(PureBasic) POP3 Verify Signed (S/MIME) Email

Demonstrates how to download and verify digitally signed S/MIME email.

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkCert.pb"
IncludeFile "CkMailMan.pb"
IncludeFile "CkEmail.pb"
IncludeFile "CkStringArray.pb"

Procedure ChilkatExample()

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

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

    success.i

    ; Set the POP3 server's hostname
    CkMailMan::setCkMailHost(mailman, "pop.someMailServer.com")

    ; Set the POP3 login/password.
    CkMailMan::setCkPopUsername(mailman, "myLogin")
    CkMailMan::setCkPopPassword(mailman, "myPassword")

    sa.i = CkMailMan::ckGetUidls(mailman)
    If CkMailMan::ckLastMethodSuccess(mailman) = 0
        Debug CkMailMan::ckLastErrorText(mailman)
        CkMailMan::ckDispose(mailman)
        ProcedureReturn
    EndIf

    email.i
    uidl.s

    i.i = 0
    While i < CkStringArray::ckCount(sa)

        uidl = CkStringArray::ckGetString(sa,i)

        email = CkMailMan::ckFetchEmail(mailman,uidl)
        If CkMailMan::ckLastMethodSuccess(mailman) = 0
            Debug CkMailMan::ckLastErrorText(mailman)
            CkStringArray::ckDispose(sa)

            CkMailMan::ckDispose(mailman)
            ProcedureReturn
        EndIf

        Debug CkEmail::ckFrom(email)
        Debug CkEmail::ckSubject(email)

        ; The security layers of signed and/or encrypted emails
        ; are automatically "unwrapped" when loaded into
        ; a Chilkat email object.
        ; An application only needs to check to see if an email
        ; was received signed or encrypted, and then examine
        ; the success/failure.  For example:
        If CkEmail::ckReceivedSigned(email) = 1

            Debug "This email was signed."

            ; Check to see if the signatures were verified.
            If CkEmail::ckSignaturesValid(email) = 1
                Debug "Digital signature(s) verified."
                Debug "Signer: " + CkEmail::ckSignedBy(email)

                ; The certificate used for signing may be obtained
                ; by calling email.GetSignedByCert.
                cert.i
                cert = CkEmail::ckGetSignedByCert(email)
                If CkEmail::ckLastMethodSuccess(email) = 0
                    Debug "Failed to get signing certificate object."
                Else
                    Debug "Signing cert: " + CkCert::ckSubjectCN(cert)
                    CkCert::ckDispose(cert)

                EndIf

            Else
                Debug "Digital signature verification failed."
            EndIf

        EndIf

        CkEmail::ckDispose(email)

        i = i + 1
    Wend

    CkStringArray::ckDispose(sa)

    CkMailMan::ckPop3EndSession(mailman)


    CkMailMan::ckDispose(mailman)


    ProcedureReturn
EndProcedure