added numeric nonce calculator

src/commonTest/kotlin/ToolsTest.kt

@@ -1,11 +1,6 @@
 import kotlinx.coroutines.test.runTest
-import net.sergeych.crypto2.createContrail
-import net.sergeych.crypto2.initCrypto
-import net.sergeych.crypto2.isValidContrail
-import kotlin.test.Test
-import kotlin.test.assertEquals
-import kotlin.test.assertFalse
-import kotlin.test.assertTrue
+import net.sergeych.crypto2.*
+import kotlin.test.*
 
 class ToolsTest {
     @Test
@@ -17,4 +12,18 @@ class ToolsTest {
         c[2] = 11u
         assertFalse { isValidContrail(c) }
     }
+
+    @Test
+    fun numericNonceTest() = runTest{
+        initCrypto()
+        val nn = NumericNonce.random(32)
+        val counter = 1031
+        val x1 = nn.withInt(0)
+        val x2 = nn.withInt(counter)
+        println(x1.toDump())
+        println(x2.toDump())
+        val t = (x1[0] xor x2[0]).toInt() + ((x1[1] xor x2[1]).toInt() shl 8)
+        assertEquals(counter, t)
+        assertContentEquals(x1.drop(2), x2.drop(2))
+    }
 }