Generate Jwt Token With Private Key
Generate Jwt Token With Secret Key Online
Generate Jwt Token With Private Key Online

Within the App Credentials page of your JWT app, you will see an option to View JWT Token. Here you can quickly generate a temporary token using the current API Key and Secret for the given expiration time. This single temporary token can then be used to test Zoom APIs, but should never be used in production applications.

1. JWT Token Overview

JWT stands for JSON Web Token. JSON Web Token (JWT) is an open standard (RFC 7519) that defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed.
ACCESSTOKENSECRET is a secret key you use to generate JWT, In the example we are saving it in constant but for security, you should use an environment variable to pass this key. Below code will generate a 32 bytes secret or you can use any random secret code.
Within the App Credentials page of your JWT app, you will see an option to View JWT Token. Here you can quickly generate a temporary token using the current API Key and Secret for the given expiration time. This single temporary token can then be used to test Zoom APIs, but should never be used in production applications.
In this article we will see how we can create and sign a JWT token with the RS256 algorithm. This function is complementary to the validate function I posted some time ago. Here is the Sign(.) function that can create a RS256 signed JWT token. It makes use of the BouncyCastle library. It is available as a NuGet package with version 1.8.1.

JSON Web Token (JWT) is an open standard defines a compact and self-contained way for securely transmitting information between parties as a JSON object. This information can be verified and trusted because it is digitally signed. JWTs can be signed using a secret (with the HMAC algorithm) or a public/private key pair using RSA or ECDSA.

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Although JWTs can be encrypted to also provide secrecy between parties, we will focus on signed tokens. Signed tokens can verify the integrity of the claims contained within it, while encrypted tokens hide those claims from other parties. When tokens signs using public/private key pairs, the signature also certifies that only the party holding the private key is the one signed it.

1.1 What is JSON Web Token (JWT) Structure?

JWT tokens consist of 3 parts separated by a period ( . ).
These parts are:

Header
Payload
Signature

The JWT typically looks like:

2. Setting up JJWT library

To start using JJWT library for JWT generation, add following dependencies in your build.gradle file.

Alternatively if using Maven, add following dependencies in pom.xml

3. Create JWT Token

Jwts.builder() is used to create a JWT token. We can specify claims, subject and other JWT attribute.

Generated JWT Token:

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The above code to generate JWT is pretty self-explanatory however let’s check step by step how are we generating JWT token:

Add claims name and email with value Jane Doe and [email protected] respectively
Add subject in JWT token with value jane
Set Id for the JWT token using randomly generate GUID
Set issued at to current time
Set expiration to current time plus 5 minutes. So the JWT is valid for only 5 minutes

The JWT generated above is not signed (Check algorithm alg attribute in the header). We have just encoded the claims in JSON format. If using JWT for authentication or authorization it is advisable to Sign the JWT, so it can be verified.

4. Validate/Parse JWT Token

To validate or parse the JWT token, Jwts.parserBuilder() method is used.

While parsing the JWT token we need to pass Signing key to verify the JWT signature. Let us see how to sign the JWT token using different algorithms.

5. Create and Validate JWT Token Signed using HMAC Secret

The simplest way of creating a signed JWT token is by using HMAC secret. HMAC stands for hash-based message authentication code and is cryptographic hash function. It is used to simultaneously verify both the data integrity and the authenticity of a token.

5.1 Create JWT Token signed with HMAC

To create JWT token signed with HMAC shared secret, we need to specify signature using .signWith() method.

Generated JWT Token:

5.2 Validate/Parse JWT Token signed with HMAC

To validate/parse the JWT token generated using HMAC shared secret, the same steps can be applied. We need to use setSigningKey() method to set the key before we parse the JWT token.

Output:

If the JWT token expires (exp claim value is less than current system time), the parseClaimsJws() method will throw SignatureException.

6. Create and Validate JWT Token Signed using RSA Private Key

When using JWT token for microservice authentication/authorization it is advisable to sign with RSA Private/Public Keys instead of using Shared HMAC Secret. The token is generated and signed by a central authority (usually an Authorization Server) and each microservice can validate the JWT token using the Public Key exposed from Authorization Server.

Before we see how to generate JWT token with Private/Public key, let us see how to generate a Private and Public RSA Key pairs.

6.1 Generate Private and Public RSA Key

Generate an RSA private key, of size 2048, and output it to a file named key.pem:

Extract the public key from the key pair, which can be used in a certificate:

The key.pem file contains the private key generated using RSA and public.pem file contains public key.

6.2 Create JWT Token signed with RSA

Generate Jwt Token With Private Key

Following code snippets shows how to generate JWT Token Signed using RSA.

Generated J

Generate Jwt Token With Key