![]() Taking a string and converting it to a byte array is convenient for humans to read.Īnti-pattern 1 above demonstrates this. "Yn2kjibddFAWtnPJ2AFlL8WXmohJMCvigQggaEypa5E=".getBytes("UTF-8")Īll of the HS type signature algorithms take a byte array. If we’ve ever seen JWT examples before, we’ve likely encountered one of these signing anti-pattern scenarios: This is very similar to the code that’s in the StaticJWTController.fixedBuilder method of the code project.Īt this point, it’s worth talking about a few anti-patterns related to JWTs and signing. ("Yn2kjibddFAWtnPJ2AFlL8WXmohJMCvigQggaEypa5E=") Here’s an example of the JJWT in action: String jws = Jwts.builder() In the sections that follow, we’ll examine each of these endpoints and the JJWT code contained in the handlers. Http POST HS256=base64-encoded-value HS384=base64-encoded-value HS512=base64-encoded-valueĮxplicitly set secrets to use in the application. ![]() Http Generate new signing keys and show them. Http Show the signing keys currently in use. Http Parse passed in JWT enforcing the 'iss' registered claim and the 'hasMotorcycle' custom claim īuild JWT from passed in claims (using general claims map)īuild JWT from passed in claims (using specific claims methods)īuild DEFLATE compressed JWT from passed in claims This example application exposes ten endpoints (we’re using httpie to interact with the application it can be found here): http localhost:8080 Available commands (assumes httpie - ): To run the JJWT Fun application, we’ll simply do the following: mvn clean spring-boot:run One of the great things about Spring Boot is how easy it is to build and fire up an application. Note: The project uses Spring Boot from the beginning, as it’s easy to interact with the API that it exposes. The code demonstrated in the following sections can be found here. Finally, we’ll see JWTs in action as CSRF tokens in a Spring Security, Spring Boot application. Then we’ll get into some extended features of the JJWT. The primary operations in using JJWT involve building and parsing JWTs. Forever free and open-source (Apache License, Version 2.0), it was designed with a builder-focused interface hiding most of its complexity. ![]() JJWT ( ) is a Java library providing end-to-end JSON Web Token creation and verification. As a result, this saves the server from maintaining additional state. The string representation of the JWT needs to match what’s stored server-wide, and we can ensure it’s not expired by inspecting the exp claim. We can verify the signature and use the information encoded in the JWT to confirm its validity. This brings us back to the benefits of using a JWT as our CSRF token. ![]() In actual practice, we use the term JWT to describe JWEs and JWSs. JWTs can also be encrypted, and are then a JWE. Technically, a JWT that’s been cryptographically signed is called a JWS. It looks like this in pseudo-code: computeHMACSHA256(īase64DecodeToByteArray("4pE8z3PBoHjnV1AhvGk+e8h2p+ShZpOnpr8cwHmMh1w=")Īs long as we know the secret, we can generate the signature ourself, and compare our result to the signature section of the JWT to verify that it hasn’t been tampered with. Below, we’ll use a random base64 encoded string (for readability) that’s converted into a byte array. Note that the secret is always a byte array, and should be of a length that makes sense for the algorithm used. in between) and passing it through the specified algorithm (in this case, HMAC using SHA-256), along with a known secret. Finally, we’ll create the signature section by taking the header and payload together (with the.
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