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/*
* Copyright (C) 2020 Square, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package okio.internal
import okio.rightRotate
internal class Sha512 : HashFunction {
private var messageLength = 0L
private val unprocessed = ByteArray(128)
private var unprocessedLimit = 0
private val words = LongArray(80)
private var h0 = 7640891576956012808L
private var h1 = -4942790177534073029L
private var h2 = 4354685564936845355L
private var h3 = -6534734903238641935L
private var h4 = 5840696475078001361L
private var h5 = -7276294671716946913L
private var h6 = 2270897969802886507L
private var h7 = 6620516959819538809L
override fun update(
input: ByteArray,
offset: Int,
byteCount: Int,
) {
messageLength += byteCount
var pos = offset
val limit = pos + byteCount
val unprocessed = this.unprocessed
val unprocessedLimit = this.unprocessedLimit
if (unprocessedLimit > 0) {
if (unprocessedLimit + byteCount < 128) {
// Not enough bytes for a chunk.
input.copyInto(unprocessed, unprocessedLimit, pos, limit)
this.unprocessedLimit = unprocessedLimit + byteCount
return
}
// Process a chunk combining leftover bytes and the input.
val consumeByteCount = 128 - unprocessedLimit
input.copyInto(unprocessed, unprocessedLimit, pos, pos + consumeByteCount)
processChunk(unprocessed, 0)
this.unprocessedLimit = 0
pos += consumeByteCount
}
while (pos < limit) {
val nextPos = pos + 128
if (nextPos > limit) {
// Not enough bytes for a chunk.
input.copyInto(unprocessed, 0, pos, limit)
this.unprocessedLimit = limit - pos
return
}
// Process a chunk.
processChunk(input, pos)
pos = nextPos
}
}
private fun processChunk(input: ByteArray, pos: Int) {
val words = this.words
var pos = pos
for (w in 0 until 16) {
words[w] = ((input[pos++].toLong() and 0xff) shl 56) or
((input[pos++].toLong() and 0xff) shl 48) or
((input[pos++].toLong() and 0xff) shl 40) or
((input[pos++].toLong() and 0xff) shl 32) or
((input[pos++].toLong() and 0xff) shl 24) or
((input[pos++].toLong() and 0xff) shl 16) or
((input[pos++].toLong() and 0xff) shl 8) or
((input[pos++].toLong() and 0xff))
}
for (i in 16 until 80) {
val w15 = words[i - 15]
val s0 = (w15 rightRotate 1) xor (w15 rightRotate 8) xor (w15 ushr 7)
val w2 = words[i - 2]
val s1 = (w2 rightRotate 19) xor (w2 rightRotate 61) xor (w2 ushr 6)
val w16 = words[i - 16]
val w7 = words[i - 7]
words[i] = w16 + s0 + w7 + s1
}
hash(words)
}
private fun hash(words: LongArray) {
val localK = k
var a = h0
var b = h1
var c = h2
var d = h3
var e = h4
var f = h5
var g = h6
var h = h7
for (i in 0 until 80) {
val s0 = (a rightRotate 28) xor (a rightRotate 34) xor (a rightRotate 39)
val s1 = (e rightRotate 14) xor (e rightRotate 18) xor (e rightRotate 41)
val ch = (e and f) xor (e.inv() and g)
val maj = (a and b) xor (a and c) xor (b and c)
val t1 = h + s1 + ch + localK[i] + words[i]
val t2 = s0 + maj
h = g
g = f
f = e
e = d + t1
d = c
c = b
b = a
a = t1 + t2
}
h0 += a
h1 += b
h2 += c
h3 += d
h4 += e
h5 += f
h6 += g
h7 += h
}
/* ktlint-disable */
override fun digest(): ByteArray {
val unprocessed = this.unprocessed
var unprocessedLimit = this.unprocessedLimit
val messageLengthBits = messageLength * 8
unprocessed[unprocessedLimit++] = 0x80.toByte()
if (unprocessedLimit > 112) {
unprocessed.fill(0, unprocessedLimit, 128)
processChunk(unprocessed, 0)
unprocessed.fill(0, 0, unprocessedLimit)
} else {
unprocessed.fill(0, unprocessedLimit, 120)
}
unprocessed[120] = (messageLengthBits ushr 56).toByte()
unprocessed[121] = (messageLengthBits ushr 48).toByte()
unprocessed[122] = (messageLengthBits ushr 40).toByte()
unprocessed[123] = (messageLengthBits ushr 32).toByte()
unprocessed[124] = (messageLengthBits ushr 24).toByte()
unprocessed[125] = (messageLengthBits ushr 16).toByte()
unprocessed[126] = (messageLengthBits ushr 8).toByte()
unprocessed[127] = (messageLengthBits ).toByte()
processChunk(unprocessed, 0)
val a = h0
val b = h1
val c = h2
val d = h3
val e = h4
val f = h5
val g = h6
val h = h7
reset()
return byteArrayOf(
(a shr 56).toByte(),
(a shr 48).toByte(),
(a shr 40).toByte(),
(a shr 32).toByte(),
(a shr 24).toByte(),
(a shr 16).toByte(),
(a shr 8).toByte(),
(a ).toByte(),
(b shr 56).toByte(),
(b shr 48).toByte(),
(b shr 40).toByte(),
(b shr 32).toByte(),
(b shr 24).toByte(),
(b shr 16).toByte(),
(b shr 8).toByte(),
(b ).toByte(),
(c shr 56).toByte(),
(c shr 48).toByte(),
(c shr 40).toByte(),
(c shr 32).toByte(),
(c shr 24).toByte(),
(c shr 16).toByte(),
(c shr 8).toByte(),
(c ).toByte(),
(d shr 56).toByte(),
(d shr 48).toByte(),
(d shr 40).toByte(),
(d shr 32).toByte(),
(d shr 24).toByte(),
(d shr 16).toByte(),
(d shr 8).toByte(),
(d ).toByte(),
(e shr 56).toByte(),
(e shr 48).toByte(),
(e shr 40).toByte(),
(e shr 32).toByte(),
(e shr 24).toByte(),
(e shr 16).toByte(),
(e shr 8).toByte(),
(e ).toByte(),
(f shr 56).toByte(),
(f shr 48).toByte(),
(f shr 40).toByte(),
(f shr 32).toByte(),
(f shr 24).toByte(),
(f shr 16).toByte(),
(f shr 8).toByte(),
(f ).toByte(),
(g shr 56).toByte(),
(g shr 48).toByte(),
(g shr 40).toByte(),
(g shr 32).toByte(),
(g shr 24).toByte(),
(g shr 16).toByte(),
(g shr 8).toByte(),
(g ).toByte(),
(h shr 56).toByte(),
(h shr 48).toByte(),
(h shr 40).toByte(),
(h shr 32).toByte(),
(h shr 24).toByte(),
(h shr 16).toByte(),
(h shr 8).toByte(),
(h ).toByte()
)
}
/* ktlint-enable */
private fun reset() {
messageLength = 0L
unprocessed.fill(0)
unprocessedLimit = 0
words.fill(0)
h0 = 7640891576956012808L
h1 = -4942790177534073029L
h2 = 4354685564936845355L
h3 = -6534734903238641935L
h4 = 5840696475078001361L
h5 = -7276294671716946913L
h6 = 2270897969802886507L
h7 = 6620516959819538809L
}
companion object {
private val k = longArrayOf(
4794697086780616226L, 8158064640168781261L, -5349999486874862801L, -1606136188198331460L,
4131703408338449720L, 6480981068601479193L, -7908458776815382629L, -6116909921290321640L,
-2880145864133508542L, 1334009975649890238L, 2608012711638119052L, 6128411473006802146L,
8268148722764581231L, -9160688886553864527L, -7215885187991268811L, -4495734319001033068L,
-1973867731355612462L, -1171420211273849373L, 1135362057144423861L, 2597628984639134821L,
3308224258029322869L, 5365058923640841347L, 6679025012923562964L, 8573033837759648693L,
-7476448914759557205L, -6327057829258317296L, -5763719355590565569L, -4658551843659510044L,
-4116276920077217854L, -3051310485924567259L, 489312712824947311L, 1452737877330783856L,
2861767655752347644L, 3322285676063803686L, 5560940570517711597L, 5996557281743188959L,
7280758554555802590L, 8532644243296465576L, -9096487096722542874L, -7894198246740708037L,
-6719396339535248540L, -6333637450476146687L, -4446306890439682159L, -4076793802049405392L,
-3345356375505022440L, -2983346525034927856L, -860691631967231958L, 1182934255886127544L,
1847814050463011016L, 2177327727835720531L, 2830643537854262169L, 3796741975233480872L,
4115178125766777443L, 5681478168544905931L, 6601373596472566643L, 7507060721942968483L,
8399075790359081724L, 8693463985226723168L, -8878714635349349518L, -8302665154208450068L,
-8016688836872298968L, -6606660893046293015L, -4685533653050689259L, -4147400797238176981L,
-3880063495543823972L, -3348786107499101689L, -1523767162380948706L, -757361751448694408L,
500013540394364858L, 748580250866718886L, 1242879168328830382L, 1977374033974150939L,
2944078676154940804L, 3659926193048069267L, 4368137639120453308L, 4836135668995329356L,
5532061633213252278L, 6448918945643986474L, 6902733635092675308L, 7801388544844847127L,
)
}
}
