GoogleAuth

https://github.com/wstrange/googleauth
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GoogleAuth is a Java server library for implementing server-side Time-based One-time Password (TOTP)...
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License:BSD-3-Clause
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### Create Google Authenticator Credentials - Java

Source: https://github.com/wstrange/googleauth/blob/master/README.md

This snippet demonstrates how to create new Google Authenticator credentials for a specified user and store them using the configured I'CredentialRepository'. It requires an instance of 'GoogleAuthenticator' and the username.

```java
GoogleAuthenticator gAuth = new GoogleAuthenticator();
final GoogleAuthenticatorKey key = gAuth.createCredentials("Bob");
```

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### Create TOTP Credentials in Java

Source: https://github.com/wstrange/googleauth/blob/master/README.md

This snippet demonstrates how to generate a new set of TOTP credentials using the GoogleAuthenticator library. It returns a GoogleAuthenticatorKey object containing the shared secret, which should be securely stored and provided to the user for device configuration.

```java
import com.warrenstrange.googleauth.GoogleAuthenticator;
import com.warrenstrange.googleauth.GoogleAuthenticatorKey;

// ...

GoogleAuthenticator gAuth = new GoogleAuthenticator();
final GoogleAuthenticatorKey key = gAuth.createCredentials();

String sharedSecret = key.getKey(); // This is the secret to be configured on the user's device
System.out.println("Shared Secret: " + sharedSecret);

```

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### Verify TOTP Password in Java

Source: https://github.com/wstrange/googleauth/blob/master/README.md

This code illustrates how to verify a TOTP password provided by a user against their stored Base32-encoded secret key. The `authorize` method checks the password against the current time window, considering a default tolerance. Adjusting the time window is possible during GoogleAuthenticator instantiation.

```java
import com.warrenstrange.googleauth.GoogleAuthenticator;

// ...

String secretKey = "YOUR_STORED_SECRET_KEY"; // The Base32-encoded secret key for the user
String password = "USER_ENTERED_PASSWORD";     // The TOTP code entered by the user

GoogleAuthenticator gAuth = new GoogleAuthenticator();
boolean isCodeValid = gAuth.authorize(secretKey, password);

if (isCodeValid) {
    System.out.println("Code is valid.");
} else {
    System.out.println("Code is invalid.");
}

```

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### Generate TOTP Code in Java (Client Simulation)

Source: https://github.com/wstrange/googleauth/blob/master/README.md

This snippet shows how the GoogleAuth library can be used to generate a TOTP code, simulating a client-side application like Google Authenticator. This is useful for testing purposes or building custom client applications. The generated code uses the provided Base32-encoded secret key.

```java
import com.warrenstrange.googleauth.GoogleAuthenticator;

// ...

String secretKey = "YOUR_STORED_SECRET_KEY"; // The Base32-encoded secret key

GoogleAuthenticator gAuth = new GoogleAuthenticator();
int totpCode = gAuth.getTotpPassword(secretKey);

System.out.println("Generated TOTP Code: " + totpCode);

```

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### Authorize User with Google Authenticator Code - Java

Source: https://github.com/wstrange/googleauth/blob/master/README.md

This snippet shows how to verify a provided code against a user's secret key stored in the I'CredentialRepository'. It utilizes an instance of 'GoogleAuthenticator' and requires the username and the authorization code.

```java
GoogleAuthenticator gAuth = new GoogleAuthenticator();
boolean isCodeValid = gAuth.authorizeUser("Bob", code);
```
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