Xojo Plugin

Create a JWS into a StringBuilder

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.CreateJwsSb, which creates a JWS and writes it into a StringBuilder.

Background. JWS (JSON Web Signature) integrity-protects a payload with a signature or MAC. The header alg names the algorithm; this example uses HMAC-SHA256 (HS256) with a symmetric MAC key.

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Dim success As Boolean
success = False

Dim jws As New Chilkat.Jws

//  Set the protected header for signer 0, specifying the signature algorithm (alg).
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

//  Set the payload to be signed.
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

//  Provide the HMAC key (base64) for signer 0.  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

//  Create the JWS and write it into a StringBuilder.
Dim sbJws As New Chilkat.StringBuilder
success = jws.CreateJwsSb(sbJws)
If (success = False) Then
    System.DebugLog(jws.LastErrorText)
    Return
End If

System.DebugLog(sbJws.GetAsString())