Sign a JWS with a Private Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetPrivateKey, which sets the private key used to create a signature. The example uses RS256 (RSASSA-PKCS1-v1_5 with SHA-256).

The file path is relative to the application's current working directory. An absolute path may also be used. Supply the path appropriate to your own environment.

Dim success As Long
success = 0

Dim jws As New ChilkatJws

'  Protected header specifying RSASSA-PKCS1-v1_5 with SHA-256 (RS256).
Dim header As New ChilkatJsonObject
success = header.UpdateString("alg","RS256")
success = jws.SetProtectedHeader(0,header)
If (success = 0) Then
    Debug.Print jws.LastErrorText
    Exit Sub
End If

Dim bIncludeBom As Long
bIncludeBom = 0
success = jws.SetPayload("This is the content to sign.","utf-8",bIncludeBom)
If (success = 0) Then
    Debug.Print jws.LastErrorText
    Exit Sub
End If

'  The file path is relative to the application's current working directory.  An absolute path
'  may also be used.  Supply the path appropriate to your own environment.
'  Load the signer's private key and set it for signature 0.
Dim privKey As New PrivateKey
success = privKey.LoadPemFile("qa_data/signer_privkey.pem")
If (success = 0) Then
    Debug.Print privKey.LastErrorText
    Exit Sub
End If

success = jws.SetPrivateKey(0,privKey)
If (success = 0) Then
    Debug.Print jws.LastErrorText
    Exit Sub
End If

Dim jwsCompact As String
jwsCompact = jws.CreateJws()
If (jws.LastMethodSuccess = 0) Then
    Debug.Print jws.LastErrorText
    Exit Sub
End If

Debug.Print jwsCompact