cryptd_hash_request_ctx
struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
sizeof(struct cryptd_hash_request_ctx) +
struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);
struct cryptd_hash_request_ctx *rctx = ahash_request_ctx(req);