Data commit

Task/MD5-Implementation/Swift/md5-implementation-1.swift

@@ -0,0 +1,126 @@
+    import Foundation
+    public class MD5 {
+        /** specifies the per-round shift amounts */
+        private let s: [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 K: [UInt32] = (0 ..< 64).map { UInt32(0x100000000 * abs(sin(Double($0 + 1)))) }
+
+        let a0: UInt32 = 0x67452301
+        let b0: UInt32 = 0xefcdab89
+        let c0: UInt32 = 0x98badcfe
+        let d0: UInt32 = 0x10325476
+
+        private var message: NSData
+
+        //MARK: Public
+
+        public init(_ message: NSData) {
+            self.message = message
+        }
+
+        public func calculate() -> NSData? {
+            var tmpMessage: NSMutableData = NSMutableData(data: message)
+            let wordSize = sizeof(UInt32)
+
+            var aa = a0
+            var bb = b0
+            var cc = c0
+            var dd = d0
+
+            // Step 1. Append Padding Bits
+            tmpMessage.appendBytes([0x80]) // append one bit (Byte with one bit) to message
+
+            // append "0" bit until message length in bits ≡ 448 (mod 512)
+            while tmpMessage.length % 64 != 56 {
+                tmpMessage.appendBytes([0x00])
+            }
+
+            // Step 2. Append Length a 64-bit representation of lengthInBits
+            var lengthInBits = (message.length * 8)
+            var lengthBytes = lengthInBits.bytes(64 / 8)
+            tmpMessage.appendBytes(reverse(lengthBytes));
+
+            // Process the message in successive 512-bit chunks:
+            let chunkSizeBytes = 512 / 8
+            var leftMessageBytes = tmpMessage.length
+            for var i = 0; i < tmpMessage.length; i = i + chunkSizeBytes, leftMessageBytes -= chunkSizeBytes {
+                let chunk = tmpMessage.subdataWithRange(NSRange(location: i, length: min(chunkSizeBytes,leftMessageBytes)))
+
+                // break chunk into sixteen 32-bit words M[j], 0 ≤ j ≤ 15
+                // println("wordSize \(wordSize)");
+                var M:[UInt32] = [UInt32](count: 16, repeatedValue: 0)
+                for x in 0..<M.count {
+                    var range = NSRange(location:x * wordSize, length: wordSize)
+                    chunk.getBytes(&M[x], range:range);
+                }
+
+                // Initialize hash value for this chunk:
+                var A:UInt32 = a0
+                var B:UInt32 = b0
+                var C:UInt32 = c0
+                var D:UInt32 = d0
+
+                var dTemp:UInt32 = 0
+
+                // Main loop
+                for j in 0...63 {
+                    var g = 0
+                    var F:UInt32 = 0
+
+                    switch (j) {
+                    case 0...15:
+                        F = (B & C) | ((~B) & D)
+                        g = j
+                        break
+                    case 16...31:
+                        F = (D & B) | (~D & C)
+                        g = (5 * j + 1) % 16
+                        break
+                    case 32...47:
+                        F = B ^ C ^ D
+                        g = (3 * j + 5) % 16
+                        break
+                    case 48...63:
+                        F = C ^ (B | (~D))
+                        g = (7 * j) % 16
+                        break
+                    default:
+                        break
+                    }
+                    dTemp = D
+                    D = C
+                    C = B
+                    B = B &+ rotateLeft((A &+ F &+ K[j] &+ M[g]), s[j])
+                    A = dTemp
+                }
+
+                aa = aa &+ A
+                bb = bb &+ B
+                cc = cc &+ C
+                dd = dd &+ D
+            }
+
+            var buf: NSMutableData = NSMutableData();
+            buf.appendBytes(&aa, length: wordSize)
+            buf.appendBytes(&bb, length: wordSize)
+            buf.appendBytes(&cc, length: wordSize)
+            buf.appendBytes(&dd, length: wordSize)
+
+            return buf.copy() as? NSData;
+        }
+
+        //MARK: Class
+        class func calculate(message: NSData) -> NSData?
+        {
+            return MD5(message).calculate();
+        }
+
+        //MARK: Private
+        private func rotateLeft(x:UInt32, _ n:UInt32) -> UInt32 {
+            return (x &<< n) | (x &>> (32 - n))
+        }
+    }

Task/MD5-Implementation/Swift/md5-implementation-2.swift

@@ -0,0 +1,83 @@
+import Foundation
+
+let shift : [UInt32] = [7, 12, 17, 22, 5, 9, 14, 20, 4, 11, 16, 23, 6, 10, 15, 21]
+let table: [UInt32] = (0 ..< 64).map { UInt32(0x100000000 * abs(sin(Double($0 + 1)))) }
+
+func md5(var message: [UInt8]) -> [UInt8] {
+  var messageLenBits = UInt64(message.count) * 8
+  message.append(0x80)
+  while message.count % 64 != 56 {
+    message.append(0)
+  }
+
+  var lengthBytes = [UInt8](count: 8, repeatedValue: 0)
+  UnsafeMutablePointer<UInt64>(lengthBytes).memory = messageLenBits.littleEndian
+  message += lengthBytes
+
+  var a : UInt32 = 0x67452301
+  var b : UInt32 = 0xEFCDAB89
+  var c : UInt32 = 0x98BADCFE
+  var d : UInt32 = 0x10325476
+  for chunkOffset in stride(from: 0, to: message.count, by: 64) {
+    let chunk = UnsafePointer<UInt32>(UnsafePointer<UInt8>(message) + chunkOffset)
+    let originalA = a
+    let originalB = b
+    let originalC = c
+    let originalD = d
+    for j in 0 ..< 64 {
+      var f : UInt32 = 0
+      var bufferIndex = j
+      let round = j >> 4
+      switch round {
+      case 0:
+        f = (b & c) | (~b & d)
+      case 1:
+        f = (b & d) | (c & ~d)
+        bufferIndex = (bufferIndex*5 + 1) & 0x0F
+      case 2:
+        f = b ^ c ^ d
+        bufferIndex = (bufferIndex*3 + 5) & 0x0F
+      case 3:
+        f = c ^ (b | ~d)
+        bufferIndex = (bufferIndex * 7) & 0x0F
+      default:
+        assert(false)
+      }
+      let sa = shift[(round<<2)|(j&3)]
+      let tmp = a &+ f &+ UInt32(littleEndian: chunk[bufferIndex]) &+ table[j]
+      a = d
+      d = c
+      c = b
+      b = b &+ (tmp << sa | tmp >> (32-sa))
+    }
+    a = a &+ originalA
+    b = b &+ originalB
+    c = c &+ originalC
+    d = d &+ originalD
+  }
+
+  var result = [UInt8](count: 16, repeatedValue: 0)
+  for (i, n) in enumerate([a, b, c, d]) {
+    UnsafeMutablePointer<UInt32>(result)[i] = n.littleEndian
+  }
+  return result
+}
+
+func toHexString(bytes: [UInt8]) -> String {
+  return "".join(bytes.map { String(format:"%02x", $0) })
+}
+
+for (hashCode, string) in [
+  ("d41d8cd98f00b204e9800998ecf8427e", ""),
+  ("0cc175b9c0f1b6a831c399e269772661", "a"),
+  ("900150983cd24fb0d6963f7d28e17f72", "abc"),
+  ("f96b697d7cb7938d525a2f31aaf161d0", "message digest"),
+  ("c3fcd3d76192e4007dfb496cca67e13b", "abcdefghijklmnopqrstuvwxyz"),
+  ("d174ab98d277d9f5a5611c2c9f419d9f",
+    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789"),
+  ("57edf4a22be3c955ac49da2e2107b67a", "12345678901234567890" +
+    "123456789012345678901234567890123456789012345678901234567890")] {
+      println(hashCode)
+      println(toHexString(md5(Array(string.utf8))))
+      println()
+}