remove unsigned support

src/commonMain/kotlin/com/infendro/hash/sha2/SHA-224.kt

@@ -10,21 +10,20 @@ object `SHA-224` : HashFunction {
     override val block: Int
         get() = 64
 
-    private val initial = uintArrayOf(
-        0xc1059ed8U, 0x367cd507U,
-        0x3070dd17U, 0xf70e5939U,
-        0xffc00b31U, 0x68581511U,
-        0x64f98fa7U, 0xbefa4fa4U,
-    ).asIntArray()
+    private val initial = intArrayOf(
+        -0x3efa6128, +0x367cd507,
+        +0x3070dd17, -0x08f1a6c7,
+        -0x003ff4cf, +0x68581511,
+        +0x64f98fa7, -0x4105b05c,
+    )
 
     override fun hashInto(value: ByteArray, destination: ByteArray, destinationOffset: Int) {
         val input = `SHA-256`.pad(value)
         val h = initial.copyOf()
-        val w = IntArray(64)
-        val v = IntArray(8)
 
         for (i in input.indices step block) {
-            `SHA-256`.process(h, input, i, w, v)
+            val block = input.sliceArray(i..<(i + block))
+            `SHA-256`.process(h, block)
         }
         h.copyInto(destination, destinationOffset, endIndex = 7)
     }