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Using Java-TOTP with Spring Boot

Installation

To get started using the library in a Spring Boot project, add the totp-spring-boot-starter dependency:

Maven

<dependency>
  <groupId>dev.samstevens.totp</groupId>
  <artifactId>totp-spring-boot-starter</artifactId>
  <version>1.7.1</version>
</dependency>

Gradle

dependencies {
  compile 'dev.samstevens.totp:totp-spring-boot-starter:1.7.1'
}

Usage

Generating QR codes

@Controller
public class MfaSetupController {

    @Autowired
    private SecretGenerator secretGenerator;

    @Autowired
    private QrDataFactory qrDataFactory;

    @Autowired
    private QrGenerator qrGenerator;

    @GetMapping("/mfa/setup")
    public String setupDevice() throws QrGenerationException {
        // Generate and store the secret
        String secret = secretGenerator.generate();

        QrData data = qrDataFactory.newBuilder()
            .label("example@example.com")
            .secret(secret)
            .issuer("AppName")
            .build();

        // Generate the QR code image data as a base64 string which
        // can be used in an <img> tag:
        String qrCodeImage = getDataUriForImage(
          qrGenerator.generate(data), 
          qrGenerator.getImageMimeType()
        );
        ...
    }
}

Verifying a code

To verify a code that is submitted by a user, inject the CodeVerifier service and call isValidCode:

@Controller
public class MfaVerifyController {
    @Autowired
    private CodeVerifier verifier;

    @PostMapping("/mfa/verify")
    @ResponseBody
    public String verify(@RequestParam String code) {
        // secret is fetched from some storage

        if (verifier.isValidCode(secret, code)) {
            return "CORRECT CODE";
        }

        return "INCORRECT CODE";
    }
}

Generating recovery codes

To generate recovery codes, use the RecoveryCodeGenerator service:

Controller
public class MfaRecoveryCodesController {
    @Autowired
    private RecoveryCodeGenerator recoveryCodeGenerator;

    @GetMapping("/mfa/recovery-codes")
    public String recoveryCodes() {
        String[] codes = recoveryCodeGenerator.generateCodes(16);
        ...
    }
}

Configuring

Configuring the various options that are available with the library can be achieved by setting application properties or defining beans.

Secret Length

Set the totp.secret.length property to the desired number of characters in application.properties:

totp.secret.length=128
Code Length

Set the totp.code.length property to the desired number of characters in application.properties:

totp.code.length=8
Time Period

Set the totp.time.period property to the desired number of characters in application.properties:

totp.time.period=15
Time Discrepancy

Set the totp.time.discrepancy property to the desired number of characters in application.properties:

totp.time.discrepancy=2
Hashing Algorithm

The default hashing algorithm is SHA1. To change it to another algorithm, define a HashingAlgorithm bean which returns the desired algorithm:

@Configuration
public class AppConfig {
    @Bean
    public HashingAlgorithm hashingAlgorithm() {
        return HashingAlgorithm.SHA256;
    }
}
Time Provider

The default time provider uses the system time to fetch the time. To change this, define a TimeProvider bean that returns a TimeProvider instance.

@Configuration
public class AppConfig {
    @Bean
    public TimeProvider timeProvider() {
        return new NtpTimeProvider("pool.ntp.org");
    }
}