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A File Checksum Shell Menu Extension DLL

, 23 May 2008 LGPL3
Create a File Checksum Shell Menu Extension using ATL and Crypto++
CtxCreateHash
CtxCreateHash
CreateHash.rgs
CtxCreateHash.def
CtxCreateHash.rgs
CtxCreateHash.vcproj.8.00.old
CtxCreateHashps.def
CtxCreateHashPS.vcproj.8.00.old
CtxCreateHash.sln.old
CreateHash.rgs
CtxCreateHash.aps
CtxCreateHash.def
CtxCreateHash.rgs
CtxCreateHashps.def
CtxCreateHash.dll
CtxVerifyHash
CtxVerifyHash
CtxVerifyHash.def
CtxVerifyHash.rgs
CtxVerifyHash.vcproj.8.00.old
CtxVerifyHashps.def
CtxVerifyHashPS.vcproj.8.00.old
VerifyHash.rgs
CtxVerifyHash.sln.old
CtxVerifyHash.aps
CtxVerifyHash.def
CtxVerifyHash.rgs
CtxVerifyHashps.def
VerifyHash.rgs
CtxVerifyHash.dll
Sample 1
Test 1.dsp
Test 1.dsw
Sample 2
Test 2.dsp
Test 2.dsw
Sample 3
Test 3.dsp
Test 3.dsw
Sample 4
Test 4.dsp
Test 4.dsw
Sample 5
CtxTest.def
CtxTest.dsp
CtxTest.dsw
CtxTestps.def
CtxTestps.mk
MenuItem.rgs
// md2.cpp - modified by Wei Dai from Andrew M. Kuchling's md2.c
// The original code and all modifications are in the public domain.

// This is the original introductory comment:

/*
 *  md2.c : MD2 hash algorithm.
 *
 * Part of the Python Cryptography Toolkit, version 1.1
 *
 * Distribute and use freely; there are no restrictions on further 
 * dissemination and usage except those imposed by the laws of your 
 * country of residence.
 *
 */

#include "StdAfx.h"

#include "pch.h"
#include "md2.h"

NAMESPACE_BEGIN(CryptoPP)

MD2::MD2()
	: m_X(48), m_C(16), m_buf(16)
{
	Init();
}

void MD2::Init()
{
	memset(m_X, 0, 48);
	memset(m_C, 0, 16);
	memset(m_buf, 0, 16);
	m_count = 0;
}

void MD2::Update(const byte *buf, unsigned int len)
{
	static const byte S[256] = {
		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
	};

	while (len) 
    {
		word32 L = (16-m_count) < len ? (16-m_count) : len;
		memcpy(m_buf+m_count, buf, L);
		m_count+=L;
		buf+=L;
		len-=L;
		if (m_count==16) 
		{
			byte t;
			int i,j;
			
			m_count=0;
			memcpy(m_X+16, m_buf, 16);
			t=m_C[15];
			for(i=0; i<16; i++)
			{
				m_X[32+i]=m_X[16+i]^m_X[i];
				t=m_C[i]^=S[m_buf[i]^t];
			}
			
			t=0;
			for(i=0; i<18; i++)
			{
				for(j=0; j<48; j+=8)
				{
					t=m_X[j+0]^=S[t];
					t=m_X[j+1]^=S[t];
					t=m_X[j+2]^=S[t];
					t=m_X[j+3]^=S[t];
					t=m_X[j+4]^=S[t];
					t=m_X[j+5]^=S[t];
					t=m_X[j+6]^=S[t];
					t=m_X[j+7]^=S[t];
				}
				t=(t+i) & 0xFF;
			}
		}
    }
}

void MD2::TruncatedFinal(byte *hash, unsigned int size)
{
	ThrowIfInvalidTruncatedSize(size);

	byte padding[16];
	word32 padlen;
	unsigned int i;

	padlen= 16-m_count;
	for(i=0; i<padlen; i++) padding[i]=(byte)padlen;
	Update(padding, padlen);
	Update(m_C, 16);
	memcpy(hash, m_X, size);

	Init();
}

NAMESPACE_END

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This article, along with any associated source code and files, is licensed under The GNU Lesser General Public License (LGPLv3)

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About the Author

Jeffrey Walton
Systems / Hardware Administrator
United States United States
No Biography provided

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