Visual Basic 6.0 Requires Chilkat v11.0.0+

ABN AMRO Create Signed JSON Web Token

See more ABN AMRO Examples

Demonstrates how to create a signed JWT to be used for authenticating requests to the ABN AMRO REST API's. Visual Basic 6.0

Dim success As Long
success = 0

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

'  Create public/private key pair (RSA)
Dim rsa As New ChilkatRsa

'  Generate a 2048-bit key.
Dim privkey As New PrivateKey
success = rsa.GenKey(2048,privkey)
If (success = 0) Then
    Debug.Print rsa.LastErrorText
    Exit Sub
End If

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

Dim pubkey As New PublicKey
success = privkey.ToPublicKey(pubkey)
success = pubkey.SavePemFile(1,"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.
Dim jwt As New ChilkatJwt

'  Create the header:
'  {
'      "typ": "JWT",
'      "alg": "RS256"
'  }
Dim jsonHeader As New ChilkatJsonObject
success = jsonHeader.UpdateString("typ","JWT")
success = jsonHeader.UpdateString("alg","RS256")

'  Create the payload:
'  {
'      "nbf": 1499947668,
'      "exp": 1499948668,
'      "iss": "me",
'      "sub": "anApiKey",
'      "aud": "https://auth-sandbox.abnamro.com/oauth/token"
'  }
Dim jsonPayload As New ChilkatJsonObject

Dim curDateTime As Long
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)

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

'  Produce the smallest possible JWT:
jwt.AutoCompact = 1

Dim jwtStr As String
jwtStr = jwt.CreateJwtPk(jsonHeader.Emit(),jsonPayload.Emit(),privkey)
If (jwt.LastMethodSuccess = 0) Then
    Debug.Print jwt.LastErrorText
    Exit Sub
End If

'  Here is the JWT:
Debug.Print jwtStr