CertificateKit

CertificateKit is an advanced iOS library for working with SSL/TLS X.509 certificates. It's primarily used within the TLS Inspector iOS app but can be used in any iOS project.

The primary goal with CertificateKit is to provide an easy-to-use front-end to OpenSSLs X.509 APIs.

API Reference

Installation

Due to the complex nature of CertificateKit, it cannot be installed using Cocoapods and must be installed manually.

1. Download the Latest Release
2. Add the CertificateKit.framework file to your project by dragging and dropping it onto the Project Navigator in Xcode

Getting Started

To get a chain of certificates (Root, Intermediate, and Server) for a given URL:

Objective-C:

self.chain = [CKCertificateChain new];

[self.chain
 certificateChainFromURL:[NSURL URLWithString:@"https://tls-inspector.com"]
 finished:^(NSError * _Nullable error, CKCertificateChain * _Nullable chain) {
     if (error) {
         // Do something
     }

     // Is the chain trusted
     switch (chain.trusted) {
         case CKCertificateChainTrustStatusTrusted:
             // Trusted by system
             break;
         case CKCertificateChainTrustStatusUntrusted:
             // Untrusted by system
             break;
     }

     // Is the server certificate revoked
     if (chain.server.revoked.isRevoked) {
         // Print the reason why it was revoked
         NSLog(@"%@", chain.server.revoked.reasonString);
     }
 }];

Swift:

let chain: CKCertificateChain = CKCertificateChain()

chain.certificateChain(from: URL(string: "https://tls-inspector.com")!) { (error, chain) in
    if error != nil {
        // Do something
    }

    // Is the chain trusted
    if let trust: CKCertificateChainTrustStatus = chain?.trusted {
        switch trust {
            case .trusted:
                // Trusted by system
            break
            case .untrusted:
                // Untrusted by system
            break
        }
    }

    // Is the server certificate revoked
    if chain?.server?.revoked.isRevoked ?? false {
        let reasonString = chain?.server?.revoked.reasonString
        print(reasonString)
    }
}

For more information see the API Reference.