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VC编程实现MD5算法

VC编程

先介绍一款小巧的hash工具，就是下图这个，可以计算文件的md5值，SHA1值和CRC32值 。不到100kb，功能也很简单，就是对文件进行校验，检查是否被篡改过 。

VC编程实现MD5算法

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对于网上下载linux操作系统和windows操作系统，进行安装的人会很方便，校验后对比官方提供的校验值 。可知道文件是否被篡改了，是否被添加了不明来源程序 。
下面我们通过编程实现它，这个是界面 。
VC编程实现MD5算法

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这里只实现了md5校验 。
关键函数如下，线程中计算md5值 。
UINT ThreadProc(LPVOID pParam){ b_IsRunning = 1; g_csThreadRunning.Lock(); CHashDlg *myHashDlg = (CHashDlg*)pParam; int m_TotalFiles = myHashDlg->m_FileArray.GetCount(); myHashDlg->m_ProgressTotal.SetRange(0, m_TotalFiles); for (int i = 0; i < m_TotalFiles; i++) {MD5_CTX md5_ctx;unsigned char decrypt[16];char* m_binbuf;ULONGLONG m_binlen;CFile BinFile;if (!BinFile.Open((LPCTSTR)(myHashDlg->m_FileArray.GetAt(i)), CFile::modeRead | CFile::typeBinary)) {continue;}m_binlen = BinFile.GetLength();int totalBlock = m_binlen / 102400 + 1;myHashDlg->m_ProgressFile.SetRange(0, totalBlock);m_binbuf = new char[1024000];int totalread = 0;MD5Init(&md5_ctx);for (;;) {int readlen = BinFile.Read(m_binbuf, 1024000);if (readlen <= 0) {break;}totalread += readlen;myHashDlg->m_ProgressFile.SetPos(totalread / 102400);MD5Update(&md5_ctx, (PUCHAR)m_binbuf, readlen);if (b_IsRunning != 1) {break;}}myHashDlg->m_ProgressFile.SetPos(totalBlock);delete[] m_binbuf;MD5Final(&md5_ctx, decrypt);BinFile.Close();myHashDlg->m_ProgressTotal.SetPos(i);if (b_IsRunning != 1) {break;}CString md5String;for (int i = 0; i < 16; i++){//printf("%02x", decrypt[i]);TCHAR szW[20];_stprintf_s(szW, 20, _T("%02X"), decrypt[i]);md5String.Append(szW);}CString strFileLen;strFileLen.Format(_T("%lld bytes"), m_binlen);myHashDlg->m_MD5Result += _T("File: ");myHashDlg->m_MD5Result += myHashDlg->m_FileArray.GetAt(i);myHashDlg->m_MD5Result += _T("rn");myHashDlg->m_MD5Result += _T("Size: ");myHashDlg->m_MD5Result += strFileLen;myHashDlg->m_MD5Result += _T("rn");myHashDlg->m_MD5Result += md5String;myHashDlg->m_MD5Result += _T("rn");myHashDlg->m_MD5Result += _T("rn");myHashDlg->SendMessage(WM_UPDATEMYDATA, FALSE); } myHashDlg->m_ProgressTotal.SetPos(m_TotalFiles); g_csThreadRunning.Unlock(); return 0;}选择文件函数，选择后开始计算 。
void CHashDlg::OnBnClickedButtonSelectFiles(){ CFileDialogDlg(TRUE, NULL, NULL, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT | OFN_ALLOWMULTISELECT); if (Dlg.DoModal() == IDOK) {b_IsRunning = 0;g_csThreadRunning.Lock();m_FileArray.RemoveAll();POSITION pos = Dlg.GetStartPosition();while (pos){m_FileArray.Add(Dlg.GetNextPathName(pos));}g_csThreadRunning.Unlock();if (m_FileArray.GetCount() > 0) {b_IsRunning = 1;CWinThread* pThread = AfxBeginThread(ThreadProc, this);} }} 
下面是md5算法实现文件
#pragma once#include <string>#include <fstream>typedef unsigned char*PUCHAR;typedef unsigned short intUINT2;typedef unsigned intUINT4;typedef unsigned charUCHAR;typedef struct{ UINT4 state[4]; UINT4 count[2]; UCHAR buffer[64];} MD5_CTX;void MD5Init(MD5_CTX* context);void MD5Update(MD5_CTX* context, PUCHAR input, UINT4 inputLen);void MD5Final(MD5_CTX* context, UCHAR digest[16]);#include "pch.h"#include "MD5.h"/* Constants for MD5Transform routine. */#define S11 7#define S12 12#define S13 17#define S14 22#define S21 5#define S22 9#define S23 14#define S24 20#define S31 4#define S32 11#define S33 16#define S34 23#define S41 6#define S42 10#define S43 15#define S44 21static void MD5Transform(UINT4[4], UCHAR[64]);static void MD5Encode(PUCHAR, UINT4*, UINT4);static void MD5Decode(UINT4*, PUCHAR, UINT4);static void MD5_memcpy(PUCHAR, PUCHAR, UINT4);static void MD5_memset(PUCHAR, int, UINT4);static UCHAR PADDING[64] ={0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0};/* F, G, H and I are basic MD5 functions. */#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))#define H(x, y, z) ((x) ^ (y) ^ (z))#define I(x, y, z) ((y) ^ ((x) | (~z)))/* ROTATE_LEFT rotates x left n bits. */#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))/*FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.Rotation is separate from addition to prevent recomputation.*/#define FF(a, b, c, d, x, s, ac) {(a) += F ((b), (c), (d)) + (x) + (UINT4)(ac);(a) = ROTATE_LEFT ((a), (s));(a) += (b);}#define GG(a, b, c, d, x, s, ac) {(a) += G ((b), (c), (d)) + (x) + (UINT4)(ac);(a) = ROTATE_LEFT ((a), (s));(a) += (b);}#define HH(a, b, c, d, x, s, ac) {(a) += H ((b), (c), (d)) + (x) + (UINT4)(ac);(a) = ROTATE_LEFT ((a), (s));(a) += (b);}#define II(a, b, c, d, x, s, ac) {(a) += I ((b), (c), (d)) + (x) + (UINT4)(ac);(a) = ROTATE_LEFT ((a), (s));(a) += (b);}/* MD5 initialization. Begins an MD5 operation, writing a new context. */void MD5Init(MD5_CTX* context){context->count[0] = context->count[1] = 0;/* Load magic initialization constants.*/context->state[0] = 0x67452301;context->state[1] = 0xefcdab89;context->state[2] = 0x98badcfe;context->state[3] = 0x10325476;}/* MD5 block update operation. Continues an MD5 message-digestoperation, processing another message block, and updating thecontext.*/void MD5Update(MD5_CTX* context, PUCHAR input, UINT4 inputLen){UINT4 i, index, partLen;/* Compute number of bytes mod 64 */index = (UINT4)((context->count[0] >> 3) & 0x3F);/* Update number of bits */if ((context->count[0] += ((UINT4)inputLen << 3)) < ((UINT4)inputLen << 3))context->count[1]++;context->count[1] += ((UINT4)inputLen >> 29);partLen = 64 - index;/* Transform as many times as possible.*/if (inputLen >= partLen){MD5_memcpy((PUCHAR)&context->buffer[index], (PUCHAR)input, partLen);MD5Transform(context->state, context->buffer);for (i = partLen; i + 63 < inputLen; i += 64)MD5Transform(context->state, &input[i]);index = 0;}elsei = 0;/* Buffer remaining input */MD5_memcpy((PUCHAR)&context->buffer[index], (PUCHAR)&input[i], inputLen - i);}/* MD5 finalization. Ends an MD5 message-digest operation, writing the the message digest and zeroizing the context.*/void MD5Final(MD5_CTX* context, UCHAR digest[16]){UCHAR bits[8];UINT4 index, padLen;/* Save number of bits */MD5Encode(bits, context->count, 8);/* Pad out to 56 mod 64.*/index = (UINT4)((context->count[0] >> 3) & 0x3f);padLen = (index < 56) ? (56 - index) : (120 - index);MD5Update(context, PADDING, padLen);/* Append length (before padding) */MD5Update(context, bits, 8);/* Store state in digest */MD5Encode(digest, context->state, 16);/* Zeroize sensitive information.*/MD5_memset((PUCHAR)context, 0, sizeof(*context));}/* MD5 basic transformation. Transforms state based on block. */static void MD5Transform(UINT4 state[], UCHAR block[]){UINT4 a = state[0], b = state[1], c = state[2], d = state[3];UINT4 x[16];MD5Decode(x, block, 64);/* Round 1 */FF(a, b, c, d, x[0], S11, 0xd76aa478); /* 1 */FF(d, a, b, c, x[1], S12, 0xe8c7b756); /* 2 */FF(c, d, a, b, x[2], S13, 0x242070db); /* 3 */FF(b, c, d, a, x[3], S14, 0xc1bdceee); /* 4 */FF(a, b, c, d, x[4], S11, 0xf57c0faf); /* 5 */FF(d, a, b, c, x[5], S12, 0x4787c62a); /* 6 */FF(c, d, a, b, x[6], S13, 0xa8304613); /* 7 */FF(b, c, d, a, x[7], S14, 0xfd469501); /* 8 */FF(a, b, c, d, x[8], S11, 0x698098d8); /* 9 */FF(d, a, b, c, x[9], S12, 0x8b44f7af); /* 10 */FF(c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */FF(b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */FF(a, b, c, d, x[12], S11, 0x6b901122); /* 13 */FF(d, a, b, c, x[13], S12, 0xfd987193); /* 14 */FF(c, d, a, b, x[14], S13, 0xa679438e); /* 15 */FF(b, c, d, a, x[15], S14, 0x49b40821); /* 16 *//* Round 2 */GG(a, b, c, d, x[1], S21, 0xf61e2562); /* 17 */GG(d, a, b, c, x[6], S22, 0xc040b340); /* 18 */GG(c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */GG(b, c, d, a, x[0], S24, 0xe9b6c7aa); /* 20 */GG(a, b, c, d, x[5], S21, 0xd62f105d); /* 21 */GG(d, a, b, c, x[10], S22, 0x2441453); /* 22 */GG(c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */GG(b, c, d, a, x[4], S24, 0xe7d3fbc8); /* 24 */GG(a, b, c, d, x[9], S21, 0x21e1cde6); /* 25 */GG(d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */GG(c, d, a, b, x[3], S23, 0xf4d50d87); /* 27 */GG(b, c, d, a, x[8], S24, 0x455a14ed); /* 28 */GG(a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */GG(d, a, b, c, x[2], S22, 0xfcefa3f8); /* 30 */GG(c, d, a, b, x[7], S23, 0x676f02d9); /* 31 */GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 *//* Round 3 */HH(a, b, c, d, x[5], S31, 0xfffa3942); /* 33 */HH(d, a, b, c, x[8], S32, 0x8771f681); /* 34 */HH(c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */HH(b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */HH(a, b, c, d, x[1], S31, 0xa4beea44); /* 37 */HH(d, a, b, c, x[4], S32, 0x4bdecfa9); /* 38 */HH(c, d, a, b, x[7], S33, 0xf6bb4b60); /* 39 */HH(b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */HH(a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */HH(d, a, b, c, x[0], S32, 0xeaa127fa); /* 42 */HH(c, d, a, b, x[3], S33, 0xd4ef3085); /* 43 */HH(b, c, d, a, x[6], S34, 0x4881d05); /* 44 */HH(a, b, c, d, x[9], S31, 0xd9d4d039); /* 45 */HH(d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */HH(c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */HH(b, c, d, a, x[2], S34, 0xc4ac5665); /* 48 *//* Round 4 */II(a, b, c, d, x[0], S41, 0xf4292244); /* 49 */II(d, a, b, c, x[7], S42, 0x432aff97); /* 50 */II(c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */II(b, c, d, a, x[5], S44, 0xfc93a039); /* 52 */II(a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */II(d, a, b, c, x[3], S42, 0x8f0ccc92); /* 54 */II(c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */II(b, c, d, a, x[1], S44, 0x85845dd1); /* 56 */II(a, b, c, d, x[8], S41, 0x6fa87e4f); /* 57 */II(d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */II(c, d, a, b, x[6], S43, 0xa3014314); /* 59 */II(b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */II(a, b, c, d, x[4], S41, 0xf7537e82); /* 61 */II(d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */II(c, d, a, b, x[2], S43, 0x2ad7d2bb); /* 63 */II(b, c, d, a, x[9], S44, 0xeb86d391); /* 64 */state[0] += a;state[1] += b;state[2] += c;state[3] += d;/* Zeroize sensitive information.*/MD5_memset((PUCHAR)x, (int)0, (UINT4)(sizeof(x)));}/*Encodes input (UINT4) into output (unsigned char). Assumes len is a multiple of 4.*/static void MD5Encode(PUCHAR output, UINT4* input, UINT4 len){UINT4 i, j;for (i = 0, j = 0; j < len; i++, j += 4){output[j] = (UCHAR)(input[i] & 0xff);output[j + 1] = (UCHAR)((input[i] >> 8) & 0xff);output[j + 2] = (UCHAR)((input[i] >> 16) & 0xff);output[j + 3] = (UCHAR)((input[i] >> 24) & 0xff);}}/* Decodes input (unsigned char) into output (UINT4). Assumes len is a multiple of 4.*/static void MD5Decode(UINT4* output, PUCHAR input, UINT4 len){UINT4 i, j;for (i = 0, j = 0; j < len; i++, j += 4)output[i] = ((UINT4)input[j]) | (((UINT4)input[j + 1]) << 8) | (((UINT4)input[j + 2]) << 16) | (((UINT4)input[j + 3]) << 24);}/* Note: Replace "for loop" with standard memcpy if possible. */static void MD5_memcpy(PUCHAR output, PUCHAR input, UINT4 len){UINT4 i;for (i = 0; i < len; i++)output[i] = input[i];}/* Note: Replace "for loop" with standard memset if possible. */static void MD5_memset(PUCHAR output, int value, UINT4 len){UINT4 i;for (i = 0; i < len; i++)((char*)output)[i] = (char)value;}


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