B4X

Send Signed Email using PFX File

Demonstrates how to send a signed email using a digital certificate w/ private key stored in a PFX file. B4X

Dim success As Boolean = False

'  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 ChilkatMailMan
mailman.Initialize("mailman")

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

'  Create a new email object
Dim email As ChilkatEmail
email.Initialize

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

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

'  Tell the mailman to use a PFX file as a source for locating
'  the certificate and private key required for signing.
'  The certificate chosen for signing will be the one that
'  matches the sender's email address, which also has
'  a private key.  All intermediate certs in the chain of 
'  authentication, up to and including the root, will
'  be included in the signature.
success = mailman.AddPfxSourceFile("/pfx_files/chilkatsoft_secret.pfx", "secret")
If success <> True Then
    Log(mailman.LastErrorText)
    Return
End If


'  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
    Log(mailman.LastErrorText)
Else
    '  The LastErrorText property provides information
    '  even when successful.
    Log(mailman.LastErrorText)
    Log("Mail Sent!")
End If