h2>

<dl>

<dt id="dhkem-ikm-OSSL_PKEY_PARAM_DHKEM_IKM-octet-string">&quot;dhkem-ikm&quot; (<b>OSSL_PKEY_PARAM_DHKEM_IKM</b>) &lt;octet string&gt;</dt>
<dd>

<p>DHKEM requires the generation of a keypair using an input key material (seed). Use this to specify the key material used for generation of the private key. This value should not be reused for other purposes. It should have a length of at least 32 for X25519, and 56 for X448.</p>

<p>This is only supported by X25519 and X448.</p>

</dd>
</dl>

<p>Use