ill have been obtained from an earlier call to EVP_SIGNATURE_fetch(). If the reference count drops to 0 then the structure is freed.</p>

<p>EVP_SIGNATURE_up_ref() increments the reference count for an <b>EVP_SIGNATURE</b> structure.</p>

<p>EVP_SIGNATURE_is_a() returns 1 if <i>signature</i> is an implementation of an algorithm that&#39;s identifiable with <i>name</i>, otherwise 0.</p>

<p>EVP_SIGNATURE_get0_provider() returns the provider that <i>signature</i> was fetched from.</p>

<p>EVP_SIGNATURE_do_all