essiv_aead_request_ctx
struct essiv_aead_request_ctx *rctx = aead_request_ctx(req);
struct essiv_aead_request_ctx *rctx = aead_request_ctx(req);
BUILD_BUG_ON(offsetofend(struct essiv_aead_request_ctx, aead_req) !=
sizeof(struct essiv_aead_request_ctx));
subreq_size = sizeof_field(struct essiv_aead_request_ctx, aead_req) +
tctx->ivoffset = offsetof(struct essiv_aead_request_ctx, aead_req) +