(PowerShell) Create JWT using a Brainpool EC Key

See more JSON Web Token (JWT) Examples

Demonstrates how to create a JWT using an EC private key. This is for JOSE headers having an "alg" member with any of the following values:

• BP160R1
• BP192R1
• BP224R1
• BP256R1
• BP320R1
• BP384R1
• BP512R1

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 a JWT using a brainpool EC private key.

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

$privKey = New-Object Chilkat.PrivateKey

# Load a brainpool EC key.
$success = $privKey.LoadPemFile("c:/qa_data/pem/ec_brainpool_privKey.pem")
if ($success -ne $true) {
    $($privKey.LastErrorText)
    exit
}

# You can examine the curve name of the key you just loaded by getting the private in XML format:
# <ECCKeyValue curve="CURVE_NAME">...</ECCKeyValue>
$($privKey.GetXml())

$jwt = New-Object Chilkat.Jwt

# Build the JOSE header
$jose = New-Object Chilkat.JsonObject
# Use the brainpool curve name matching the private key you just loaded.
# Use "BP256R1", or "BP384R1", etc.   
$success = $jose.AppendString("alg","BP256R1")
$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

# Create the JWT token.  This is where the ECC signature is created.
$token = $jwt.CreateJwtPk($jose.Emit(),$claims.Emit(),$privKey)

$($token)