Objective-C

Send a Signed Email using RSASSA-PSS with SHA256

See more SMTP Examples

Demonstrates how to sign and send an email using the RSASSA-PSS signing algorithm with the SHA256 hash algorithm. . Objective-C

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

BOOL success = NO;

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

//  Get a digital certificate with private key from a .pfx
//  (Chilkat has many different ways to provide a cert + private key for siging.
//  Using a PFX is just one possible option.)
CkoPfx *pfx = [[CkoPfx alloc] init];
success = [pfx LoadPfxFile: @"qa_data/rsassa-pss/privatekey.pfx" password: @"PFX_PASSWORD"];
if (success == NO) {
    NSLog(@"%@",pfx.LastErrorText);
    return;
}

CkoEmail *email = [[CkoEmail alloc] init];

//  Create a simple email.
email.Subject = @"Sample RSASSA-PSS Signed Email";
email.Body = @"Sample RSASSA-PSS Signed Email";
email.From = @"from_name@mydomain.com";
//  Add one ore more recipients..
[email AddTo: @"Chilkat Support" emailAddress: @"support@chilkatsoft.com"];
[email AddTo: @"Chilkat GMail" emailAddress: @"chilkat.support@gmail.com"];

//  Indicate that the email is to be signed, and that we want to use RSASSA-PSS.
email.SendSigned = YES;
email.SigningAlg = @"pss";
email.SigningHashAlg = @"sha256";

//  Get the certificate to be used for signing.
//  (The typical case for a PFX is that it contains a cert with an associated private key,
//  as well as other certificates in the chain of authentication.  The cert with the private
//  key should be in the first position at index 0.)

CkoCert *cert = [[CkoCert alloc] init];
success = [pfx CertAt: [NSNumber numberWithInt: 0] cert: cert];
if (success == NO) {
    NSLog(@"%@",pfx.LastErrorText);
    return;
}

//  Tell the email object to use this cert (and private key) for signing.
[email SetSigningCert: cert];

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

//  Set the SMTP settings for your email account on your mail server.
mailman.SmtpUsername = @"SMTP_LOGIN";
mailman.SmtpPassword = @"SMTP_PASSWORD";
mailman.SmtpHost = @"MY_SMTP_DOMAIN_OR_IP";
mailman.SmtpPort = [NSNumber numberWithInt:587];
mailman.StartTLS = YES;

//  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 the email.  The mailman will sign the email as directed by the 
//  property settings of the email object.
success = [mailman SendEmail: email];
if (success == NO) {
    NSLog(@"%@",mailman.LastErrorText);
    return;
}

success = [mailman CloseSmtpConnection];
if (success != YES) {
    NSLog(@"%@",@"Connection to SMTP server not closed cleanly.");
}

NSLog(@"%@",@"Mail Sent!");

//  -----------------------------------------------------------
//  This is the MIME of the RSASSA-PSS signed email that was sent

//  	MIME-Version: 1.0
//  	Date: Thu, 20 Apr 2017 10:14:58 -0500
//  	Message-ID: <3682A87344CB3A4FB5EB5BC9908C0C4DA01DA461@CHILKAT13>
//  	Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha256;
//  	 boundary="------------050103020705000601010800"
//  	X-Priority: 3 (Normal)
//  	Subject: Sample RSASSA-PSS Signed Email
//  	From: support@chilkatsoft.com
//  	To: "Chilkat Support" <support@chilkatsoft.com>,
//  	 "Chilkat GMail" <chilkat.support@gmail.com>
//  
//  	--------------050103020705000601010800
//  	Content-Type: text/plain; format=flowed
//  	Content-Transfer-Encoding: 7bit
//  
//  	Sample RSASSA-PSS Signed Email
//  	--------------050103020705000601010800
//  	Content-Transfer-Encoding: base64
//  	Content-Type: application/pkcs7-signature; name="smime.p7s"
//  	Content-Disposition: attachment; filename="smime.p7s"
//  
//  	MIIG5wYJKoZIhvcNAQcCoIIG2DCCBtQCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
//  	ggL4MIIC9DCCAl2gAwIBAgIJAMPsJCT11cniMA0GCSqGSIb3DQEBCwUAMIGSMQswCQYDVQQGEwJB
//  	VTERMA8GA1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEhMB8GA1UECgwYSW50ZXJu
//  	ZXQgV2lkZ2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkqhkiG9w0BCQEWGWFkbWlu
//  	QGludGVybmV0d2lkZ2V0cy5jb20wHhcNMTYxMTAxMTY1MjMyWhcNMjExMDMxMTY1MjMyWjCBkjEL
//  	MAkGA1UEBhMCQVUxETAPBgNVBAgMCFZpY3RvcmlhMRIwEAYDVQQHDAlNZWxib3VybmUxITAfBgNV
//  	BAoMGEludGVybmV0IFdpZGdpdHMgUHR5IEx0ZDEPMA0GA1UEAwwGV2lkZ2V0MSgwJgYJKoZIhvcN
//  	AQkBFhlhZG1pbkBpbnRlcm5ldHdpZGdldHMuY29tMIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKB
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//  	41wQ5A==
//  
//  	--------------050103020705000601010800--