refactor math utility

src/commonMain/kotlin/com/infendro/hash/blake2/Blake2s.kt

@@ -4,7 +4,7 @@ import com.infendro.bytes.ByteOrder.LITTLE_ENDIAN
 import com.infendro.bytes.bytearray.copyInto
 import com.infendro.bytes.intarray.toByteArray
 import com.infendro.hash.HashFunction
-import com.infendro.hash.util.ceilPow2
+import com.infendro.hash.util.align
 
 class Blake2s(
     override val bytes: Int,
@@ -53,7 +53,7 @@ class Blake2s(
     }
 
     private fun pad(value: ByteArray): ByteArray {
-        val size = maxOf(ceilPow2(value.size, block), block)
+        val size = maxOf(value.size.align(block), block)
         val result = ByteArray(size)
         value.copyInto(result)
         return result