How to get private key from p12 in X509 certificate - ssl

Question

I need to integrate my iOS app to consume a Web service requires a client certificate. I am using the below code to extract the private key from p12 in X509 certificate.
I found this code but not working, I translated it to swift 3.
func privateKeyFromCertificate() -> SecKeyRef {
let certName : String = //name of the certificate//
let resourcePath: String = NSBundle.mainBundle().pathForResource(certName, ofType: "p12")!
let p12Data: NSData = NSData(contentsOfFile: resourcePath)!
let key : NSString = kSecImportExportPassphrase as NSString
let options : NSDictionary = [key : "password_for_certificate"]
var privateKeyRef: SecKeyRef? = nil
var items : CFArray?
let securityError: OSStatus = SecPKCS12Import(p12Data, options, &items)
//let description : CFString = CFCopyDescription(items)
//print(description)
let theArray : CFArray = items!
if securityError == noErr && CFArrayGetCount(theArray) > 0 {
let newArray = theArray as [AnyObject] as NSArray
let dictionary = newArray.objectAtIndex(0)
let secIdentity = dictionary.valueForKey(kSecImportItemIdentity as String) as! SecIdentityRef
let securityError = SecIdentityCopyPrivateKey(secIdentity , &privateKeyRef)
if securityError != noErr {
privateKeyRef = nil
}
}
return privateKeyRef!
}
The error encounter at :
let secIdentity = dictionary.valueForKey(kSecImportItemIdentity as String) as! SecIdentityRef
Below Updated version has the same problem at the same line:
func privateKeyFromCertificate() -> SecKey {
let certName : String = "certficateName"
let resourcePath: String = Bundle.main.path(forResource: certName, ofType: "p12")!
let p12Data: NSData = NSData(contentsOfFile: resourcePath)!
let key : NSString = kSecImportExportPassphrase as NSString
let options : NSDictionary = [key : "password_for_certificate"]
var privateKeyRef: SecKey? = nil
var items : CFArray?
let securityError: OSStatus = SecPKCS12Import(p12Data, options, &items)
//let description : CFString = CFCopyDescription(items)
//print(description)
let theArray : CFArray = items!
if securityError == noErr && CFArrayGetCount(theArray) > 0 {
let newArray = theArray as [AnyObject] as NSArray
let dictionary = newArray.object(at: 0)
//- encounter error here:
let secIdentity = (dictionary as AnyObject).value(kSecImportItemIdentity as String) as! SecIdentity
let securityError = SecIdentityCopyPrivateKey(secIdentity , &privateKeyRef)
if securityError != noErr {
privateKeyRef = nil
}
}
return privateKeyRef!
}
I get the following error:
let secIdentity = (dictionary as AnyObject).value(kSecImportItemIdentity as String) as! SecIdentity
Cannot invoke 'Value' with any argument list of Type '(String)'
Your help is greatly appreciated.
Thanks

Answer 1

Can you try this for the error block - putting them in conditional id let block.
if let secIdentity = (dictionary as AnyObject).value(forKey: kSecImportItemIdentity as String) {
let securityError = SecIdentityCopyPrivateKey(secIdentity as! SecIdentity , &privateKeyRef)
if securityError != noErr {
privateKeyRef = nil
}
}