(Lianja) IMAP Download and Verify Signed (S/MIME) Email

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

Chilkat Lianja Extension Download Chilkat Lianja Extension

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

loImap = createobject("CkImap")

// Connect to an IMAP server.
// Use TLS
loImap.Ssl = .T.
loImap.Port = 993
llSuccess = loImap.Connect("imap.someMailServer.com")
if (llSuccess <> .T.) then
    ? loImap.LastErrorText
    release loImap
    return
endif

llSuccess = loImap.Login("myLogin","myPassword")
if (llSuccess <> .T.) then
    ? loImap.LastErrorText
    release loImap
    return
endif

// Select an IMAP mailbox
llSuccess = loImap.SelectMailbox("Inbox")
if (llSuccess <> .T.) then
    ? loImap.LastErrorText
    release loImap
    return
endif

// We can choose to fetch UIDs or sequence numbers.
llFetchUids = .T.

// Get the message IDs of all the emails in the mailbox
loMessageSet = loImap.Search("ALL",llFetchUids)
if (loImap.LastMethodSuccess <> .T.) then
    ? loImap.LastErrorText
    release loImap
    return
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,.T.)

    // 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 = .T.) then

        ? "This email was signed."

        // Check to see if the signatures were verified.
        if (loEmail.SignaturesValid = .T.) 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 <> .T.) 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.
llSuccess = loImap.Disconnect()

release loMessageSet


release loImap