VBScript

Add a Detached Signature (Header Placement Control)

Demonstrates the Chilkat Mime.AddDetachedSignature2 method, which creates the same multipart/signed structure as AddDetachedSignature, with a second argument controlling whether the existing message header fields are transferred to the new outer entity.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: Signing wraps the content in a new outer multipart/signed, which raises the question of where the message-level headers (Subject, From, To) should live. This variant lets you choose: transfer them up to the outer entity so the signed message looks like a normal email, or leave them on the inner part. Transferring is typical for email; the finer control matters when the signed entity is embedded in a larger structure.

Chilkat VBScript Downloads

Download Chilkat for VBScript

VBScript

Dim fso, outFile
Set fso = CreateObject("Scripting.FileSystemObject")
'Create a Unicode (utf-16) output text file.
Set outFile = fso.CreateTextFile("output.txt", True, True)

success = 0

set mime = CreateObject("Chilkat.Mime")
success = mime.SetBodyFromPlainText("This message will be signed.")
If (success = 0) Then
    outFile.WriteLine(mime.LastErrorText)
    WScript.Quit
End If

'  Load the signing certificate (which must have access to its private key) from a PFX file.
'  The PFX password should come from a secure source rather than being hard-coded.
pfxPassword = "myPfxPassword"
set cert = CreateObject("Chilkat.Cert")
success = cert.LoadPfxFile("qa_data/signer.pfx",pfxPassword)
If (success = 0) Then
    outFile.WriteLine(cert.LastErrorText)
    WScript.Quit
End If

'  AddDetachedSignature2 is the same as AddDetachedSignature, but the 2nd argument controls whether
'  the existing message header fields are transferred to the new outer multipart/signed entity.
transferHeaderFields = 1
success = mime.AddDetachedSignature2(cert,transferHeaderFields)
If (success = 0) Then
    outFile.WriteLine(mime.LastErrorText)
    WScript.Quit
End If

success = mime.SaveMime("qa_output/signed.eml")
If (success = 0) Then
    outFile.WriteLine(mime.LastErrorText)
    WScript.Quit
End If

outFile.WriteLine("Detached signature added (headers transferred).")

outFile.Close