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123 lines
4.2 KiB
Markdown
123 lines
4.2 KiB
Markdown
[](https://travis-ci.org/jwtk/jjwt)
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# Java JWT: JSON Web Token for Java
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JJWT aims to be the easiest to use and understand library for creating and verifying JSON Web Tokens (JWTs) on the JVM.
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JJWT is a 'clean room' implementation based solely on the [JWT](https://tools.ietf.org/html/draft-ietf-oauth-json-web-token-25), [JWS](https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-31), [JWE](https://tools.ietf.org/html/draft-ietf-jose-json-web-encryption-31) and [JWA](https://tools.ietf.org/html/draft-ietf-jose-json-web-algorithms-31) RFC draft specifications.
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## Installation
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Use your favorite Maven-compatible build tool to pull the dependency (and its transitive dependencies) from Maven Central:
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```xml
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<dependency>
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<groupId>io.jsonwebtoken</groupId>
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<artifactId>jjwt</artifactId>
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<version>0.1</version>
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</dependency>
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```
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Note: JJWT depends on Jackson 2.x. If you're already using an older version of Jackson in your app, [read this](#olderJackson)
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## Usage
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Most complexity is hidden behind convenient and readable Builder chaining calls. Here's an example:
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```java
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import io.jsonwebtoken.Jwts;
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import static io.jsonwebtoken.SignatureAlgorithm.*;
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//Let's create a random signing key for testing:
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Random random = new SecureRandom();
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byte[] key = new byte[64];
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random.nextBytes(key);
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String compactJwt = Jwts.builder().setSubject("Joe").signWith(HS256, key).compact();
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```
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How easy was that!?
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Now let's verify the JWT (you should always discard JWTs that don't match an expected signature):
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```java
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Jwt jwt = Jwts.parser().setSigningKey(key).parse(compactJwt);
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assert ((Claims)jwt.getBody()).getSubject().equals("Joe");
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```
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You have to love one-line code snippets in Java!
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But what if signature validation failed? You can catch `SignatureException` and react accordingly:
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```java
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try {
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Jwts.parser().setSigningKey(key).parse(compactJwt);
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//OK, we can trust this JWT
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} catch (SignatureException e) {
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//don't trust the JWT!
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}
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```
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## Supported Features
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* Creating and parsing plaintext compact JWTs
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* Creating, parsing and verifying digitally signed compact JWTs (aka JWSs) with the following algorithms:
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* HS256: HMAC using SHA-384
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* HS384: HMAC using SHA-384
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* HS512: HMAC using SHA-512
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* RS256: RSASSA-PKCS-v1_5 using SHA-256
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* RS384: RSASSA-PKCS-v1_5 using SHA-384
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* RS512: RSASSA-PKCS-v1_5 using SHA-512
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* PS256: RSASSA-PSS using SHA-256 and MGF1 with SHA-256
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* PS384: RSASSA-PSS using SHA-384 and MGF1 with SHA-384
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* PS512: RSASSA-PSS using SHA-512 and MGF1 with SHA-512
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## Currently Unsupported Features
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* [Non-compact](https://tools.ietf.org/html/draft-ietf-jose-json-web-signature-31#section-7.2) serialization and parsing.
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* Elliptic Curve signature algorithms `ES256`, `ES384` and `ES512`.
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* JWE (Encryption for JWT)
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These feature sets will be implemented in a future release when possible. Community contributions are welcome!
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## Release Notes
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### 0.2
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#### More convenient Claims building
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This release adds convenience methods to the `JwtBuilder` interface so you can set claims directly on the builder without having to create a separate Claims instance/builder, reducing the amount of code you have to write. For example, this:
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```java
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Claims claims = Jwts.claims().setSubject("Joe");
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String compactJwt = Jwts.builder().setClaims(claims).signWith(HS256, key).compact();
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```
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can now be written as:
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```java
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String compactJwt = Jwts.builder().setSubject("Joe").signWith(HS256, key).compact();
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```
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A Claims instance based on the specified claims will be created and set as the JWT's payload automatically.
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<a name="olderJackson"></a>
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#### Already using an older Jackson dependency?
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JJWT depends on Jackson 2.4.x (or later). If you are already using a Jackson version in your own application less than 2.x, for example 1.9.x, you will likely see [runtime errors](https://github.com/jwtk/jjwt/issues/1). To avoid this, you should change your project build configuration to explicitly point to a 2.x version of Jackson. For example:
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```xml
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<dependency>
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<groupId>com.fasterxml.jackson.core</groupId>
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<artifactId>jackson-databind</artifactId>
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<version>2.4.2</version>
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</dependency>
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```
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