(Objective-C) Send Encrypted Email using Certificate in Apple Keychain

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Send encrypted (S/MIME) email using a certificate found in the Apple Keychain.

Note: This example requires Chilkat v10.1.2 or later.

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#import <CkoEmail.h>
#import <NSString.h>
#import <CkoCert.h>
#import <CkoMailMan.h>
#import <CkoSecrets.h>
#import <CkoJsonObject.h>

CkoEmail *email = [[CkoEmail alloc] init];
email.Subject = @"This email is encrypted";
email.Body = @"This is a S/MIME encrypted mail";
email.From = @"Joe <joe@example.com>";

// Emails are encrypted using the recipient's certificate.
NSString *recipientEmailAddr = @"jane@example2.com";
[email AddTo: @"" emailAddress: recipientEmailAddr];

// Indicate that the email is to be sent encrypted.
email.SendEncrypted = YES;

CkoCert *cert = [[CkoCert alloc] init];

// -----------------------------------------------
// This example requires Chilkat v10.1.2 or later.
// -----------------------------------------------

// The recipient's certificate is used to encrypt.
// This will load the certificate from the Apple Keychain.
BOOL success = [cert LoadByEmailAddress: recipientEmailAddr];
if (success != YES) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

// Specify the certificate to be used for encryption.
success = [email SetEncryptCert: cert];
email.SendEncrypted = YES;

CkoMailMan *mailman = [[CkoMailMan alloc] init];
mailman.SmtpHost = @"smtp.example.com";
mailman.SmtpUsername = @"joe@example.com";
mailman.SmtpPort = [NSNumber numberWithInt:587];
mailman.StartTLS = YES;

// We'll get the SMTP password from the Apple Keychain.
// See how we originally saved the email credentials to the Keychain here:
// Save Email Credentials in Apple Keychain or Windows Credentials Manager
CkoSecrets *secrets = [[CkoSecrets alloc] init];

// On Windows, this is the Windows Credentials Manager
// On MacOS/iOS, it is the Apple Keychain
secrets.Location = @"local_manager";

// Specify the name of the secret.
// service and username are required.
// appName and domain are optional.
// Note: The values are arbitrary and can be anything you want.
CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json UpdateString: @"appName" value: @"MyEmailApp"];
[json UpdateString: @"service" value: @"SMTP"];
[json UpdateString: @"domain" value: @"example.com"];
[json UpdateString: @"username" value: @"joe@example.com"];

mailman.SmtpPassword = [secrets GetSecretStr: json];

// Send the encrypted email.
// The email is encrypted and sent within the SendEmail function.
success = [mailman SendEmail: email];
if (success != YES) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

NSLog(@"%@",@"Encrypted email sent!");