(PowerShell) ABN AMRO Create Signed JSON Web Token

Demonstrates how to create a signed JWT to be used for authenticating requests to the ABN AMRO REST API's.

For more information, see https://developer.abnamro.com/get-started#headingFive

Chilkat .NET Downloads Chilkat .NET Assemblies

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

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

# Create public/private key pair (RSA)
$rsa = New-Object Chilkat.Rsa

# Generate a 2048-bit key.
$success = $rsa.GenerateKey(2048)
if ($success -ne $true) {
    $($rsa.LastErrorText)
    exit
}

# Export the key to PEM files.
# Write one PEM file for the private key, and one for the public key.
$privkey = $rsa.ExportPrivateKeyObj()
$success = $privkey.SavePemFile("qa_data/pem/abnAmroPrivateKey.pem")

$pubkey = $rsa.ExportPublicKeyObj()
$success = $pubkey.SavePemFile($true,"qa_data/pem/abnAmroPublicKey.pem")
# Note: Please share your public key along with your app name and developer email id at api.support@nl.abnamro.com. 
# Token generation will not work unless public key is associated with your app.

# Create the JWT.
$jwt = New-Object Chilkat.Jwt

# Create the header:
# {
#     "typ": "JWT",
#     "alg": "RS256"
# }
$jsonHeader = New-Object Chilkat.JsonObject
$jsonHeader.UpdateString("typ","JWT")
$jsonHeader.UpdateString("alg","RS256")

# Create the payload:
# {
#     "nbf": 1499947668,
#     "exp": 1499948668,
#     "iss": "me",
#     "sub": "anApiKey",
#     "aud": "https://auth-sandbox.abnamro.com/oauth/token"
# }
$jsonPayload = New-Object Chilkat.JsonObject

$curDateTime = $jwt.GenNumericDate(0)

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

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

$jsonPayload.UpdateString("iss","me")
$jsonPayload.UpdateString("sub","anApiKey")
$jsonPayload.UpdateString("aud","https://auth-sandbox.abnamro.com/oauth/token")

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

$jwtStr = $jwt.CreateJwtPk($jsonHeader.Emit(),$jsonPayload.Emit(),$privkey)
if ($jwt.LastMethodSuccess -ne $true) {
    $($jwt.LastErrorText)
    exit
}

# Here is the JWT:
$($jwtStr)