private val cacheBuilderFactory: GlobalScopedCacheBuilderFactory,
) : EncryptionService {

    private
    val secretKey: SecretKey? by lazy {
        produceSecretKey(EncryptionKind.select(startParameter.encryptionRequested))
    }

    private
    fun produceSecretKey(encryptionKind: EncryptionKind) =
        secretKeySource(encryptionKind).let { keySource ->
            try {
                secretKeyFrom(keySource)?.also { key ->