remove unsigned support

src/commonMain/kotlin/com/infendro/hash/sha2/SHA-256.kt

@@ -13,32 +13,31 @@ object `SHA-256` : HashFunction {
     override val block: Int
         get() = 64
 
-    private val initial = uintArrayOf(
-        0x6a09e667U, 0xbb67ae85U,
-        0x3c6ef372U, 0xa54ff53aU,
-        0x510e527fU, 0x9b05688cU,
-        0x1f83d9abU, 0x5be0cd19U,
-    ).asIntArray()
+    private val initial = intArrayOf(
+        +0x6a09e667, -0x4498517b,
+        +0x3c6ef372, -0x5ab00ac6,
+        +0x510e527f, -0x64fa9774,
+        +0x1f83d9ab, +0x5be0cd19,
+    )
 
-    private val c = uintArrayOf(
-        0x428a2f98U, 0x71374491U, 0xb5c0fbcfU, 0xe9b5dba5U, 0x3956c25bU, 0x59f111f1U, 0x923f82a4U, 0xab1c5ed5U,
-        0xd807aa98U, 0x12835b01U, 0x243185beU, 0x550c7dc3U, 0x72be5d74U, 0x80deb1feU, 0x9bdc06a7U, 0xc19bf174U,
-        0xe49b69c1U, 0xefbe4786U, 0x0fc19dc6U, 0x240ca1ccU, 0x2de92c6fU, 0x4a7484aaU, 0x5cb0a9dcU, 0x76f988daU,
-        0x983e5152U, 0xa831c66dU, 0xb00327c8U, 0xbf597fc7U, 0xc6e00bf3U, 0xd5a79147U, 0x06ca6351U, 0x14292967U,
-        0x27b70a85U, 0x2e1b2138U, 0x4d2c6dfcU, 0x53380d13U, 0x650a7354U, 0x766a0abbU, 0x81c2c92eU, 0x92722c85U,
-        0xa2bfe8a1U, 0xa81a664bU, 0xc24b8b70U, 0xc76c51a3U, 0xd192e819U, 0xd6990624U, 0xf40e3585U, 0x106aa070U,
-        0x19a4c116U, 0x1e376c08U, 0x2748774cU, 0x34b0bcb5U, 0x391c0cb3U, 0x4ed8aa4aU, 0x5b9cca4fU, 0x682e6ff3U,
-        0x748f82eeU, 0x78a5636fU, 0x84c87814U, 0x8cc70208U, 0x90befffaU, 0xa4506cebU, 0xbef9a3f7U, 0xc67178f2U,
-    ).asIntArray()
+    private val c = intArrayOf(
+        +0x428a2f98, +0x71374491, -0x4a3f0431, -0x164a245b, +0x3956c25b, +0x59f111f1, -0x6dc07d5c, -0x54e3a12b,
+        -0x27f85568, +0x12835b01, +0x243185be, +0x550c7dc3, +0x72be5d74, -0x7f214e02, -0x6423f959, -0x3e640e8c,
+        -0x1b64963f, -0x1041b87a, +0x0fc19dc6, +0x240ca1cc, +0x2de92c6f, +0x4a7484aa, +0x5cb0a9dc, +0x76f988da,
+        -0x67c1aeae, -0x57ce3993, -0x4ffcd838, -0x40a68039, -0x391ff40d, -0x2a586eb9, +0x06ca6351, +0x14292967,
+        +0x27b70a85, +0x2e1b2138, +0x4d2c6dfc, +0x53380d13, +0x650a7354, +0x766a0abb, -0x7e3d36d2, -0x6d8dd37b,
+        -0x5d40175f, -0x57e599b5, -0x3db47490, -0x3893ae5d, -0x2e6d17e7, -0x2966f9dc, -0x0bf1ca7b, +0x106aa070,
+        +0x19a4c116, +0x1e376c08, +0x2748774c, +0x34b0bcb5, +0x391c0cb3, +0x4ed8aa4a, +0x5b9cca4f, +0x682e6ff3,
+        +0x748f82ee, +0x78a5636f, -0x7b3787ec, -0x7338fdf8, -0x6f410006, -0x5baf9315, -0x41065c09, -0x398e870e,
+    )
 
     override fun hashInto(value: ByteArray, destination: ByteArray, destinationOffset: Int) {
         val input = pad(value)
         val h = initial.copyOf()
-        val w = IntArray(64)
-        val v = IntArray(8)
 
         for (i in input.indices step block) {
-            process(h, input, i, w, v)
+            val block = input.sliceArray(i..<(i + block))
+            process(h, block)
         }
         h.copyInto(destination, destinationOffset)
     }
@@ -54,14 +53,15 @@ object `SHA-256` : HashFunction {
         }
     }
 
-    internal fun process(h: IntArray, value: ByteArray, offset: Int, w: IntArray, v: IntArray) {
-        value.copyInto(w, startIndex = offset, endIndex = offset + block)
+    internal fun process(h: IntArray, block: ByteArray) {
+        val w = IntArray(64)
+        block.copyInto(w)
         for (i in 16..<64) {
             val s0 = w[i - 15].rotateRight(7) xor w[i - 15].rotateRight(18) xor (w[i - 15] ushr 3)
             val s1 = w[i - 2].rotateRight(17) xor w[i - 2].rotateRight(19) xor (w[i - 2] ushr 10)
             w[i] = (w[i - 16] + s0 + w[i - 7] + s1)
         }
-        h.copyInto(v)
+        val v = h.copyOf()
 
         repeat(64) { i ->
             val s0 = v[0].rotateRight(2) xor v[0].rotateRight(13) xor v[0].rotateRight(22)