(IOS) POP3 Read S/MIME Encrypted Email

Read S/MIME encrypted email.

Download: Chilkat IOS (IPhone) Objective-C Libraries

NSMutableString *strOutput = [NSMutableString stringWithCapacity:1000];

//  The mailman object is used for receiving (POP3)
//  and sending (SMTP) email.
CkoMailMan *mailman = [[[CkoMailMan alloc] init] autorelease];

//  Any string argument automatically begins the 30-day trial.
BOOL success;
success = [mailman UnlockComponent: @"30-day trial"];
if (success != YES) {
    [strOutput appendString: mailman.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

//  Set the POP3 server's hostname
mailman.MailHost = @"mail.chilkatsoft.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: @"/pfxFiles/certs_and_keys_1.pfx" password: @"pfxPassword1"];
if (success != YES) {
    [strOutput appendString: mailman.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    return;
}

success = [mailman AddPfxSourceFile: @"/pfxFiles/certs_and_keys_2.pfx" password: @"pfxPassword2"];
if (success != YES) {
    [strOutput appendString: mailman.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    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).

CkoEmailBundle *bundle;
//  Copy the all email from the user's POP3 mailbox
//  into a bundle object.  The email remains on the server.
bundle = [mailman CopyMail];
if (bundle == nil ) {
    [strOutput appendString: mailman.LastErrorText];
    [strOutput appendString: @"\n"];
    self.mainTextField.stringValue = strOutput;
    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,
int i;
for (i = 0; i <= [bundle.MessageCount intValue] - 1; i++) {
    CkoEmail *email;
    email = [bundle GetEmail: [NSNumber numberWithInt: i]];

    [strOutput appendString: email.From];
    [strOutput appendString: @"\n"];
    [strOutput appendString: email.Subject];
    [strOutput appendString: @"\n"];

    //  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 == YES) {

        [strOutput appendString: @"This email was encrypted when received."];
        [strOutput appendString: @"\n"];
        if (email.Decrypted == YES) {
            [strOutput appendString: @"This email was successfully decrypted.  It was encrypted by:"];
            [strOutput appendString: @"\n"];
            [strOutput appendString: email.EncryptedBy];
            [strOutput appendString: @"\n"];
        }
        else {
            [strOutput appendString: @"This email was not decrypted."];
            [strOutput appendString: @"\n"];
        }

    }

    if (email.ReceivedSigned == YES) {

        [strOutput appendString: @"This email was signed when received."];
        [strOutput appendString: @"\n"];
        if (email.SignaturesValid == YES) {
            [strOutput appendString: @"The signature was verified.  It was signed by:"];
            [strOutput appendString: @"\n"];
            [strOutput appendString: email.SignedBy];
            [strOutput appendString: @"\n"];
        }
        else {
            [strOutput appendString: @"The signature verification failed."];
            [strOutput appendString: @"\n"];
        }

    }

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

    [strOutput appendString: @"--"];
    [strOutput appendString: @"\n"];

}



self.mainTextField.stringValue = strOutput;