parameters, given the context <i>ctx</i> and its underlying context. The set of parameters given with <i>params</i> determine exactly what parameters should be retrieved. Note that a parameter that is unknown in the underlying context is simply ignored.</p>

<p>EVP_MAC_CTX_set_params() passes chosen parameters to the underlying context, given a context <i>ctx</i>. The set of parameters given with <i>params</i> determine exactly what parameters are passed down. If <i>params</i> are NULL, the underlying conte