Infendro/hash.kt
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implement optimizations

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Infendro
2026-01-15 22:06:28 +01:00
parent ab036f4f9f
commit d40df04e2e
26 changed files with 463 additions and 855 deletions
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92
src/commonMain/kotlin/com/infendro/hash/md/MD5.kt
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@@ -1,9 +1,11 @@
package com.infendro.hash.md
import com.infendro.bytearray.ByteOrder.LITTLE_ENDIAN
import com.infendro.bytearray.toUByteArray
import com.infendro.bytearray.toUIntArray
import com.infendro.bytes.ByteOrder.LITTLE_ENDIAN
import com.infendro.bytes.bytearray.copyInto
import com.infendro.bytes.intarray.copyInto
import com.infendro.bytes.ulong.copyInto
import com.infendro.hash.HashFunction
import com.infendro.hash.util.ceilPow2
object MD5 : HashFunction {
override val bytes: Int
@@ -15,18 +17,7 @@ object MD5 : HashFunction {
private val initial = uintArrayOf(
0x67452301U, 0xefcdab89U,
0x98badcfeU, 0x10325476U,
)
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,
)
).asIntArray()
private val c = uintArrayOf(
0xd76aa478U, 0xe8c7b756U, 0x242070dbU, 0xc1bdceeeU,
@@ -45,54 +36,57 @@ object MD5 : HashFunction {
0x655b59c3U, 0x8f0ccc92U, 0xffeff47dU, 0x85845dd1U,
0x6fa87e4fU, 0xfe2ce6e0U, 0xa3014314U, 0x4e0811a1U,
0xf7537e82U, 0xbd3af235U, 0x2ad7d2bbU, 0xeb86d391U,
).asIntArray()
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,
)
override fun hash(
value: UByteArray,
): UByteArray {
override fun hashInto(value: ByteArray, destination: ByteArray) {
val input = pad(value)
val h = initial.copyOf()
val w = IntArray(16)
val v = IntArray(4)
val blocks = pad(value)
.chunked(64) { it.toUByteArray() }
for (block in blocks) {
process(h, block)
for (i in input.indices step block) {
process(h, input, i, w, v)
}
return h.toUByteArray(LITTLE_ENDIAN)
h.copyInto(destination, order = LITTLE_ENDIAN)
}
private fun pad(
value: UByteArray,
): UByteArray {
val l = value.size.toULong() * 8UL
return buildList {
addAll(value)
add(0x80U)
while (size % 64 != 56) {
add(0x00U)
}
addAll(l.toUByteArray(LITTLE_ENDIAN))
}.toUByteArray()
private fun pad(value: ByteArray): ByteArray {
val length = value.size.toULong() * 8UL
val size = ceilPow2(value.size + 9, block)
val result = ByteArray(size)
value.copyInto(result)
result[value.size] = 0x80U.toByte()
length.copyInto(result, result.size - 8, order = LITTLE_ENDIAN)
return result
}
private fun process(
h: UIntArray,
block: UByteArray,
) {
val w = block.toUIntArray(LITTLE_ENDIAN)
val v = h.copyOf()
private fun process(h: IntArray, value: ByteArray, offset: Int, w: IntArray, v: IntArray) {
value.copyInto(w, startIndex = offset, endIndex = offset + block, order = LITTLE_ENDIAN)
h.copyInto(v)
repeat(64) { i ->
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]
in 0..<16 -> (v[1] and v[2]) or (v[1].inv() and v[3])
in 16..<32 -> (v[3] and v[1]) or (v[3].inv() and v[2])
in 32..<48 -> 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
in 16..31 -> (5 * i + 1) % 16
in 32..47 -> (3 * i + 5) % 16
in 0..<16 -> i
in 16..<32 -> (5 * i + 1) % 16
in 32..<48 -> (3 * i + 5) % 16
else -> (7 * i) % 16
}
f += v[0] + c[i] + w[g]
@@ -102,7 +96,7 @@ object MD5 : HashFunction {
v[1] += f.rotateLeft(shifts[i])
}
for (i in 0..3) {
for (i in 0..<4) {
h[i] += v[i]
}
}