PreKeyConfiguration

Local prekey inventory and signed prekey lifecycle settings, see docs/signed-prekey-lifecycle.md.

oneTimePreKeyTarget is the number of unused one-time prekeys SecureMessageClient.initialize keeps in storage. Consumed keys are replaced with new ones on the next initialization.

signedPreKeyRotationAge is the age at which SecureMessageClient.initialize replaces the current signed prekey with a new one. Must be positive; Duration.INFINITE turns age-based rotation off.

signedPreKeyGracePeriod is how long a replaced signed prekey keeps its private key, so delayed first-contact messages that name it can still be accepted. After that, initiations that name it are rejected and SecureMessageClient.initialize deletes it. It also bounds how long a withheld initiation can be accepted. Must not be negative. Zero means a replaced key is rejected at once and deleted on the next initialization, so every first-contact message still in flight at rotation fails. Duration.INFINITE keeps replaced keys forever (the behavior before milestone 7).

The defaults are this project's conservative starting values, easy to change per client. They are not taken from Signal or another protocol.