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Pods/Kingfisher/Sources/Utility/String+MD5.swift

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