RSA(), EVP_PKEY_get1_DSA(), EVP_PKEY_get1_DH() and EVP_PKEY_get1_EC_KEY() will always return the cached copy returned by the first call.</p>

<p>EVP_PKEY_get0_engine() returns a reference to the ENGINE handling <i>pkey</i>. This function is deprecated. Applications should use providers instead of engines (see <a href="../man7/provider.html">provider(7)</a> for details).</p>

<p>EVP_PKEY_set1_engine() sets the ENGINE handling <i>pkey</i> to <i>engine</i>. It must be called after the key algorithm and compone