bootstrapCrossSigningFromPassphrase

open suspend override fun bootstrapCrossSigningFromPassphrase(passphrase: String, secretKeyEventContentGenerator: suspend () -> Pair<ByteArray, SecretKeyEventContent>): KeyService.BootstrapCrossSigning

This allows you to bootstrap cross signing. Be aware, that this could override an existing cross signing setup of the account. Be aware, that this also creates a new key backup, which could replace an existing key backup.