ecc_sign_ctx
const struct ecc_sign_ctx *keyinfo = ECC_CCTX(cbdata->sctx);
struct ecc_sign_ctx *keyinfo = ECC_CTX(sctx);
.pkgsign_ctx_size = sizeof(struct ecc_sign_ctx),
#define ECC_CCTX(c) (__containerof(c, const struct ecc_sign_ctx, sctx))
#define ECC_CTX(c) (__containerof(c, struct ecc_sign_ctx, sctx))