CODE EXAMPLE FOR SWIFT

swift api call with certificate

public struct IdentityAndTrust {

    public var identityRef:SecIdentity
    public var trust:SecTrust
    public var certArray:NSArray
}

public func extractIdentity(certData:NSData, certPassword:String) -> IdentityAndTrust {

    var identityAndTrust:IdentityAndTrust!
    var securityError:OSStatus = errSecSuccess

    var items: CFArray?
    let certOptions: Dictionary = [ kSecImportExportPassphrase as String : certPassword ];
    // import certificate to read its entries
    securityError = SecPKCS12Import(certData, certOptions as CFDictionary, &items);
    if securityError == errSecSuccess {

        let certItems:CFArray = items as CFArray!;
        let certItemsArray:Array = certItems as Array
        let dict:AnyObject? = certItemsArray.first;

        if let certEntry:Dictionary = dict as? Dictionary<String, AnyObject> {

            // grab the identity
            let identityPointer:AnyObject? = certEntry["identity"];
            let secIdentityRef:SecIdentity = identityPointer as! SecIdentity!;

            // grab the trust
            let trustPointer:AnyObject? = certEntry["trust"];
            let trustRef:SecTrust = trustPointer as! SecTrust;

            // grab the certificate chain
            var certRef: SecCertificate?
            SecIdentityCopyCertificate(secIdentityRef, &certRef);
            let certArray:NSMutableArray = NSMutableArray();
            certArray.add(certRef as SecCertificate!);

            identityAndTrust = IdentityAndTrust(identityRef: secIdentityRef, trust: trustRef, certArray: certArray);
        }
    }

    return identityAndTrust;
}