(Unicode C) Google Authenticator Algorithm
Example code implementing the Google Authenticator algorithm.
#include <C_CkCrypt2W.h>
void ChilkatSample(void)
{
const wchar_t *secretBase32;
HCkCrypt2W crypt;
const wchar_t *otp;
// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.
// Generating TOTP Base32 Secret:
// When you enable 2FA with a TOTP-based authenticator app, Google will provide you with a QR code
// that you can scan using the app. This QR code contains a TOTP base32 secret.
// You can also choose to view and copy the secret manually.
secretBase32 = L"JBSWY3DPEHPK3PXP";
// Do the following to calculate the 6-digit decimal Google authenticator token for a base32 secret,
// given the current system date/time.
crypt = CkCrypt2W_Create();
otp = CkCrypt2W_totp(crypt,secretBase32,L"base32",L"0",L"",30,6,-1,L"sha1");
wprintf(L"6-digit decimal token = %s\n",otp);
CkCrypt2W_Dispose(crypt);
}
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