Objective-C

POP3 Read S/MIME Encrypted Email

Read S/MIME encrypted email. Objective-C

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

BOOL success = NO;

//  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.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: @"/pfxFiles/certs_and_keys_1.pfx" password: @"pfxPassword1"];
if (success == NO) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

success = [mailman AddPfxSourceFile: @"/pfxFiles/certs_and_keys_2.pfx" password: @"pfxPassword2"];
if (success == NO) {
    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 = [[CkoEmailBundle alloc] init];
BOOL keepOnServer = YES;
BOOL headersOnly = NO;
//  Irrelevent because we are NOT downloading headers-only
int numBodyLines = 0;
success = [mailman FetchAll: keepOnServer headersOnly: headersOnly numBodyLines: [NSNumber numberWithInt: numBodyLines] bundle: bundle];
if (success == 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
CkoEmail *email = [[CkoEmail alloc] init];
int i = 0;
while (i < [bundle.MessageCount intValue]) {

    [bundle EmailAt: [NSNumber numberWithInt: i] email: email];

    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;
}