Objective-C

Get the Signer Details of a Signed Email

Demonstrates the read-only Chilkat Email.SignedBy property. If the email was received digitally signed, this contains the fields of the signer certificate's Subject Distinguished Name, for example: US, 94105, California, San Francisco, 100 Market Street, Northwind Research LLC, Engineering, Avery Morgan. The values appear without the attribute-name prefixes (C=, ST=, L=, O=, CN=). It is intended for display or diagnostics; use LastSignerCert when the certificate object itself is needed.

Background: Every certificate identifies its owner with a Subject Distinguished Name (Subject DN) — a structured set of fields like Country (C), State (ST), Organization (O), and Common Name (CN). The CN is typically the person or entity the certificate was issued to. SignedBy gives you a human-readable rendering of that identity, which is handy for showing "who signed this?" without needing to parse the certificate yourself.

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Objective-C

#import <CkoEmail.h>

BOOL success = NO;

//  Demonstrates the read-only Email.SignedBy property.  If the email was received
//  digitally signed, this contains the fields of the signer certificate's SubjectDN
//  (without the C=, ST=, L=, O=, CN= attribute names).

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

success = [email LoadEml: @"qa_data/eml/signed.eml"];
if (success == NO) {
    NSLog(@"%@",email.LastErrorText);
    return true;
}

if (email.ReceivedSigned == YES) {
    NSLog(@"%@%@",@"Signed by: ",email.SignedBy);
}
else {
    NSLog(@"%@",@"This email was not signed.");
}

//  Note: Paths such as "qa_data/..." are relative local filesystem paths,
//  relative to the current working directory of the running application.