simplifies nonce calculation

src/commonMain/kotlin/net/sergeych/kiloparsec/KiloL0Interface.kt

@@ -1,10 +1,6 @@
 package net.sergeych.kiloparsec
 
 import kotlinx.coroutines.CompletableDeferred
-import net.sergeych.mp_logger.LogTag
-import net.sergeych.mp_logger.Loggable
-import net.sergeych.mp_logger.debug
-import net.sergeych.mp_logger.info
 import net.sergeych.tools.AtomicCounter
 import net.sergeych.utools.pack
 
@@ -19,7 +15,10 @@ private val idCounter = AtomicCounter(0)
 internal class KiloL0Interface<T>(
     private val clientInterface: LocalInterface<KiloScope<T>>,
     private val deferredParams: CompletableDeferred<KiloParams<T>>,
-) : LocalInterface<Unit>(), Loggable by LogTag("KL0:${idCounter.incrementAndGet()}") {
+) : LocalInterface<Unit>() {
+
+    override var logTag: String = "KL0:${idCounter.incrementAndGet()}"
+
     init {
         // local interface uses the same session as a client:
         addErrorProvider(clientInterface)

src/commonMain/kotlin/net/sergeych/kiloparsec/KiloParams.kt

@@ -47,23 +47,9 @@ data class KiloParams<S>(
         blake2b("token_".encodeToUByteArray() + sessionKey.sessionTag).sliceArray(0..<SymmetricKey.nonceByteLength)
     }
 
-    private inline fun encodeNonce(base: UByteArray, nonce: ULong): UByteArray {
-        val result = base.copyOf()
-        var x = nonce
-        var i = 0
-        while (x > 0u) {
-            result[i] = result[i] xor (x and 0xFFu).toUByte()
-            x = x shr 8
-            i++
-        }
-        return result
-    }
+    private val numericNonce = NumericNonce(token)
 
-    private inline fun encodeSendNonce(nonce: ULong): UByteArray = encodeNonce(token, nonce)
-    private inline fun encodeReceiveNonce(nonce: ULong): UByteArray = encodeNonce(token, nonce)
-
-
-    private val proptectedOp = ProtectedOp()
+    private val protectedOp = ProtectedOp()
 
     /**
      * Encrypt using send keys and proper nonce
@@ -74,10 +60,10 @@ data class KiloParams<S>(
         else
             null
 
-        val n = proptectedOp.invoke { nonce++ }
+        val n = protectedOp.invoke { nonce++ }
 
         return pack(
-            Package(n, sessionKey.encryptWithNonce(message, encodeSendNonce(n), fill))
+            Package(n, sessionKey.encryptWithNonce(message, numericNonce.withULong(n), fill))
         )
     }
 
@@ -85,7 +71,7 @@ data class KiloParams<S>(
     fun decrypt(encryptedMessage: UByteArray): UByteArray =
         protectDecryption {
             val p: Package = BipackDecoder.decode(encryptedMessage.toDataSource())
-            sessionKey.decryptWithNonce(p.encryptedMessage, encodeReceiveNonce(p.nonce))
+            sessionKey.decryptWithNonce(p.encryptedMessage, numericNonce.withULong(p.nonce))
         }
 
 }