198 lines
6.3 KiB
C#
198 lines
6.3 KiB
C#
//
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// MD2Managed.cs - Message Digest 2 Managed Implementation
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//
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// Author:
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// Sebastien Pouliot (sebastien@ximian.com)
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//
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// (C) 2001-2003 Motus Technologies Inc. (http://www.motus.com)
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// Copyright (C) 2004-2005,2010 Novell, Inc (http://www.novell.com)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in 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,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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namespace Mono.Security.Cryptography {
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// References:
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// a. RFC1319: The MD2 Message-Digest Algorithm
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// http://www.ietf.org/rfc/rfc1319.txt
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#if !INSIDE_CORLIB
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public
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#endif
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class MD2Managed : MD2 {
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private byte[] state;
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private byte[] checksum;
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private byte[] buffer;
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private int count;
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private byte[] x;
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/// <summary>
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/// Permutation of 0..255 constructed from the digits of pi. It gives a
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/// "random" nonlinear byte substitution operation.
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/// </summary>
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private static readonly byte[] PI_SUBST = {
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41, 46, 67, 201, 162, 216, 124, 1, 61, 54, 84, 161, 236, 240, 6,
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19, 98, 167, 5, 243, 192, 199, 115, 140, 152, 147, 43, 217, 188,
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76, 130, 202, 30, 155, 87, 60, 253, 212, 224, 22, 103, 66, 111, 24,
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138, 23, 229, 18, 190, 78, 196, 214, 218, 158, 222, 73, 160, 251,
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245, 142, 187, 47, 238, 122, 169, 104, 121, 145, 21, 178, 7, 63,
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148, 194, 16, 137, 11, 34, 95, 33, 128, 127, 93, 154, 90, 144, 50,
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39, 53, 62, 204, 231, 191, 247, 151, 3, 255, 25, 48, 179, 72, 165,
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181, 209, 215, 94, 146, 42, 172, 86, 170, 198, 79, 184, 56, 210,
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150, 164, 125, 182, 118, 252, 107, 226, 156, 116, 4, 241, 69, 157,
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112, 89, 100, 113, 135, 32, 134, 91, 207, 101, 230, 45, 168, 2, 27,
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96, 37, 173, 174, 176, 185, 246, 28, 70, 97, 105, 52, 64, 126, 15,
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85, 71, 163, 35, 221, 81, 175, 58, 195, 92, 249, 206, 186, 197,
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234, 38, 44, 83, 13, 110, 133, 40, 132, 9, 211, 223, 205, 244, 65,
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129, 77, 82, 106, 220, 55, 200, 108, 193, 171, 250, 36, 225, 123,
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8, 12, 189, 177, 74, 120, 136, 149, 139, 227, 99, 232, 109, 233,
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203, 213, 254, 59, 0, 29, 57, 242, 239, 183, 14, 102, 88, 208, 228,
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166, 119, 114, 248, 235, 117, 75, 10, 49, 68, 80, 180, 143, 237,
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31, 26, 219, 153, 141, 51, 159, 17, 131, 20 };
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private byte[] Padding (int nLength)
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{
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if (nLength > 0) {
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byte[] padding = new byte [nLength];
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for (int i = 0; i < padding.Length; i++)
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padding[i] = (byte) nLength;
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return padding;
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}
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return null;
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}
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//--- constructor -----------------------------------------------------------
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public MD2Managed () : base ()
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{
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// we allocate the context memory
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state = new byte [16];
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checksum = new byte [16];
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buffer = new byte [16];
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x = new byte [48];
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// the initialize our context
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Initialize ();
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}
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public override void Initialize ()
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{
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count = 0;
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Array.Clear (state, 0, 16);
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Array.Clear (checksum, 0, 16);
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Array.Clear (buffer, 0, 16);
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// Zeroize sensitive information
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Array.Clear (x, 0, 48);
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}
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protected override void HashCore (byte[] array, int ibStart, int cbSize)
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{
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int i;
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/* Update number of bytes mod 16 */
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int index = count;
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count = (int) (index + cbSize) & 0xf;
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int partLen = 16 - index;
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/* Transform as many times as possible. */
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if (cbSize >= partLen) {
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// MD2_memcpy((POINTER)&context->buffer[index], (POINTER)input, partLen);
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Buffer.BlockCopy (array, ibStart, buffer, index, partLen);
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// MD2Transform (context->state, context->checksum, context->buffer);
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MD2Transform (state, checksum, buffer, 0);
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for (i = partLen; i + 15 < cbSize; i += 16) {
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// MD2Transform (context->state, context->checksum, &input[i]);
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MD2Transform (state, checksum, array, ibStart + i);
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}
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index = 0;
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}
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else
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i = 0;
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/* Buffer remaining input */
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// MD2_memcpy((POINTER)&context->buffer[index], (POINTER)&input[i], inputLen-i);
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Buffer.BlockCopy (array, ibStart + i, buffer, index, (cbSize - i));
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}
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protected override byte[] HashFinal ()
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{
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// Pad out to multiple of 16.
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int index = count;
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int padLen = 16 - index;
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// is padding needed ? required if length not a multiple of 16.
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if (padLen > 0)
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HashCore (Padding (padLen), 0, padLen);
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// Extend with checksum
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HashCore (checksum, 0, 16);
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// Store state in digest
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byte[] digest = (byte[]) state.Clone ();
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// Zeroize sensitive information.
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Initialize ();
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return digest;
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}
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//--- private methods ---------------------------------------------------
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/// <summary>
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/// MD2 basic transformation. Transforms state and updates checksum
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/// based on block.
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/// </summary>
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private void MD2Transform (byte[] state, byte[] checksum, byte[] block, int index)
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{
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/* Form encryption block from state, block, state ^ block. */
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// MD2_memcpy ((POINTER)x, (POINTER)state, 16);
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Buffer.BlockCopy (state, 0, x, 0, 16);
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// MD2_memcpy ((POINTER)x+16, (POINTER)block, 16);
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Buffer.BlockCopy (block, index, x, 16, 16);
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// for (i = 0; i < 16; i++) x[i+32] = state[i] ^ block[i];
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for (int i = 0; i < 16; i++)
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x [i+32] = (byte) ((byte) state [i] ^ (byte) block [index + i]);
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/* Encrypt block (18 rounds). */
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int t = 0;
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for (int i = 0; i < 18; i++) {
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for (int j = 0; j < 48; j++ )
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t = x [j] ^= PI_SUBST [t];
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t = (t + i) & 0xff;
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}
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/* Save new state */
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// MD2_memcpy ((POINTER)state, (POINTER)x, 16);
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Buffer.BlockCopy (x, 0, state, 0, 16);
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/* Update checksum. */
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t = checksum [15];
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for (int i = 0; i < 16; i++)
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t = checksum [i] ^= PI_SUBST [block [index + i] ^ t];
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}
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}
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}
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