C/C++ MD5 hash function

Easier than including the actual MD5 source in your projects.

Code:

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char* md5(char *data, char *hash) {
  HCRYPTPROV c_prov;
  HCRYPTHASH c_hash;
  BYTE raw_hash[64];
  DWORD len = sizeof(raw_hash);
  unsigned int i;
 
  if(CryptAcquireContext(&c_prov, NULL, NULL, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT) &&
      CryptCreateHash(c_prov, CALG_MD5, 0, 0, &c_hash) &&
      CryptHashData(c_hash, data, strlen(data), 0) &&
      CryptGetHashParam(c_hash, HP_HASHVAL, raw_hash, &len, 0) &&
      ((len * 2) + 1 <= 33)) {
      for(i=0;i<len;i++) {
        wsprintf(&hash[i * 2], TEXT("%02.2x"), raw_hash[i]);
      }     
  } else {
      return NULL;     
  }
             
  hash[33] = '\0';
  return hash;
}

int main(void)
{
  char hash[33];
 
  printf("%s\r\n", md5("string", hash));

  return 0;
}

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