Sign a JWS with a Certificate

See more JSON Web Signatures (JWS) Examples

Demonstrates Jws.SetSigningCert, which sets the certificate whose associated private key is used to create a signature.

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 = False

Dim jws As ChilkatJws
jws.Initialize

'  Protected header specifying RSASSA-PKCS1-v1_5 with SHA-256 (RS256).
Dim header As ChilkatJsonObject
header.Initialize
header.UpdateString("alg", "RS256")
success = jws.SetProtectedHeader(0, header)
If success = False Then
    Log(jws.LastErrorText)
    Return
End If


Dim bIncludeBom As Boolean = False
success = jws.SetPayload("This is the content to sign.", "utf-8", bIncludeBom)
If success = False Then
    Log(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.
'  The PFX password should come from a secure source rather than being hard-coded.
Dim pfxPassword As String = "myPfxPassword"

'  Load a certificate that has an associated private key, then set it as the signing certificate for
'  signature 0.  The certificate's private key is used to create the signature.
Dim cert As ChilkatCert
cert.Initialize("cert")
success = cert.LoadPfxFile("qa_data/signer.pfx", pfxPassword)
If success = False Then
    Log(cert.LastErrorText)
    Return
End If

success = jws.SetSigningCert(0, cert)
If success = False Then
    Log(jws.LastErrorText)
    Return
End If


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

Log(jwsCompact)