(VB.NET) Create JWT using a Certificate's Private Key

See more JSON Web Token (JWT) Examples

Demonstrates how to create a JWT using a certificate's private key.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

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

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

Dim cert As New Chilkat.Cert

' Load an ECC private key from a PEM file.
Dim success As Boolean = cert.LoadPfxFile("c:/temp/myPfx.pfx","pfxPassword")
If (success <> True) Then
    Debug.WriteLine(cert.LastErrorText)
    Exit Sub
End If


Dim jwt As New Chilkat.Jwt

' Build the JOSE header
Dim jose As New Chilkat.JsonObject
' Note: The IsEcdsa function was added in Chilkat v10.1.0
If (cert.IsEcdsa() = True) Then
    ' Use ES256.  Pass the string "ES384" or "ES512" to use ECC with SHA-384 or SHA-512.
    jose.AppendString("alg","ES256")
Else
    ' Probably RSA...
    ' Use RS256.  Pass the string "RS384" or "RS512" to use RSA with SHA-384 or SHA-512.
    jose.AppendString("alg","RS256")
End If


jose.AppendString("typ","JWT")

' Now build the JWT claims (also known as the payload)
Dim claims As New Chilkat.JsonObject
claims.AppendString("iss","http://example.org")
claims.AppendString("sub","John")
claims.AppendString("aud","http://example.com")

' Set the timestamp of when the JWT was created to now.
Dim curDateTime As Integer = jwt.GenNumericDate(0)
claims.AddIntAt(-1,"iat",curDateTime)

' Set the "not process before" timestamp to now.
claims.AddIntAt(-1,"nbf",curDateTime)

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

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

' Create the JWT token.
Dim token As String = jwt.CreateJwtCert(jose.Emit(),claims.Emit(),cert)

Debug.WriteLine(token)

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