(Objective-C) POP3 Read S/MIME Encrypted Email

Read S/MIME encrypted email.

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#import <CkoMailMan.h>
#import <CkoEmailBundle.h>
#import <CkoEmail.h>

// 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.
CkoMailMan *mailman = [[CkoMailMan alloc] init];

// Set the POP3 server's hostname
mailman.MailHost = @"pop.someMailServer.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.
BOOL success = [mailman AddPfxSourceFile: @"/pfxFiles/certs_and_keys_1.pfx" password: @"pfxPassword1"];
if (success != YES) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

success = [mailman AddPfxSourceFile: @"/pfxFiles/certs_and_keys_2.pfx" password: @"pfxPassword2"];
if (success != YES) {
    NSLog(@"%@",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.
CkoEmailBundle *bundle = [mailman CopyMail];
if (mailman.LastMethodSuccess == NO) {
    NSLog(@"%@",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, 
int i = 0;
while (i < [bundle.MessageCount intValue]) {
    CkoEmail *email = 0;
    email = [bundle GetEmail: [NSNumber numberWithInt: i]];

    NSLog(@"%@",email.From);
    NSLog(@"%@",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 == YES) {

        NSLog(@"%@",@"This email was encrypted when received.");
        if (email.Decrypted == YES) {
            NSLog(@"%@",@"This email was successfully decrypted.  It was encrypted by:");
            NSLog(@"%@",email.EncryptedBy);
        }
        else {
            NSLog(@"%@",@"This email was not decrypted.");
        }

    }

    if (email.ReceivedSigned == YES) {

        NSLog(@"%@",@"This email was signed when received.");
        if (email.SignaturesValid == YES) {
            NSLog(@"%@",@"The signature was verified.  It was signed by:");
            NSLog(@"%@",email.SignedBy);
        }
        else {
            NSLog(@"%@",@"The signature verification failed.");
        }

    }

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

    NSLog(@"%@",@"--");

    i = i + 1;
}