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Цитата Drongo:
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1. Как получить контрольную сумму (MD5) файла »
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Код:  //#include "md5.h"
#include <WINDEF.H>
#include <stdio.h>
#ifdef __alpha
typedef unsigned int UINT4;
#else
typedef unsigned long int UINT4;
#endif
#define MD5_INIT_STATE_0 0x67452301
#define MD5_INIT_STATE_1 0xefcdab89
#define MD5_INIT_STATE_2 0x98badcfe
#define MD5_INIT_STATE_3 0x10325476
void MD5Init(void);
void MD5Update(unsigned char *bug, unsigned int len);
void MD5Final(char* cReturnStr);
void Transform(UINT4 *buf, UINT4 *in);
BYTE m_lpszBuffer[64];
ULONG m_nCount[2];
ULONG m_lMD5[4];
static unsigned char PADDING[64] = {
0x80, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00
};
#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)))
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
#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); \
}
void ByteToDWord(DWORD* Output, ULONG* Input, UINT nLength){
UINT i=0;
UINT j=0;
for (; j < nLength; i++, j += 4)
{
Output[i] = (ULONG)Input[j] |
(ULONG)Input[j+1] << 8 |
(ULONG)Input[j+2] << 16 |
(ULONG)Input[j+3] << 24;
}
}
void DWordToByte(unsigned char* Output, DWORD* Input, UINT nLength ){
UINT i = 0;
UINT j = 0;
for (; j < nLength; 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);
}
}
void MD5Init (void)
{
memset(m_lpszBuffer, 0, 64 );
m_nCount[0] = m_nCount[1] = 0;
m_lMD5[0] = MD5_INIT_STATE_0;
m_lMD5[1] = MD5_INIT_STATE_1;
m_lMD5[2] = MD5_INIT_STATE_2;
m_lMD5[3] = MD5_INIT_STATE_3;
}
void MD5Update (unsigned char *inBuf, unsigned int inLen)
{
register int i, ii;
int mdi;
UINT4 in[16];
mdi = (int)((m_nCount[0] >> 3) & 0x3F);
if ((m_nCount[0] + ((UINT4)inLen << 3)) < m_nCount[0])
m_nCount[1]++;
m_nCount[0] += ((UINT4)inLen << 3);
m_nCount[1] += ((UINT4)inLen >> 29);
while (inLen--) {
m_lpszBuffer[mdi++] = *inBuf++;
if (mdi == 0x40) {
for (i = 0, ii = 0; i < 16; i++, ii += 4)
in[i] = (((UINT4)m_lpszBuffer[ii+3]) << 24) |
(((UINT4)m_lpszBuffer[ii+2]) << 16) |
(((UINT4)m_lpszBuffer[ii+1]) << 8) |
((UINT4)m_lpszBuffer[ii]);
Transform (m_lMD5, in);
mdi = 0;
}
}
}
void MD5Final (char* cReturnStr)
{
unsigned char bits[8];
int nIndex;
unsigned int nPadLen;
const int nMD5Size = 16;
unsigned char lpszMD5[16];
char temp[2];
int i;
cReturnStr[0]='\0';
DWordToByte( bits, m_nCount, 8 );
nIndex = (int)((m_nCount[0] >> 3) & 0x3f);
nPadLen = (nIndex < 56) ? (56 - nIndex) : (120 - nIndex);
MD5Update (PADDING, nPadLen);
MD5Update (bits, 8);
DWordToByte( lpszMD5, m_lMD5, nMD5Size );
for (i=0; i < nMD5Size; i++)
{
if (lpszMD5[i] == 0) {
temp[0] = '0';
temp[1]='0';
}
else if (lpszMD5[i] <= 15) {
sprintf(temp,"0%x",lpszMD5[i]);
}
else {
sprintf(temp,"%x",lpszMD5[i]);
}
strcat(cReturnStr,temp);
}
lpszMD5[0]='\0';
}
void Transform(register UINT4 *buf,register UINT4 *in)
{
register UINT4 a = buf[0], b = buf[1], c = buf[2], d = buf[3];
#define S11 7
#define S12 12
#define S13 17
#define S14 22
FF ( a, b, c, d, in[ 0], S11, 0xD76AA478L);
FF ( d, a, b, c, in[ 1], S12, 0xE8C7B756L);
FF ( c, d, a, b, in[ 2], S13, 0x242070DBL);
FF ( b, c, d, a, in[ 3], S14, 0xC1BDCEEEL);
FF ( a, b, c, d, in[ 4], S11, 0xF57C0FAFL);
FF ( d, a, b, c, in[ 5], S12, 0x4787C62AL);
FF ( c, d, a, b, in[ 6], S13, 0xA8304613L);
FF ( b, c, d, a, in[ 7], S14, 0xFD469501L);
FF ( a, b, c, d, in[ 8], S11, 0x698098D8L);
FF ( d, a, b, c, in[ 9], S12, 0x8B44F7AFL);
FF ( c, d, a, b, in[10], S13, 0xFFFF5BB1L);
FF ( b, c, d, a, in[11], S14, 0x895CD7BEL);
FF ( a, b, c, d, in[12], S11, 0x6B901122L);
FF ( d, a, b, c, in[13], S12, 0xFD987193L);
FF ( c, d, a, b, in[14], S13, 0xA679438EL);
FF ( b, c, d, a, in[15], S14, 0x49B40821L);
#define S21 5
#define S22 9
#define S23 14
#define S24 20
GG ( a, b, c, d, in[ 1], S21, 0xF61E2562L);
GG ( d, a, b, c, in[ 6], S22, 0xC040B340L);
GG ( c, d, a, b, in[11], S23, 0x265E5A51L);
GG ( b, c, d, a, in[ 0], S24, 0xE9B6C7AAL);
GG ( a, b, c, d, in[ 5], S21, 0xD62F105DL);
GG ( d, a, b, c, in[10], S22, 0x02441453L);
GG ( c, d, a, b, in[15], S23, 0xD8A1E681L);
GG ( b, c, d, a, in[ 4], S24, 0xE7D3FBC8L);
GG ( a, b, c, d, in[ 9], S21, 0x21E1CDE6L);
GG ( d, a, b, c, in[14], S22, 0xC33707D6L);
GG ( c, d, a, b, in[ 3], S23, 0xF4D50D87L);
GG ( b, c, d, a, in[ 8], S24, 0x455A14EDL);
GG ( a, b, c, d, in[13], S21, 0xA9E3E905L);
GG ( d, a, b, c, in[ 2], S22, 0xFCEFA3F8L);
GG ( c, d, a, b, in[ 7], S23, 0x676F02D9L);
GG ( b, c, d, a, in[12], S24, 0x8D2A4C8AL);
#define S31 4
#define S32 11
#define S33 16
#define S34 23
HH ( a, b, c, d, in[ 5], S31, 0xFFFA3942L);
HH ( d, a, b, c, in[ 8], S32, 0x8771F681L);
HH ( c, d, a, b, in[11], S33, 0x6D9D6122L);
HH ( b, c, d, a, in[14], S34, 0xFDE5380CL);
HH ( a, b, c, d, in[ 1], S31, 0xA4BEEA44L);
HH ( d, a, b, c, in[ 4], S32, 0x4BDECFA9L);
HH ( c, d, a, b, in[ 7], S33, 0xF6BB4B60L);
HH ( b, c, d, a, in[10], S34, 0xBEBFBC70L);
HH ( a, b, c, d, in[13], S31, 0x289B7EC6L);
HH ( d, a, b, c, in[ 0], S32, 0xEAA127FAL);
HH ( c, d, a, b, in[ 3], S33, 0xD4EF3085L);
HH ( b, c, d, a, in[ 6], S34, 0x04881D05L);
HH ( a, b, c, d, in[ 9], S31, 0xD9D4D039L);
HH ( d, a, b, c, in[12], S32, 0xE6DB99E5L);
HH ( c, d, a, b, in[15], S33, 0x1FA27CF8L);
HH ( b, c, d, a, in[ 2], S34, 0xC4AC5665L);
#define S41 6
#define S42 10
#define S43 15
#define S44 21
II ( a, b, c, d, in[ 0], S41, 0xF4292244L);
II ( d, a, b, c, in[ 7], S42, 0x432AFF97L);
II ( c, d, a, b, in[14], S43, 0xAB9423A7L);
II ( b, c, d, a, in[ 5], S44, 0xFC93A039L);
II ( a, b, c, d, in[12], S41, 0x655B59C3L);
II ( d, a, b, c, in[ 3], S42, 0x8F0CCC92L);
II ( c, d, a, b, in[10], S43, 0xFFEFF47DL);
II ( b, c, d, a, in[ 1], S44, 0x85845DD1L);
II ( a, b, c, d, in[ 8], S41, 0x6FA87E4FL);
II ( d, a, b, c, in[15], S42, 0xFE2CE6E0L);
II ( c, d, a, b, in[ 6], S43, 0xA3014314L);
II ( b, c, d, a, in[13], S44, 0x4E0811A1L);
II ( a, b, c, d, in[ 4], S41, 0xF7537E82L);
II ( d, a, b, c, in[11], S42, 0xBD3AF235L);
II ( c, d, a, b, in[ 2], S43, 0x2AD7D2BBL);
II ( b, c, d, a, in[ 9], S44, 0xEB86D391L);
buf[0] += a;
buf[1] += b;
buf[2] += c;
buf[3] += d;
}
void GetMD5(char* pBuf, UINT nLength,char* cReturnStr){
MD5Init();
MD5Update(pBuf, nLength);
MD5Final(cReturnStr);
}
Для удобстава можно пользоватся этой функцией:
Код: AnsiString MD5(AnsiString in){char out_char[32];
MD5_hash_calculator::GetMD5(in.c_str(),in.Length(),out_char);
return AnsiString(out_char);}
Пример использования:
Код: AnsiString in = (InputBox("Borland C++ Builder FAQ", "Самый, самый форум: ", ""));
if (MD5(in) == "12d9e6b344f7cef712491290c67715b5")
{
ShowMessage("Правильно :)");
}
Источник |
Вот собственно, такой вопрос возник в связи с темой - 
так и по сию минуту пытался что-то сделать.
