request_ctx),
offsetofend(struct adiantum_request_ctx,