(PowerShell) Create JWT Using HS256, HS384, or HS512

Demonstrates how to create a JWT using HS256, HS384, or HS512. (HS256 is JWT's acronym for HMAC-SHA256.) When HMAC is used, the secret is a shared secret (i.e. password) that both client and server know beforehand.

This example also demonstrates how to include time constraints:

• nbf: Not Before Time
• exp: Expiration Time
• iat: Issue At Time

Chilkat .NET Downloads Chilkat .NET Assemblies

Add-Type -Path "C:\chilkat\ChilkatDotNet47-9.5.0-x64\ChilkatDotNet47.dll"

# Demonstrates how to create an HMAC JWT using a shared secret (password).

# This example requires the Chilkat API to have been previously unlocked.
# See Global Unlock Sample for sample code.

$jwt = New-Object Chilkat.Jwt

# Build the JOSE header
$jose = New-Object Chilkat.JsonObject
# Use HS256.  Pass the string "HS384" or "HS512" to use a different algorithm.
$success = $jose.AppendString("alg","HS256")
$success = $jose.AppendString("typ","JWT")

# Now build the JWT claims (also known as the payload)
$claims = New-Object Chilkat.JsonObject
$success = $claims.AppendString("iss","http://example.org")
$success = $claims.AppendString("sub","John")
$success = $claims.AppendString("aud","http://example.com")

# Set the timestamp of when the JWT was created to now.
$curDateTime = $jwt.GenNumericDate(0)
$success = $claims.AddIntAt(-1,"iat",$curDateTime)

# Set the "not process before" timestamp to now.
$success = $claims.AddIntAt(-1,"nbf",$curDateTime)

# Set the timestamp defining an expiration time (end time) for the token
# to be now + 1 hour (3600 seconds)
$success = $claims.AddIntAt(-1,"exp",$curDateTime + 3600)

# Produce the smallest possible JWT:
$jwt.AutoCompact = $true

$strJwt = $jwt.CreateJwt($jose.Emit(),$claims.Emit(),"secret")

$($strJwt)