(PureBasic) 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.

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkEmail.pb"
IncludeFile "CkMailMan.pb"

Procedure ChilkatExample()

    ; 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.
    mailman.i = CkMailMan::ckCreate()
    If mailman.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; Set the SMTP server.
    CkMailMan::setCkSmtpHost(mailman, "smtp.mymailserver.com")

    ; Create a new email object
    email.i = CkEmail::ckCreate()
    If email.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkEmail::setCkSubject(email, "This email is signed")
    CkEmail::setCkBody(email, "This is a digitally signed mail")
    CkEmail::setCkFrom(email, "Chilkat Admin <admin@chilkatsoft.com>")
    success.i = CkEmail::ckAddTo(email,"Chilkat Support","support@chilkatsoft.com")

    ; Indicate that the email should be sent signed.
    CkEmail::setCkSendSigned(email, 1)

    ; 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 = CkMailMan::ckAddPfxSourceFile(mailman,"/pfx_files/chilkatsoft_secret.pfx","secret")
    If success <> 1
        Debug CkMailMan::ckLastErrorText(mailman)
        CkMailMan::ckDispose(mailman)
        CkEmail::ckDispose(email)
        ProcedureReturn
    EndIf

    ; 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..
    CkMailMan::setCkOpaqueSigning(mailman, 0)

    ; Send a signed email.
    success = CkMailMan::ckSendEmail(mailman,email)
    If success <> 1
        Debug CkMailMan::ckLastErrorText(mailman)
    Else
        ; The LastErrorText property provides information
        ; even when successful.
        Debug CkMailMan::ckLastErrorText(mailman)
        Debug "Mail Sent!"
    EndIf



    CkMailMan::ckDispose(mailman)
    CkEmail::ckDispose(email)


    ProcedureReturn
EndProcedure