99 lines
3.3 KiB
Kotlin
99 lines
3.3 KiB
Kotlin
package com.infendro.hash.blake2
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import com.infendro.bytes.ByteOrder.LITTLE_ENDIAN
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import com.infendro.bytes.bytearray.toIntArray
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import com.infendro.bytes.intarray.toByteArray
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import com.infendro.hash.HashFunction
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import com.infendro.hash.util.align
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class Blake2s(
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override val bytes: Int,
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) : HashFunction {
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init {
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require(bytes in 1..32)
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}
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override val block: Int
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get() = 64
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private val initial = intArrayOf(
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+0x6a09e667, -0x4498517b,
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+0x3c6ef372, -0x5ab00ac6,
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+0x510e527f, -0x64fa9774,
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+0x1f83d9ab, +0x5be0cd19,
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)
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private val sigma = arrayOf(
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intArrayOf(0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15),
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intArrayOf(14, 10, 4, 8, 9, 15, 13, 6, 1, 12, 0, 2, 11, 7, 5, 3),
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intArrayOf(11, 8, 12, 0, 5, 2, 15, 13, 10, 14, 3, 6, 7, 1, 9, 4),
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intArrayOf(7, 9, 3, 1, 13, 12, 11, 14, 2, 6, 5, 10, 4, 0, 15, 8),
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intArrayOf(9, 0, 5, 7, 2, 4, 10, 15, 14, 1, 11, 12, 6, 8, 3, 13),
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intArrayOf(2, 12, 6, 10, 0, 11, 8, 3, 4, 13, 7, 5, 15, 14, 1, 9),
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intArrayOf(12, 5, 1, 15, 14, 13, 4, 10, 0, 7, 6, 3, 9, 2, 8, 11),
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intArrayOf(13, 11, 7, 14, 12, 1, 3, 9, 5, 0, 15, 4, 8, 6, 2, 10),
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intArrayOf(6, 15, 14, 9, 11, 3, 0, 8, 12, 2, 13, 7, 1, 4, 10, 5),
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intArrayOf(10, 2, 8, 4, 7, 6, 1, 5, 15, 11, 9, 14, 3, 12, 13, 0),
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)
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override fun hashInto(value: ByteArray, destination: ByteArray, destinationOffset: Int) {
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val length = value.size.toULong()
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val input = pad(value)
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val h = initial.copyOf()
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h[0] = h[0] xor (0x01010000 or bytes)
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var t = 0U
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for (i in input.indices step block) {
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t += minOf(length - t, 64UL).toUInt()
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val block = input.sliceArray(i..<(i + block))
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compress(h, block, t, t < 1024UL)
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}
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h.toByteArray(LITTLE_ENDIAN).copyInto(destination, destinationOffset, endIndex = bytes)
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}
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private fun pad(value: ByteArray): ByteArray {
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val size = maxOf(value.size.align(block), block)
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return ByteArray(size).also {
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value.copyInto(it)
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}
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}
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private fun compress(h: IntArray, block: ByteArray, t: UInt, last: Boolean) {
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val m = block.toIntArray()
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val v = IntArray(16)
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for (i in 0..<8) v[i] = h[i]
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for (i in 0..<8) v[i + 8] = initial[i]
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v[12] = v[12] xor t.toInt()
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if (last) v[14] = v[14].inv()
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repeat(10) { r ->
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val s = sigma[r]
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mix(v, 0, 4, 8, 12, m[s[0]], m[s[1]])
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mix(v, 1, 5, 9, 13, m[s[2]], m[s[3]])
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mix(v, 2, 6, 10, 14, m[s[4]], m[s[5]])
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mix(v, 3, 7, 11, 15, m[s[6]], m[s[7]])
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mix(v, 0, 5, 10, 15, m[s[8]], m[s[9]])
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mix(v, 1, 6, 11, 12, m[s[10]], m[s[11]])
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mix(v, 2, 7, 8, 13, m[s[12]], m[s[13]])
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mix(v, 3, 4, 9, 14, m[s[14]], m[s[15]])
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}
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for (i in 0..<8) {
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h[i] = h[i] xor v[i] xor v[i + 8]
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}
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}
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private fun mix(v: IntArray, a: Int, b: Int, c: Int, d: Int, x: Int, y: Int) {
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v[a] += v[b] + x
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v[d] = (v[d] xor v[a]).rotateRight(16)
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v[c] += v[d]
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v[b] = (v[b] xor v[c]).rotateRight(12)
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v[a] += v[b] + y
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v[d] = (v[d] xor v[a]).rotateRight(8)
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v[c] += v[d]
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v[b] = (v[b] xor v[c]).rotateRight(7)
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}
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}
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