(Objective-C) Get Certificate Subject Part by Name or OID

Demonstrates the GetSubjectPart method where a name or OID can be passed.

Chilkat Objective-C Library Downloads MAC OS X (Cocoa) Libs iOS Libs

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

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

BOOL success = [cert LoadByCommonName: @"myCert"];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

// This example demonstrates getting the SERIALNUMBER part of the subject,
// if one such part exists in the cert's subject.
// Not too many certicates include the serial number in the Subject.
// (Chilean issued certificates for SII is one such case where the SERIALNUMBER part exists within the Subject.)
NSString *serialNum = [cert GetSubjectPart: @"SERIALNUMBER"];
if (cert.LastMethodSuccess == NO) {
    NSLog(@"%@",@"No SERIALNUMBER part exists.");
    return;
}

NSLog(@"%@",serialNum);

// We could also get the part by the OID.
// See https://oidref.com/2.5.4.5 for a list of OID's in the 2.5.4.* range..
// The OID for SERIALNUMBER is "2.5.4.5"
serialNum = [cert GetSubjectPart: @"2.5.4.5"];
if (cert.LastMethodSuccess == NO) {
    NSLog(@"%@",@"No SERIALNUMBER part exists.");
    return;
}

NSLog(@"%@",serialNum);