(Lianja) IMAP Download and 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.

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llSuccess = .F.

// 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.example.com")
if (llSuccess = .F.) then
    ? loImap.LastErrorText
    release loImap
    return
endif

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

// Select an IMAP mailbox
llSuccess = loImap.SelectMailbox("Inbox")
if (llSuccess = .F.) 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 = createobject("CkMessageSet")
llSuccess = loImap.QueryMbx("ALL",llFetchUids,loMessageSet)
if (llSuccess = .F.) then
    ? loImap.LastErrorText
    release loImap
    release loMessageSet
    return
endif

loEmail = createobject("CkEmail")
loCert = createobject("CkCert")

i = 0
do while i < loMessageSet.Count

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

    llSuccess = loImap.FetchEmail(.F.,lcUid,.T.,loEmail)
    if (llSuccess = .F.) then
        ? loImap.LastErrorText
        release loImap
        release loMessageSet
        release loEmail
        release loCert
        return
    endif

    // 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

            // Get the certificate used for signing.
            llSuccess = loEmail.LastSignerCert(0,loCert)

            if (llSuccess = .F.) then
                ? "Failed to get signing certificate object."
            else
                ? "Signing cert: " + loCert.SubjectCN
            endif

        else
            ? "Digital signature verification failed."
        endif

    endif

    i = i + 1
enddo

// Disconnect from the IMAP server.
llSuccess = loImap.Disconnect()


release loImap
release loMessageSet
release loEmail
release loCert