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/*
* Copyright 2014-2022 JetBrains s.r.o and contributors. Use of this source code is governed by the Apache 2.0 license.
*/
package io.ktor.util
internal interface HashFunction {
fun update(input: ByteArray, offset: Int = 0, length: Int = input.size)
fun digest(): ByteArray
}
internal fun HashFunction.digest(input: ByteArray, offset: Int = 0, length: Int = input.size): ByteArray {
update(input, offset, length)
return digest()
}
private infix fun Int.leftRotate(bitCount: Int): Int {
return (this shl bitCount) or (this ushr (32 - bitCount))
}
internal class Sha1 : HashFunction {
private var messageLength = 0L
private val unprocessed = ByteArray(64)
private var unprocessedLimit = 0
private val words = IntArray(80)
private var h0 = 1732584193
private var h1 = -271733879
private var h2 = -1732584194
private var h3 = 271733878
private var h4 = -1009589776
override fun update(input: ByteArray, offset: Int, length: Int) {
messageLength += length
var pos = offset
val limit = pos + length
val unprocessed = this.unprocessed
val unprocessedLimit = this.unprocessedLimit
if (unprocessedLimit > 0) {
if (unprocessedLimit + length < 64) {
// Not enough bytes for a chunk.
input.copyInto(unprocessed, unprocessedLimit, pos, limit)
this.unprocessedLimit = unprocessedLimit + length
return
}
// Process a chunk combining leftover bytes and the input.
val consumeByteCount = 64 - unprocessedLimit
input.copyInto(unprocessed, unprocessedLimit, pos, pos + consumeByteCount)
processChunk(unprocessed, 0)
this.unprocessedLimit = 0
pos += consumeByteCount
}
while (pos < limit) {
val nextPos = pos + 64
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 currentPosition = pos
for (w in 0 until 16) {
words[w] =
((input[currentPosition++].toInt() and 0xff) shl 24) or
((input[currentPosition++].toInt() and 0xff) shl 16) or
((input[currentPosition++].toInt() and 0xff) shl 8) or
((input[currentPosition++].toInt() and 0xff))
}
for (w in 16 until 80) {
words[w] = (words[w - 3] xor words[w - 8] xor words[w - 14] xor words[w - 16]) leftRotate 1
}
var a = h0
var b = h1
var c = h2
var d = h3
var e = h4
for (i in 0 until 80) {
val a2 = when {
i < 20 -> {
val f = d xor (b and (c xor d))
val k = 1518500249
(a leftRotate 5) + f + e + k + words[i]
}
i < 40 -> {
val f = b xor c xor d
val k = 1859775393
(a leftRotate 5) + f + e + k + words[i]
}
i < 60 -> {
val f = (b and c) or (b and d) or (c and d)
val k = -1894007588
(a leftRotate 5) + f + e + k + words[i]
}
else -> {
val f = b xor c xor d
val k = -899497514
(a leftRotate 5) + f + e + k + words[i]
}
}
e = d
d = c
c = b leftRotate 30
b = a
a = a2
}
h0 += a
h1 += b
h2 += c
h3 += d
h4 += e
}
override fun digest(): ByteArray {
val unprocessed = this.unprocessed
var unprocessedLimit = this.unprocessedLimit
val messageLengthBits = messageLength * 8
unprocessed[unprocessedLimit++] = 0x80.toByte()
if (unprocessedLimit > 56) {
unprocessed.fill(0, unprocessedLimit, 64)
processChunk(unprocessed, 0)
unprocessed.fill(0, 0, unprocessedLimit)
} else {
unprocessed.fill(0, unprocessedLimit, 56)
}
unprocessed[56] = (messageLengthBits ushr 56).toByte()
unprocessed[57] = (messageLengthBits ushr 48).toByte()
unprocessed[58] = (messageLengthBits ushr 40).toByte()
unprocessed[59] = (messageLengthBits ushr 32).toByte()
unprocessed[60] = (messageLengthBits ushr 24).toByte()
unprocessed[61] = (messageLengthBits ushr 16).toByte()
unprocessed[62] = (messageLengthBits ushr 8).toByte()
unprocessed[63] = (messageLengthBits).toByte()
processChunk(unprocessed, 0)
val a = h0
val b = h1
val c = h2
val d = h3
val e = h4
reset()
return byteArrayOf(
(a shr 24).toByte(),
(a shr 16).toByte(),
(a shr 8).toByte(),
(a).toByte(),
(b shr 24).toByte(),
(b shr 16).toByte(),
(b shr 8).toByte(),
(b).toByte(),
(c shr 24).toByte(),
(c shr 16).toByte(),
(c shr 8).toByte(),
(c).toByte(),
(d shr 24).toByte(),
(d shr 16).toByte(),
(d shr 8).toByte(),
(d).toByte(),
(e shr 24).toByte(),
(e shr 16).toByte(),
(e shr 8).toByte(),
(e).toByte()
)
}
private fun reset() {
messageLength = 0L
unprocessed.fill(0)
unprocessedLimit = 0
words.fill(0)
h0 = 1732584193
h1 = -271733879
h2 = -1732584194
h3 = 271733878
h4 = -1009589776
}
}
