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217 lines
6.9 KiB
C++
217 lines
6.9 KiB
C++
//
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// MD2Engine.cpp
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//
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// $Id: //poco/svn/Foundation/src/MD2Engine.cpp#2 $
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//
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// Library: Foundation
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// Package: Crypt
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// Module: MD2Engine
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// Permission is hereby granted, free of charge, to any person or organization
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// obtaining a copy of the software and accompanying documentation covered by
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// this license (the "Software") to use, reproduce, display, distribute,
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// execute, and transmit the Software, and to prepare derivative works of the
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// Software, and to permit third-parties to whom the Software is furnished to
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// do so, all subject to the following:
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//
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// The copyright notices in the Software and this entire statement, including
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// the above license grant, this restriction and the following disclaimer,
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// must be included in all copies of the Software, in whole or in part, and
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// all derivative works of the Software, unless such copies or derivative
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// works are solely in the form of machine-executable object code generated by
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// a source language processor.
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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, TITLE AND NON-INFRINGEMENT. IN NO EVENT
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// SHALL THE COPYRIGHT HOLDERS OR ANYONE DISTRIBUTING THE SOFTWARE BE LIABLE
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// FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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// ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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// DEALINGS IN THE SOFTWARE.
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//
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//
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// MD2 (RFC 1319) algorithm:
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// Copyright (C) 1990-2, RSA Data Security, Inc. Created 1990. All
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// rights reserved.
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//
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// License to copy and use this software is granted for
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// non-commercial Internet Privacy-Enhanced Mail provided that it is
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// identified as the "RSA Data Security, Inc. MD2 Message Digest
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// Algorithm" in all material mentioning or referencing this software
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// or this function.
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//
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// RSA Data Security, Inc. makes no representations concerning either
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// the merchantability of this software or the suitability of this
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// software for any particular purpose. It is provided "as is"
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// without express or implied warranty of any kind.
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//
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// These notices must be retained in any copies of any part of this
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// documentation and/or software.
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//
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#include "Poco/MD2Engine.h"
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#include <cstring>
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namespace Poco {
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MD2Engine::MD2Engine()
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{
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_digest.reserve(16);
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reset();
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}
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MD2Engine::~MD2Engine()
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{
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reset();
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}
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void MD2Engine::updateImpl(const void* input_, unsigned inputLen)
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{
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const unsigned char* input = (const unsigned char*) input_;
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unsigned int i, index, partLen;
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/* Update number of bytes mod 16 */
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index = _context.count;
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_context.count = (index + inputLen) & 0xf;
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partLen = 16 - index;
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/* Transform as many times as possible. */
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if (inputLen >= partLen)
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{
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std::memcpy(&_context.buffer[index], input, partLen);
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transform(_context.state, _context.checksum, _context.buffer);
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for (i = partLen; i + 15 < inputLen; i += 16)
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transform(_context.state, _context.checksum, &input[i]);
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index = 0;
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}
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else i = 0;
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/* Buffer remaining input */
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std::memcpy(&_context.buffer[index], &input[i], inputLen-i);
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}
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unsigned MD2Engine::digestLength() const
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{
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return DIGEST_SIZE;
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}
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void MD2Engine::reset()
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{
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std::memset(&_context, 0, sizeof(_context));
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}
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const DigestEngine::Digest& MD2Engine::digest()
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{
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static const unsigned char* PADDING[] =
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{
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(unsigned char*) "",
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(unsigned char*) "\001",
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(unsigned char*) "\002\002",
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(unsigned char*) "\003\003\003",
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(unsigned char*) "\004\004\004\004",
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(unsigned char*) "\005\005\005\005\005",
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(unsigned char*) "\006\006\006\006\006\006",
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(unsigned char*) "\007\007\007\007\007\007\007",
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(unsigned char*) "\010\010\010\010\010\010\010\010",
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(unsigned char*) "\011\011\011\011\011\011\011\011\011",
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(unsigned char*) "\012\012\012\012\012\012\012\012\012\012",
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(unsigned char*) "\013\013\013\013\013\013\013\013\013\013\013",
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(unsigned char*) "\014\014\014\014\014\014\014\014\014\014\014\014",
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(unsigned char*) "\015\015\015\015\015\015\015\015\015\015\015\015\015",
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(unsigned char *) "\016\016\016\016\016\016\016\016\016\016\016\016\016\016",
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(unsigned char *) "\017\017\017\017\017\017\017\017\017\017\017\017\017\017\017",
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(unsigned char *) "\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020\020"
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};
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unsigned int index, padLen;
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/* Pad out to multiple of 16. */
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index = _context.count;
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padLen = 16 - index;
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update((const char*) PADDING[padLen], padLen);
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/* Extend with checksum */
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update((const char*) _context.checksum, 16);
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/* Store state in digest */
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_digest.clear();
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_digest.insert(_digest.begin(), _context.state, _context.state + 16);
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/* Zeroize sensitive information. */
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std::memset(&_context, 0, sizeof(_context));
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reset();
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return _digest;
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}
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void MD2Engine::transform(unsigned char state[16], unsigned char checksum[16], const unsigned char block[16])
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{
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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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static const unsigned char PI_SUBST[256] =
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{
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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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};
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unsigned int i, j, t;
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unsigned char x[48];
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/* Form encryption block from state, block, state ^ block. */
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std::memcpy(x, state, 16);
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std::memcpy(x+16, block, 16);
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for (i = 0; i < 16; i++)
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x[i+32] = state[i] ^ block[i];
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/* Encrypt block (18 rounds). */
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t = 0;
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for (i = 0; i < 18; i++)
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{
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for (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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std::memcpy(state, x, 16);
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/* Update checksum. */
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t = checksum[15];
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for (i = 0; i < 16; i++)
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t = checksum[i] ^= PI_SUBST[block[i] ^ t];
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/* Zeroize sensitive information. */
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std::memset(x, 0, sizeof(x));
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}
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} // namespace Poco
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