<p><code>ed25519_verify util key key_len msg msg_len signature signature_len</code></p><p>Verify an ed25519 signature. If the key was too small then olm_utility_last_error() will be &quot;INVALID_BASE64&quot;. If the signature was invalid then olm_utility_last_error() will be &quot;BAD_MESSAGE_MAC&quot;.</p></dd></dl><dl><dt class="spec value" id="val-pk_encryption_size"><a href="#val-pk_encryption_size" class="anchor"></a><code><span class="keyword">val</span> pk_encryption_size : unit <span>&#45;&gt;</spa