(Objective-C) Use a Custom Set of Trusted Root Certificates

Demonstrates how to build a set of trusted root certificates to be used globally by all Chilkat classes.

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#import <CkoTrustedRoots.h>
#import <CkoZip.h>
#import <CkoZipEntry.h>
#import <NSString.h>
#import <CkoCert.h>

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

CkoTrustedRoots *trustedRoots = [[CkoTrustedRoots alloc] init];

//  Indicate that we will NOT trust any pre-installed certificates on the system.
trustedRoots.TrustSystemCaRoots = NO;

// Thawte is a certificate authority that provides a .zip download of their
// root CA certificates:  https://www.thawte.com/roots/index.html
// The direct download link is: https://www.verisign.com/support/thawte-roots.zip
// Note: The above URLs are valid at the time of writing this example (29-May-2015).

// Assuming the .zip has already been downloaded, open it and load each .pem file into
// our trusted roots object.
CkoZip *zip = [[CkoZip alloc] init];

// Open a .zip containing PEM files, among other things..
BOOL success = [zip OpenZip: @"qa_data/certs/thawte-roots.zip"];
if (success != YES) {
    NSLog(@"%@",zip.LastErrorText);
    return;
}

CkoZipEntry *entry = [zip FirstMatchingEntry: @"*.pem"];
if (zip.LastMethodSuccess != YES) {
    NSLog(@"%@",@"No entries matched.");
    return;
}

CkoZipEntry *nextEntry = 0;
NSString *pemStr = 0;

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

BOOL bHasMoreEntries = YES;
while ((bHasMoreEntries == YES)) {

    NSLog(@"%@%@",@"Entry: ",entry.FileName);

    // Get the PEM of the CA cert:
    pemStr = [entry UnzipToString: [NSNumber numberWithInt: 0] srcCharset: @"utf-8"];

    // Load it into a certificate object:
    success = [cert LoadPem: pemStr];
    if (success != YES) {
        NSLog(@"%@",cert.LastErrorText);
    }

    // Add it to the trusted roots.
    [trustedRoots AddCert: cert];

    // The NextMatchingEntry method was added in v9.5.0.50
    nextEntry = [entry NextMatchingEntry: @"*.pem"];
    bHasMoreEntries = entry.LastMethodSuccess;

    entry = nextEntry;
}

//  Activate the trusted roots globally for all Chilkat objects.
//  This call really shouldn't fail, so we're not checking the return value.
success = [trustedRoots Activate];