PureBasic

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. PureBasic

IncludeFile "CkCertStore.pb"
IncludeFile "CkCert.pb"
IncludeFile "CkJsonObject.pb"
IncludeFile "CkEmail.pb"
IncludeFile "CkMailMan.pb"

Procedure ChilkatExample()

    success.i = 0

    ; 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 = CkEmail::ckAddTo(email,"Chilkat Support","support@chilkatsoft.com")

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

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

    ; The 1st argument is the path of the PFX file, the 2nd arg is the 
    ; PFX file's password:
    success = CkCertStore::ckLoadPfxFile(certStore,"/pfx_files/chilkatsoft_secret.pfx","secret")
    If success <> 1
        Debug CkCertStore::ckLastErrorText(certStore)
        CkMailMan::ckDispose(mailman)
        CkEmail::ckDispose(email)
        CkCertStore::ckDispose(certStore)
        ProcedureReturn
    EndIf

    ; Find the certificate for the email address:
    jsonE.i = CkJsonObject::ckCreate()
    If jsonE.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckUpdateString(jsonE,"email","admin@chilkatsoft.com")

    cert.i = CkCert::ckCreate()
    If cert.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    success = CkCertStore::ckFindCert(certStore,jsonE,cert)
    If success = 0
        Debug CkCertStore::ckLastErrorText(certStore)
        CkMailMan::ckDispose(mailman)
        CkEmail::ckDispose(email)
        CkCertStore::ckDispose(certStore)
        CkJsonObject::ckDispose(jsonE)
        CkCert::ckDispose(cert)
        ProcedureReturn
    EndIf

    ; 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:
    cert2.i = CkCert::ckCreate()
    If cert2.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    ; The 1st argument is the filename, the 2nd arg is the 
    ; PFX file's password:
    success = CkCert::ckLoadPfxFile(cert2,"/pfx_files/chilkatsoft_secret.pfx","secret")
    If success <> 1
        Debug CkCert::ckLastErrorText(cert2)
        CkMailMan::ckDispose(mailman)
        CkEmail::ckDispose(email)
        CkCertStore::ckDispose(certStore)
        CkJsonObject::ckDispose(jsonE)
        CkCert::ckDispose(cert)
        CkCert::ckDispose(cert2)
        ProcedureReturn
    EndIf

    ; This example will use the cert from the certStore...
    success = CkEmail::ckSetSigningCert(email,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..
    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)
    CkCertStore::ckDispose(certStore)
    CkJsonObject::ckDispose(jsonE)
    CkCert::ckDispose(cert)
    CkCert::ckDispose(cert2)


    ProcedureReturn
EndProcedure