b> for success or <b>NULL</b> for failure.</p>

<p>EVP_SIGNATURE_up_ref() returns 1 for success or 0 otherwise.</p>

<p>EVP_SIGNATURE_names_do_all() returns 1 if the callback was called for all names. A return value of 0 means that the callback was not called for any names.</p>

<p>EVP_SIGNATURE_gettable_ctx_params() and EVP_SIGNATURE_settable_ctx_params() return a constant <a href="../man3/OSSL_PARAM.html">OSSL_PARAM(3)</a> array or NULL on error.</p>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p><a href="../man7/c