Objective-C

Send Signed Email using PFX File

Demonstrates how to send a signed email using a digital certificate w/ private key stored in a PFX file. Objective-C

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

BOOL success = NO;

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

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

//  Set the SMTP server.
mailman.SmtpHost = @"smtp.mymailserver.com";

//  Create a new email object
CkoEmail *email = [[CkoEmail alloc] init];

email.Subject = @"This email is signed";
email.Body = @"This is a digitally signed mail";
email.From = @"Chilkat Admin <admin@chilkatsoft.com>";
success = [email AddTo: @"Chilkat Support" emailAddress: @"support@chilkatsoft.com"];

//  Indicate that the email should be sent signed.
email.SendSigned = YES;

//  Tell the mailman to use a PFX file as a source for locating
//  the certificate and private key required for signing.
//  The certificate chosen for signing will be the one that
//  matches the sender's email address, which also has
//  a private key.  All intermediate certs in the chain of 
//  authentication, up to and including the root, will
//  be included in the signature.
success = [mailman AddPfxSourceFile: @"/pfx_files/chilkatsoft_secret.pfx" password: @"secret"];
if (success != YES) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

//  Signed email can be sent in two different ways.  
//  In a multipart/signed email, the signature is attached as a separate MIME part.
//  In an opaque email (signedData) the content of the email is encapsulated within the signature
//  and the email is sent as "application/pkcs7-mime". 
//  Either should be fine, but some receiving systems might require one or the other..
mailman.OpaqueSigning = NO;

//  Send a signed email.
success = [mailman SendEmail: email];
if (success != YES) {
    NSLog(@"%@",mailman.LastErrorText);
}
else {
    //  The LastErrorText property provides information
    //  even when successful.
    NSLog(@"%@",mailman.LastErrorText);
    NSLog(@"%@",@"Mail Sent!");
}