rams() and EVP_SIGNATURE_settable_ctx_params() return a constant <a href="../man3/OSSL_PARAM.html">OSSL_PARAM(3)</a> array that describes the names and types of key parameters that can be retrieved or set by a signature algorithm using <a href="../man3/EVP_PKEY_CTX_get_params.html">EVP_PKEY_CTX_get_params(3)</a> and <a href="../man3/EVP_PKEY_CTX_set_params.html">EVP_PKEY_CTX_set_params(3)</a>.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>EVP_SIGNATURE_fetch() returns a pointer to an <b>EVP_SIGNATURE</