+hash salt derivation for any size. better naming

src/commonTest/kotlin/HashTest.kt

@@ -5,7 +5,10 @@ import net.sergeych.crypto2.Hash
 import net.sergeych.crypto2.initCrypto
 import kotlin.random.Random
 import kotlin.random.nextUBytes
-import kotlin.test.*
+import kotlin.test.Test
+import kotlin.test.assertContentEquals
+import kotlin.test.assertEquals
+import kotlin.test.assertFalse
 
 @Suppress("UNUSED_PARAMETER", "UNUSED_VARIABLE")
 suspend fun <T> sw(label: String, f: suspend () -> T): T {
@@ -46,5 +49,21 @@ class HashTest {
         assertContentEquals(Hash.Blake2b.digest(a), p1)
         assertContentEquals(Hash.Sha3_384.digest(a), p2)
     }
+
+    @Test
+    fun deriveSaltTest() = runTest {
+        initCrypto()
+        for( i in 2..257 ) {
+            val x = Hash.Sha3AndBlake.deriveSalt("base one", i)
+            val y = Hash.Sha3AndBlake.deriveSalt("base one", i)
+            val z = Hash.Sha3AndBlake.deriveSalt("base two", i)
+            assertContentEquals(x, y)
+            assertFalse { x contentEquals z }
+            assertEquals(x.size, i)
+            assertEquals(y.size, i)
+            assertEquals(z.size, i)
+        }
+    }
+
 }