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https://github.com/DigitalAXPP/jwtPS
This module generates JSON Web Tokens in PowerShell.
https://github.com/DigitalAXPP/jwtPS
fsharp jwt powershell
Last synced: 3 months ago
JSON representation
This module generates JSON Web Tokens in PowerShell.
- Host: GitHub
- URL: https://github.com/DigitalAXPP/jwtPS
- Owner: DigitalAXPP
- License: mit
- Created: 2020-12-06T22:02:03.000Z (almost 4 years ago)
- Default Branch: main
- Last Pushed: 2023-12-11T21:00:26.000Z (11 months ago)
- Last Synced: 2024-01-15T00:59:01.271Z (10 months ago)
- Topics: fsharp, jwt, powershell
- Language: F#
- Homepage:
- Size: 1.23 MB
- Stars: 14
- Watchers: 1
- Forks: 2
- Open Issues: 1
-
Metadata Files:
- Readme: README.md
- License: LICENSE
- Code of conduct: CODE_OF_CONDUCT.md
Awesome Lists containing this project
- jimsghstars - DigitalAXPP/jwtPS - This module generates JSON Web Tokens in PowerShell. (F# #)
README
# jwtPS
The primary objective of this module is to generate a JSON Web Token. You can find more information about JWT on the [official website](https://jwt.io).
## Prerequisite
The new module version doesn't use OpenSSL anymore for the creation or validation of the JWT, instead it uses the internal library *System.Security.Cryptography*.
[OpenSSL](https://www.openssl.org) can still be used to generate the private/public key pair to create RSA or ECDsa tokens. To install OpenSSL for PowerShell you can follow this [link](https://adamtheautomator.com/install-openssl-powershell/). Alternatively, OpenSSL is included in Git. If you have Git installed, you can open 'Git Bash' and run `openssl` there.
To test whether OpenSSL is installed and available in your PowerShell terminal, please enter:
```PowerShell
PS > openssl version
OpenSSL 1.1.1 11 Sep 2018
```
The command should return the current version of OpenSSL.
## Introduction
You can easily install jwtPS from the PSGallery and import the module.
```PowerShell
Install-Module -Name jwtPS
Import-Module -Name jwtPS
```
Once installed and imported, you have two commands at your disposal. With `New-JWT` you create a new JSON Web Token and `ConvertFrom-JWT` is a function which returns the human-readable content of the provided JWT. It returns the content of the header as well as the payload.
## Create a JWT
To create a JWT you need three things:
1. You need to have the path of your private key
2. You need to provide the payload as a hashtable
3. You need to select the algorithm.
The algorithm in the new version is a bit cumbersome to set up. The algorithm consists out of two discriminating unions. `encryption` sets the encryption level of the algorithm and `algorithm` sets up the algorithm. Finally, both types make up `cryptographyType`. The classes written in F# look like that:
```fsharp
type encryption = SHA256 | SHA384 | SHA512
type algorithm =
| HMAC of encryption
| RSA of encryption
| ECDsa of encryption
| PSS of encryption
type cryptographyType =
{
Algorithm: algorithm
Encryption: encryption
}
```
To create this class in PowerShell you need to cast them like this:
```PowerShell
$encryption = [jwtTypes+encryption]::SHA256
$algorithm = [jwtTypes+algorithm]::HMAC
$alg = [jwtTypes+cryptographyType]::new($algorithm, $encryption)
```
Finally, you can see below the code to create a JWT using RSA encryption with SHA384.
```PowerShell
$key = "C:\Users\Path\To\Private\Key.pem"
# The content must be joined otherwise you would have a string array.
$keyContent = (Get-Content -Path $key) -join ""
$payload = @{
aud = "jwtPS"
iss = "DigitalAXPP-$(Get-Random -Maximum 10000)"
sub = "RS384 Test"
nbf = "0"
exp = ([System.DateTimeOffset]::Now.AddHours(3)).ToUnixTimeSeconds()
iat = ([System.DateTimeOffset]::Now).ToUnixTimeSeconds()
jti = [guid]::NewGuid()
}
$encryption = [jwtTypes+encryption]::SHA384
$algorithm = [jwtTypes+algorithm]::RSA
$alg = [jwtTypes+cryptographyType]::new($algorithm, $encryption)
$jwt = New-JWT -Payload $payload -Algorithm $alg -FilePath $key
$jwt = New-JWT -Payload $payload -Algorithm $alg -Secret $keyContent
```
**Attention**, `New-Jwt` accepts the secret now either in **PEM** or **PKCS#8** format.
> [!IMPORTANT]
> You can use now the `Header` property to provide a hashtable with custom keys for your JWT header.
> The hashtable you provide is accepted **as-is**. The function searches for `alg` and `typ`.
> If the keys are included in your hashtable, the values will not be overriden. If they are missing,
> `alg` will be added with the value from your `alg.Id` and `typ` gets added with `JWT`.
> Nevertheless, _the content will be encrypted with the algorithm you set in `-Algorithm`_!