(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.

Chilkat Objective-C Library Downloads MAC OS X (Cocoa) Libs iOS Libs

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

// 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>";
BOOL 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!");
}