diff --git a/swift/se.swift b/swift/se.swift
index 299fc3c..da0b37b 100644
--- a/swift/se.swift
+++ b/swift/se.swift
@@ -1,64 +1,55 @@
 // import Swift
-import Foundation
+// import Foundation
 // import Security
 import CryptoKit
 import LocalAuthentication
 
-func is_support_secure_enclave() -> Bool {
-    let se = SecureEnclave.isAvailable
-    print("Supports SE: \(se)")
-    return se
+// reference:
+// https://zenn.dev/iceman/scraps/380f69137c7ea2
+// https://www.andyibanez.com/posts/cryptokit-secure-enclave/
+@_cdecl("is_support_secure_enclave")
+func isSupportSecureEnclave() -> Bool {
+    return SecureEnclave.isAvailable
 }
 
 enum StringError: Error {
     case base64error
 }
 
+func generateKeyPair() throws {
+    var error: Unmanaged<CFError>? = nil;
+    guard
+    let accessCtrl = SecAccessControlCreateWithFlags(
+       nil,
+       kSecAttrAccessibleWhenUnlockedThisDeviceOnly,
+       [.privateKeyUsage, .biometryCurrentSet],
+       &error
+    ) else {
+      throw error!.takeRetainedValue() as Swift.Error
+    }
+    var privateKeyReference = try CryptoKit.SecureEnclave.P256.KeyAgreement.PrivateKey.init(
+       accessControl: accessCtrl
+    );
+    var dataRepresentation = privateKeyReference.dataRepresentation;
+    print("Private key reference: \(privateKeyReference)");
+    print("Private key reference - publicKey: \(privateKeyReference.publicKey)");
+    print("Private key reference - dataRepresentation: \(privateKeyReference.dataRepresentation)");
+    print("Private key reference - dataRepresentation: \(privateKeyReference.dataRepresentation.base64EncodedString())");
+}
 
-// // var error: Unmanaged<CFError>? = nil;
-// // guard
-// // let accessCtrl = SecAccessControlCreateWithFlags(
-// //    nil,
-// //    kSecAttrAccessibleWhenUnlockedThisDeviceOnly,
-// //    [.privateKeyUsage, .biometryCurrentSet],
-// //    &error
-// // ) else {
-// //   throw error!.takeRetainedValue() as Swift.Error
-// // }
-// // var privateKeyReference = try CryptoKit.SecureEnclave.P256.KeyAgreement.PrivateKey.init(
-// //    accessControl: accessCtrl
-// // );
-// // var dataRepresentation = privateKeyReference.dataRepresentation;
-//
-// guard let dataRepresentation = Data(base64Encoded: "BIIB2DGCAdQwgfUMAnJrMYHuMAsMA2JpZAQElxyY8jBIDANwdWIEQQQOrOKfvtBWnEquk6+92hH5yxO6SN5TSIA7/kP0DMdzRlojtNQJ3RUs7uJfG/stjJ/Cza+1i+hISbAGaL0BasDPMAgMA3JrbwIBADAHD-----") else {
-//    throw StringError.base64error
-// }
-//
-//
-// let context = LAContext();
-// let p =  try SecureEnclave.P256.KeyAgreement.PrivateKey(
-//         dataRepresentation: dataRepresentation, authenticationContext: context)
-//
-// let ephemeralSecretKey = P256.KeyAgreement.PrivateKey()
-// let sharedSecret = try ephemeralSecretKey.sharedSecretFromKeyAgreement(with: p.publicKey)
-//
-//
-// let sharedSecret2 = try p.sharedSecretFromKeyAgreement(with: ephemeralSecretKey.publicKey)
-//
-//
-//
-// // print("Private key reference: \(privateKeyReference)");
-//
-// // print("Private key reference - publicKey: \(privateKeyReference.publicKey)");
-//
-// // // print("Private key reference - publicKey - ageRecipient: \(privateKeyReference.publicKey.ageRecipient)");
-//
-// // print("Private key reference - dataRepresentation: \(privateKeyReference.dataRepresentation)");
-// // print("Private key reference - dataRepresentation: \(privateKeyReference.dataRepresentation.base64EncodedString())");
-//
-// // https://www.andyibanez.com/posts/cryptokit-secure-enclave/
-//
-//
-//
-// print("Shared secret: \(sharedSecret)")
-// print("Shared secret: \(sharedSecret2)")
\ No newline at end of file
+func computeEcdh() throws {
+    guard let dataRepresentation = Data(base64Encoded: "BIIB2DGCAdQwgfUMAnJrMYHuMAsMA2JpZAQElx-----"
+    ) else {
+       throw StringError.base64error
+    }
+
+    let context = LAContext();
+    let p =  try SecureEnclave.P256.KeyAgreement.PrivateKey(
+            dataRepresentation: dataRepresentation, authenticationContext: context)
+
+    let ephemeralSecretKey = P256.KeyAgreement.PrivateKey()
+    let sharedSecret = try ephemeralSecretKey.sharedSecretFromKeyAgreement(with: p.publicKey)
+    let sharedSecret2 = try p.sharedSecretFromKeyAgreement(with: ephemeralSecretKey.publicKey)
+    print("Shared secret: \(sharedSecret)")
+    print("Shared secret: \(sharedSecret2)")
+}