Swift Requires Chilkat v11.0.0+

POP3 Read S/MIME Encrypted Email

Read S/MIME encrypted email. Swift

func chilkatTest() {
    var success: Bool = false

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

    //  The mailman object is used for receiving (POP3) 
    //  and sending (SMTP) email.
    let mailman = CkoMailMan()!

    //  Set the POP3 server's hostname
    mailman.mailHost = "pop.example.com"

    //  Set the POP3 login/password.
    mailman.popUsername = "myLogin"
    mailman.popPassword = "myPassword"

    //  If running on Microsoft Windows, the Chilkat mailman
    //  will automatically search the registry-based certificate stores
    //  for matching certificates and private keys required for
    //  decryption.  However, on Linux, MAX OS X, and other
    //  operating systems, no such thing exists.  Therefore, you'll 
    //  need to specify one or more PFX (.p12 / .pfx) files as
    //  sources for locating the certs required for decyrption.
    success = mailman.addPfxSourceFile(pfxFilePath: "/pfxFiles/certs_and_keys_1.pfx", password: "pfxPassword1")
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }

    success = mailman.addPfxSourceFile(pfxFilePath: "/pfxFiles/certs_and_keys_2.pfx", password: "pfxPassword2")
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }

    //  ...
    //  Note: On MS Windows, it is not required to provide PFX sources
    //  if the needed certs and private keys are already installed
    //  on the system (in the registry-based certificate stores).

    //  Copy the all email from the user's POP3 mailbox 
    //  into a bundle object.  The email remains on the server.
    let bundle = CkoEmailBundle()!
    var keepOnServer: Bool = true
    var headersOnly: Bool = false
    //  Irrelevent because we are NOT downloading headers-only
    var numBodyLines: Int = 0
    success = mailman.fetchAll(keepOnServer: keepOnServer, headersOnly: headersOnly, numBodyLines: numBodyLines, bundle: bundle)
    if success == false {
        print("\(mailman.lastErrorText!)")
        return
    }

    //  S/MIME security envelopes are automatically "unwrapped" 
    //  when a message is retrieved from the server. Signed emails are automatically verified, and 
    //  encrypted emails are automatically decrypted, restoring the email to the original state before 
    //  signing and/or encrypting. Information about the signing and encrypting certificates can be 
    //  retrieved from the Email object (methods: GetSignedByCert, GetEncryptedByCert; 
    //  properties: SignedBy, EncryptedBy, SignaturesValid, Decrypted, ReceivedSigned, 
    //  ReceivedEncrypted).

    //  Loop over the bundle
    let email = CkoEmail()!
    var i: Int = 0
    while i < bundle.messageCount.intValue {

        bundle.email(at: i, email: email)

        print("\(email.from!)")
        print("\(email.subject!)")

        //  At this point, if the email was signed and/or encrypted, it is already "unwrapped", i.e.
        //  the email is already decrypted and in a state as if it were never signed or encrypted.
        //  You may check to see if the email was received encrypted or signed, and if so,
        //  whether it was successfully unwrapped and who signed or encrypted it:
        if email.receivedEncrypted == true {

            print("This email was encrypted when received.")
            if email.decrypted == true {
                print("This email was successfully decrypted.  It was encrypted by:")
                print("\(email.encryptedBy!)")
            }
            else {
                print("This email was not decrypted.")
            }

        }

        if email.receivedSigned == true {

            print("This email was signed when received.")
            if email.signaturesValid == true {
                print("The signature was verified.  It was signed by:")
                print("\(email.signedBy!)")
            }
            else {
                print("The signature verification failed.")
            }

        }

        //  The email's body, HTML body, attachments, etc.
        //  are decrypted and available just like any non-encrypted email.

        print("--")

        i = i + 1
    }


}