EVP_SIGNATURE_up_ref
&& EVP_SIGNATURE_up_ref(sig)
&& EVP_SIGNATURE_up_ref(sig)
if (!EVP_SIGNATURE_up_ref(rctx->op.sig.signature))
return EVP_SIGNATURE_up_ref(data);
if (!EVP_SIGNATURE_up_ref(signature))
int EVP_SIGNATURE_up_ref(EVP_SIGNATURE *signature);