在iPhone上的应用程序中使用已安装的身份证书

My question is: is there a way to use the installed identity certificates on the phone from within my app. For example similar case like with Safari: if certain site requires client certificate, the user has to install it on the phone and then when authenticating Safari uses the installed certificate to authenticate. I need to do the same:My question is: is there a way to use the insta