🔐 simple_totp_auth

A lightweight Flutter package for generating, verifying, and sharing Time-based One-Time Passwords (TOTP) using QR codes — perfect for adding secure 2FA (Two-Factor Authentication) to any app.

✅ Compatible with Google Authenticator, Microsoft Authenticator, Authy, and more!

Demo Screenshots

✨ Features

• 🔑 Generate secure Base32 TOTP secrets
• 🕒 Create & verify 6-digit TOTP codes (RFC 6238)
• 📱 Generate otpauth:// URIs
• 📷 Display QR codes for Authenticator setup
• 📋 Copy secrets to clipboard (cross-platform support)
• 🧩 Flutter Widget for QR with custom size, color, and logo

🚀 Installation

dependencies:
  simple_totp_auth: ^0.0.2

🧪 Usage

🔐 Generate a Secure Secret Key

final secret = TOTP.generateSecret();

🧮 Generate a TOTP Code (Valid for 30 seconds)

final totp = TOTP(secret: secret);
final code = totp.now();
print("Code: $code");

✅ Verify a Code

final totp = TOTP(secret: secret);
final code = totp.now();
print("Code: $code");

📡 Generate QR-Compatible URI

final uri = totp.generateOTPAuthURI(
  issuer: "MyApp",
  account: "user@example.com",
);
print(uri);

📷 Display the QR Code in Your App

TOTPQrWidget(
  secret: secret,
  issuer: 'MyApp',
  accountName: 'user@example.com',
  logoType: LogoType.asset,         // Choose asset or network
  logoPath: 'images/logo.png',      // Path to the asset or URL for network image
  width: 200,
  height: 200,
  color: Colors.white,
  radiusColor: Colors.blue,
  radiusWidth: 2,
  radius: 16,
  padding: 8,
  margin: 8,
)

📋 Copy Secret to Clipboard (with feedback)

final result = await TOTPUtils.copyToClipboard(secret);
print(result); // "Success" or error message

📦 Platform Support

Platform	Support
✅ Android	Yes
✅ iOS	Yes
✅ Web	Yes
✅ Windows	Yes
✅ macOS	Yes
✅ Linux	Yes

Works across all 6 major platforms with no native plugins!

☕ Support the Developer

If you found this package helpful, consider buying me a coffee:

Thanks for using simple_totp_auth ❤️