Simple problem

[Maddox]

Well I wanted to put 2 c++ functions in a dll so I could use them in my vb project but when I comple I get these 2 errors:

D:\coding\madchat dll\Cdkeyhash.cpp(15) : error C2065: 'HashData' : undeclared identifier
D:\coding\madchat dll\Cdkeyhash.cpp(26) : error C2373: 'HashData' : redefinition; different type modifiers

heres the code:

#include <windows.h>
#include <stdlib.h>
#include <stdio.h>

#define ROL(nr, shift)	((nr << shift) | (nr >> (32 - shift)))

bool HashCDKey(DWORD*key, DWORD*seed, DWORD*prodid, DWORD*val1, DWORD*val2)
{
	DWORD dwHashBuff[5];
	dwHashBuff[0] = *key;
	dwHashBuff[1] = *seed;
	dwHashBuff[2] = *prodid;
	dwHashBuff[3] = *val1;
	dwHashBuff[4] = *val2;
	HashData(dwHashBuff, 20, dwHashBuff); 

	*key = dwHashBuff[0];
	*seed = dwHashBuff[1];
	*prodid = dwHashBuff[2];
	*val1 = dwHashBuff[3];
	*val2 = dwHashBuff[4];
	return TRUE;
}

void HashData(void* lpSource, int nLength, void* lpResult)
{
   BYTE bBuffer[1024];
   int i;
   DWORD a, b, c, d, e, g, * lpdwBuffer;

   ZeroMemory(bBuffer, 1024);
   CopyMemory(bBuffer, lpSource, nLength);
   lpdwBuffer = (LPDWORD) bBuffer;

   for (i=0; i<64; i++)
      lpdwBuffer[i+16] = ROL(1, (lpdwBuffer[i] ^ lpdwBuffer[i+8] ^
                             lpdwBuffer[i+2] ^ lpdwBuffer[i+13]) % 32);
   a = 0x67452301lu;
   b = 0xefcdab89lu;
   c = 0x98badcfelu;
   d = 0x10325476lu;
   e = 0xc3d2e1f0lu;
   for (i = 0; i < (20 * 1); i++)
   {
      g = lpdwBuffer[i] + ROL(a,5) + e + ((b & c) | (~b & d)) + 0x5a827999lu;
      e = d;
      d = c;
      c = ROL(b,30);
      b = a;
      a = g;
   }
   for (; i < (20 * 2); i++)
   {
      g = (d ^ c ^ b) + e + ROL(g,5) + lpdwBuffer[i] + 0x6ed9eba1lu;
      e = d;
      d = c;
      c = ROL(b,30);
      b = a;
      a = g;
   }
   for (; i < (20 * 3); i++)
   {
      g = lpdwBuffer[i] + ROL(g,5) + e + ((c & b) | (d & c) | (d & b)) -
          0x70e44324lu;
      e = d;
      d = c;
      c = ROL(b,30);
      b = a;
      a = g;
   }
   for (; i < (20 * 4); i++)
   {
      g = (d ^ c ^ b) + e + ROL(g,5) + lpdwBuffer[i] - 0x359d3e2alu;
      e = d;
      d = c;
      c = ROL(b,30);
      b = a;
      a = g;
   }

   lpdwBuffer = (LPDWORD) lpResult;
   lpdwBuffer[0] = 0x67452301lu + g;
   lpdwBuffer[1] = 0xefcdab89lu + b;
   lpdwBuffer[2] = 0x98badcfelu + c;
   lpdwBuffer[3] = 0x10325476lu + d;
   lpdwBuffer[4] = 0xc3d2e1f0lu + e;
   return;
}

[HairyDave]

I think you need a function prototype.

At the top of the file (or in a corresponding header file) you need the line:

void HashData(void* lpSource, int nLength, void* lpResult);

This has to appear before any other reference to the function. Both errors are caused by it. I tend to do this for every function used - its easier to see whats defined in the file.

HD