(Objective-C) Apple Keychain - Get Certificate by Common Name

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Retrieves the certificate from the Apple Keychain that matches the specified common name (CN).

Note: This example requires Chilkat v10.0.0 or greater.

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#import <CkoCert.h>

// On MacOS or iOS, this searches both the Default keychains and System keychains for the certificate
// having the specified CN.
CkoCert *cert = [[CkoCert alloc] init];
BOOL success = [cert LoadByCommonName: @"Certum CA"];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

NSLog(@"%@",cert.SubjectDN);

// Note: In the Apple Keychain, a certificate with its private key represents an identity because it combines the certificate and its private key.
// When Chilkat loads a certificate from the Apple Keychain, it also gets the associated private key.
// You can simply use the cert in other places in Chilkat where a cert w/ private key is required.
CkoCert *cert2 = [[CkoCert alloc] init];
success = [cert2 LoadByCommonName: @"Chilkat Software, Inc."];
if (success == NO) {
    NSLog(@"%@",cert2.LastErrorText);
    return;
}

NSLog(@"%@",cert2.SubjectDN);
BOOL hasPrivKey = [cert2 HasPrivateKey];
NSLog(@"%@%d",@"Has private key: ",hasPrivKey);

NSLog(@"%@",@"Success.");