117 lines
3.4 KiB
Kotlin
117 lines
3.4 KiB
Kotlin
package com.infendro.hash.md
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import com.infendro.bytearray.ByteOrder.LITTLE_ENDIAN
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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 MD5 : HashFunction() {
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override val bytes: Int
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get() = 16
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override val block: Int
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get() = 64
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private val s = intArrayOf(
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7, 12, 17, 22,
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7, 12, 17, 22,
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7, 12, 17, 22,
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7, 12, 17, 22,
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5, 9, 14, 20,
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5, 9, 14, 20,
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5, 9, 14, 20,
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5, 9, 14, 20,
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4, 11, 16, 23,
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4, 11, 16, 23,
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4, 11, 16, 23,
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4, 11, 16, 23,
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6, 10, 15, 21,
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6, 10, 15, 21,
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6, 10, 15, 21,
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6, 10, 15, 21,
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)
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private val k = uintArrayOf(
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0xd76aa478U, 0xe8c7b756U, 0x242070dbU, 0xc1bdceeeU,
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0xf57c0fafU, 0x4787c62aU, 0xa8304613U, 0xfd469501U,
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0x698098d8U, 0x8b44f7afU, 0xffff5bb1U, 0x895cd7beU,
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0x6b901122U, 0xfd987193U, 0xa679438eU, 0x49b40821U,
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0xf61e2562U, 0xc040b340U, 0x265e5a51U, 0xe9b6c7aaU,
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0xd62f105dU, 0x02441453U, 0xd8a1e681U, 0xe7d3fbc8U,
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0x21e1cde6U, 0xc33707d6U, 0xf4d50d87U, 0x455a14edU,
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0xa9e3e905U, 0xfcefa3f8U, 0x676f02d9U, 0x8d2a4c8aU,
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0xfffa3942U, 0x8771f681U, 0x6d9d6122U, 0xfde5380cU,
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0xa4beea44U, 0x4bdecfa9U, 0xf6bb4b60U, 0xbebfbc70U,
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0x289b7ec6U, 0xeaa127faU, 0xd4ef3085U, 0x04881d05U,
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0xd9d4d039U, 0xe6db99e5U, 0x1fa27cf8U, 0xc4ac5665U,
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0xf4292244U, 0x432aff97U, 0xab9423a7U, 0xfc93a039U,
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0x655b59c3U, 0x8f0ccc92U, 0xffeff47dU, 0x85845dd1U,
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0x6fa87e4fU, 0xfe2ce6e0U, 0xa3014314U, 0x4e0811a1U,
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0xf7537e82U, 0xbd3af235U, 0x2ad7d2bbU, 0xeb86d391U,
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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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var a0 = 0x67452301U
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var b0 = 0xefcdab89U
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var c0 = 0x98badcfeU
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var d0 = 0x10325476U
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val ml = value.size.toULong() * 8UL
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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(ml.toUByteArray(LITTLE_ENDIAN))
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}
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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(LITTLE_ENDIAN))
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}
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var a = a0
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var b = b0
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var c = c0
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var d = d0
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for (i in 0..<64) {
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val f = when (i) {
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in 0..15 -> (b and c) or (b.inv() and d)
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in 16..31 -> (d and b) or (d.inv() and c)
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in 32..47 -> b xor c xor d
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else -> c xor (b or d.inv())
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}
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val g = when (i) {
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in 0..15 -> i
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in 16..31 -> (5 * i + 1) % 16
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in 32..47 -> (3 * i + 5) % 16
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else -> (7 * i) % 16
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}
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val temp = a
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a = d
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d = c
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c = b
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b += (temp + f + k[i] + w[g]).rotateLeft(s[i])
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}
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a0 += a
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b0 += b
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c0 += c
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d0 += d
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}
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return ubyteArrayOf(
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*a0.toUByteArray(LITTLE_ENDIAN),
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*b0.toUByteArray(LITTLE_ENDIAN),
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*c0.toUByteArray(LITTLE_ENDIAN),
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*d0.toUByteArray(LITTLE_ENDIAN),
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)
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}
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}
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