Implement streaming API

src/commonMain/kotlin/com/infendro/hash/blake/Blake-224.kt

@@ -1,46 +1,85 @@
 package com.infendro.hash.blake
 
+import com.infendro.bytes.bytearray.copyInto
 import com.infendro.bytes.intarray.copyInto
-import com.infendro.bytes.long.copyInto
 import com.infendro.hash.HashFunction
-import com.infendro.hash.util.align
+import com.infendro.hash.blake.`Blake-256`.Companion.c
+import com.infendro.hash.blake.`Blake-256`.Companion.sigma
 
-object `Blake-224` : HashFunction {
-    override val bytes: Int
-        get() = 28
+class `Blake-224` : HashFunction(28, 64) {
+    private val h = initial.copyOf()
 
-    override val block: Int
-        get() = 64
+    private val m = IntArray(16)
+    private val v = IntArray(16)
 
-    private val initial = intArrayOf(
-        -0x3efa6128, +0x367cd507,
-        +0x3070dd17, -0x08f1a6c7,
-        -0x003ff4cf, +0x68581511,
-        +0x64f98fa7, -0x4105b05c,
-    )
-
-    override fun hashInto(value: ByteArray, destination: ByteArray, destinationOffset: Int) {
-        val length = value.size * 8L
-        val input = pad(value)
-        val h = initial.copyOf()
-        var t = 0
-
-        for (i in input.indices step block) {
-            t += minOf(length - t, 512).toInt()
-            val block = input.sliceArray(i..<(i + block))
-            `Blake-256`.compress(h, block, t)
-        }
-        h.copyInto(destination, destinationOffset, endIndex = 7)
+    override fun reset() {
+        super.reset()
+        initial.copyInto(h)
     }
 
-    private fun pad(value: ByteArray): ByteArray {
-        val length = value.size * 8L
+    override fun process() = compress(buffer.value, length * 8L)
 
-        val size = (value.size + 9).align(block)
-        return ByteArray(size).also {
-            value.copyInto(it)
-            it[value.size] = -0x80
-            length.copyInto(it, size - 8)
+    private fun finalize() {
+        buffer.append(0x80.toByte())
+        if (buffer.free < 8) {
+            process()
+            buffer.reset()
         }
+        buffer.jumpTo(56)
+        buffer.append(length * 8L)
+
+        process()
+    }
+
+    override fun digestInto(destination: ByteArray, destinationOffset: Int) {
+        finalize()
+        h.copyInto(destination, destinationOffset, endIndex = 7)
+        reset()
+    }
+
+    private fun compress(block: ByteArray, t: Long) {
+        block.copyInto(m)
+        for (i in 0..<8) v[i] = h[i]
+        for (i in 0..<4) v[i + 8] = c[i]
+        for (i in 0..<2) v[i + 12] = c[i + 4] xor t.toInt()
+        for (i in 0..<2) v[i + 14] = c[i + 6] xor (t ushr 32).toInt()
+
+        repeat(14) { r ->
+            val s = sigma[r % 10]
+
+            g(v, 0, 4, 8, 12, m[s[0]] xor c[s[1]], m[s[1]] xor c[s[0]])
+            g(v, 1, 5, 9, 13, m[s[2]] xor c[s[3]], m[s[3]] xor c[s[2]])
+            g(v, 2, 6, 10, 14, m[s[4]] xor c[s[5]], m[s[5]] xor c[s[4]])
+            g(v, 3, 7, 11, 15, m[s[6]] xor c[s[7]], m[s[7]] xor c[s[6]])
+
+            g(v, 0, 5, 10, 15, m[s[8]] xor c[s[9]], m[s[9]] xor c[s[8]])
+            g(v, 1, 6, 11, 12, m[s[10]] xor c[s[11]], m[s[11]] xor c[s[10]])
+            g(v, 2, 7, 8, 13, m[s[12]] xor c[s[13]], m[s[13]] xor c[s[12]])
+            g(v, 3, 4, 9, 14, m[s[14]] xor c[s[15]], m[s[15]] xor c[s[14]])
+        }
+
+        for (i in 0..<8) {
+            h[i] = h[i] xor v[i] xor v[i + 8]
+        }
+    }
+
+    private fun g(v: IntArray, a: Int, b: Int, c: Int, d: Int, x: Int, y: Int) {
+        v[a] += v[b] + x
+        v[d] = (v[d] xor v[a]).rotateRight(16)
+        v[c] += v[d]
+        v[b] = (v[b] xor v[c]).rotateRight(12)
+        v[a] += v[b] + y
+        v[d] = (v[d] xor v[a]).rotateRight(8)
+        v[c] += v[d]
+        v[b] = (v[b] xor v[c]).rotateRight(7)
+    }
+
+    companion object {
+        private val initial = intArrayOf(
+            -0x3efa6128, +0x367cd507,
+            +0x3070dd17, -0x08f1a6c7,
+            -0x003ff4cf, +0x68581511,
+            +0x64f98fa7, -0x4105b05c,
+        )
     }
 }