(Objective-C) AddDetachedSignaturePk

Demonstrates how to add a detached signature using a certifcate and it's corresponding private key. The easiest way of doing it is when both the certificate and private key are contained together within a PFX (.pfx or .p12) file. This example demonstrates how to use the certificate and its corresponding private key when they are stored in separate files -- a .cer for the certificate, and a .pem for the private key.

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#import <CkoMime.h>
#import <CkoCert.h>
#import <CkoPrivateKey.h>

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

CkoMime *mime = [[CkoMime alloc] init];

// Load the certificate from a .cer file.
CkoCert *cert = [[CkoCert alloc] init];
BOOL success = [cert LoadFromFile: @"aaworkarea/myCert.cer"];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

// Load the private key from an encrypted PEM file.
// (A private key can be loaded from other file formats also..)
CkoPrivateKey *privKey = [[CkoPrivateKey alloc] init];
success = [privKey LoadEncryptedPemFile: @"aaworkarea/myPrivateKey.pem" password: @"myPassword"];
if (success == NO) {
    NSLog(@"%@",privKey.LastErrorText);
    return;
}

success = [mime SetBodyFromPlainText: @"This is the plain-text MIME body."];

// Sign the MIME (adds a PKCS7 detached signature)
success = [mime AddDetachedSignaturePk: cert privateKey: privKey];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

// Save the S/MIME to a file.
success = [mime SaveMime: @"aaworkarea/signedMime.txt"];
if (success == NO) {
    NSLog(@"%@",mime.LastErrorText);
    return;
}

NSLog(@"%@",@"success!");