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commonMain.io.github.andreypfau.curve25519.internal.Sha512Pure.kt Maven / Gradle / Ivy
@file:Suppress("OPT_IN_USAGE")
package io.github.andreypfau.curve25519.internal
// Copy from: https://github.com/ionspin/kotlin-multiplatform-crypto
class Sha512Pure {
val MAX_HASH_BYTES: Int = 32
companion object {
const val BLOCK_SIZE = 1024
const val BLOCK_SIZE_IN_BYTES = 128
const val CHUNK_SIZE = 80
const val ULONG_MASK = 0xFFFFFFFFFFFFFFFFUL
val MAX_HASH_BYTES: Int = 32
val k = arrayOf(
0x428a2f98d728ae22UL,
0x7137449123ef65cdUL,
0xb5c0fbcfec4d3b2fUL,
0xe9b5dba58189dbbcUL,
0x3956c25bf348b538UL,
0x59f111f1b605d019UL,
0x923f82a4af194f9bUL,
0xab1c5ed5da6d8118UL,
0xd807aa98a3030242UL,
0x12835b0145706fbeUL,
0x243185be4ee4b28cUL,
0x550c7dc3d5ffb4e2UL,
0x72be5d74f27b896fUL,
0x80deb1fe3b1696b1UL,
0x9bdc06a725c71235UL,
0xc19bf174cf692694UL,
0xe49b69c19ef14ad2UL,
0xefbe4786384f25e3UL,
0x0fc19dc68b8cd5b5UL,
0x240ca1cc77ac9c65UL,
0x2de92c6f592b0275UL,
0x4a7484aa6ea6e483UL,
0x5cb0a9dcbd41fbd4UL,
0x76f988da831153b5UL,
0x983e5152ee66dfabUL,
0xa831c66d2db43210UL,
0xb00327c898fb213fUL,
0xbf597fc7beef0ee4UL,
0xc6e00bf33da88fc2UL,
0xd5a79147930aa725UL,
0x06ca6351e003826fUL,
0x142929670a0e6e70UL,
0x27b70a8546d22ffcUL,
0x2e1b21385c26c926UL,
0x4d2c6dfc5ac42aedUL,
0x53380d139d95b3dfUL,
0x650a73548baf63deUL,
0x766a0abb3c77b2a8UL,
0x81c2c92e47edaee6UL,
0x92722c851482353bUL,
0xa2bfe8a14cf10364UL,
0xa81a664bbc423001UL,
0xc24b8b70d0f89791UL,
0xc76c51a30654be30UL,
0xd192e819d6ef5218UL,
0xd69906245565a910UL,
0xf40e35855771202aUL,
0x106aa07032bbd1b8UL,
0x19a4c116b8d2d0c8UL,
0x1e376c085141ab53UL,
0x2748774cdf8eeb99UL,
0x34b0bcb5e19b48a8UL,
0x391c0cb3c5c95a63UL,
0x4ed8aa4ae3418acbUL,
0x5b9cca4f7763e373UL,
0x682e6ff3d6b2b8a3UL,
0x748f82ee5defb2fcUL,
0x78a5636f43172f60UL,
0x84c87814a1f0ab72UL,
0x8cc702081a6439ecUL,
0x90befffa23631e28UL,
0xa4506cebde82bde9UL,
0xbef9a3f7b2c67915UL,
0xc67178f2e372532bUL,
0xca273eceea26619cUL,
0xd186b8c721c0c207UL,
0xeada7dd6cde0eb1eUL,
0xf57d4f7fee6ed178UL,
0x06f067aa72176fbaUL,
0x0a637dc5a2c898a6UL,
0x113f9804bef90daeUL,
0x1b710b35131c471bUL,
0x28db77f523047d84UL,
0x32caab7b40c72493UL,
0x3c9ebe0a15c9bebcUL,
0x431d67c49c100d4cUL,
0x4cc5d4becb3e42b6UL,
0x597f299cfc657e2aUL,
0x5fcb6fab3ad6faecUL,
0x6c44198c4a475817UL
)
val iv = arrayOf(
0x6a09e667f3bcc908UL,
0xbb67ae8584caa73bUL,
0x3c6ef372fe94f82bUL,
0xa54ff53a5f1d36f1UL,
0x510e527fade682d1UL,
0x9b05688c2b3e6c1fUL,
0x1f83d9abfb41bd6bUL,
0x5be0cd19137e2179UL
)
fun digest(inputMessage: UByteArray): UByteArray {
var h = iv.copyOf()
val expansionArray = createExpansionArray(inputMessage.size.toLong())
val chunks =
(inputMessage + expansionArray + (inputMessage.size * 8).toULong().toPadded128BitByteArray()).chunked(
BLOCK_SIZE_IN_BYTES
)
chunks.forEach { chunk ->
val w = expandChunk(chunk.toUByteArray())
mix(h, w)
}
val digest =
h[0].toPaddedByteArray() +
h[1].toPaddedByteArray() +
h[2].toPaddedByteArray() +
h[3].toPaddedByteArray() +
h[4].toPaddedByteArray() +
h[5].toPaddedByteArray() +
h[6].toPaddedByteArray() +
h[7].toPaddedByteArray()
return digest
}
private fun scheduleSigma0(value: ULong): ULong {
return value.rotateRight(1) xor value.rotateRight(8) xor (value shr 7)
}
private fun scheduleSigma1(value: ULong): ULong {
return value.rotateRight(19) xor value.rotateRight(61) xor (value shr 6)
}
private fun compressionSigma0(e: ULong): ULong {
return (e rotateRight 28) xor (e rotateRight 34) xor (e rotateRight 39)
}
private fun compressionSigma1(a: ULong): ULong {
return (a rotateRight 14) xor (a rotateRight 18) xor (a rotateRight 41)
}
private fun ch(x: ULong, y: ULong, z: ULong): ULong {
return ((x and y) xor ((x xor ULONG_MASK) and z))
}
private fun maj(x: ULong, y: ULong, z: ULong): ULong {
return ((x and y) xor (x and z) xor (y and z))
}
private fun expandChunk(chunk: UByteArray): Array {
val w = Array(CHUNK_SIZE) {
when (it) {
in 0 until 16 -> {
val collected = (chunk[(it * 8)].toULong() shl 56) +
(chunk[(it * 8) + 1].toULong() shl 48) +
(chunk[(it * 8) + 2].toULong() shl 40) +
(chunk[(it * 8) + 3].toULong() shl 32) +
(chunk[(it * 8) + 4].toULong() shl 24) +
(chunk[(it * 8) + 5].toULong() shl 16) +
(chunk[(it * 8) + 6].toULong() shl 8) +
(chunk[(it * 8) + 7].toULong())
collected
}
else -> 0UL
}
}
for (i in 16 until CHUNK_SIZE) {
val s0 = scheduleSigma0(w[i - 15])
val s1 = scheduleSigma1(w[i - 2])
w[i] = w[i - 16] + s0 + w[i - 7] + s1
}
return w
}
private fun mix(h: Array, w: Array): Array {
var paramA = h[0]
var paramB = h[1]
var paramC = h[2]
var paramD = h[3]
var paramE = h[4]
var paramF = h[5]
var paramG = h[6]
var paramH = h[7]
for (i in 0 until CHUNK_SIZE) {
val s1 = compressionSigma1(paramE)
val ch = ch(paramE, paramF, paramG)
val temp1 = paramH + s1 + ch + k[i] + w[i]
val s0 = compressionSigma0(paramA)
val maj = maj(paramA, paramB, paramC)
val temp2 = s0 + maj
paramH = paramG
paramG = paramF
paramF = paramE
paramE = paramD + temp1
paramD = paramC
paramC = paramB
paramB = paramA
paramA = temp1 + temp2
}
h[0] += paramA
h[1] += paramB
h[2] += paramC
h[3] += paramD
h[4] += paramE
h[5] += paramF
h[6] += paramG
h[7] += paramH
return h
}
fun createExpansionArray(originalSizeInBytes: Long): UByteArray {
val originalMessageSizeInBits = originalSizeInBytes * 8
val expandedRemainderOf1024 = (originalMessageSizeInBits + 129) % BLOCK_SIZE
val zeroAddAmount = when (expandedRemainderOf1024) {
0L -> 0
else -> ((BLOCK_SIZE - expandedRemainderOf1024) / 8).toInt()
}
val expansionArray = UByteArray(zeroAddAmount + 1) {
when (it) {
0 -> 0b10000000U
else -> 0U
}
}
return expansionArray
}
private fun ULong.toPaddedByteArray(): UByteArray {
val byteMask = 0xFFUL
//Ignore messages longer than 64 bits for now
return UByteArray(8) {
when (it) {
7 -> (this and byteMask).toUByte()
6 -> ((this shr 8) and byteMask).toUByte()
5 -> ((this shr 16) and byteMask).toUByte()
4 -> ((this shr 24) and byteMask).toUByte()
3 -> ((this shr 32) and byteMask).toUByte()
2 -> ((this shr 40) and byteMask).toUByte()
1 -> ((this shr 48) and byteMask).toUByte()
0 -> ((this shr 56) and byteMask).toUByte()
else -> 0U
}
}
}
private fun ULong.toPadded128BitByteArray(): UByteArray {
val byteMask = 0xFFUL
//Ignore messages longer than 64 bits for now
return UByteArray(16) {
when (it) {
15 -> (this and byteMask).toUByte()
14 -> ((this shr 8) and byteMask).toUByte()
13 -> ((this shr 16) and byteMask).toUByte()
12 -> ((this shr 24) and byteMask).toUByte()
11 -> ((this shr 32) and byteMask).toUByte()
10 -> ((this shr 40) and byteMask).toUByte()
9 -> ((this shr 48) and byteMask).toUByte()
8 -> ((this shr 54) and byteMask).toUByte()
else -> 0U
}
}
}
}
var h = iv.copyOf()
var counter = 0L
var bufferCounter = 0
var buffer = UByteArray(BLOCK_SIZE_IN_BYTES) { 0U }
var digested = false
fun update(data: UByteArray) {
if (data.isEmpty()) {
throw RuntimeException("Updating with empty array is not allowed. If you need empty hash, just call digest without updating")
}
if (digested) {
throw RuntimeException("This instance of updateable SHA256 was already finished once. You should use new instance")
}
when {
bufferCounter + data.size < BLOCK_SIZE_IN_BYTES -> appendToBuffer(data, bufferCounter)
bufferCounter + data.size >= BLOCK_SIZE_IN_BYTES -> {
val chunked = data.chunked(BLOCK_SIZE_IN_BYTES)
chunked.forEach { chunk ->
if (bufferCounter + chunk.size < BLOCK_SIZE_IN_BYTES) {
appendToBuffer(chunk.toUByteArray(), bufferCounter)
} else {
chunk.toUByteArray().copyInto(
destination = buffer,
destinationOffset = bufferCounter,
startIndex = 0,
endIndex = BLOCK_SIZE_IN_BYTES - bufferCounter
)
counter += BLOCK_SIZE_IN_BYTES
consumeBlock(buffer)
buffer = UByteArray(BLOCK_SIZE_IN_BYTES) {
when (it) {
in (0 until (chunk.size - (BLOCK_SIZE_IN_BYTES - bufferCounter))) -> {
chunk[it + (BLOCK_SIZE_IN_BYTES - bufferCounter)]
}
else -> {
0U
}
}
}
bufferCounter = chunk.size - (BLOCK_SIZE_IN_BYTES - bufferCounter)
}
}
}
}
}
private fun consumeBlock(block: UByteArray) {
val w = expandChunk(block)
mix(h, w).copyInto(h)
}
fun digest(): UByteArray {
val length = counter + bufferCounter
val expansionArray = createExpansionArray(length)
val finalBlock =
buffer.copyOfRange(0, bufferCounter) + expansionArray + (length * 8).toULong().toPadded128BitByteArray()
finalBlock.chunked(BLOCK_SIZE_IN_BYTES).forEach {
consumeBlock(it.toUByteArray())
}
val digest = h[0].toPaddedByteArray() +
h[1].toPaddedByteArray() +
h[2].toPaddedByteArray() +
h[3].toPaddedByteArray() +
h[4].toPaddedByteArray() +
h[5].toPaddedByteArray() +
h[6].toPaddedByteArray() +
h[7].toPaddedByteArray()
digested = true
return digest
}
private fun appendToBuffer(array: UByteArray, start: Int) {
array.copyInto(destination = buffer, destinationOffset = start, startIndex = 0, endIndex = array.size)
bufferCounter += array.size
}
}
private inline infix fun ULong.rotateRight(places: Int): ULong {
return (this shr places) xor (this shl (64 - places))
}
private inline fun UInt.toLittleEndianUByteArray(): UByteArray {
return UByteArray(4) {
((this shr (it * 8)) and 0xFFU).toUByte()
}
}
private inline operator fun UInt.plus(other: UByteArray): UByteArray {
return this.toLittleEndianUByteArray() + other
}
