utbound_group_session sess key key_len pickled pickled_len</code></p><p>Loads a group session from a pickled base64 string. Decrypts the session using the supplied key.</p><p>Returns olm_error() on failure. If the key doesn't match the one used to encrypt the account then olm_outbound_group_session_last_error() will be &quot;BAD_ACCOUNT_KEY&quot;. If the base64 couldn't be decoded then olm_outbound_group_session_last_error() will be &quot;INVALID_BASE64&quot;. The input pickled buffer is destroyed</p></dd><