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291 lines
9.6 KiB
291 lines
9.6 KiB
//
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// String+MD5.swift
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// Kingfisher
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//
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// Created by Wei Wang on 18/09/25.
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//
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// Copyright (c) 2019 Wei Wang <onevcat@gmail.com>
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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import Foundation
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import CommonCrypto
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extension String: KingfisherCompatibleValue { }
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extension KingfisherWrapper where Base == String {
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var md5: String {
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guard let data = base.data(using: .utf8) else {
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return base
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}
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#if swift(>=5.0)
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let message = data.withUnsafeBytes { (bytes: UnsafeRawBufferPointer) in
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return [UInt8](bytes)
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}
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#else
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let message = data.withUnsafeBytes { bytes in
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return [UInt8](UnsafeBufferPointer(start: bytes, count: data.count))
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}
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#endif
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let MD5Calculator = MD5(message)
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let MD5Data = MD5Calculator.calculate()
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var MD5String = String()
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for c in MD5Data {
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MD5String += String(format: "%02x", c)
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}
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return MD5String
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}
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}
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// array of bytes, little-endian representation
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func arrayOfBytes<T>(_ value: T, length: Int? = nil) -> [UInt8] {
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let totalBytes = length ?? (MemoryLayout<T>.size * 8)
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let valuePointer = UnsafeMutablePointer<T>.allocate(capacity: 1)
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valuePointer.pointee = value
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let bytes = valuePointer.withMemoryRebound(to: UInt8.self, capacity: totalBytes) { (bytesPointer) -> [UInt8] in
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var bytes = [UInt8](repeating: 0, count: totalBytes)
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for j in 0..<min(MemoryLayout<T>.size, totalBytes) {
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bytes[totalBytes - 1 - j] = (bytesPointer + j).pointee
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}
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return bytes
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}
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#if swift(>=4.1)
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valuePointer.deinitialize(count: 1)
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valuePointer.deallocate()
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#else
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valuePointer.deinitialize()
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valuePointer.deallocate(capacity: 1)
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#endif
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return bytes
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}
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extension Int {
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// Array of bytes with optional padding (little-endian)
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func bytes(_ totalBytes: Int = MemoryLayout<Int>.size) -> [UInt8] {
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return arrayOfBytes(self, length: totalBytes)
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}
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}
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extension NSMutableData {
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// Convenient way to append bytes
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func appendBytes(_ arrayOfBytes: [UInt8]) {
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append(arrayOfBytes, length: arrayOfBytes.count)
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}
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}
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protocol HashProtocol {
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var message: [UInt8] { get }
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// Common part for hash calculation. Prepare header data.
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func prepare(_ len: Int) -> [UInt8]
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}
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extension HashProtocol {
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func prepare(_ len: Int) -> [UInt8] {
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var tmpMessage = message
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// Step 1. Append Padding Bits
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tmpMessage.append(0x80) // append one bit (UInt8 with one bit) to message
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// append "0" bit until message length in bits ≡ 448 (mod 512)
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var msgLength = tmpMessage.count
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var counter = 0
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while msgLength % len != (len - 8) {
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counter += 1
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msgLength += 1
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}
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tmpMessage += [UInt8](repeating: 0, count: counter)
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return tmpMessage
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}
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}
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func toUInt32Array(_ slice: ArraySlice<UInt8>) -> [UInt32] {
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var result = [UInt32]()
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result.reserveCapacity(16)
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for idx in stride(from: slice.startIndex, to: slice.endIndex, by: MemoryLayout<UInt32>.size) {
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let d0 = UInt32(slice[idx.advanced(by: 3)]) << 24
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let d1 = UInt32(slice[idx.advanced(by: 2)]) << 16
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let d2 = UInt32(slice[idx.advanced(by: 1)]) << 8
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let d3 = UInt32(slice[idx])
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let val: UInt32 = d0 | d1 | d2 | d3
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result.append(val)
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}
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return result
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}
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struct BytesIterator: IteratorProtocol {
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let chunkSize: Int
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let data: [UInt8]
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init(chunkSize: Int, data: [UInt8]) {
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self.chunkSize = chunkSize
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self.data = data
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}
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var offset = 0
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mutating func next() -> ArraySlice<UInt8>? {
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let end = min(chunkSize, data.count - offset)
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let result = data[offset..<offset + end]
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offset += result.count
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return result.count > 0 ? result : nil
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}
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}
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struct BytesSequence: Sequence {
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let chunkSize: Int
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let data: [UInt8]
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func makeIterator() -> BytesIterator {
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return BytesIterator(chunkSize: chunkSize, data: data)
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}
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}
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func rotateLeft(_ value: UInt32, bits: UInt32) -> UInt32 {
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return ((value << bits) & 0xFFFFFFFF) | (value >> (32 - bits))
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}
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class MD5: HashProtocol {
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static let size = 16 // 128 / 8
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let message: [UInt8]
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init (_ message: [UInt8]) {
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self.message = message
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}
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// specifies the per-round shift amounts
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private let shifts: [UInt32] = [7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
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5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20,
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4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
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6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21]
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// binary integer part of the sines of integers (Radians)
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private let sines: [UInt32] = [0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee,
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0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
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0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be,
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0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
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0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa,
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0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
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0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed,
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0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
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0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c,
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0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
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0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x4881d05,
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0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
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0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039,
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0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
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0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1,
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0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391]
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private let hashes: [UInt32] = [0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476]
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func calculate() -> [UInt8] {
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var tmpMessage = prepare(64)
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tmpMessage.reserveCapacity(tmpMessage.count + 4)
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// hash values
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var hh = hashes
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// Step 2. Append Length a 64-bit representation of lengthInBits
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let lengthInBits = (message.count * 8)
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let lengthBytes = lengthInBits.bytes(64 / 8)
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tmpMessage += lengthBytes.reversed()
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// Process the message in successive 512-bit chunks:
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let chunkSizeBytes = 512 / 8 // 64
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for chunk in BytesSequence(chunkSize: chunkSizeBytes, data: tmpMessage) {
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// break chunk into sixteen 32-bit words M[j], 0 ≤ j ≤ 15
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let M = toUInt32Array(chunk)
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assert(M.count == 16, "Invalid array")
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// Initialize hash value for this chunk:
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var A: UInt32 = hh[0]
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var B: UInt32 = hh[1]
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var C: UInt32 = hh[2]
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var D: UInt32 = hh[3]
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var dTemp: UInt32 = 0
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// Main loop
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for j in 0 ..< sines.count {
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var g = 0
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var F: UInt32 = 0
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switch j {
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case 0...15:
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F = (B & C) | ((~B) & D)
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g = j
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break
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case 16...31:
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F = (D & B) | (~D & C)
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g = (5 * j + 1) % 16
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break
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case 32...47:
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F = B ^ C ^ D
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g = (3 * j + 5) % 16
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break
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case 48...63:
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F = C ^ (B | (~D))
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g = (7 * j) % 16
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break
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default:
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break
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}
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dTemp = D
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D = C
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C = B
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B = B &+ rotateLeft((A &+ F &+ sines[j] &+ M[g]), bits: shifts[j])
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A = dTemp
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}
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hh[0] = hh[0] &+ A
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hh[1] = hh[1] &+ B
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hh[2] = hh[2] &+ C
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hh[3] = hh[3] &+ D
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}
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var result = [UInt8]()
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result.reserveCapacity(hh.count / 4)
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hh.forEach {
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let itemLE = $0.littleEndian
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let r1 = UInt8(itemLE & 0xff)
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let r2 = UInt8((itemLE >> 8) & 0xff)
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let r3 = UInt8((itemLE >> 16) & 0xff)
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let r4 = UInt8((itemLE >> 24) & 0xff)
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result += [r1, r2, r3, r4]
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}
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return result
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}
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}
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