From b8a04fdf5795cc64b9ac4de849a6d08c63bb19a9 Mon Sep 17 00:00:00 2001
From: Christoph Hagen <christoph@spacemasters.eu>
Date: Sat, 29 Jan 2022 18:59:42 +0100
Subject: [PATCH] Initial version

---
 Sesame.xcodeproj/project.pbxproj              | 372 ++++++++++++++++++
 .../contents.xcworkspacedata                  |   7 +
 .../xcshareddata/IDEWorkspaceChecks.plist     |   8 +
 .../UserInterfaceState.xcuserstate            | Bin 0 -> 30473 bytes
 .../xcschemes/xcschememanagement.plist        |  14 +
 .../AccentColor.colorset/Contents.json        |  11 +
 .../AppIcon.appiconset/Contents.json          |  98 +++++
 Sesame/Assets.xcassets/Contents.json          |   6 +
 Sesame/Client.swift                           | 105 +++++
 Sesame/ClientState.swift                      | 137 +++++++
 Sesame/ContentView.swift                      | 164 ++++++++
 Sesame/KeyManagement.swift                    | 118 ++++++
 .../Preview Assets.xcassets/Contents.json     |   6 +
 Sesame/Response.swift                         |  80 ++++
 Sesame/SesameApp.swift                        |  17 +
 Sesame/ShareSheet.swift                       |  21 +
 Sesame/SymmetricKey+Extensions.swift          |  21 +
 17 files changed, 1185 insertions(+)
 create mode 100644 Sesame.xcodeproj/project.pbxproj
 create mode 100644 Sesame.xcodeproj/project.xcworkspace/contents.xcworkspacedata
 create mode 100644 Sesame.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
 create mode 100644 Sesame.xcodeproj/project.xcworkspace/xcuserdata/imac.xcuserdatad/UserInterfaceState.xcuserstate
 create mode 100644 Sesame.xcodeproj/xcuserdata/imac.xcuserdatad/xcschemes/xcschememanagement.plist
 create mode 100644 Sesame/Assets.xcassets/AccentColor.colorset/Contents.json
 create mode 100644 Sesame/Assets.xcassets/AppIcon.appiconset/Contents.json
 create mode 100644 Sesame/Assets.xcassets/Contents.json
 create mode 100644 Sesame/Client.swift
 create mode 100644 Sesame/ClientState.swift
 create mode 100644 Sesame/ContentView.swift
 create mode 100644 Sesame/KeyManagement.swift
 create mode 100644 Sesame/Preview Content/Preview Assets.xcassets/Contents.json
 create mode 100644 Sesame/Response.swift
 create mode 100644 Sesame/SesameApp.swift
 create mode 100644 Sesame/ShareSheet.swift
 create mode 100644 Sesame/SymmetricKey+Extensions.swift

diff --git a/Sesame.xcodeproj/project.pbxproj b/Sesame.xcodeproj/project.pbxproj
new file mode 100644
index 0000000..39061e4
--- /dev/null
+++ b/Sesame.xcodeproj/project.pbxproj
@@ -0,0 +1,372 @@
+// !$*UTF8*$!
+{
+	archiveVersion = 1;
+	classes = {
+	};
+	objectVersion = 55;
+	objects = {
+
+/* Begin PBXBuildFile section */
+		884A45B7279F48C100D6E650 /* SesameApp.swift in Sources */ = {isa = PBXBuildFile; fileRef = 884A45B6279F48C100D6E650 /* SesameApp.swift */; };
+		884A45B9279F48C100D6E650 /* ContentView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 884A45B8279F48C100D6E650 /* ContentView.swift */; };
+		884A45BB279F48C300D6E650 /* Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 884A45BA279F48C300D6E650 /* Assets.xcassets */; };
+		884A45BE279F48C300D6E650 /* Preview Assets.xcassets in Resources */ = {isa = PBXBuildFile; fileRef = 884A45BD279F48C300D6E650 /* Preview Assets.xcassets */; };
+		884A45C5279F4BBE00D6E650 /* KeyManagement.swift in Sources */ = {isa = PBXBuildFile; fileRef = 884A45C4279F4BBE00D6E650 /* KeyManagement.swift */; };
+		884A45C727A429EF00D6E650 /* ShareSheet.swift in Sources */ = {isa = PBXBuildFile; fileRef = 884A45C627A429EF00D6E650 /* ShareSheet.swift */; };
+		884A45C927A43D7900D6E650 /* ClientState.swift in Sources */ = {isa = PBXBuildFile; fileRef = 884A45C827A43D7900D6E650 /* ClientState.swift */; };
+		884A45CB27A464C000D6E650 /* SymmetricKey+Extensions.swift in Sources */ = {isa = PBXBuildFile; fileRef = 884A45CA27A464C000D6E650 /* SymmetricKey+Extensions.swift */; };
+		884A45CD27A465F500D6E650 /* Client.swift in Sources */ = {isa = PBXBuildFile; fileRef = 884A45CC27A465F500D6E650 /* Client.swift */; };
+		884A45CF27A5402D00D6E650 /* Response.swift in Sources */ = {isa = PBXBuildFile; fileRef = 884A45CE27A5402D00D6E650 /* Response.swift */; };
+/* End PBXBuildFile section */
+
+/* Begin PBXFileReference section */
+		884A45B3279F48C100D6E650 /* Sesame.app */ = {isa = PBXFileReference; explicitFileType = wrapper.application; includeInIndex = 0; path = Sesame.app; sourceTree = BUILT_PRODUCTS_DIR; };
+		884A45B6279F48C100D6E650 /* SesameApp.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = SesameApp.swift; sourceTree = "<group>"; };
+		884A45B8279F48C100D6E650 /* ContentView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ContentView.swift; sourceTree = "<group>"; };
+		884A45BA279F48C300D6E650 /* Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = Assets.xcassets; sourceTree = "<group>"; };
+		884A45BD279F48C300D6E650 /* Preview Assets.xcassets */ = {isa = PBXFileReference; lastKnownFileType = folder.assetcatalog; path = "Preview Assets.xcassets"; sourceTree = "<group>"; };
+		884A45C4279F4BBE00D6E650 /* KeyManagement.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = KeyManagement.swift; sourceTree = "<group>"; };
+		884A45C627A429EF00D6E650 /* ShareSheet.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ShareSheet.swift; sourceTree = "<group>"; };
+		884A45C827A43D7900D6E650 /* ClientState.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ClientState.swift; sourceTree = "<group>"; };
+		884A45CA27A464C000D6E650 /* SymmetricKey+Extensions.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "SymmetricKey+Extensions.swift"; sourceTree = "<group>"; };
+		884A45CC27A465F500D6E650 /* Client.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Client.swift; sourceTree = "<group>"; };
+		884A45CE27A5402D00D6E650 /* Response.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = Response.swift; sourceTree = "<group>"; };
+/* End PBXFileReference section */
+
+/* Begin PBXFrameworksBuildPhase section */
+		884A45B0279F48C100D6E650 /* Frameworks */ = {
+			isa = PBXFrameworksBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXFrameworksBuildPhase section */
+
+/* Begin PBXGroup section */
+		884A45AA279F48C100D6E650 = {
+			isa = PBXGroup;
+			children = (
+				884A45B5279F48C100D6E650 /* Sesame */,
+				884A45B4279F48C100D6E650 /* Products */,
+			);
+			sourceTree = "<group>";
+		};
+		884A45B4279F48C100D6E650 /* Products */ = {
+			isa = PBXGroup;
+			children = (
+				884A45B3279F48C100D6E650 /* Sesame.app */,
+			);
+			name = Products;
+			sourceTree = "<group>";
+		};
+		884A45B5279F48C100D6E650 /* Sesame */ = {
+			isa = PBXGroup;
+			children = (
+				884A45B6279F48C100D6E650 /* SesameApp.swift */,
+				884A45B8279F48C100D6E650 /* ContentView.swift */,
+				884A45CC27A465F500D6E650 /* Client.swift */,
+				884A45CE27A5402D00D6E650 /* Response.swift */,
+				884A45C827A43D7900D6E650 /* ClientState.swift */,
+				884A45C627A429EF00D6E650 /* ShareSheet.swift */,
+				884A45C4279F4BBE00D6E650 /* KeyManagement.swift */,
+				884A45CA27A464C000D6E650 /* SymmetricKey+Extensions.swift */,
+				884A45BA279F48C300D6E650 /* Assets.xcassets */,
+				884A45BC279F48C300D6E650 /* Preview Content */,
+			);
+			path = Sesame;
+			sourceTree = "<group>";
+		};
+		884A45BC279F48C300D6E650 /* Preview Content */ = {
+			isa = PBXGroup;
+			children = (
+				884A45BD279F48C300D6E650 /* Preview Assets.xcassets */,
+			);
+			path = "Preview Content";
+			sourceTree = "<group>";
+		};
+/* End PBXGroup section */
+
+/* Begin PBXNativeTarget section */
+		884A45B2279F48C100D6E650 /* Sesame */ = {
+			isa = PBXNativeTarget;
+			buildConfigurationList = 884A45C1279F48C300D6E650 /* Build configuration list for PBXNativeTarget "Sesame" */;
+			buildPhases = (
+				884A45AF279F48C100D6E650 /* Sources */,
+				884A45B0279F48C100D6E650 /* Frameworks */,
+				884A45B1279F48C100D6E650 /* Resources */,
+			);
+			buildRules = (
+			);
+			dependencies = (
+			);
+			name = Sesame;
+			productName = Sesame;
+			productReference = 884A45B3279F48C100D6E650 /* Sesame.app */;
+			productType = "com.apple.product-type.application";
+		};
+/* End PBXNativeTarget section */
+
+/* Begin PBXProject section */
+		884A45AB279F48C100D6E650 /* Project object */ = {
+			isa = PBXProject;
+			attributes = {
+				BuildIndependentTargetsInParallel = 1;
+				LastSwiftUpdateCheck = 1320;
+				LastUpgradeCheck = 1320;
+				TargetAttributes = {
+					884A45B2279F48C100D6E650 = {
+						CreatedOnToolsVersion = 13.2.1;
+					};
+				};
+			};
+			buildConfigurationList = 884A45AE279F48C100D6E650 /* Build configuration list for PBXProject "Sesame" */;
+			compatibilityVersion = "Xcode 13.0";
+			developmentRegion = en;
+			hasScannedForEncodings = 0;
+			knownRegions = (
+				en,
+				Base,
+			);
+			mainGroup = 884A45AA279F48C100D6E650;
+			productRefGroup = 884A45B4279F48C100D6E650 /* Products */;
+			projectDirPath = "";
+			projectRoot = "";
+			targets = (
+				884A45B2279F48C100D6E650 /* Sesame */,
+			);
+		};
+/* End PBXProject section */
+
+/* Begin PBXResourcesBuildPhase section */
+		884A45B1279F48C100D6E650 /* Resources */ = {
+			isa = PBXResourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				884A45BE279F48C300D6E650 /* Preview Assets.xcassets in Resources */,
+				884A45BB279F48C300D6E650 /* Assets.xcassets in Resources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXResourcesBuildPhase section */
+
+/* Begin PBXSourcesBuildPhase section */
+		884A45AF279F48C100D6E650 /* Sources */ = {
+			isa = PBXSourcesBuildPhase;
+			buildActionMask = 2147483647;
+			files = (
+				884A45CF27A5402D00D6E650 /* Response.swift in Sources */,
+				884A45B9279F48C100D6E650 /* ContentView.swift in Sources */,
+				884A45CD27A465F500D6E650 /* Client.swift in Sources */,
+				884A45CB27A464C000D6E650 /* SymmetricKey+Extensions.swift in Sources */,
+				884A45C927A43D7900D6E650 /* ClientState.swift in Sources */,
+				884A45B7279F48C100D6E650 /* SesameApp.swift in Sources */,
+				884A45C5279F4BBE00D6E650 /* KeyManagement.swift in Sources */,
+				884A45C727A429EF00D6E650 /* ShareSheet.swift in Sources */,
+			);
+			runOnlyForDeploymentPostprocessing = 0;
+		};
+/* End PBXSourcesBuildPhase section */
+
+/* Begin XCBuildConfiguration section */
+		884A45BF279F48C300D6E650 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++17";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = dwarf;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				ENABLE_TESTABILITY = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_DYNAMIC_NO_PIC = NO;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_OPTIMIZATION_LEVEL = 0;
+				GCC_PREPROCESSOR_DEFINITIONS = (
+					"DEBUG=1",
+					"$(inherited)",
+				);
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.2;
+				MTL_ENABLE_DEBUG_INFO = INCLUDE_SOURCE;
+				MTL_FAST_MATH = YES;
+				ONLY_ACTIVE_ARCH = YES;
+				SDKROOT = iphoneos;
+				SWIFT_ACTIVE_COMPILATION_CONDITIONS = DEBUG;
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+			};
+			name = Debug;
+		};
+		884A45C0279F48C300D6E650 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ALWAYS_SEARCH_USER_PATHS = NO;
+				CLANG_ANALYZER_NONNULL = YES;
+				CLANG_ANALYZER_NUMBER_OBJECT_CONVERSION = YES_AGGRESSIVE;
+				CLANG_CXX_LANGUAGE_STANDARD = "gnu++17";
+				CLANG_CXX_LIBRARY = "libc++";
+				CLANG_ENABLE_MODULES = YES;
+				CLANG_ENABLE_OBJC_ARC = YES;
+				CLANG_ENABLE_OBJC_WEAK = YES;
+				CLANG_WARN_BLOCK_CAPTURE_AUTORELEASING = YES;
+				CLANG_WARN_BOOL_CONVERSION = YES;
+				CLANG_WARN_COMMA = YES;
+				CLANG_WARN_CONSTANT_CONVERSION = YES;
+				CLANG_WARN_DEPRECATED_OBJC_IMPLEMENTATIONS = YES;
+				CLANG_WARN_DIRECT_OBJC_ISA_USAGE = YES_ERROR;
+				CLANG_WARN_DOCUMENTATION_COMMENTS = YES;
+				CLANG_WARN_EMPTY_BODY = YES;
+				CLANG_WARN_ENUM_CONVERSION = YES;
+				CLANG_WARN_INFINITE_RECURSION = YES;
+				CLANG_WARN_INT_CONVERSION = YES;
+				CLANG_WARN_NON_LITERAL_NULL_CONVERSION = YES;
+				CLANG_WARN_OBJC_IMPLICIT_RETAIN_SELF = YES;
+				CLANG_WARN_OBJC_LITERAL_CONVERSION = YES;
+				CLANG_WARN_OBJC_ROOT_CLASS = YES_ERROR;
+				CLANG_WARN_QUOTED_INCLUDE_IN_FRAMEWORK_HEADER = YES;
+				CLANG_WARN_RANGE_LOOP_ANALYSIS = YES;
+				CLANG_WARN_STRICT_PROTOTYPES = YES;
+				CLANG_WARN_SUSPICIOUS_MOVE = YES;
+				CLANG_WARN_UNGUARDED_AVAILABILITY = YES_AGGRESSIVE;
+				CLANG_WARN_UNREACHABLE_CODE = YES;
+				CLANG_WARN__DUPLICATE_METHOD_MATCH = YES;
+				COPY_PHASE_STRIP = NO;
+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
+				ENABLE_NS_ASSERTIONS = NO;
+				ENABLE_STRICT_OBJC_MSGSEND = YES;
+				GCC_C_LANGUAGE_STANDARD = gnu11;
+				GCC_NO_COMMON_BLOCKS = YES;
+				GCC_WARN_64_TO_32_BIT_CONVERSION = YES;
+				GCC_WARN_ABOUT_RETURN_TYPE = YES_ERROR;
+				GCC_WARN_UNDECLARED_SELECTOR = YES;
+				GCC_WARN_UNINITIALIZED_AUTOS = YES_AGGRESSIVE;
+				GCC_WARN_UNUSED_FUNCTION = YES;
+				GCC_WARN_UNUSED_VARIABLE = YES;
+				IPHONEOS_DEPLOYMENT_TARGET = 15.2;
+				MTL_ENABLE_DEBUG_INFO = NO;
+				MTL_FAST_MATH = YES;
+				SDKROOT = iphoneos;
+				SWIFT_COMPILATION_MODE = wholemodule;
+				SWIFT_OPTIMIZATION_LEVEL = "-O";
+				VALIDATE_PRODUCT = YES;
+			};
+			name = Release;
+		};
+		884A45C2279F48C300D6E650 /* Debug */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_ASSET_PATHS = "\"Sesame/Preview Content\"";
+				DEVELOPMENT_TEAM = H8WR4M6QQ4;
+				ENABLE_PREVIEWS = YES;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_KEY_UIApplicationSceneManifest_Generation = YES;
+				INFOPLIST_KEY_UIApplicationSupportsIndirectInputEvents = YES;
+				INFOPLIST_KEY_UILaunchScreen_Generation = YES;
+				INFOPLIST_KEY_UISupportedInterfaceOrientations = UIInterfaceOrientationPortrait;
+				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPad = "UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
+				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPhone = "UIInterfaceOrientationPortrait UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = de.christophhagen.Sesame;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = 1;
+			};
+			name = Debug;
+		};
+		884A45C3279F48C300D6E650 /* Release */ = {
+			isa = XCBuildConfiguration;
+			buildSettings = {
+				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				ASSETCATALOG_COMPILER_GLOBAL_ACCENT_COLOR_NAME = AccentColor;
+				CODE_SIGN_STYLE = Automatic;
+				CURRENT_PROJECT_VERSION = 1;
+				DEVELOPMENT_ASSET_PATHS = "\"Sesame/Preview Content\"";
+				DEVELOPMENT_TEAM = H8WR4M6QQ4;
+				ENABLE_PREVIEWS = YES;
+				GENERATE_INFOPLIST_FILE = YES;
+				INFOPLIST_KEY_UIApplicationSceneManifest_Generation = YES;
+				INFOPLIST_KEY_UIApplicationSupportsIndirectInputEvents = YES;
+				INFOPLIST_KEY_UILaunchScreen_Generation = YES;
+				INFOPLIST_KEY_UISupportedInterfaceOrientations = UIInterfaceOrientationPortrait;
+				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPad = "UIInterfaceOrientationPortrait UIInterfaceOrientationPortraitUpsideDown UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
+				INFOPLIST_KEY_UISupportedInterfaceOrientations_iPhone = "UIInterfaceOrientationPortrait UIInterfaceOrientationLandscapeLeft UIInterfaceOrientationLandscapeRight";
+				LD_RUNPATH_SEARCH_PATHS = (
+					"$(inherited)",
+					"@executable_path/Frameworks",
+				);
+				MARKETING_VERSION = 1.0;
+				PRODUCT_BUNDLE_IDENTIFIER = de.christophhagen.Sesame;
+				PRODUCT_NAME = "$(TARGET_NAME)";
+				SWIFT_EMIT_LOC_STRINGS = YES;
+				SWIFT_VERSION = 5.0;
+				TARGETED_DEVICE_FAMILY = 1;
+			};
+			name = Release;
+		};
+/* End XCBuildConfiguration section */
+
+/* Begin XCConfigurationList section */
+		884A45AE279F48C100D6E650 /* Build configuration list for PBXProject "Sesame" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				884A45BF279F48C300D6E650 /* Debug */,
+				884A45C0279F48C300D6E650 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+		884A45C1279F48C300D6E650 /* Build configuration list for PBXNativeTarget "Sesame" */ = {
+			isa = XCConfigurationList;
+			buildConfigurations = (
+				884A45C2279F48C300D6E650 /* Debug */,
+				884A45C3279F48C300D6E650 /* Release */,
+			);
+			defaultConfigurationIsVisible = 0;
+			defaultConfigurationName = Release;
+		};
+/* End XCConfigurationList section */
+	};
+	rootObject = 884A45AB279F48C100D6E650 /* Project object */;
+}
diff --git a/Sesame.xcodeproj/project.xcworkspace/contents.xcworkspacedata b/Sesame.xcodeproj/project.xcworkspace/contents.xcworkspacedata
new file mode 100644
index 0000000..919434a
--- /dev/null
+++ b/Sesame.xcodeproj/project.xcworkspace/contents.xcworkspacedata
@@ -0,0 +1,7 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:">
+   </FileRef>
+</Workspace>
diff --git a/Sesame.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist b/Sesame.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
new file mode 100644
index 0000000..18d9810
--- /dev/null
+++ b/Sesame.xcodeproj/project.xcworkspace/xcshareddata/IDEWorkspaceChecks.plist
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>IDEDidComputeMac32BitWarning</key>
+	<true/>
+</dict>
+</plist>
diff --git a/Sesame.xcodeproj/project.xcworkspace/xcuserdata/imac.xcuserdatad/UserInterfaceState.xcuserstate b/Sesame.xcodeproj/project.xcworkspace/xcuserdata/imac.xcuserdatad/UserInterfaceState.xcuserstate
new file mode 100644
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diff --git a/Sesame.xcodeproj/xcuserdata/imac.xcuserdatad/xcschemes/xcschememanagement.plist b/Sesame.xcodeproj/xcuserdata/imac.xcuserdatad/xcschemes/xcschememanagement.plist
new file mode 100644
index 0000000..5ac8256
--- /dev/null
+++ b/Sesame.xcodeproj/xcuserdata/imac.xcuserdatad/xcschemes/xcschememanagement.plist
@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>SchemeUserState</key>
+	<dict>
+		<key>Sesame.xcscheme_^#shared#^_</key>
+		<dict>
+			<key>orderHint</key>
+			<integer>0</integer>
+		</dict>
+	</dict>
+</dict>
+</plist>
diff --git a/Sesame/Assets.xcassets/AccentColor.colorset/Contents.json b/Sesame/Assets.xcassets/AccentColor.colorset/Contents.json
new file mode 100644
index 0000000..eb87897
--- /dev/null
+++ b/Sesame/Assets.xcassets/AccentColor.colorset/Contents.json
@@ -0,0 +1,11 @@
+{
+  "colors" : [
+    {
+      "idiom" : "universal"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/Sesame/Assets.xcassets/AppIcon.appiconset/Contents.json b/Sesame/Assets.xcassets/AppIcon.appiconset/Contents.json
new file mode 100644
index 0000000..9221b9b
--- /dev/null
+++ b/Sesame/Assets.xcassets/AppIcon.appiconset/Contents.json
@@ -0,0 +1,98 @@
+{
+  "images" : [
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "2x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "iphone",
+      "scale" : "3x",
+      "size" : "60x60"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "20x20"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "29x29"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "40x40"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "1x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "76x76"
+    },
+    {
+      "idiom" : "ipad",
+      "scale" : "2x",
+      "size" : "83.5x83.5"
+    },
+    {
+      "idiom" : "ios-marketing",
+      "scale" : "1x",
+      "size" : "1024x1024"
+    }
+  ],
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/Sesame/Assets.xcassets/Contents.json b/Sesame/Assets.xcassets/Contents.json
new file mode 100644
index 0000000..73c0059
--- /dev/null
+++ b/Sesame/Assets.xcassets/Contents.json
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/Sesame/Client.swift b/Sesame/Client.swift
new file mode 100644
index 0000000..7e51653
--- /dev/null
+++ b/Sesame/Client.swift
@@ -0,0 +1,105 @@
+import Foundation
+import CryptoKit
+
+struct Client {
+    
+    let server: URL
+    
+    private let delegate = NeverCacheDelegate()
+    
+    init(server: URL) {
+        self.server = server
+    }
+    
+    private enum RequestReponse: Error {
+        case requestFailed
+        case unknownResponse
+        case success(UInt8)
+    }
+
+    func deviceStatus() async throws -> ClientState {
+        let url = server.appendingPathComponent("status")
+        let request = URLRequest(url: url, cachePolicy: .reloadIgnoringLocalCacheData)
+        let response = await integerReponse(to: request)
+        switch response {
+        case .requestFailed:
+            return .statusRequestFailed
+        case .unknownResponse:
+            return .unknownDeviceStatus
+        case .success(let int):
+            switch int {
+            case 0:
+                return .deviceDisconnected
+            case 1:
+                return .deviceConnected
+            default:
+                print("Unexpected device status '\(int)'")
+                return .unknownDeviceStatus
+            }
+        }
+    }
+    
+    func keyResponse(key: SymmetricKey, id: Int) async throws -> ClientState {
+        let url = server.appendingPathComponent("key/\(id)")
+        var request = URLRequest(url: url)
+        request.httpBody = key.data
+        request.httpMethod = "POST"
+        let response = await integerReponse(to: request)
+        switch response {
+        case .requestFailed:
+            return .statusRequestFailed
+        case .unknownResponse:
+            return .unknownDeviceStatus
+        case .success(let int):
+            guard let status = KeyResult(rawValue: int) else {
+                print("Invalid key response: \(int)")
+                return .unknownDeviceStatus
+            }
+            return ClientState(keyResult: status)
+        }
+    }
+    
+    private func fulfill(_ request: URLRequest) async -> Result<Data, RequestReponse> {
+        do {
+            let (data, response) = try await URLSession.shared.data(for: request)
+            guard let code = (response as? HTTPURLResponse)?.statusCode else {
+                print("No response from server")
+                return .failure(.requestFailed)
+            }
+            guard code == 200 else {
+                print("Invalid server response \(code)")
+                return .failure(.requestFailed)
+            }
+            return .success(data)
+        } catch {
+            print("Request failed: \(error)")
+            return .failure(.requestFailed)
+        }
+    }
+    
+    private func integerReponse(to request: URLRequest) async -> RequestReponse {
+        let response = await fulfill(request)
+        switch response {
+        case .failure(let cause):
+            return cause
+        case .success(let data):
+            guard let string = String(data: data, encoding: .utf8) else {
+                print("Unexpected device status data: \([UInt8](data))")
+                return .unknownResponse
+            }
+            guard let int = UInt8(string) else {
+                print("Unexpected device status '\(string)'")
+                return .unknownResponse
+            }
+            return .success(int)
+        }
+    }
+    
+}
+
+class NeverCacheDelegate: NSObject, NSURLConnectionDataDelegate {
+    
+    func connection(_ connection: NSURLConnection, willCacheResponse cachedResponse: CachedURLResponse) -> CachedURLResponse? {
+        return nil
+    }
+}
diff --git a/Sesame/ClientState.swift b/Sesame/ClientState.swift
new file mode 100644
index 0000000..a25b25d
--- /dev/null
+++ b/Sesame/ClientState.swift
@@ -0,0 +1,137 @@
+import Foundation
+import SwiftUI
+
+enum ClientState {
+    
+    /// The initial state after app launch
+    case initial
+    
+    /// There are no keys stored locally on the client. New keys must be generated before use.
+    case noKeysAvailable
+    
+    /// New keys have been generated and can now be transmitted to the device.
+    case newKeysGenerated
+    
+    /// The device status could not be determined
+    case statusRequestFailed
+    
+    /// The status received from the server could not be decoded
+    case unknownDeviceStatus
+    
+    /// The remote device is not connected (no socket opened)
+    case deviceDisconnected
+    
+    /// The device is connected and ready to receive a key
+    case deviceConnected
+    
+    /// The key is being transmitted and a response is awaited
+    case waitingForResponse
+    
+    /// The transmitted key was rejected (multiple possible reasons)
+    case keyRejected
+    
+    /// Internal errors with the implementation
+    case internalError
+    
+    /// The configuration of the devices doesn't match
+    case configurationError
+
+    /// The device responded that the opening action was started
+    case openSesame
+    
+    /// All keys have been used
+    case allKeysUsed
+    
+    var canSendKey: Bool {
+        switch self {
+        case .deviceConnected, .openSesame, .keyRejected:
+            return true
+        default:
+            return false
+        }
+    }
+    
+    init(keyResult: KeyResult) {
+        switch keyResult {
+        case .textReceived, .unexpectedSocketEvent, .unknownDeviceError:
+            self = .unknownDeviceStatus
+        case .invalidPayloadSize, .invalidKeyIndex, .invalidKey:
+            self = .configurationError
+        case .keyAlreadyUsed, .keyWasSkipped:
+            self = .keyRejected
+        case .keyAccepted:
+            self = .openSesame
+        case .noBodyData, .corruptkeyData:
+            self = .internalError
+        case .deviceNotConnected, .deviceTimedOut:
+            self = .deviceDisconnected
+        }
+    }
+    
+    var description: String {
+        switch self {
+        case .initial:
+            return "Checking state..."
+        case .noKeysAvailable:
+            return "No keys found"
+        case .newKeysGenerated:
+            return "New keys generated"
+        case .deviceDisconnected:
+            return "Device not connected"
+        case .statusRequestFailed:
+            return "Unable to get device status"
+        case .unknownDeviceStatus:
+            return "Unknown device status"
+        case .deviceConnected:
+            return "Device connected"
+        case .waitingForResponse:
+            return "Waiting for response"
+        case .internalError:
+            return "An internal error occured"
+        case .configurationError:
+            return "Configuration error"
+    
+        case .allKeysUsed:
+            return "No fresh keys available"
+        case .keyRejected:
+            return "The key was rejected"
+        case .openSesame:
+            return "Unlocked"
+        }
+    }
+    
+    var openButtonText: String {
+        switch self {
+        case .initial, .statusRequestFailed, .unknownDeviceStatus, .deviceDisconnected, .newKeysGenerated, .configurationError, .internalError:
+            return "Connect"
+        case .allKeysUsed, .noKeysAvailable:
+            return "Disabled"
+        case .deviceConnected, .keyRejected, .openSesame:
+            return "Unlock"
+        case .waitingForResponse:
+            return "Unlocking..."
+        }
+    }
+    
+    var openButtonColor: Color {
+        switch self {
+        case .initial, .newKeysGenerated, .statusRequestFailed, .waitingForResponse:
+            return .yellow
+        case .noKeysAvailable, .allKeysUsed, .deviceDisconnected, .unknownDeviceStatus, .keyRejected, .configurationError, .internalError:
+            return .red
+        case .deviceConnected, .openSesame:
+            return .green
+        }
+    }
+    
+    var openActionIsEnabled: Bool {
+        switch self {
+        case .allKeysUsed, .noKeysAvailable, .waitingForResponse:
+            return false
+        default:
+            return true
+        }
+    }
+    
+    
+}
diff --git a/Sesame/ContentView.swift b/Sesame/ContentView.swift
new file mode 100644
index 0000000..2396a3a
--- /dev/null
+++ b/Sesame/ContentView.swift
@@ -0,0 +1,164 @@
+import SwiftUI
+import CryptoKit
+
+let keyManager = try! KeyManagement()
+let server = Client(server: URL(string: "https://christophhagen.de/sesame/")!)
+
+struct ContentView: View {
+    
+    @State var state: ClientState = .initial
+    
+    var canShareKey = false
+    
+    @State var showNewKeyWarning = false
+    
+    @State var showKeyGenerationFailedWarning = false
+    
+    @State var showShareSheetForNewKeys = false
+    
+    @State var activeRequestCount = 0
+    
+    var isPerformingRequests: Bool {
+        activeRequestCount > 0
+    }
+    
+    var keyText: String {
+        let totalKeys = keyManager.numberOfKeys
+        guard totalKeys > 0 else {
+            return "No keys available"
+        }
+        let unusedKeys = keyManager.unusedKeyCount
+        guard unusedKeys > 0 else {
+            return "All keys used"
+        }
+        return "\(totalKeys - unusedKeys) / \(totalKeys) keys used"
+    }
+    
+    private let buttonWidth: CGFloat = 200
+    
+    private let topButtonHeight: CGFloat = 60
+    
+    var body: some View {
+        VStack(spacing: 20) {
+            Text(keyText)
+            Button("Generate new keys", action: {
+                showNewKeyWarning = true
+                print("Key regeneration requested")
+            })
+                .padding()
+                .frame(width: buttonWidth, height: topButtonHeight)
+                .background(.blue)
+                .foregroundColor(.white)
+                .cornerRadius(topButtonHeight / 2)
+            Button("Share one-time key", action: shareKey)
+                .padding()
+                .frame(width: buttonWidth, height: topButtonHeight)
+                .background(.mint)
+                .foregroundColor(.white)
+                .cornerRadius(topButtonHeight / 2)
+                .disabled(!canShareKey)
+            
+            Spacer()
+            HStack {
+                if isPerformingRequests {
+                    ProgressView()
+                        .progressViewStyle(CircularProgressViewStyle())
+                }
+                Text(state.description)
+                    .padding()
+            }
+            Button(state.openButtonText, action: mainButtonPressed)
+                .frame(width: buttonWidth, height: 80, alignment: .center)
+                .background(state.openButtonColor)
+                .cornerRadius(100)
+                .foregroundColor(.white)
+                .font(.title2)
+                .disabled(!state.openActionIsEnabled)
+        }
+        .padding(20)
+        .onAppear {
+            checkInitialDeviceStatus()
+        }.alert(isPresented: $showKeyGenerationFailedWarning) {
+            Alert(title: Text("The keys could not be generated"),
+                  message: Text("All previous keys will be deleted and the lock will be blocked. Are you sure?"),
+                  dismissButton: .default(Text("Okay")))
+        }.shareSheet(isPresented: $showShareSheetForNewKeys, items: [keyManager.exportFile])
+            .alert(isPresented: $showNewKeyWarning) {
+                Alert(title: Text("Generate new keys"),
+                      message: Text("All previous keys will be deleted and the lock will be blocked. Are you sure?"),
+                      primaryButton: .destructive(Text("Generate"), action: regenerateKeys),
+                      secondaryButton: .cancel())
+            }
+    }
+    
+    func mainButtonPressed() {
+        print("Main button pressed")
+        if state.canSendKey {
+            sendKey()
+        } else {
+            checkInitialDeviceStatus()
+        }
+    }
+    
+    func sendKey() {
+        guard let key = keyManager.useNextKey() else {
+            state = .allKeysUsed
+            return
+        }
+        state = .waitingForResponse
+        activeRequestCount += 1
+        print("Sending key \(key.id)")
+        Task {
+            let newState = try await server.keyResponse(key: key.key, id: key.id)
+            activeRequestCount -= 1
+            state = newState
+        }
+    }
+    
+    func checkInitialDeviceStatus() {
+        print("Checking device status")
+        Task {
+            do {
+                activeRequestCount += 1
+                let newState = try await server.deviceStatus()
+                activeRequestCount -= 1
+                print("Device status: \(newState)")
+                switch newState {
+                case .noKeysAvailable, .allKeysUsed:
+                    return
+                default:
+                    state = newState
+                }
+            } catch {
+                print("Failed to get device status: \(error)")
+                state = .statusRequestFailed
+            }
+        }
+    }
+    
+    func regenerateKeys() {
+        print("Regenerate keys")
+        do {
+            try keyManager.regenerateKeys()
+            state = .newKeysGenerated
+            showKeyGenerationFailedWarning = false
+            showShareSheetForNewKeys = true
+            checkInitialDeviceStatus()
+        } catch {
+            state = .noKeysAvailable
+            showKeyGenerationFailedWarning = true
+            showShareSheetForNewKeys = false
+        }
+    }
+    
+    func shareKey() {
+        
+    }
+}
+
+struct ContentView_Previews: PreviewProvider {
+    static var previews: some View {
+        ContentView()
+            .previewDevice("iPhone 8")
+    }
+}
diff --git a/Sesame/KeyManagement.swift b/Sesame/KeyManagement.swift
new file mode 100644
index 0000000..111b11f
--- /dev/null
+++ b/Sesame/KeyManagement.swift
@@ -0,0 +1,118 @@
+import Foundation
+import CryptoKit
+import SwiftUI
+
+final class KeyManagement {
+    
+    static let securityKeySize: SymmetricKeySize = .bits128
+    
+    enum KeyError: Error {
+        /// Keys which are already in use can't be exported
+        case exportAttemptOfUsedKeys
+    }
+    
+    static var documentsDirectory: URL {
+        let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
+        return paths[0]
+    }
+    
+    private let keyFile = KeyManagement.documentsDirectory.appendingPathComponent("keys")
+    
+    let exportFile = KeyManagement.documentsDirectory.appendingPathComponent("export.cpp")
+    
+    private var keys: [(key: SymmetricKey, used: Bool)] {
+        didSet {
+            do {
+                try saveKeys()
+            } catch {
+                print("Failed to save changed keys: \(error)")
+            }
+        }
+    }
+    
+    var numberOfKeys: Int {
+        keys.count
+    }
+    
+    var hasUsedKeys: Bool {
+        keys.contains { $0.used }
+    }
+    
+    var hasUnusedKeys: Bool {
+        unusedKeyCount > 0
+    }
+    
+    var unusedKeyCount: Int {
+        guard let id = nextKeyId else {
+            return 0
+        }
+        return keys.count - id + 1
+    }
+    
+    var usedKeyCount: Int {
+        nextKeyId ?? keys.count
+    }
+    
+    var lastKeyId: Int? {
+        keys.lastIndex { $0.used }
+    }
+    
+    var nextKeyId: Int? {
+        let index = lastKeyId ?? -1 + 1
+        guard index < keys.count else {
+            return nil
+        }
+        return index
+    }
+    
+    init() throws {
+        guard FileManager.default.fileExists(atPath: keyFile.path) else {
+            self.keys = []
+            return
+        }
+        let content = try String(contentsOf: keyFile)
+        self.keys = content.components(separatedBy: "\n")
+            .enumerated().compactMap { (index, line) -> (SymmetricKey, Bool)? in
+                let parts = line.components(separatedBy: ":")
+                guard parts.count == 2 else {
+                    return nil
+                }
+                let keyData = Data(base64Encoded: parts[0])!
+                return (SymmetricKey(data: keyData), parts[1] != "0")
+            }
+        print("\(unusedKeyCount) / \(keys.count) keys remaining")
+    }
+    
+    func useNextKey() -> (key: SymmetricKey, id: Int)? {
+        guard let index = nextKeyId else {
+            return nil
+        }
+        let key = keys[index].key
+        keys[index].used = true
+        return (key, index)
+    }
+    
+    func regenerateKeys(count: Int = 100) throws {
+        self.keys = Self.generateKeys(count: count)
+            .map { ($0, false) }
+        let keyString = keys.map { $0.key.codeString }.joined(separator: "\n")
+        try keyString.write(to: exportFile, atomically: false, encoding: .utf8)
+    }
+    
+    private func saveKeys() throws {
+        let content = keys.map { key, used -> String in
+            let keyString = key.withUnsafeBytes {
+                return Data(Array($0)).base64EncodedString()
+            }
+            return keyString + ":" + (used ? "1" : "0")
+        }.joined(separator: "\n")
+        try content.write(to: keyFile, atomically: true, encoding: .utf8)
+        print("Keys saved")
+    }
+    
+    static func generateKeys(count: Int = 100) -> [SymmetricKey] {
+        (0..<count).map { _ in
+            SymmetricKey(size: securityKeySize)
+        }
+    }
+}
diff --git a/Sesame/Preview Content/Preview Assets.xcassets/Contents.json b/Sesame/Preview Content/Preview Assets.xcassets/Contents.json
new file mode 100644
index 0000000..73c0059
--- /dev/null
+++ b/Sesame/Preview Content/Preview Assets.xcassets/Contents.json	
@@ -0,0 +1,6 @@
+{
+  "info" : {
+    "author" : "xcode",
+    "version" : 1
+  }
+}
diff --git a/Sesame/Response.swift b/Sesame/Response.swift
new file mode 100644
index 0000000..44dcbf7
--- /dev/null
+++ b/Sesame/Response.swift
@@ -0,0 +1,80 @@
+import Foundation
+
+/**
+ A result from sending a key to the device.
+ */
+enum KeyResult: UInt8 {
+    
+    /// Text content was received, although binary data was expected
+    case textReceived = 1
+    
+    /// A socket event on the device was unexpected (not binary data)
+    case unexpectedSocketEvent = 2
+    
+    /// The size of the payload (key id + key data, or just key) was invalid
+    case invalidPayloadSize = 3
+    
+    /// The index of the key was out of bounds
+    case invalidKeyIndex = 4
+    
+    /// The transmitted key data did not match the expected key
+    case invalidKey = 5
+    
+    /// The key has been previously used and is no longer valid
+    case keyAlreadyUsed = 6
+    
+    /// A later key has been used, invalidating this key (to prevent replay attacks after blocked communication)
+    case keyWasSkipped = 7
+    
+    /// The key was accepted by the device, and the door will be opened
+    case keyAccepted = 8
+    
+    /// The device produced an unknown error
+    case unknownDeviceError = 9
+    
+    /// The request did not contain body data with the key
+    case noBodyData = 10
+    
+    /// The body data could not be read
+    case corruptkeyData = 11
+    
+    /// The device is not connected
+    case deviceNotConnected = 12
+    
+    /// The device did not respond within the timeout
+    case deviceTimedOut = 13
+}
+
+extension KeyResult: CustomStringConvertible {
+    
+    var description: String {
+        switch self {
+        case .invalidKeyIndex:
+            return "Invalid key id (too large)"
+        case .noBodyData:
+            return "No body data included in the request"
+        case .invalidPayloadSize:
+            return "Invalid key size"
+        case .corruptkeyData:
+            return "Key data corrupted"
+        case .deviceNotConnected:
+            return "Device not connected"
+        case .textReceived:
+            return "The device received unexpected text"
+        case .unexpectedSocketEvent:
+            return "Unexpected socket event for the device"
+        case .invalidKey:
+            return "The transmitted key was not correct"
+        case .keyAlreadyUsed:
+            return "The transmitted key was already used"
+        case .keyWasSkipped:
+            return "A newer key was already used"
+        case .keyAccepted:
+            return "Key successfully sent"
+        case .unknownDeviceError:
+            return "The device experienced an unknown error"
+        case .deviceTimedOut:
+            return "The device did not respond"
+        }
+    }
+}
diff --git a/Sesame/SesameApp.swift b/Sesame/SesameApp.swift
new file mode 100644
index 0000000..bd71bbc
--- /dev/null
+++ b/Sesame/SesameApp.swift
@@ -0,0 +1,17 @@
+//
+//  SesameApp.swift
+//  Sesame
+//
+//  Created by iMac on 24.01.22.
+//
+
+import SwiftUI
+
+@main
+struct SesameApp: App {
+    var body: some Scene {
+        WindowGroup {
+            ContentView()
+        }
+    }
+}
diff --git a/Sesame/ShareSheet.swift b/Sesame/ShareSheet.swift
new file mode 100644
index 0000000..fc9fc1f
--- /dev/null
+++ b/Sesame/ShareSheet.swift
@@ -0,0 +1,21 @@
+import SwiftUI
+
+extension UIApplication {
+    
+    static let keyWindow = keyWindowScene?.windows.filter(\.isKeyWindow).first
+    static let keyWindowScene = shared.connectedScenes.first { $0.activationState == .foregroundActive } as? UIWindowScene
+    
+}
+
+extension View {
+    
+    func shareSheet(isPresented: Binding<Bool>, items: [Any]) -> some View {
+        guard isPresented.wrappedValue else { return self }
+        let activityViewController = UIActivityViewController(activityItems: items, applicationActivities: nil)
+        let presentedViewController = UIApplication.keyWindow?.rootViewController?.presentedViewController ?? UIApplication.keyWindow?.rootViewController
+        activityViewController.completionWithItemsHandler = { _, _, _, _ in isPresented.wrappedValue = false }
+        presentedViewController?.present(activityViewController, animated: true)
+        return self
+    }
+    
+}
diff --git a/Sesame/SymmetricKey+Extensions.swift b/Sesame/SymmetricKey+Extensions.swift
new file mode 100644
index 0000000..d977084
--- /dev/null
+++ b/Sesame/SymmetricKey+Extensions.swift
@@ -0,0 +1,21 @@
+import Foundation
+import CryptoKit
+
+extension SymmetricKey {
+    
+    var data: Data {
+        withUnsafeBytes { Data(Array($0)) }
+    }
+    
+    var base64: String {
+        data.base64EncodedString()
+    }
+    
+    var codeString: String {
+        "    {" +
+        withUnsafeBytes {
+            return Data(Array($0))
+        }.map(String.init).joined(separator: ", ") +
+        "},"
+    }
+}