How do I programmatically import a certificate into my iOS app's keychain and pass the identity to a server when needed?

Question

I am working on an iOS5 application that will facilitate mobile payments between two users. As part of the payment process, the sender and the recipient need to communicate with

Answer 1

Swift 4.0

 if let url = Bundle.main.url(forResource: "XXX", withExtension: "pem") {

            let PKCS12Data = NSData(contentsOf: url)
            let inPKCS12Data = CFDataCreate(kCFAllocatorDefault, PKCS12Data!.bytes.assumingMemoryBound(to: UInt8.self), (PKCS12Data?.length)!)

            let keys: [CFString] = [kSecImportExportPassphrase]
            let values: [CFTypeRef] = []

            let keysPointer = UnsafeMutablePointer.allocate(capacity: keys.count)
            keysPointer.initialize(to: keys)

            let valuesPointer = UnsafeMutablePointer.allocate(capacity: values.count)
            valuesPointer.initialize(to: values)

            let optionsDictionary = CFDictionaryCreate(kCFAllocatorDefault, keysPointer, valuesPointer, 1, nil, nil)

            var items = CFArrayCreate(kCFAllocatorDefault, UnsafeMutablePointer.allocate(capacity: 0), 0, nil)
            let securityError = SecPKCS12Import(inPKCS12Data!, optionsDictionary!, &items)
            if (securityError == 0) {
                print("Certificate installed Successfully")
            } else {
                print("Certificate installation failed")
            }

    }