(VB.NET UWP/WinRT) Create JWT Using ECC (ES256, ES384, or ES512)

Demonstrates how to create a JWT using an ECC private key. This is for JOSE headers with an "alg" of ES256, ES384, or ES512. When ECC is used, the private key signs (creates) the JWT, and the public key is for verification.

This example also demonstrates how to include time constraints:

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

Chilkat Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

' Demonstrates how to create a JWT using an ECC private key.

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

Dim privKey As New Chilkat.PrivateKey

' Load an ECC private key from a PEM file.
Dim success As Boolean = privKey.LoadPemFile("qa_data/pem/ecc_privKey.pem")
If (success <> True) Then
    Debug.WriteLine(privKey.LastErrorText)
    Exit Sub
End If


Dim jwt As New Chilkat.Jwt

' Build the JOSE header
Dim jose As New Chilkat.JsonObject
' Use ES256.  Pass the string "ES384" or "ES512" to use ECC with SHA-384 or SHA-512.
success = jose.AppendString("alg","ES256")
success = jose.AppendString("typ","JWT")

' Now build the JWT claims (also known as the payload)
Dim claims As New 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.
Dim curDateTime As Integer = 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.
Dim token As String = jwt.CreateJwtPk(jose.Emit(),claims.Emit(),privKey)

Debug.WriteLine(token)

' Example output:
' eyJhbGciOiJFUzI1NiIsInR5cCI6IkpXVCJ9.eyJpc3MiOiJodHRwOi8vZXhhbXBsZS5vcmciLCJzdWIiOiJKb2huIiwiYXVkIjoiaHR0cDovL2V4YW1wbGUuY29tIiwiaWF0IjoxNDg1NzA4NzkyLCJuYmYiOjE0ODU3MDg3OTIsImV4cCI6MTQ4NTcxMjM5Mn0.wqsuyJpxJ073ox-lOiLFqG1lQocXe4hGf2XGZJRrO3qn0UusxI_bu3Gzky8gBsH4sA4u9TWZn5M-1wYMMIJk6Q