refactor hash functions

2025-12-01 19:13:58 +01:00
parent 10ba03dedc
commit 8a2848e6e3
7 changed files with 341 additions and 392 deletions
--- a/src/commonMain/kotlin/com/infendro/hash/keccak/Keccak.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/keccak/Keccak.kt
@@ -19,7 +19,7 @@ abstract class Keccak internal constructor(
        0x000000000000008aUL, 0x0000000000000088UL, 0x0000000080008009UL, 0x000000008000000aUL,
        0x000000008000808bUL, 0x800000000000008bUL, 0x8000000000008089UL, 0x8000000000008003UL,
        0x8000000000008002UL, 0x8000000000000080UL, 0x000000000000800aUL, 0x800000008000000aUL,
-        0x8000000080008081UL, 0x8000000000008080UL, 0x0000000080000001UL, 0x8000000080008008UL
+        0x8000000080008081UL, 0x8000000000008080UL, 0x0000000080000001UL, 0x8000000080008008UL,
    )

    private val rotation = arrayOf(
@@ -33,6 +33,9 @@ abstract class Keccak internal constructor(
    override fun hash(
        value: UByteArray,
    ): UByteArray {
+        val state = ULongArray(25)
+
+        // padding
        val paddedValue = buildList {
            addAll(value)
            add(domain)
@@ -42,13 +45,11 @@ abstract class Keccak internal constructor(
            add(0x80U)
        }

-        val state = ULongArray(25)
-
        // absorb
-        val chunks = paddedValue
+        val blocks = paddedValue
            .chunked(rate) { it.toUByteArray() }
-        for (chunk in chunks) {
-            val numbers = chunk.toULongArray(LITTLE_ENDIAN)
+        for (block in blocks) {
+            val numbers = block.toULongArray(LITTLE_ENDIAN)
            for ((i, number) in numbers.withIndex()) {
                state[i] = state[i] xor number
            }
--- a/src/commonMain/kotlin/com/infendro/hash/md/MD5.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/md/MD5.kt
@@ -12,26 +12,23 @@ object MD5 : HashFunction() {
    override val block: Int
        get() = 64

-    private val s = intArrayOf(
-        7, 12, 17, 22,
-        7, 12, 17, 22,
-        7, 12, 17, 22,
-        7, 12, 17, 22,
-        5, 9, 14, 20,
-        5, 9, 14, 20,
-        5, 9, 14, 20,
-        5, 9, 14, 20,
-        4, 11, 16, 23,
-        4, 11, 16, 23,
-        4, 11, 16, 23,
-        4, 11, 16, 23,
-        6, 10, 15, 21,
-        6, 10, 15, 21,
-        6, 10, 15, 21,
-        6, 10, 15, 21,
+    private val initial = uintArrayOf(
+        0x67452301U, 0xefcdab89U,
+        0x98badcfeU, 0x10325476U,
    )

-    private val k = uintArrayOf(
+    private val shifts = intArrayOf(
+        7, 12, 17, 22, 7, 12, 17, 22,
+        7, 12, 17, 22, 7, 12, 17, 22,
+        5, 9, 14, 20, 5, 9, 14, 20,
+        5, 9, 14, 20, 5, 9, 14, 20,
+        4, 11, 16, 23, 4, 11, 16, 23,
+        4, 11, 16, 23, 4, 11, 16, 23,
+        6, 10, 15, 21, 6, 10, 15, 21,
+        6, 10, 15, 21, 6, 10, 15, 21,
+    )
+
+    private val c = uintArrayOf(
        0xd76aa478U, 0xe8c7b756U, 0x242070dbU, 0xc1bdceeeU,
        0xf57c0fafU, 0x4787c62aU, 0xa8304613U, 0xfd469501U,
        0x698098d8U, 0x8b44f7afU, 0xffff5bb1U, 0x895cd7beU,
@@ -53,39 +50,42 @@ object MD5 : HashFunction() {
    override fun hash(
        value: UByteArray,
    ): UByteArray {
-        var a0 = 0x67452301U
-        var b0 = 0xefcdab89U
-        var c0 = 0x98badcfeU
-        var d0 = 0x10325476U
-        val ml = value.size.toULong() * 8UL
+        val h = initial.copyOf()
+        val l = value.size.toULong() * 8UL

+        // padding
        val paddedValue = buildList {
            addAll(value)
            add(0x80U)
            while (size % 64 != 56) {
                add(0x00U)
            }
-            addAll(ml.toUByteArray(LITTLE_ENDIAN))
+            addAll(l.toUByteArray(LITTLE_ENDIAN))
        }

-        val chunks = paddedValue
+        // process
+        val blocks = paddedValue
            .chunked(64) { it.toUByteArray() }
-        for (chunk in chunks) {
-            val w = buildList {
-                addAll(chunk.toUIntArray(LITTLE_ENDIAN))
+        for (block in blocks) {
+            val w = block.toUIntArray(LITTLE_ENDIAN)
+            process(h, w)
        }

-            var a = a0
-            var b = b0
-            var c = c0
-            var d = d0
+        return h.toUByteArray(LITTLE_ENDIAN)
+    }
+
+    private fun process(
+        h: UIntArray,
+        w: UIntArray,
+    ) {
+        val v = h.copyOf()

        for (i in 0..<64) {
-                val f = when (i) {
-                    in 0..15 -> (b and c) or (b.inv() and d)
-                    in 16..31 -> (d and b) or (d.inv() and c)
-                    in 32..47 -> b xor c xor d
-                    else -> c xor (b or d.inv())
+            var f = when (i) {
+                in 0..15 -> (v[1] and v[2]) or (v[1].inv() and v[3])
+                in 16..31 -> (v[3] and v[1]) or (v[3].inv() and v[2])
+                in 32..47 -> v[1] xor v[2] xor v[3]
+                else -> v[2] xor (v[1] or v[3].inv())
            }
            val g = when (i) {
                in 0..15 -> i
@@ -93,24 +93,15 @@ object MD5 : HashFunction() {
                in 32..47 -> (3 * i + 5) % 16
                else -> (7 * i) % 16
            }
-                val temp = a
-                a = d
-                d = c
-                c = b
-                b += (temp + f + k[i] + w[g]).rotateLeft(s[i])
+            f += v[0] + c[i] + w[g]
+            v[0] = v[3]
+            v[3] = v[2]
+            v[2] = v[1]
+            v[1] += f.rotateLeft(shifts[i])
        }

-            a0 += a
-            b0 += b
-            c0 += c
-            d0 += d
-        }
-
-        return ubyteArrayOf(
-            *a0.toUByteArray(LITTLE_ENDIAN),
-            *b0.toUByteArray(LITTLE_ENDIAN),
-            *c0.toUByteArray(LITTLE_ENDIAN),
-            *d0.toUByteArray(LITTLE_ENDIAN),
-        )
+        for (i in 0..3) {
+            h[i] += v[i]
+        }
    }
 }
--- a/src/commonMain/kotlin/com/infendro/hash/sha1/SHA1.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/sha1/SHA1.kt
@@ -11,48 +11,57 @@ object SHA1 : HashFunction() {
    override val block: Int
        get() = 64

+    private val initial = uintArrayOf(
+        0x67452301U, 0xefcdaB89U,
+        0x98badcfeU, 0x10325476U,
+        0xc3d2e1f0U,
+    )
+
    override fun hash(
        value: UByteArray,
    ): UByteArray {
-        var h0 = 0x67452301U
-        var h1 = 0xefcdaB89U
-        var h2 = 0x98badcfeU
-        var h3 = 0x10325476U
-        var h4 = 0xc3d2e1f0U
-        val ml = value.size.toULong() * 8UL
+        val h = initial.copyOf()
+        val l = value.size.toULong() * 8UL

+        // padding
        val paddedValue = buildList {
            addAll(value)
            add(0x80U)
            while (size % 64 != 56) {
                add(0x00U)
            }
-            addAll(ml.toUByteArray())
+            addAll(l.toUByteArray())
        }

-        val chunks = paddedValue
+        // process
+        val blocks = paddedValue
            .chunked(64) { it.toUByteArray() }
-        for (chunk in chunks) {
+        for (block in blocks) {
            val w = buildList {
-                addAll(chunk.toUIntArray())
+                addAll(block.toUIntArray())
                for (i in 16..<80) {
                    val word = (get(i - 3) xor get(i - 8) xor get(i - 14) xor get(i - 16)).rotateLeft(1)
                    add(word)
                }
+            }.toUIntArray()
+            process(h, w)
        }

-            var a = h0
-            var b = h1
-            var c = h2
-            var d = h3
-            var e = h4
+        return h.toUByteArray()
+    }
+
+    private fun process(
+        h: UIntArray,
+        w: UIntArray,
+    ) {
+        val v = h.copyOf()

        for (i in 0..<80) {
            val f = when (i) {
-                    in 0..<20 -> (b and c) or (b.inv() and d)
-                    in 20..<40 -> b xor c xor d
-                    in 40..<60 -> (b and c) or (b and d) or (c and d)
-                    else -> b xor c xor d
+                in 0..<20 -> (v[1] and v[2]) or (v[1].inv() and v[3])
+                in 20..<40 -> v[1] xor v[2] xor v[3]
+                in 40..<60 -> (v[1] and v[2]) or (v[1] and v[3]) or (v[2] and v[3])
+                else -> v[1] xor v[2] xor v[3]
            }
            val k = when (i) {
                in 0..<20 -> 0x5a827999U
@@ -60,27 +69,16 @@ object SHA1 : HashFunction() {
                in 40..<60 -> 0x8f1bbcdcU
                else -> 0xca62c1d6U
            }
-                val temp = a.rotateLeft(5) + f + e + k + w[i]
-                e = d
-                d = c
-                c = b.rotateLeft(30)
-                b = a
-                a = temp
+            val temp = v[0].rotateLeft(5) + f + v[4] + k + w[i]
+            v[4] = v[3]
+            v[3] = v[2]
+            v[2] = v[1].rotateLeft(30)
+            v[1] = v[0]
+            v[0] = temp
        }

-            h0 += a
-            h1 += b
-            h2 += c
-            h3 += d
-            h4 += e
-        }
-
-        return ubyteArrayOf(
-            *h0.toUByteArray(),
-            *h1.toUByteArray(),
-            *h2.toUByteArray(),
-            *h3.toUByteArray(),
-            *h4.toUByteArray(),
-        )
+        for (i in 0..4) {
+            h[i] += v[i]
+        }
    }
 }
--- a/src/commonMain/kotlin/com/infendro/hash/sha2/SHA-224.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/sha2/SHA-224.kt
@@ -11,7 +11,14 @@ object `SHA-224` : HashFunction() {
    override val block: Int
        get() = 64

-    private val k = uintArrayOf(
+    private val initial = uintArrayOf(
+        0xc1059ed8U, 0x367cd507U,
+        0x3070dd17U, 0xf70e5939U,
+        0xffc00b31U, 0x68581511U,
+        0x64f98fa7U, 0xbefa4fa4U,
+    )
+
+    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,
@@ -25,82 +32,63 @@ object `SHA-224` : HashFunction() {
    override fun hash(
        value: UByteArray,
    ): UByteArray {
-        var h0 = 0xc1059ed8U
-        var h1 = 0x367cd507U
-        var h2 = 0x3070dd17U
-        var h3 = 0xf70e5939U
-        var h4 = 0xffc00b31U
-        var h5 = 0x68581511U
-        var h6 = 0x64f98fa7U
-        var h7 = 0xbefa4fa4U
-        val ml = value.size.toULong() * 8UL
+        val h = initial.copyOf()
+        val l = value.size.toULong() * 8UL

+        // padding
        val paddedValue = buildList {
            addAll(value)
            add(0x80U)
            while (size % 64 != 56) {
                add(0x00U)
            }
-            addAll(ml.toUByteArray())
+            addAll(l.toUByteArray())
        }

-        val chunks = paddedValue
+        // process
+        val blocks = paddedValue
            .chunked(64) { it.toUByteArray() }
-        for (chunk in chunks) {
+        for (block in blocks) {
            val w = buildList {
-                addAll(chunk.toUIntArray())
+                addAll(block.toUIntArray())
                for (i in 16..<64) {
                    val s0 = get(i - 15).rotateRight(7) xor get(i - 15).rotateRight(18) xor (get(i - 15) shr 3)
                    val s1 = get(i - 2).rotateRight(17) xor get(i - 2).rotateRight(19) xor (get(i - 2) shr 10)
                    add(get(i - 16) + s0 + get(i - 7) + s1)
                }
+            }.toUIntArray()
+            process(h, w)
        }

-            var a = h0
-            var b = h1
-            var c = h2
-            var d = h3
-            var e = h4
-            var f = h5
-            var g = h6
-            var h = h7
+        return h.sliceArray(0..6).toUByteArray()
+    }
+
+    private fun process(
+        h: UIntArray,
+        w: UIntArray,
+    ) {
+        val v = h.copyOf()

        for (i in 0..<64) {
-                val s0 = a.rotateRight(2) xor a.rotateRight(13) xor a.rotateRight(22)
-                val s1 = e.rotateRight(6) xor e.rotateRight(11) xor e.rotateRight(25)
-                val ch = (e and f) xor (e.inv() and g)
-                val temp1 = h + s1 + ch + k[i] + w[i]
-                val maj = (a and b) xor (a and c) xor (b and c)
+            val s0 = v[0].rotateRight(2) xor v[0].rotateRight(13) xor v[0].rotateRight(22)
+            val s1 = v[4].rotateRight(6) xor v[4].rotateRight(11) xor v[4].rotateRight(25)
+            val ch = (v[4] and v[5]) xor (v[4].inv() and v[6])
+            val temp1 = v[7] + s1 + ch + this.c[i] + w[i]
+            val maj = (v[0] and v[1]) xor (v[0] and v[2]) xor (v[1] and v[2])
            val temp2 = s0 + maj

-                h = g
-                g = f
-                f = e
-                e = d + temp1
-                d = c
-                c = b
-                b = a
-                a = temp1 + temp2
+            v[7] = v[6]
+            v[6] = v[5]
+            v[5] = v[4]
+            v[4] = v[3] + temp1
+            v[3] = v[2]
+            v[2] = v[1]
+            v[1] = v[0]
+            v[0] = temp1 + temp2
        }

-            h0 += a
-            h1 += b
-            h2 += c
-            h3 += d
-            h4 += e
-            h5 += f
-            h6 += g
-            h7 += h
-        }
-
-        return ubyteArrayOf(
-            *h0.toUByteArray(),
-            *h1.toUByteArray(),
-            *h2.toUByteArray(),
-            *h3.toUByteArray(),
-            *h4.toUByteArray(),
-            *h5.toUByteArray(),
-            *h6.toUByteArray(),
-        )
+        for (i in 0..7) {
+            h[i] += v[i]
+        }
    }
 }
--- a/src/commonMain/kotlin/com/infendro/hash/sha2/SHA-256.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/sha2/SHA-256.kt
@@ -11,7 +11,14 @@ object `SHA-256` : HashFunction() {
    override val block: Int
        get() = 64

-    private val k = uintArrayOf(
+    private val initial = uintArrayOf(
+        0x6a09e667U, 0xbb67ae85U,
+        0x3c6ef372U, 0xa54ff53aU,
+        0x510e527fU, 0x9b05688cU,
+        0x1f83d9abU, 0x5be0cd19U,
+    )
+
+    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,
@@ -25,25 +32,20 @@ object `SHA-256` : HashFunction() {
    override fun hash(
        value: UByteArray,
    ): UByteArray {
-        var h0 = 0x6a09e667U
-        var h1 = 0xbb67ae85U
-        var h2 = 0x3c6ef372U
-        var h3 = 0xa54ff53aU
-        var h4 = 0x510e527fU
-        var h5 = 0x9b05688cU
-        var h6 = 0x1f83d9abU
-        var h7 = 0x5be0cd19U
-        val ml = value.size.toULong() * 8UL
+        val h = initial.copyOf()
+        val l = value.size.toULong() * 8UL

+        // padding
        val paddedValue = buildList {
            addAll(value)
            add(0x80U)
            while (size % 64 != 56) {
                add(0x00U)
            }
-            addAll(ml.toUByteArray())
+            addAll(l.toUByteArray())
        }

+        // process
        val chunks = paddedValue
            .chunked(64) { it.toUByteArray() }
        for (chunk in chunks) {
@@ -54,54 +56,39 @@ object `SHA-256` : HashFunction() {
                    val s1 = get(i - 2).rotateRight(17) xor get(i - 2).rotateRight(19) xor (get(i - 2) shr 10)
                    add(get(i - 16) + s0 + get(i - 7) + s1)
                }
+            }.toUIntArray()
+            process(h, w)
        }

-            var a = h0
-            var b = h1
-            var c = h2
-            var d = h3
-            var e = h4
-            var f = h5
-            var g = h6
-            var h = h7
+        return h.toUByteArray()
+    }
+
+    private fun process(
+        h: UIntArray,
+        w: UIntArray,
+    ) {
+        val v = h.copyOf()

        for (i in 0..<64) {
-                val s0 = a.rotateRight(2) xor a.rotateRight(13) xor a.rotateRight(22)
-                val s1 = e.rotateRight(6) xor e.rotateRight(11) xor e.rotateRight(25)
-                val ch = (e and f) xor (e.inv() and g)
-                val temp1 = h + s1 + ch + k[i] + w[i]
-                val maj = (a and b) xor (a and c) xor (b and c)
+            val s0 = v[0].rotateRight(2) xor v[0].rotateRight(13) xor v[0].rotateRight(22)
+            val s1 = v[4].rotateRight(6) xor v[4].rotateRight(11) xor v[4].rotateRight(25)
+            val ch = (v[4] and v[5]) xor (v[4].inv() and v[6])
+            val temp1 = v[7] + s1 + ch + this.c[i] + w[i]
+            val maj = (v[0] and v[1]) xor (v[0] and v[2]) xor (v[1] and v[2])
            val temp2 = s0 + maj

-                h = g
-                g = f
-                f = e
-                e = d + temp1
-                d = c
-                c = b
-                b = a
-                a = temp1 + temp2
+            v[7] = v[6]
+            v[6] = v[5]
+            v[5] = v[4]
+            v[4] = v[3] + temp1
+            v[3] = v[2]
+            v[2] = v[1]
+            v[1] = v[0]
+            v[0] = temp1 + temp2
        }

-            h0 += a
-            h1 += b
-            h2 += c
-            h3 += d
-            h4 += e
-            h5 += f
-            h6 += g
-            h7 += h
-        }
-
-        return ubyteArrayOf(
-            *h0.toUByteArray(),
-            *h1.toUByteArray(),
-            *h2.toUByteArray(),
-            *h3.toUByteArray(),
-            *h4.toUByteArray(),
-            *h5.toUByteArray(),
-            *h6.toUByteArray(),
-            *h7.toUByteArray(),
-        )
+        for (i in 0..7) {
+            h[i] += v[i]
+        }
    }
 }
--- a/src/commonMain/kotlin/com/infendro/hash/sha2/SHA-384.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/sha2/SHA-384.kt
@@ -11,103 +11,96 @@ object `SHA-384` : HashFunction() {
    override val block: Int
        get() = 128

-    private val k = ulongArrayOf(
-        0x428a2f98d728ae22UL, 0x7137449123ef65cdUL, 0xb5c0fbcfec4d3b2fUL, 0xe9b5dba58189dbbcUL, 0x3956c25bf348b538UL,
-        0x59f111f1b605d019UL, 0x923f82a4af194f9bUL, 0xab1c5ed5da6d8118UL, 0xd807aa98a3030242UL, 0x12835b0145706fbeUL,
-        0x243185be4ee4b28cUL, 0x550c7dc3d5ffb4e2UL, 0x72be5d74f27b896fUL, 0x80deb1fe3b1696b1UL, 0x9bdc06a725c71235UL,
-        0xc19bf174cf692694UL, 0xe49b69c19ef14ad2UL, 0xefbe4786384f25e3UL, 0x0fc19dc68b8cd5b5UL, 0x240ca1cc77ac9c65UL,
-        0x2de92c6f592b0275UL, 0x4a7484aa6ea6e483UL, 0x5cb0a9dcbd41fbd4UL, 0x76f988da831153b5UL, 0x983e5152ee66dfabUL,
-        0xa831c66d2db43210UL, 0xb00327c898fb213fUL, 0xbf597fc7beef0ee4UL, 0xc6e00bf33da88fc2UL, 0xd5a79147930aa725UL,
-        0x06ca6351e003826fUL, 0x142929670a0e6e70UL, 0x27b70a8546d22ffcUL, 0x2e1b21385c26c926UL, 0x4d2c6dfc5ac42aedUL,
-        0x53380d139d95b3dfUL, 0x650a73548baf63deUL, 0x766a0abb3c77b2a8UL, 0x81c2c92e47edaee6UL, 0x92722c851482353bUL,
-        0xa2bfe8a14cf10364UL, 0xa81a664bbc423001UL, 0xc24b8b70d0f89791UL, 0xc76c51a30654be30UL, 0xd192e819d6ef5218UL,
-        0xd69906245565a910UL, 0xf40e35855771202aUL, 0x106aa07032bbd1b8UL, 0x19a4c116b8d2d0c8UL, 0x1e376c085141ab53UL,
-        0x2748774cdf8eeb99UL, 0x34b0bcb5e19b48a8UL, 0x391c0cb3c5c95a63UL, 0x4ed8aa4ae3418acbUL, 0x5b9cca4f7763e373UL,
-        0x682e6ff3d6b2b8a3UL, 0x748f82ee5defb2fcUL, 0x78a5636f43172f60UL, 0x84c87814a1f0ab72UL, 0x8cc702081a6439ecUL,
-        0x90befffa23631e28UL, 0xa4506cebde82bde9UL, 0xbef9a3f7b2c67915UL, 0xc67178f2e372532bUL, 0xca273eceea26619cUL,
-        0xd186b8c721c0c207UL, 0xeada7dd6cde0eb1eUL, 0xf57d4f7fee6ed178UL, 0x06f067aa72176fbaUL, 0x0a637dc5a2c898a6UL,
-        0x113f9804bef90daeUL, 0x1b710b35131c471bUL, 0x28db77f523047d84UL, 0x32caab7b40c72493UL, 0x3c9ebe0a15c9bebcUL,
-        0x431d67c49c100d4cUL, 0x4cc5d4becb3e42b6UL, 0x597f299cfc657e2aUL, 0x5fcb6fab3ad6faecUL, 0x6c44198c4a475817UL,
+    private val initial = ulongArrayOf(
+        0xcbbb9d5dc1059ed8UL, 0x629a292a367cd507UL,
+        0x9159015a3070dd17UL, 0x152fecd8f70e5939UL,
+        0x67332667ffc00b31UL, 0x8eb44a8768581511UL,
+        0xdb0c2e0d64f98fa7UL, 0x47b5481dbefa4fa4UL,
+    )
+
+    private val c = ulongArrayOf(
+        0x428a2f98d728ae22UL, 0x7137449123ef65cdUL, 0xb5c0fbcfec4d3b2fUL, 0xe9b5dba58189dbbcUL,
+        0x3956c25bf348b538UL, 0x59f111f1b605d019UL, 0x923f82a4af194f9bUL, 0xab1c5ed5da6d8118UL,
+        0xd807aa98a3030242UL, 0x12835b0145706fbeUL, 0x243185be4ee4b28cUL, 0x550c7dc3d5ffb4e2UL,
+        0x72be5d74f27b896fUL, 0x80deb1fe3b1696b1UL, 0x9bdc06a725c71235UL, 0xc19bf174cf692694UL,
+        0xe49b69c19ef14ad2UL, 0xefbe4786384f25e3UL, 0x0fc19dc68b8cd5b5UL, 0x240ca1cc77ac9c65UL,
+        0x2de92c6f592b0275UL, 0x4a7484aa6ea6e483UL, 0x5cb0a9dcbd41fbd4UL, 0x76f988da831153b5UL,
+        0x983e5152ee66dfabUL, 0xa831c66d2db43210UL, 0xb00327c898fb213fUL, 0xbf597fc7beef0ee4UL,
+        0xc6e00bf33da88fc2UL, 0xd5a79147930aa725UL, 0x06ca6351e003826fUL, 0x142929670a0e6e70UL,
+        0x27b70a8546d22ffcUL, 0x2e1b21385c26c926UL, 0x4d2c6dfc5ac42aedUL, 0x53380d139d95b3dfUL,
+        0x650a73548baf63deUL, 0x766a0abb3c77b2a8UL, 0x81c2c92e47edaee6UL, 0x92722c851482353bUL,
+        0xa2bfe8a14cf10364UL, 0xa81a664bbc423001UL, 0xc24b8b70d0f89791UL, 0xc76c51a30654be30UL,
+        0xd192e819d6ef5218UL, 0xd69906245565a910UL, 0xf40e35855771202aUL, 0x106aa07032bbd1b8UL,
+        0x19a4c116b8d2d0c8UL, 0x1e376c085141ab53UL, 0x2748774cdf8eeb99UL, 0x34b0bcb5e19b48a8UL,
+        0x391c0cb3c5c95a63UL, 0x4ed8aa4ae3418acbUL, 0x5b9cca4f7763e373UL, 0x682e6ff3d6b2b8a3UL,
+        0x748f82ee5defb2fcUL, 0x78a5636f43172f60UL, 0x84c87814a1f0ab72UL, 0x8cc702081a6439ecUL,
+        0x90befffa23631e28UL, 0xa4506cebde82bde9UL, 0xbef9a3f7b2c67915UL, 0xc67178f2e372532bUL,
+        0xca273eceea26619cUL, 0xd186b8c721c0c207UL, 0xeada7dd6cde0eb1eUL, 0xf57d4f7fee6ed178UL,
+        0x06f067aa72176fbaUL, 0x0a637dc5a2c898a6UL, 0x113f9804bef90daeUL, 0x1b710b35131c471bUL,
+        0x28db77f523047d84UL, 0x32caab7b40c72493UL, 0x3c9ebe0a15c9bebcUL, 0x431d67c49c100d4cUL,
+        0x4cc5d4becb3e42b6UL, 0x597f299cfc657e2aUL, 0x5fcb6fab3ad6faecUL, 0x6c44198c4a475817UL,
    )

    override fun hash(
        value: UByteArray,
    ): UByteArray {
-        var h0 = 0xcbbb9d5dc1059ed8UL
-        var h1 = 0x629a292a367cd507UL
-        var h2 = 0x9159015a3070dd17UL
-        var h3 = 0x152fecd8f70e5939UL
-        var h4 = 0x67332667ffc00b31UL
-        var h5 = 0x8eb44a8768581511UL
-        var h6 = 0xdb0c2e0d64f98fa7UL
-        var h7 = 0x47b5481dbefa4fa4UL
-        val ml = value.size.toULong() * 8UL
+        val h = initial.copyOf()
+        val l = value.size.toULong() * 8UL

+        // padding
        val paddedValue = buildList {
            addAll(value)
            add(0x80U)
            while (size % 128 != 120) {
                add(0x00U)
            }
-            addAll(ml.toUByteArray())
+            addAll(l.toUByteArray())
        }

-        val chunks = paddedValue
+        // process
+        val blocks = paddedValue
            .chunked(128) { it.toUByteArray() }
-        for (chunk in chunks) {
+        for (block in blocks) {
            val w = buildList {
-                addAll(chunk.toULongArray())
+                addAll(block.toULongArray())
                for (i in 16..<80) {
                    val s0 = get(i - 15).rotateRight(1) xor get(i - 15).rotateRight(8) xor (get(i - 15) shr 7)
                    val s1 = get(i - 2).rotateRight(19) xor get(i - 2).rotateRight(61) xor (get(i - 2) shr 6)
                    add(get(i - 16) + s0 + get(i - 7) + s1)
                }
+            }.toULongArray()
+            process(h, w)
        }

-            var a = h0
-            var b = h1
-            var c = h2
-            var d = h3
-            var e = h4
-            var f = h5
-            var g = h6
-            var h = h7
+        return h.sliceArray(0..5).toUByteArray()
+    }
+
+    private fun process(
+        h: ULongArray,
+        w: ULongArray,
+    ) {
+        val v = h.copyOf()

        for (i in 0..<80) {
-                val s0 = a.rotateRight(28) xor a.rotateRight(34) xor a.rotateRight(39)
-                val s1 = e.rotateRight(14) xor e.rotateRight(18) xor e.rotateRight(41)
-                val ch = (e and f) xor (e.inv() and g)
-                val temp1 = h + s1 + ch + k[i] + w[i]
-                val maj = (a and b) xor (a and c) xor (b and c)
+            val s0 = v[0].rotateRight(28) xor v[0].rotateRight(34) xor v[0].rotateRight(39)
+            val s1 = v[4].rotateRight(14) xor v[4].rotateRight(18) xor v[4].rotateRight(41)
+            val ch = (v[4] and v[5]) xor (v[4].inv() and v[6])
+            val temp1 = v[7] + s1 + ch + this.c[i] + w[i]
+            val maj = (v[0] and v[1]) xor (v[0] and v[2]) xor (v[1] and v[2])
            val temp2 = s0 + maj

-                h = g
-                g = f
-                f = e
-                e = d + temp1
-                d = c
-                c = b
-                b = a
-                a = temp1 + temp2
+            v[7] = v[6]
+            v[6] = v[5]
+            v[5] = v[4]
+            v[4] = v[3] + temp1
+            v[3] = v[2]
+            v[2] = v[1]
+            v[1] = v[0]
+            v[0] = temp1 + temp2
        }

-            h0 += a
-            h1 += b
-            h2 += c
-            h3 += d
-            h4 += e
-            h5 += f
-            h6 += g
-            h7 += h
-        }
-
-        return ubyteArrayOf(
-            *h0.toUByteArray(),
-            *h1.toUByteArray(),
-            *h2.toUByteArray(),
-            *h3.toUByteArray(),
-            *h4.toUByteArray(),
-            *h5.toUByteArray(),
-        )
+        for (i in 0..7) {
+            h[i] += v[i]
+        }
    }
 }
--- a/src/commonMain/kotlin/com/infendro/hash/sha2/SHA-512.kt
+++ b/src/commonMain/kotlin/com/infendro/hash/sha2/SHA-512.kt
@@ -11,105 +11,96 @@ object `SHA-512` : HashFunction() {
    override val block: Int
        get() = 128

-    private val k = ulongArrayOf(
-        0x428a2f98d728ae22UL, 0x7137449123ef65cdUL, 0xb5c0fbcfec4d3b2fUL, 0xe9b5dba58189dbbcUL, 0x3956c25bf348b538UL,
-        0x59f111f1b605d019UL, 0x923f82a4af194f9bUL, 0xab1c5ed5da6d8118UL, 0xd807aa98a3030242UL, 0x12835b0145706fbeUL,
-        0x243185be4ee4b28cUL, 0x550c7dc3d5ffb4e2UL, 0x72be5d74f27b896fUL, 0x80deb1fe3b1696b1UL, 0x9bdc06a725c71235UL,
-        0xc19bf174cf692694UL, 0xe49b69c19ef14ad2UL, 0xefbe4786384f25e3UL, 0x0fc19dc68b8cd5b5UL, 0x240ca1cc77ac9c65UL,
-        0x2de92c6f592b0275UL, 0x4a7484aa6ea6e483UL, 0x5cb0a9dcbd41fbd4UL, 0x76f988da831153b5UL, 0x983e5152ee66dfabUL,
-        0xa831c66d2db43210UL, 0xb00327c898fb213fUL, 0xbf597fc7beef0ee4UL, 0xc6e00bf33da88fc2UL, 0xd5a79147930aa725UL,
-        0x06ca6351e003826fUL, 0x142929670a0e6e70UL, 0x27b70a8546d22ffcUL, 0x2e1b21385c26c926UL, 0x4d2c6dfc5ac42aedUL,
-        0x53380d139d95b3dfUL, 0x650a73548baf63deUL, 0x766a0abb3c77b2a8UL, 0x81c2c92e47edaee6UL, 0x92722c851482353bUL,
-        0xa2bfe8a14cf10364UL, 0xa81a664bbc423001UL, 0xc24b8b70d0f89791UL, 0xc76c51a30654be30UL, 0xd192e819d6ef5218UL,
-        0xd69906245565a910UL, 0xf40e35855771202aUL, 0x106aa07032bbd1b8UL, 0x19a4c116b8d2d0c8UL, 0x1e376c085141ab53UL,
-        0x2748774cdf8eeb99UL, 0x34b0bcb5e19b48a8UL, 0x391c0cb3c5c95a63UL, 0x4ed8aa4ae3418acbUL, 0x5b9cca4f7763e373UL,
-        0x682e6ff3d6b2b8a3UL, 0x748f82ee5defb2fcUL, 0x78a5636f43172f60UL, 0x84c87814a1f0ab72UL, 0x8cc702081a6439ecUL,
-        0x90befffa23631e28UL, 0xa4506cebde82bde9UL, 0xbef9a3f7b2c67915UL, 0xc67178f2e372532bUL, 0xca273eceea26619cUL,
-        0xd186b8c721c0c207UL, 0xeada7dd6cde0eb1eUL, 0xf57d4f7fee6ed178UL, 0x06f067aa72176fbaUL, 0x0a637dc5a2c898a6UL,
-        0x113f9804bef90daeUL, 0x1b710b35131c471bUL, 0x28db77f523047d84UL, 0x32caab7b40c72493UL, 0x3c9ebe0a15c9bebcUL,
-        0x431d67c49c100d4cUL, 0x4cc5d4becb3e42b6UL, 0x597f299cfc657e2aUL, 0x5fcb6fab3ad6faecUL, 0x6c44198c4a475817UL,
+    private val initial = ulongArrayOf(
+        0x6a09e667f3bcc908UL, 0xbb67ae8584caa73bUL,
+        0x3c6ef372fe94f82bUL, 0xa54ff53a5f1d36f1UL,
+        0x510e527fade682d1UL, 0x9b05688c2b3e6c1fUL,
+        0x1f83d9abfb41bd6bUL, 0x5be0cd19137e2179UL,
+    )
+
+    private val c = ulongArrayOf(
+        0x428a2f98d728ae22UL, 0x7137449123ef65cdUL, 0xb5c0fbcfec4d3b2fUL, 0xe9b5dba58189dbbcUL,
+        0x3956c25bf348b538UL, 0x59f111f1b605d019UL, 0x923f82a4af194f9bUL, 0xab1c5ed5da6d8118UL,
+        0xd807aa98a3030242UL, 0x12835b0145706fbeUL, 0x243185be4ee4b28cUL, 0x550c7dc3d5ffb4e2UL,
+        0x72be5d74f27b896fUL, 0x80deb1fe3b1696b1UL, 0x9bdc06a725c71235UL, 0xc19bf174cf692694UL,
+        0xe49b69c19ef14ad2UL, 0xefbe4786384f25e3UL, 0x0fc19dc68b8cd5b5UL, 0x240ca1cc77ac9c65UL,
+        0x2de92c6f592b0275UL, 0x4a7484aa6ea6e483UL, 0x5cb0a9dcbd41fbd4UL, 0x76f988da831153b5UL,
+        0x983e5152ee66dfabUL, 0xa831c66d2db43210UL, 0xb00327c898fb213fUL, 0xbf597fc7beef0ee4UL,
+        0xc6e00bf33da88fc2UL, 0xd5a79147930aa725UL, 0x06ca6351e003826fUL, 0x142929670a0e6e70UL,
+        0x27b70a8546d22ffcUL, 0x2e1b21385c26c926UL, 0x4d2c6dfc5ac42aedUL, 0x53380d139d95b3dfUL,
+        0x650a73548baf63deUL, 0x766a0abb3c77b2a8UL, 0x81c2c92e47edaee6UL, 0x92722c851482353bUL,
+        0xa2bfe8a14cf10364UL, 0xa81a664bbc423001UL, 0xc24b8b70d0f89791UL, 0xc76c51a30654be30UL,
+        0xd192e819d6ef5218UL, 0xd69906245565a910UL, 0xf40e35855771202aUL, 0x106aa07032bbd1b8UL,
+        0x19a4c116b8d2d0c8UL, 0x1e376c085141ab53UL, 0x2748774cdf8eeb99UL, 0x34b0bcb5e19b48a8UL,
+        0x391c0cb3c5c95a63UL, 0x4ed8aa4ae3418acbUL, 0x5b9cca4f7763e373UL, 0x682e6ff3d6b2b8a3UL,
+        0x748f82ee5defb2fcUL, 0x78a5636f43172f60UL, 0x84c87814a1f0ab72UL, 0x8cc702081a6439ecUL,
+        0x90befffa23631e28UL, 0xa4506cebde82bde9UL, 0xbef9a3f7b2c67915UL, 0xc67178f2e372532bUL,
+        0xca273eceea26619cUL, 0xd186b8c721c0c207UL, 0xeada7dd6cde0eb1eUL, 0xf57d4f7fee6ed178UL,
+        0x06f067aa72176fbaUL, 0x0a637dc5a2c898a6UL, 0x113f9804bef90daeUL, 0x1b710b35131c471bUL,
+        0x28db77f523047d84UL, 0x32caab7b40c72493UL, 0x3c9ebe0a15c9bebcUL, 0x431d67c49c100d4cUL,
+        0x4cc5d4becb3e42b6UL, 0x597f299cfc657e2aUL, 0x5fcb6fab3ad6faecUL, 0x6c44198c4a475817UL,
    )

    override fun hash(
        value: UByteArray,
    ): UByteArray {
-        var h0 = 0x6a09e667f3bcc908UL
-        var h1 = 0xbb67ae8584caa73bUL
-        var h2 = 0x3c6ef372fe94f82bUL
-        var h3 = 0xa54ff53a5f1d36f1UL
-        var h4 = 0x510e527fade682d1UL
-        var h5 = 0x9b05688c2b3e6c1fUL
-        var h6 = 0x1f83d9abfb41bd6bUL
-        var h7 = 0x5be0cd19137e2179UL
-        val ml = value.size.toULong() * 8UL
+        val h = initial.copyOf()
+        val l = value.size.toULong() * 8UL

+        // padding
        val paddedValue = buildList {
            addAll(value)
            add(0x80U)
            while (size % 128 != 120) {
                add(0x00U)
            }
-            addAll(ml.toUByteArray())
+            addAll(l.toUByteArray())
        }

-        val chunks = paddedValue
+        // process
+        val blocks = paddedValue
            .chunked(128) { it.toUByteArray() }
-        for (chunk in chunks) {
+        for (block in blocks) {
            val w = buildList {
-                addAll(chunk.toULongArray())
+                addAll(block.toULongArray())
                for (i in 16..<80) {
                    val s0 = get(i - 15).rotateRight(1) xor get(i - 15).rotateRight(8) xor (get(i - 15) shr 7)
                    val s1 = get(i - 2).rotateRight(19) xor get(i - 2).rotateRight(61) xor (get(i - 2) shr 6)
                    add(get(i - 16) + s0 + get(i - 7) + s1)
                }
+            }.toULongArray()
+            process(h, w)
        }

-            var a = h0
-            var b = h1
-            var c = h2
-            var d = h3
-            var e = h4
-            var f = h5
-            var g = h6
-            var h = h7
+        return h.toUByteArray()
+    }
+
+    private fun process(
+        h: ULongArray,
+        w: ULongArray,
+    ) {
+        val v = h.copyOf()

        for (i in 0..<80) {
-                val s0 = a.rotateRight(28) xor a.rotateRight(34) xor a.rotateRight(39)
-                val s1 = e.rotateRight(14) xor e.rotateRight(18) xor e.rotateRight(41)
-                val ch = (e and f) xor (e.inv() and g)
-                val temp1 = h + s1 + ch + k[i] + w[i]
-                val maj = (a and b) xor (a and c) xor (b and c)
+            val s0 = v[0].rotateRight(28) xor v[0].rotateRight(34) xor v[0].rotateRight(39)
+            val s1 = v[4].rotateRight(14) xor v[4].rotateRight(18) xor v[4].rotateRight(41)
+            val ch = (v[4] and v[5]) xor (v[4].inv() and v[6])
+            val temp1 = v[7] + s1 + ch + this.c[i] + w[i]
+            val maj = (v[0] and v[1]) xor (v[0] and v[2]) xor (v[1] and v[2])
            val temp2 = s0 + maj

-                h = g
-                g = f
-                f = e
-                e = d + temp1
-                d = c
-                c = b
-                b = a
-                a = temp1 + temp2
+            v[7] = v[6]
+            v[6] = v[5]
+            v[5] = v[4]
+            v[4] = v[3] + temp1
+            v[3] = v[2]
+            v[2] = v[1]
+            v[1] = v[0]
+            v[0] = temp1 + temp2
        }

-            h0 += a
-            h1 += b
-            h2 += c
-            h3 += d
-            h4 += e
-            h5 += f
-            h6 += g
-            h7 += h
-        }
-
-        return ubyteArrayOf(
-            *h0.toUByteArray(),
-            *h1.toUByteArray(),
-            *h2.toUByteArray(),
-            *h3.toUByteArray(),
-            *h4.toUByteArray(),
-            *h5.toUByteArray(),
-            *h6.toUByteArray(),
-            *h7.toUByteArray(),
-        )
+        for (i in 0..7) {
+            h[i] += v[i]
+        }
    }
 }