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 Boolean
success = False

Dim jws As New Chilkat.Jws

//  Protected header specifying RSASSA-PKCS1-v1_5 with SHA-256 (RS256).
Dim header As New Chilkat.JsonObject
success = header.UpdateString("alg","RS256")
success = jws.SetProtectedHeader(0,header)
If (success = False) Then
    System.DebugLog(jws.LastErrorText)
    Return
End If

Dim bIncludeBom As Boolean
bIncludeBom = False
success = jws.SetPayload("This is the content to sign.","utf-8",bIncludeBom)
If (success = False) Then
    System.DebugLog(jws.LastErrorText)
    Return
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 Chilkat.PrivateKey
success = privKey.LoadPemFile("qa_data/signer_privkey.pem")
If (success = False) Then
    System.DebugLog(privKey.LastErrorText)
    Return
End If

success = jws.SetPrivateKey(0,privKey)
If (success = False) Then
    System.DebugLog(jws.LastErrorText)
    Return
End If

Dim jwsCompact As String
jwsCompact = jws.CreateJws()
If (jws.LastMethodSuccess = False) Then
    System.DebugLog(jws.LastErrorText)
    Return
End If

System.DebugLog(jwsCompact)