Support AES with GCM mode

Bark/en.lproj/Localizable.strings

@@ -129,7 +129,7 @@ exportOrImport = "Export and import messages";
 items = "messages";
 
 enterKey = "Please enter %d-bit Key";
-enterIv = "Please enter 16-bit Iv";
+enterIv = "Please enter %d-bit Iv";
 encryptionSettings = "Encryption Settings";
 algorithm = "Algorithm";
 mode = "Mode";

Bark/tr.lproj/Localizable.strings

@@ -129,7 +129,7 @@ exportOrImport = "Mesajları dışa ve içe aktarma";
 items = "mesajlar";
 
 enterKey = "Lütfen %d-bit Anahtar girin";
-enterIv = "Lütfen 16 bit Iv girin";
+enterIv = "Lütfen %d-bit Iv girin";
 encryptionSettings = "Şifreleme Ayarları";
 algorithm = "Algoritma";
 mode = "Mod";

Bark/zh-Hans.lproj/Localizable.strings

@@ -129,7 +129,7 @@ exportOrImport = "导出或导入消息列表";
 items = "条消息";
 
 enterKey = "请输入%d位Key";
-enterIv = "请输入16位Iv";
+enterIv = "请输入%d位Iv";
 encryptionSettings = "加密设置";
 algorithm = "算法";
 mode = "模式";

Controller/CryptoSettingController.swift

@@ -11,7 +11,7 @@ import UIKit
 
 class CryptoSettingController: BaseViewController<CryptoSettingViewModel> {
     let algorithmFeild = DropBoxView(values: ["AES128", "AES192", "AES256"])
-    let modeFeild = DropBoxView(values: ["CBC", "ECB"])
+    let modeFeild = DropBoxView(values: ["CBC", "ECB", "GCM"])
     let paddingField = DropBoxView(values: ["pkcs7"])
 
     let keyTextField: BorderTextField = {
@@ -24,7 +24,7 @@ class CryptoSettingController: BaseViewController<CryptoSettingViewModel> {
     let ivTextField: BorderTextField = {
         let textField = BorderTextField(title: "IV")
         textField.font = UIFont.systemFont(ofSize: 14)
-        textField.placeholder = NSLocalizedString("enterIv")
+        textField.placeholder = String(format: NSLocalizedString("enterIv"), 16) // todo: update iv length
         return textField
     }()
 
@@ -222,8 +222,8 @@ class CryptoSettingController: BaseViewController<CryptoSettingViewModel> {
             .drive(self.paddingField.rx.values)
             .disposed(by: rx.disposeBag)
 
-        output.keyLenghtChanged.drive(onNext: { [weak self] keyLenght in
-            self?.keyTextField.placeholder = String(format: NSLocalizedString("enterKey"), keyLenght)
+        output.keyLengthChanged.drive(onNext: { [weak self] keyLength in
+            self?.keyTextField.placeholder = String(format: NSLocalizedString("enterKey"), keyLength)
         }).disposed(by: rx.disposeBag)
 
         output.showSnackbar.drive(onNext: { text in

Controller/CryptoSettingViewModel.swift

@@ -22,7 +22,7 @@ class CryptoSettingViewModel: ViewModel, ViewModelType {
         let initial: Driver<(algorithmList: [Algorithm], modeList: [String], paddingList: [String], initialFields: CryptoSettingFields?)>
         let modeListChanged: Driver<[String]>
         let paddingListChanged: Driver<[String]>
-        let keyLenghtChanged: Driver<Int>
+        let keyLengthChanged: Driver<Int>
         let showSnackbar: Driver<String>
         let done: Driver<Void>
         let copy: Driver<String>
@@ -56,14 +56,14 @@ class CryptoSettingViewModel: ViewModel, ViewModelType {
             .compactMap { Algorithm(rawValue: $0) }
             .map { $0.modes }
 
-        let keyLenght =
+        let keyLength =
             Driver.merge([
                 Driver.just(dependencies.settingFieldRelay.value)
                     .compactMap { $0 }
-                    .compactMap { Algorithm(rawValue: $0.algorithm)?.keyLenght },
+                    .compactMap { Algorithm(rawValue: $0.algorithm)?.keyLength },
                 input
                     .algorithmChanged
-                    .compactMap { Algorithm(rawValue: $0)?.keyLenght },
+                    .compactMap { Algorithm(rawValue: $0)?.keyLength },
             ])
 
         // 保存配置
@@ -135,13 +135,13 @@ class CryptoSettingViewModel: ViewModel, ViewModelType {
         return Output(
             initial: Driver.just((
                 algorithmList: [Algorithm.aes128, Algorithm.aes192, Algorithm.aes256],
-                modeList: ["CBC", "ECB"],
-                paddingList: ["okcs7"],
+                modeList: ["CBC", "ECB", "GCM"],
+                paddingList: ["pkcs7"],
                 initialFields: dependencies.settingFieldRelay.value
             )),
             modeListChanged: modeList,
             paddingListChanged: Driver.just(["pkcs7"]),
-            keyLenghtChanged: keyLenght,
+            keyLengthChanged: keyLength,
             showSnackbar: showSnackbar.asDriver(onErrorDriveWith: .empty()),
             done: done.map { _ in () },
             copy: copy

Model/Algorithm.swift

@@ -17,7 +17,7 @@ enum Algorithm: String {
     var modes: [String] {
         switch self {
         case .aes128, .aes192, .aes256:
-            return ["CBC", "ECB"]
+            return ["CBC", "ECB", "GCM"]
         }
     }
 
@@ -28,7 +28,7 @@ enum Algorithm: String {
         }
     }
 
-    var keyLenght: Int {
+    var keyLength: Int {
         switch self {
         case .aes128:
             return 16
@@ -61,17 +61,25 @@ struct AESCryptoModel {
             throw "Key is missing"
         }
 
-        guard algorithm.keyLenght == key.count else {
-            throw String(format: NSLocalizedString("enterKey"), algorithm.keyLenght)
+        guard algorithm.keyLength == key.count else {
+            throw String(format: NSLocalizedString("enterKey"), algorithm.keyLength)
         }
 
         var iv = ""
-        if ["CBC"].contains(cryptoFields.mode) {
-            if let ivField = cryptoFields.iv, ivField.count == 16 {
+        if ["CBC", "GCM"].contains(cryptoFields.mode) {
+            var expectIVLength = 0
+            if cryptoFields.mode == "CBC" {
+                expectIVLength = 16
+            }
+            else if cryptoFields.mode == "GCM" {
+                expectIVLength = 12
+            }
+
+            if let ivField = cryptoFields.iv, ivField.count == expectIVLength {
                 iv = ivField
             }
             else {
-                throw NSLocalizedString("enterIv")
+                throw String(format: NSLocalizedString("enterIv"), expectIVLength)
             }
         }
 
@@ -81,6 +89,8 @@ struct AESCryptoModel {
             mode = CBC(iv: iv.bytes)
         case "ECB":
             mode = ECB()
+        case "GCM":
+            mode = GCM(iv: iv.bytes)
         default:
             throw "Invalid Mode"
         }