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+/**
+ * MD2
+ *
+ * An ActionScript 3 implementation of the RSA Data Security, Inc MD2 Message
+ * Digest Algorithm, as defined in RFC 1319
+ * Copyright (c) 2007 Henri Torgemane
+ *
+ * See LICENSE.txt for full license information.
+ *
+ * Excerpt from http://en.wikipedia.org/wiki/MD2:
+ * >
+ * > Rogier and Chauvaud (1997) described collisions of MD2's compression function,
+ * > although they were unable to extend the attack to the full MD2.
+ * >
+ * > In 2004, MD2 was shown to be vulnerable to a preimage attack with time
+ * > complexity equivalent to 2104 applications of the compression function
+ * > (Muller, 2004).
+ * > The author concludes, "MD2 can no longer be considered a secure one-way
+ * > hash function".
+ *
+ * also, this implementaton is quite slow.
+ */
+
+package com.hurlant.crypto.hash
+{
+ import flash.utils.ByteArray;
+
+ public class MD2 implements IHash
+ {
+ public static const HASH_SIZE:int = 16;
+ public var pad_size:int = 48; // probably will never get used, only here for SSL 3.0 support
+
+ private static const S:Array = [ // PI Digits
+ 41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6, 19,
+ 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188, 76, 130, 202,
+ 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24, 138, 23, 229, 18,
+190, 78, 196, 214, 218, 158, 222, 73, 160, 251, 245, 142, 187, 47, 238, 122,
+169, 104, 121, 145, 21, 178, 7, 63, 148, 194, 16, 137, 11, 34, 95, 33,
+128, 127, 93, 154, 90, 144, 50, 39, 53, 62, 204, 231, 191, 247, 151, 3,
+255, 25, 48, 179, 72, 165, 181, 209, 215, 94, 146, 42, 172, 86, 170, 198,
+ 79, 184, 56, 210, 150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241,
+ 69, 157, 112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2,
+ 27, 96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
+ 85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197, 234, 38,
+ 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65, 129, 77, 82,
+106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123, 8, 12, 189, 177, 74,
+120, 136, 149, 139, 227, 99, 232, 109, 233, 203, 213, 254, 59, 0, 29, 57,
+242, 239, 183, 14, 102, 88, 208, 228, 166, 119, 114, 248, 235, 117, 75, 10,
+ 49, 68, 80, 180, 143, 237, 31, 26, 219, 153, 141, 51, 159, 17, 131, 20 ];
+
+
+ public function MD2() { }
+
+ public function getInputSize():uint
+ {
+ return 16;
+ }
+
+ public function getPadSize():int {
+ return pad_size;
+ }
+
+ public function getHashSize():uint
+ {
+ return HASH_SIZE;
+ }
+
+ public function hash(src:ByteArray):ByteArray
+ {
+ var savedLength:uint = src.length;
+
+ // 3.1 Step 1. Padding
+ var i:uint = (16-src.length%16) || 16;
+ do {
+ src[src.length]=i;
+ } while (src.length%16!=0);
+
+ // 3.2 Step 2. Checksum
+ var len:uint = src.length;
+ var checksum:ByteArray = new ByteArray;
+ var L:uint = 0;
+ for (i = 0;i<len;i+=16) {
+ for (var j:uint=0;j<16;j++) {
+ L = checksum[j] ^= S[src[i+j] ^ L];
+ }
+ }
+ src.position = src.length;
+ src.writeBytes(checksum);
+ len += 16;
+
+ // 3.3 Step 3. MD Buffer
+ var X:ByteArray = new ByteArray;
+
+ // 3.4 Process Message
+ for (i=0;i<len;i+=16) {
+
+ /* Copy block i into X */
+ for (j=0;j<16;j++) {
+ X[32+j] = (X[16+j] = src[i+j])^X[j];
+ }
+ var t:uint=0;
+ /* Do 18 rounds */
+ for (j=0;j<18;j++) {
+ /* Round j. */
+ for (var k:uint=0;k<48;k++) {
+ X[k] = t = X[k]^S[t];
+ }
+ t = (t+j)&0xff;
+ }
+ }
+ // 3.5 Step 5. Output
+ X.length = 16;
+ // restore original length;
+ src.length = savedLength;
+ return X;
+ }
+
+ public function toString():String
+ {
+ return "md2";
+ }
+
+ }
+}