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

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

Note: This example requires Chilkat v11.0.0 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoMailman
    Variant vStUidls
    Handle hoStUidls
    Variant vEmail
    Handle hoEmail
    Variant vCert
    Handle hoCert
    Integer iCount
    Integer i
    String sTemp1
    Boolean bTemp1

    Move False To iSuccess

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

    Get Create (RefClass(cComChilkatMailMan)) To hoMailman
    If (Not(IsComObjectCreated(hoMailman))) Begin
        Send CreateComObject of hoMailman
    End

    // Set the POP3 server's hostname
    Set ComMailHost Of hoMailman To "pop.example.com"

    // Set the POP3 login/password.
    Set ComPopUsername Of hoMailman To "myLogin"
    Set ComPopPassword Of hoMailman To "myPassword"

    Get Create (RefClass(cComChilkatStringTable)) To hoStUidls
    If (Not(IsComObjectCreated(hoStUidls))) Begin
        Send CreateComObject of hoStUidls
    End
    Get pvComObject of hoStUidls to vStUidls
    Get ComFetchUidls Of hoMailman vStUidls To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoMailman To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get Create (RefClass(cComChilkatEmail)) To hoEmail
    If (Not(IsComObjectCreated(hoEmail))) Begin
        Send CreateComObject of hoEmail
    End
    Get Create (RefClass(cComChilkatCert)) To hoCert
    If (Not(IsComObjectCreated(hoCert))) Begin
        Send CreateComObject of hoCert
    End

    Get ComCount Of hoStUidls To iCount
    Move 0 To i
    While (i < iCount)
        // Download the full email.
        Get ComStringAt Of hoStUidls i To sTemp1
        Get pvComObject of hoEmail to vEmail
        Get ComFetchByUidl Of hoMailman sTemp1 False 0 vEmail To iSuccess
        If (iSuccess = False) Begin
            Get ComLastErrorText Of hoMailman To sTemp1
            Showln sTemp1
            Procedure_Return
        End

        Showln i
        Get ComFrom Of hoEmail To sTemp1
        Showln "From: " sTemp1
        Get ComSubject Of hoEmail To sTemp1
        Showln "Subject: " sTemp1

        // 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:
        Get ComReceivedSigned Of hoEmail To bTemp1
        If (bTemp1 = True) Begin

            Showln "This email was signed."

            // Check to see if the signatures were verified.
            Get ComSignaturesValid Of hoEmail To bTemp1
            If (bTemp1 = True) Begin
                Showln "Digital signature(s) verified."
                Get ComSignedBy Of hoEmail To sTemp1
                Showln "Signer: " sTemp1

                Get pvComObject of hoCert to vCert
                Get ComLastSignerCert Of hoEmail 0 vCert To iSuccess
                If (iSuccess = False) Begin
                    Get ComLastErrorText Of hoEmail To sTemp1
                    Showln sTemp1
                    Procedure_Return
                End

                Get ComSubjectCN Of hoCert To sTemp1
                Showln "Signing cert: " sTemp1
            End

        End
        Else Begin
            Showln "Digital signature verification failed."
        End

        Move (i + 1) To i
    Loop

    Get ComPop3EndSession Of hoMailman To iSuccess


End_Procedure