Sign a JWS with an HMAC Key

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetMacKey, which sets the symmetric MAC key for a signature. The key bytes are supplied in a named encoding such as hex or base64.

Dim success As Boolean
success = False

Dim jws As New Chilkat.Jws

//  Protected header specifying HMAC-SHA256.
Dim header As New Chilkat.JsonObject
success = header.UpdateString("alg","HS256")
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

//  Set the symmetric MAC key for signature 0.  The key bytes are provided in the named encoding (here
//  base64).  In production, obtain the key from a secure source rather than hard-coding it.
Dim base64Key As String
base64Key = "YWJjZGVmZ2hpamtsbW5vcHFyc3R1dnd4eXowMTIzNDU="
success = jws.SetMacKey(0,base64Key,"base64")
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)