MD5.swift
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/*
* A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
* Digest Algorithm, as defined in RFC 1321.
* Version 2.2 Copyright (C) Paul Johnston 1999 - 2009
* Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
* Distributed under the BSD License
* See http://pajhome.org.uk/crypt/md5 for more info.
*/
/**
* SwiftHash
* Copyright (c) Khoa Pham 2017
* Licensed under the MIT license. See LICENSE file.
*/
import Foundation
// MARK: - Public
public func MD5(_ input: String) -> String {
return hex_md5(input)
}
// MARK: - Functions
func hex_md5(_ input: String) -> String {
return rstr2hex(rstr_md5(str2rstr_utf8(input)))
}
func str2rstr_utf8(_ input: String) -> [CUnsignedChar] {
return Array(input.utf8)
}
func rstr2tr(_ input: [CUnsignedChar]) -> String {
var output: String = ""
input.forEach {
output.append(String(UnicodeScalar($0)))
}
return output
}
/*
* Convert a raw string to a hex string
*/
func rstr2hex(_ input: [CUnsignedChar]) -> String {
let hexTab: [Character] = ["0", "1", "2", "3", "4", "5", "6", "7", "8", "9", "A", "B", "C", "D", "E", "F"]
var output: [Character] = []
for i in 0..<input.count {
let x = input[i]
let value1 = hexTab[Int((x >> 4) & 0x0F)]
let value2 = hexTab[Int(Int32(x) & 0x0F)]
output.append(value1)
output.append(value2)
}
return String(output)
}
/*
* Convert a raw string to an array of little-endian words
* Characters >255 have their high-byte silently ignored.
*/
func rstr2binl(_ input: [CUnsignedChar]) -> [Int32] {
var output: [Int: Int32] = [:]
for i in stride(from: 0, to: input.count * 8, by: 8) {
let value: Int32 = (Int32(input[i/8]) & 0xFF) << (Int32(i) % 32)
output[i >> 5] = unwrap(output[i >> 5]) | value
}
return dictionary2array(output)
}
/*
* Convert an array of little-endian words to a string
*/
func binl2rstr(_ input: [Int32]) -> [CUnsignedChar] {
var output: [CUnsignedChar] = []
for i in stride(from: 0, to: input.count * 32, by: 8) {
// [i>>5] >>>
let value: Int32 = zeroFillRightShift(input[i>>5], Int32(i % 32)) & 0xFF
output.append(CUnsignedChar(value))
}
return output
}
/*
* Calculate the MD5 of a raw string
*/
func rstr_md5(_ input: [CUnsignedChar]) -> [CUnsignedChar] {
return binl2rstr(binl_md5(rstr2binl(input), input.count * 8))
}
/*
* Add integers, wrapping at 2^32. This uses 16-bit operations internally
* to work around bugs in some JS interpreters.
*/
func safe_add(_ x: Int32, _ y: Int32) -> Int32 {
let lsw = (x & 0xFFFF) + (y & 0xFFFF)
let msw = (x >> 16) + (y >> 16) + (lsw >> 16)
return (msw << 16) | (lsw & 0xFFFF)
}
/*
* Bitwise rotate a 32-bit number to the left.
*/
func bit_rol(_ num: Int32, _ cnt: Int32) -> Int32 {
// num >>>
return (num << cnt) | zeroFillRightShift(num, (32 - cnt))
}
/*
* These funcs implement the four basic operations the algorithm uses.
*/
func md5_cmn(_ q: Int32, _ a: Int32, _ b: Int32, _ x: Int32, _ s: Int32, _ t: Int32) -> Int32 {
return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s), b)
}
func md5_ff(_ a: Int32, _ b: Int32, _ c: Int32, _ d: Int32, _ x: Int32, _ s: Int32, _ t: Int32) -> Int32 {
return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t)
}
func md5_gg(_ a: Int32, _ b: Int32, _ c: Int32, _ d: Int32, _ x: Int32, _ s: Int32, _ t: Int32) -> Int32 {
return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t)
}
func md5_hh(_ a: Int32, _ b: Int32, _ c: Int32, _ d: Int32, _ x: Int32, _ s: Int32, _ t: Int32) -> Int32 {
return md5_cmn(b ^ c ^ d, a, b, x, s, t)
}
func md5_ii(_ a: Int32, _ b: Int32, _ c: Int32, _ d: Int32, _ x: Int32, _ s: Int32, _ t: Int32) -> Int32 {
return md5_cmn(c ^ (b | (~d)), a, b, x, s, t)
}
/*
* Calculate the MD5 of an array of little-endian words, and a bit length.
*/
func binl_md5(_ input: [Int32], _ len: Int) -> [Int32] {
/* append padding */
var x: [Int: Int32] = [:]
for (index, value) in input.enumerated() {
x[index] = value
}
let value: Int32 = 0x80 << Int32((len) % 32)
x[len >> 5] = unwrap(x[len >> 5]) | value
// >>> 9
let index = (((len + 64) >> 9) << 4) + 14
x[index] = unwrap(x[index]) | Int32(len)
var a: Int32 = 1732584193
var b: Int32 = -271733879
var c: Int32 = -1732584194
var d: Int32 = 271733878
for i in stride(from: 0, to: length(x), by: 16) {
let olda: Int32 = a
let oldb: Int32 = b
let oldc: Int32 = c
let oldd: Int32 = d
a = md5_ff(a, b, c, d, unwrap(x[i + 0]), 7 , -680876936)
d = md5_ff(d, a, b, c, unwrap(x[i + 1]), 12, -389564586)
c = md5_ff(c, d, a, b, unwrap(x[i + 2]), 17, 606105819)
b = md5_ff(b, c, d, a, unwrap(x[i + 3]), 22, -1044525330)
a = md5_ff(a, b, c, d, unwrap(x[i + 4]), 7 , -176418897)
d = md5_ff(d, a, b, c, unwrap(x[i + 5]), 12, 1200080426)
c = md5_ff(c, d, a, b, unwrap(x[i + 6]), 17, -1473231341)
b = md5_ff(b, c, d, a, unwrap(x[i + 7]), 22, -45705983)
a = md5_ff(a, b, c, d, unwrap(x[i + 8]), 7 , 1770035416)
d = md5_ff(d, a, b, c, unwrap(x[i + 9]), 12, -1958414417)
c = md5_ff(c, d, a, b, unwrap(x[i + 10]), 17, -42063)
b = md5_ff(b, c, d, a, unwrap(x[i + 11]), 22, -1990404162)
a = md5_ff(a, b, c, d, unwrap(x[i + 12]), 7 , 1804603682)
d = md5_ff(d, a, b, c, unwrap(x[i + 13]), 12, -40341101)
c = md5_ff(c, d, a, b, unwrap(x[i + 14]), 17, -1502002290)
b = md5_ff(b, c, d, a, unwrap(x[i + 15]), 22, 1236535329)
a = md5_gg(a, b, c, d, unwrap(x[i + 1]), 5 , -165796510)
d = md5_gg(d, a, b, c, unwrap(x[i + 6]), 9 , -1069501632)
c = md5_gg(c, d, a, b, unwrap(x[i + 11]), 14, 643717713)
b = md5_gg(b, c, d, a, unwrap(x[i + 0]), 20, -373897302)
a = md5_gg(a, b, c, d, unwrap(x[i + 5]), 5 , -701558691)
d = md5_gg(d, a, b, c, unwrap(x[i + 10]), 9 , 38016083)
c = md5_gg(c, d, a, b, unwrap(x[i + 15]), 14, -660478335)
b = md5_gg(b, c, d, a, unwrap(x[i + 4]), 20, -405537848)
a = md5_gg(a, b, c, d, unwrap(x[i + 9]), 5 , 568446438)
d = md5_gg(d, a, b, c, unwrap(x[i + 14]), 9 , -1019803690)
c = md5_gg(c, d, a, b, unwrap(x[i + 3]), 14, -187363961)
b = md5_gg(b, c, d, a, unwrap(x[i + 8]), 20, 1163531501)
a = md5_gg(a, b, c, d, unwrap(x[i + 13]), 5 , -1444681467)
d = md5_gg(d, a, b, c, unwrap(x[i + 2]), 9 , -51403784)
c = md5_gg(c, d, a, b, unwrap(x[i + 7]), 14, 1735328473)
b = md5_gg(b, c, d, a, unwrap(x[i + 12]), 20, -1926607734)
a = md5_hh(a, b, c, d, unwrap(x[i + 5]), 4 , -378558)
d = md5_hh(d, a, b, c, unwrap(x[i + 8]), 11, -2022574463)
c = md5_hh(c, d, a, b, unwrap(x[i + 11]), 16, 1839030562)
b = md5_hh(b, c, d, a, unwrap(x[i + 14]), 23, -35309556)
a = md5_hh(a, b, c, d, unwrap(x[i + 1]), 4 , -1530992060)
d = md5_hh(d, a, b, c, unwrap(x[i + 4]), 11, 1272893353)
c = md5_hh(c, d, a, b, unwrap(x[i + 7]), 16, -155497632)
b = md5_hh(b, c, d, a, unwrap(x[i + 10]), 23, -1094730640)
a = md5_hh(a, b, c, d, unwrap(x[i + 13]), 4 , 681279174)
d = md5_hh(d, a, b, c, unwrap(x[i + 0]), 11, -358537222)
c = md5_hh(c, d, a, b, unwrap(x[i + 3]), 16, -722521979)
b = md5_hh(b, c, d, a, unwrap(x[i + 6]), 23, 76029189)
a = md5_hh(a, b, c, d, unwrap(x[i + 9]), 4 , -640364487)
d = md5_hh(d, a, b, c, unwrap(x[i + 12]), 11, -421815835)
c = md5_hh(c, d, a, b, unwrap(x[i + 15]), 16, 530742520)
b = md5_hh(b, c, d, a, unwrap(x[i + 2]), 23, -995338651)
a = md5_ii(a, b, c, d, unwrap(x[i + 0]), 6 , -198630844)
d = md5_ii(d, a, b, c, unwrap(x[i + 7]), 10, 1126891415)
c = md5_ii(c, d, a, b, unwrap(x[i + 14]), 15, -1416354905)
b = md5_ii(b, c, d, a, unwrap(x[i + 5]), 21, -57434055)
a = md5_ii(a, b, c, d, unwrap(x[i + 12]), 6 , 1700485571)
d = md5_ii(d, a, b, c, unwrap(x[i + 3]), 10, -1894986606)
c = md5_ii(c, d, a, b, unwrap(x[i + 10]), 15, -1051523)
b = md5_ii(b, c, d, a, unwrap(x[i + 1]), 21, -2054922799)
a = md5_ii(a, b, c, d, unwrap(x[i + 8]), 6 , 1873313359)
d = md5_ii(d, a, b, c, unwrap(x[i + 15]), 10, -30611744)
c = md5_ii(c, d, a, b, unwrap(x[i + 6]), 15, -1560198380)
b = md5_ii(b, c, d, a, unwrap(x[i + 13]), 21, 1309151649)
a = md5_ii(a, b, c, d, unwrap(x[i + 4]), 6 , -145523070)
d = md5_ii(d, a, b, c, unwrap(x[i + 11]), 10, -1120210379)
c = md5_ii(c, d, a, b, unwrap(x[i + 2]), 15, 718787259)
b = md5_ii(b, c, d, a, unwrap(x[i + 9]), 21, -343485551)
a = safe_add(a, olda)
b = safe_add(b, oldb)
c = safe_add(c, oldc)
d = safe_add(d, oldd)
}
return [a, b, c, d]
}
// MARK: - Helper
func length(_ dictionary: [Int: Int32]) -> Int {
return (dictionary.keys.max() ?? 0) + 1
}
func dictionary2array(_ dictionary: [Int: Int32]) -> [Int32] {
var array = Array<Int32>(repeating: 0, count: dictionary.keys.count)
for i in Array(dictionary.keys).sorted() {
array[i] = unwrap(dictionary[i])
}
return array
}
func unwrap(_ value: Int32?, _ fallback: Int32 = 0) -> Int32 {
if let value = value {
return value
}
return fallback
}
func zeroFillRightShift(_ num: Int32, _ count: Int32) -> Int32 {
let value = UInt32(bitPattern: num) >> UInt32(bitPattern: count)
return Int32(bitPattern: value)
}