(Objective-C) POP3 Verify Signed (S/MIME) Email

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

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#import <CkoMailMan.h>
#import <CkoStringArray.h>
#import <CkoEmail.h>
#import <NSString.h>
#import <CkoCert.h>

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

CkoMailMan *mailman = [[CkoMailMan alloc] init];
BOOL success;

// Set the POP3 server's hostname
mailman.MailHost = @"pop.someMailServer.com";

// Set the POP3 login/password.
mailman.PopUsername = @"myLogin";
mailman.PopPassword = @"myPassword";

CkoStringArray *sa = [mailman GetUidls];
if (mailman.LastMethodSuccess == NO) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

CkoEmail *email = 0;
NSString *uidl = 0;

int i = 0;
while (i < [sa.Count intValue]) {

    uidl = [sa GetString: [NSNumber numberWithInt: i]];

    email = [mailman FetchEmail: uidl];
    if (mailman.LastMethodSuccess == NO) {
        NSLog(@"%@",mailman.LastErrorText);

        return;
    }

    NSLog(@"%@",email.From);
    NSLog(@"%@",email.Subject);

    // 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 (email.ReceivedSigned == YES) {

        NSLog(@"%@",@"This email was signed.");

        // Check to see if the signatures were verified.
        if (email.SignaturesValid == YES) {
            NSLog(@"%@",@"Digital signature(s) verified.");
            NSLog(@"%@%@",@"Signer: ",email.SignedBy);

            // The certificate used for signing may be obtained
            // by calling email.GetSignedByCert.
            CkoCert *cert = 0;
            cert = [email GetSignedByCert];
            if (email.LastMethodSuccess == NO) {
                NSLog(@"%@",@"Failed to get signing certificate object.");
            }
            else {
                NSLog(@"%@%@",@"Signing cert: ",cert.SubjectCN);

            }

        }
        else {
            NSLog(@"%@",@"Digital signature verification failed.");
        }

    }

    i = i + 1;
}

[mailman Pop3EndSession];