fun produceSecretKey(encryptionKind: EncryptionKind) =
        secretKeySource(encryptionKind).let { keySource ->
            try {
                secretKeyFrom(keySource)?.also { key ->
                    assertKeyLength(key)
                }
            } catch (e: EncryptionException) {
                if (e.message != null) {
                    throw e
                }