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Showing content from https://github.com/auth0/java-jwt below:

auth0/java-jwt: Java implementation of JSON Web Token (JWT)

Note As part of our ongoing commitment to best security practices, we have rotated the signing keys used to sign previous releases of this SDK. As a result, new patch builds have been released using the new signing key. Please upgrade at your earliest convenience.

While this change won't affect most developers, if you have implemented a dependency signature validation step in your build process, you may notice a warning that past releases can't be verified. This is expected, and a result of the key rotation process. Updating to the latest version will resolve this for you.

📚 Documentation - 🚀 Getting Started - 💻 API Reference 💬 Feedback

• Examples - code samples for common java-jwt scenarios.
• Docs site - explore our docs site and learn more about Auth0.

This library is supported for Java LTS versions 8, 11, and 17. For issues on non-LTS versions above 8, consideration will be given on a case-by-case basis.

java-jwt is intended for server-side JVM applications. Android applications should use JWTDecode.Android.

java-jwt supports the following algorithms for both signing and verification:

Note - Support for ECDSA with curve secp256k1 and SHA-256 (ES256K) has been dropped since it has been disabled in Java 15

⚠️ Important security note: JVM has a critical vulnerability for ECDSA Algorithms - CVE-2022-21449. Please review the details of the vulnerability and update your environment.

Add the dependency via Maven:

<dependency>
  <groupId>com.auth0</groupId>
  <artifactId>java-jwt</artifactId>
  <version>4.5.0</version>
</dependency>

or Gradle:

implementation 'com.auth0:java-jwt:4.5.0'

Use JWT.create(), configure the claims, and then call sign(algorithm) to sign the JWT.

The example below demonstrates this using the RS256 signing algorithm:

try {
    Algorithm algorithm = Algorithm.RSA256(rsaPublicKey, rsaPrivateKey);
    String token = JWT.create()
        .withIssuer("auth0")
        .sign(algorithm);
} catch (JWTCreationException exception){
    // Invalid Signing configuration / Couldn't convert Claims.
}

Create a JWTVerifier passing the Algorithm, and specify any required claim values.

The following example uses RS256 to verify the JWT.

String token = "eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXUyJ9.eyJpc3MiOiJhdXRoMCJ9.AbIJTDMFc7yUa5MhvcP03nJPyCPzZtQcGEp-zWfOkEE";
DecodedJWT decodedJWT;
try {
    Algorithm algorithm = Algorithm.RSA256(rsaPublicKey, rsaPrivateKey);
    JWTVerifier verifier = JWT.require(algorithm)
        // specify any specific claim validations
        .withIssuer("auth0")
        // reusable verifier instance
        .build();
        
    decodedJWT = verifier.verify(token);
} catch (JWTVerificationException exception){
    // Invalid signature/claims
}

If the token has an invalid signature or the Claim requirement is not met, a JWTVerificationException will be thrown.

See the examples and JavaDocs for additional documentation.

• java-jwt JavaDocs

We appreciate feedback and contribution to this repo! Before you get started, please see the following:

• Auth0's general contribution guidelines
• Auth0's code of conduct guidelines

To provide feedback or report a bug, please raise an issue on our issue tracker.

Please do not report security vulnerabilities on the public Github issue tracker. The Responsible Disclosure Program details the procedure for disclosing security issues.

Auth0 is an easy to implement, adaptable authentication and authorization platform. To learn more checkout Why Auth0?

This project is licensed under the MIT license. See the LICENSE file for more info.

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