(Visual FoxPro) IMAP Download and Verify Signed (S/MIME) Email

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

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

LOCAL loImap
LOCAL lnSuccess
LOCAL lnFetchUids
LOCAL loMessageSet
LOCAL i
LOCAL lcUid
LOCAL loEmail
LOCAL loCert

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

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Imap')
loImap = CreateObject('Chilkat.Imap')

* Connect to an IMAP server.
* Use TLS
loImap.Ssl = 1
loImap.Port = 993
lnSuccess = loImap.Connect("imap.someMailServer.com")
IF (lnSuccess <> 1) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    CANCEL
ENDIF

lnSuccess = loImap.Login("myLogin","myPassword")
IF (lnSuccess <> 1) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    CANCEL
ENDIF

* Select an IMAP mailbox
lnSuccess = loImap.SelectMailbox("Inbox")
IF (lnSuccess <> 1) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    CANCEL
ENDIF

* We can choose to fetch UIDs or sequence numbers.
lnFetchUids = 1

* Get the message IDs of all the emails in the mailbox
loMessageSet = loImap.Search("ALL",lnFetchUids)
IF (loImap.LastMethodSuccess <> 1) THEN
    ? loImap.LastErrorText
    RELEASE loImap
    CANCEL
ENDIF

* Scan for emails with attachments, and save the attachments
* to a sub-directory.
i = 0
DO WHILE i < loMessageSet.Count

    lcUid = loMessageSet.GetId(i)
    ? "uid: " + lcUid

    loEmail = loImap.FetchSingle(lcUid,1)

    * 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 (loEmail.ReceivedSigned = 1) THEN

        ? "This email was signed."

        * Check to see if the signatures were verified.
        IF (loEmail.SignaturesValid = 1) THEN
            ? "Digital signature(s) verified."

            ? "Signer: " + loEmail.SignedBy

            * The certificate used for signing may be obtained
            * by calling email.GetSignedByCert.
            loCert = loEmail.GetSignedByCert()
            IF (loEmail.LastMethodSuccess <> 1) THEN
                ? "Failed to get signing certificate object."
            ELSE
                ? "Signing cert: " + loCert.SubjectCN
                RELEASE loCert
            ENDIF

        ELSE
            ? "Digital signature verification failed."
        ENDIF

    ENDIF

    RELEASE loEmail

    i = i + 1
ENDDO

* Disconnect from the IMAP server.
lnSuccess = loImap.Disconnect()

RELEASE loMessageSet

RELEASE loImap