(Objective-C) Find Certificate by Subject O (Organization)

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Note: Requires Chilkat v10.1.2 or later.

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#import <CkoCertStore.h>
#import <CkoJsonObject.h>
#import <NSString.h>
#import <CkoCert.h>

CkoCertStore *certStore = [[CkoCertStore alloc] init];

// This opens the Current User certificate store on Windows,
// On MacOS and iOS it opens the default Keychain.
BOOL readOnly = NO;
BOOL success = [certStore OpenCurrentUserStore: readOnly];
if (success == NO) {
    NSLog(@"%@",certStore.LastErrorText);
    return;
}

// Find the certificate having a Subject O = "ICP-Brasil".
CkoJsonObject *json = [[CkoJsonObject alloc] init];
NSString *organization = @"ICP-Brasil";
[json UpdateString: @"O" value: organization];

CkoCert *cert = [[CkoCert alloc] init];
success = [certStore FindCert: json cert: cert];
if (success == YES) {
    // Show the full distinguished name of the certificate.
    NSLog(@"%@%@",@"Found: ",cert.SubjectDN);
}
else {
    NSLog(@"%@",@"Not found.");
}