(MFC) Generate TOTP using Base32 Secret (6 Digits, Time-based, 30-second period)

Generates a 6-digit time-based TOTP code using a base32 secret with a 30-second time period.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkCrypt2.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.
    // 
    CkCrypt2 crypt;

    // Base32 secret key:
    const char *secretKey = "oebf ytfl qmzb p4xd 2ztf zyz4 hjrw 3uyo";

    CkStringBuilder sbKey;
    bool success = sbKey.Append(secretKey);

    // Remove SPACE chars.
    int numRemoved = sbKey.Replace(" ","");

    // Note: A new token is generated every 30 seconds.  You must generate within the same 30 second interval to get the same result.

    // Generate 6 digits.
    int numDigits = 6;
    // 30 second time period.
    int timePeriod = 30;
    strOut.append("Your token is: ");
    strOut.append(crypt.totp(sbKey.getAsString(),"base32","0","",timePeriod,numDigits,-1,"sha1"));
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }