We are trying to create a ’SecKey’ from a ‘.der’ file. But ‘SecKeyCreateWithData’ always throw ‘Nil ’ with Error. Steps Followed:: First we created a ECDSA Private & Public key pair with the below Commands , then converted the .pem file holding the private key to ‘.der’file. Finally used the ‘.der’ file to generate a ‘SecKey’ via code. Commands Used to Generate Private & Public Keys:: openssl ecparam -genkey -name prime256v1 -noout -out ec-key-pair.pem openssl ec -in ec-key-pair.pem -pubout -out ec-key-pair.pub Command Used to Generate .Der file:: openssl pkey -outform der -in ec-key-pair.pem -out ec-key-pair.der Content Inside .pem file:: -----BEGIN EC PRIVATE KEY----- MHcCAQEEIKJTc3zI8D07Myh7ZIR+wGyQgsjEeKdH0+hSiErK5AjzoAoGCCqGSM49 AwEHoUQDQgAEvbOBrM/D2fX05zKQYuJiTRP6YiUBabImrHb9s+OHimxUxX+E9jVe oQ6nxSOkfgm0H1OjLfp2xGLqkDTuF38UGQ== -----END EC PRIVATE KEY----- Error Received:: Unmanaged - _value : Error Domain=NSOSStatusErrorDomain Code=-50 "EC private key creation from data failed" UserInfo={NSDescription=EC private key creation from data failed} Minimum Deployment Target Used:: iOS 14.0 Code Used:: if let certificateData = NSData(contentsOf:Bundle.main.url(forResource: "ec-key-pair", withExtension: "der")! ) {       var error: Unmanaged<CFError>? = nil       let privateSecKey = SecKeyCreateWithData(certificateData , [           kSecAttrKeyType: kSecAttrKeyTypeEC,           kSecAttrKeyClass: kSecAttrKeyClassPrivate] as NSDictionary, &error) }