Zig

Google Authenticator Algorithm

See more Encryption Examples

Example code implementing the Google Authenticator algorithm. Zig

const std = @import("std");
const chilkat = @import("chilkat");

pub fn main(init: std.process.Init) !void {
    const alloc = init.arena.allocator();

    // 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.

    const secret_base32 = "JBSWY3DPEHPK3PXP";

    // Do the following to calculate the 6-digit decimal Google authenticator token for a base32 secret,
    // given the current system date/time.
    const crypt = try chilkat.Crypt2.init();
    defer crypt.deinit();
    const otp = try crypt.totp(alloc, secret_base32, "base32", "0", "", 30, 6, -1, "sha1");

    std.debug.print("6-digit decimal token = {s}\n", .{otp});
}