(Xojo Plugin) Send Signed Email using PFX File (long version)

Demonstrates how to send a signed email using a digital certificate w/ private key stored in a PFX file.

Chilkat Xojo Plugin Download Xojo Plugin for Windows, Linux, Mac OS X, and ARM, ARM64

// This example requires the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

// The mailman object is used for sending and receiving email.
Dim mailman As New Chilkat.MailMan

// Set the SMTP server.
mailman.SmtpHost = "smtp.mymailserver.com"

// Create a new email object
Dim email As New Chilkat.Email

email.Subject = "This email is signed"
email.Body = "This is a digitally signed mail"
email.From = "Chilkat Admin <admin@chilkatsoft.com>"
Dim success As Boolean
success = email.AddTo("Chilkat Support","support@chilkatsoft.com")

// Indicate that the email should be sent signed.
email.SendSigned = True

// Load a PFX file into a certificate store object.
// Then locate the certificate matching the  sender's email address,
// and use it for signing.
// (a PFX file may contain more than one certificate.)
Dim certStore As New Chilkat.CertStore
// The 1st argument is the path of the PFX file, the 2nd arg is the 
// PFX file's password:
success = certStore.LoadPfxFile("/pfx_files/chilkatsoft_secret.pfx","secret")
If (success <> True) Then
    System.DebugLog(certStore.LastErrorText)
    Return
End If

Dim cert As Chilkat.Cert
cert = certStore.FindCertBySubjectE("admin@chilkatsoft.com")
If (certStore.LastMethodSuccess = False) Then
    System.DebugLog(certStore.LastErrorText)
    Return
End If

// Alternatively, if a PFX file is known to contain a single certificate,
// you may load it directly into a Chilkat certificate object.
// This snippet of source code shows how:
Dim cert2 As New Chilkat.Cert
// The 1st argument is the filename, the 2nd arg is the 
// PFX file's password:
success = cert2.LoadPfxFile("/pfx_files/chilkatsoft_secret.pfx","secret")
If (success <> True) Then
    System.DebugLog(cert2.LastErrorText)

    Return
End If

// This example will use the cert from the certStore...
success = email.SetSigningCert(cert)

// Signed email can be sent in two different ways.  
// In a multipart/signed email, the signature is attached as a separate MIME part.
// In an opaque email (signedData) the content of the email is encapsulated within the signature
// and the email is sent as "application/pkcs7-mime". 
// Either should be fine, but some receiving systems might require one or the other..
mailman.OpaqueSigning = False

// Send a signed email.
success = mailman.SendEmail(email)
If (success <> True) Then
    System.DebugLog(mailman.LastErrorText)
Else
    // The LastErrorText property provides information
    // even when successful.
    System.DebugLog(mailman.LastErrorText)
    System.DebugLog("Mail Sent!")
End If