(Objective-C) Subject Alternative Name

Demonstrates the usage of the SubjectAlternativeName property to get the certificate SAN (subject alternative name) as XML.

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

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

// Note: Not all certificates contain a Subject Alternative Name.
// If it does not, the SubjectAlternativeName property will contain the empty string.

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

BOOL success = [cert LoadFromFile: @"qa_data/certs/testIcpBrasil.cer"];
if (success == NO) {
    NSLog(@"%@",cert.LastErrorText);
    return;
}

NSString *subjectAltNameXml = cert.SubjectAlternativeName;

NSLog(@"%@",subjectAltNameXml);

// Here's a sample of the subjectAltNameXml:

// <?xml version="1.0" encoding="utf-8"?>
// <SubjectAltName>
//     <name type="oid" oid="2.16.76.1.3.4">...</name>
//     <name type="oid" oid="2.16.76.1.3.2">...</name>
//     <name type="oid" oid="2.16.76.1.3.3">...</name>
//     <name type="oid" oid="2.16.76.1.3.7">...</name>
//     <rfc822Name>...</rfc822Name>
// </SubjectAltName>

// The XML can be parsed like this:

CkoXml *xml = [[CkoXml alloc] init];

[xml LoadXml: subjectAltNameXml];

NSString *oid = 0;
NSString *name = 0;

int i = 0;
int count_i = [[xml NumChildrenHavingTag: @"name"] intValue];
while (i < count_i) {
    xml.I = [NSNumber numberWithInt: i];
    oid = [xml ChilkatPath: @"name[i]|(oid)"];
    name = [xml GetChildContent: @"name[i]"];
    i = i + 1;
}

NSString *rfc822Name = [xml GetChildContent: @"rfc822Name"];