need help

This is a discussion on need help within the C++ Programming forums, part of the General Programming Boards category; So I am creating for my community a small program that can get my users Mac Address and give to ...

  1. #1
    Registered User
    Join Date
    Nov 2007
    Posts
    1

    need help

    So I am creating for my community a small program that can get my users Mac Address and give to me. after I have the Mac adress I want to encrypt it and give me a code that is simply to find the original not for example like md5. So I want to use it to authenticate my users, but I dont want to reveal this to them because after they will change their MacAdress and it will be the same problem. So a user is trying to connect at my site, I get his Mac adress I encrypt this and send it at my user. My user put this code tu be authenticated wheni receive this code I decrypt it and if the decrypted code is the same with the mac adress that I got from him he can enter

    Now i dont know how to put togather this three tapes so for taking the MAc Adress I am using this code:
    Code:
    static void GetMACaddress(void)
    {
      IP_ADAPTER_INFO AdapterInfo[16];       
                                             
      DWORD dwBufLen = sizeof(AdapterInfo);  
    
      DWORD dwStatus = GetAdaptersInfo(      
        AdapterInfo,                 
        &dwBufLen);                  
      assert(dwStatus == ERROR_SUCCESS);  
                                          
    
      PIP_ADAPTER_INFO pAdapterInfo = AdapterInfo; 
      do {
        PrintMACaddress(pAdapterInfo->Address); 
        pAdapterInfo = pAdapterInfo->Next;    
                                          
      }
      while(pAdapterInfo);                    
    }
    After i took the MAc I encrypt it at a .7pm

    Code:
    #include <CkCrypt2.h>
    #include <CkCert.h>
    
    void ChilkatSample(void)
        {
    
        CkCrypt2 crypt;
    
        //  Any string argument automatically begins the 30-day trial.
        bool success;
        success = crypt.UnlockComponent("30-day trial");
        if (success != true) {
            printf("Crypt component unlock failed\n");
            return;
        }
    
        //  Use public-key encryption with a digital certificate:
        crypt.put_CryptAlgorithm("pki");
    
        //  There are many ways to select and load a digital certificate.
        //  Certs can be retrieved from the Windows registry-based
        //  certificate stores, from database tables, files, etc.
        //  This example will load a .cer file.
        CkCert cert;
    
        success = cert.LoadFromFile("myCert.cer");
        if (success != true) {
            printf("%s\n",cert.lastErrorText());
            return;
        }
    
        crypt.SetEncryptCert(cert);
    
        //  The CkEncryptFile can encrypt files of any size.  The
        //  encryption occurs in streaming mode, so it is not necessary
        //  to hold the entire contents of the file in memory at once.
        success = crypt.CkEncryptFile("dude.gif","dude.p7m");
        if (success != true) {
            printf("%s\n",crypt.lastErrorText());
            return;
    }
     success = crypt.CkDecryptFile("dude.p7m","dudeOut.gif");
        if (success != true) {
            printf("%s\n",crypt.lastErrorText());
            return;
        }
    
    
        }
    this give me the encrypted code that i send at my user the user return it to me and I decrypt it

    Code:
    #include <CkCrypt2.h>
    #include <CkCreateCS.h>
    #include <CkCertStore.h>
    #include <CkCert.h>
    
    void ChilkatSample(void)
        {
        CkCrypt2 crypt;
    
        //  Any string argument automatically begins the 30-day trial.
        bool success;
        success = crypt.UnlockComponent("30-day trial");
        if (success != true) {
            printf("Crypt component unlock failed\n");
            return;
        }
    
        //  Find our digital certificate from the Current User certificate store.
        CkCreateCS ccs;
        CkCertStore *certStore = 0;
        certStore = ccs.OpenCurrentUserStore();
        CkCert *cert = 0;
        cert = certStore->FindCertBySubjectCN("Chilkat Software, Inc.");
        if (cert == 0 ) {
            printf("%s\n",cert->lastErrorText());
            delete certStore;
            return;
        }
    
        delete certStore;
    
        //  Verify and restore the original file:
        crypt.SetVerifyCert(*cert);
    
        success = crypt.VerifyP7S("license.p7s","license2.rtf");
        if (success == false) {
            printf("%s\n",crypt.lastErrorText());
            delete cert;
            return;
        }
    
        delete cert;
    
        printf("Success!\n");
        }
    the code for encrypting and decrypt i found around the web maybe they doesn't work so can anybody tell me another way to encrypt and decrypt the mac adress so the first step is to get th mac adress and encrypt it: i know how to get it but not to encrypt step 2 how to decrypt and verify it with the original code ifa are the same

    thank you very much

  2. #2
    C++まいる!Cをこわせ! Elysia's Avatar
    Join Date
    Oct 2007
    Posts
    22,452
    It's much better to encrypt your local mac and compare it to the encrypted mac address you recieved.

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