95 lines
3.2 KiB
Kotlin
95 lines
3.2 KiB
Kotlin
package com.infendro.hash.sha2
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import com.infendro.bytearray.toUByteArray
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import com.infendro.bytearray.toUIntArray
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import com.infendro.hash.HashFunction
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object `SHA-256` : HashFunction() {
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override val bytes: Int
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get() = 32
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override val block: Int
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get() = 64
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private val initial = uintArrayOf(
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0x6a09e667U, 0xbb67ae85U,
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0x3c6ef372U, 0xa54ff53aU,
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0x510e527fU, 0x9b05688cU,
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0x1f83d9abU, 0x5be0cd19U,
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)
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private val c = uintArrayOf(
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0x428a2f98U, 0x71374491U, 0xb5c0fbcfU, 0xe9b5dba5U, 0x3956c25bU, 0x59f111f1U, 0x923f82a4U, 0xab1c5ed5U,
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0xd807aa98U, 0x12835b01U, 0x243185beU, 0x550c7dc3U, 0x72be5d74U, 0x80deb1feU, 0x9bdc06a7U, 0xc19bf174U,
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0xe49b69c1U, 0xefbe4786U, 0x0fc19dc6U, 0x240ca1ccU, 0x2de92c6fU, 0x4a7484aaU, 0x5cb0a9dcU, 0x76f988daU,
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0x983e5152U, 0xa831c66dU, 0xb00327c8U, 0xbf597fc7U, 0xc6e00bf3U, 0xd5a79147U, 0x06ca6351U, 0x14292967U,
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0x27b70a85U, 0x2e1b2138U, 0x4d2c6dfcU, 0x53380d13U, 0x650a7354U, 0x766a0abbU, 0x81c2c92eU, 0x92722c85U,
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0xa2bfe8a1U, 0xa81a664bU, 0xc24b8b70U, 0xc76c51a3U, 0xd192e819U, 0xd6990624U, 0xf40e3585U, 0x106aa070U,
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0x19a4c116U, 0x1e376c08U, 0x2748774cU, 0x34b0bcb5U, 0x391c0cb3U, 0x4ed8aa4aU, 0x5b9cca4fU, 0x682e6ff3U,
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0x748f82eeU, 0x78a5636fU, 0x84c87814U, 0x8cc70208U, 0x90befffaU, 0xa4506cebU, 0xbef9a3f7U, 0xc67178f2U,
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)
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override fun hash(
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value: UByteArray,
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): UByteArray {
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val h = initial.copyOf()
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val l = value.size.toULong() * 8UL
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// padding
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val paddedValue = buildList {
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addAll(value)
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add(0x80U)
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while (size % 64 != 56) {
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add(0x00U)
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}
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addAll(l.toUByteArray())
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}
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// process
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val chunks = paddedValue
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.chunked(64) { it.toUByteArray() }
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for (chunk in chunks) {
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val w = buildList {
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addAll(chunk.toUIntArray())
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for (i in 16..<64) {
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val s0 = get(i - 15).rotateRight(7) xor get(i - 15).rotateRight(18) xor (get(i - 15) shr 3)
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val s1 = get(i - 2).rotateRight(17) xor get(i - 2).rotateRight(19) xor (get(i - 2) shr 10)
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add(get(i - 16) + s0 + get(i - 7) + s1)
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}
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}.toUIntArray()
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process(h, w)
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}
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return h.toUByteArray()
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}
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private fun process(
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h: UIntArray,
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w: UIntArray,
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) {
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val v = h.copyOf()
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for (i in 0..<64) {
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val s0 = v[0].rotateRight(2) xor v[0].rotateRight(13) xor v[0].rotateRight(22)
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val s1 = v[4].rotateRight(6) xor v[4].rotateRight(11) xor v[4].rotateRight(25)
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val ch = (v[4] and v[5]) xor (v[4].inv() and v[6])
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val temp1 = v[7] + s1 + ch + this.c[i] + w[i]
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val maj = (v[0] and v[1]) xor (v[0] and v[2]) xor (v[1] and v[2])
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val temp2 = s0 + maj
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v[7] = v[6]
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v[6] = v[5]
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v[5] = v[4]
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v[4] = v[3] + temp1
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v[3] = v[2]
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v[2] = v[1]
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v[1] = v[0]
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v[0] = temp1 + temp2
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}
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for (i in 0..7) {
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h[i] += v[i]
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}
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}
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}
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