remove unsigned support

src/commonMain/kotlin/com/infendro/hash/sha2/SHA-384.kt

@@ -10,21 +10,20 @@ object `SHA-384` : HashFunction {
     override val block: Int
         get() = 128
 
-    private val initial = ulongArrayOf(
-        0xcbbb9d5dc1059ed8UL, 0x629a292a367cd507UL,
-        0x9159015a3070dd17UL, 0x152fecd8f70e5939UL,
-        0x67332667ffc00b31UL, 0x8eb44a8768581511UL,
-        0xdb0c2e0d64f98fa7UL, 0x47b5481dbefa4fa4UL,
-    ).asLongArray()
+    private val initial = longArrayOf(
+        -0x344462a23efa6128L, +0x629a292a367cd507L,
+        -0x6ea6fea5cf8f22e9L, +0x152fecd8f70e5939L,
+        +0x67332667ffc00b31L, -0x714bb57897a7eaefL,
+        -0x24f3d1f29b067059L, +0x47b5481dbefa4fa4L,
+    )
 
     override fun hashInto(value: ByteArray, destination: ByteArray, destinationOffset: Int) {
         val input = `SHA-512`.pad(value)
         val h = initial.copyOf()
-        val w = LongArray(80)
-        val v = LongArray(8)
 
         for (i in input.indices step block) {
-            `SHA-512`.process(h, input, i, w, v)
+            val block = input.sliceArray(i..<(i + block))
+            `SHA-512`.process(h, block)
         }
         h.copyInto(destination, destinationOffset, endIndex = 6)
     }