implement tests

also fix MD5

src/commonMain/kotlin/com/infendro/hash/keccak/Keccak.kt

@@ -6,12 +6,13 @@ import com.infendro.bytearray.toULongArray
 import com.infendro.hash.HashFunction
 import kotlin.math.min
 
-@Suppress("UNUSED")
-open class Keccak internal constructor(
-    override val bytes: Int,
-    override val block: Int,
+abstract class Keccak internal constructor(
+    private val rate: Int,
     private val domain: UByte,
 ) : HashFunction() {
+    override val block: Int
+        get() = rate
+
     private val rc = ulongArrayOf(
         0x0000000000000001UL, 0x0000000000008082UL, 0x800000000000808aUL, 0x8000000080008000UL,
         0x000000000000808bUL, 0x0000000080000001UL, 0x8000000080008081UL, 0x8000000000008009UL,
@@ -35,7 +36,7 @@ open class Keccak internal constructor(
         val paddedValue = buildList {
             addAll(value)
             add(domain)
-            while ((size % block) != (block - 1)) {
+            while ((size % rate) != (rate - 1)) {
                 add(0x00U)
             }
             add(0x80U)
@@ -45,7 +46,7 @@ open class Keccak internal constructor(
 
         // absorb
         val chunks = paddedValue
-            .chunked(block) { it.toUByteArray() }
+            .chunked(rate) { it.toUByteArray() }
         for (chunk in chunks) {
             val numbers = chunk.toULongArray(LITTLE_ENDIAN)
             for ((i, number) in numbers.withIndex()) {
@@ -58,7 +59,7 @@ open class Keccak internal constructor(
         return buildList {
             var i = 0
             while (size < bytes) {
-                if (i == block / 8) {
+                if (i == rate / 8) {
                     permute(state)
                     i = 0
                 }