rust -> c -> swift -> objc -> js bridge works

.gitignore

+# rust output file
+*.a
+
 # OSX
 #
 .DS_Store

ios/EthkeyBridge.swift

+//
+//  EthkeyBridge.swift
+//  NativeSigner
+//
+//  Created by Marek Kotewicz on 19/02/2017.
+//  Copyright © 2017 Facebook. All rights reserved.
+//
+
+import Foundation
+
+@objc(EthkeyBridge)
+class EthkeyBridge: NSObject {
+	@objc func show(_ name: String) {
+		NSLog("%@", name);
+	}
+	
+	@objc func brainWallet(_ seed: NSString, callback: RCTResponseSenderBlock) -> Void {
+		let s = tmp_string()
+		let tmp_s = String.fromStringPtr(ptr: s!.pointee)
+		callback([tmp_s as NSString])
+	}
+}

ios/NativeSigner-Bridging-Header.h

+//
+//  Use this file to import your target's public headers that you would like to expose to Swift.
+//
+
+#import <React/RCTBridgeModule.h>
+#import "signer.h"

ios/NativeSigner.xcodeproj/project.pbxproj

@@ -26,6 +26,10 @@
 		832341BD1AAA6AB300B99B32 /* libRCTText.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 832341B51AAA6A8300B99B32 /* libRCTText.a */; };
 		8E82ABE6A351418899C5974A /* libRCTCamera.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 0462DF64F1D24C8E8B6E90B1 /* libRCTCamera.a */; };
 		AA0792CD4D7F417B8C8D17CF /* libRNRandomBytes.a in Frameworks */ = {isa = PBXBuildFile; fileRef = 24A2115276994AD5AED9321A /* libRNRandomBytes.a */; };
+		EA529FD21E5A00B2004DF471 /* EthkeyBridge.m in Sources */ = {isa = PBXBuildFile; fileRef = EA529FD11E5A00B2004DF471 /* EthkeyBridge.m */; };
+		EA529FF31E5A4261004DF471 /* String.swift in Sources */ = {isa = PBXBuildFile; fileRef = EA529FF21E5A4261004DF471 /* String.swift */; };
+		EA529FF51E5A4EF2004DF471 /* EthkeyBridge.swift in Sources */ = {isa = PBXBuildFile; fileRef = EA529FF41E5A4EF2004DF471 /* EthkeyBridge.swift */; };
+		EA529FFA1E5A52AD004DF471 /* libsigner.a in Frameworks */ = {isa = PBXBuildFile; fileRef = EA529FF91E5A52AD004DF471 /* libsigner.a */; };
 		EAB49CE81E482E090066C283 /* libRNRandomBytes.a in Frameworks */ = {isa = PBXBuildFile; fileRef = EAB49CE71E482DBF0066C283 /* libRNRandomBytes.a */; };
 /* End PBXBuildFile section */
 
@@ -255,6 +259,13 @@
 		78C398B01ACF4ADC00677621 /* RCTLinking.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = RCTLinking.xcodeproj; path = "../node_modules/react-native/Libraries/LinkingIOS/RCTLinking.xcodeproj"; sourceTree = "<group>"; };
 		821AED75338B40468A2A8B7A /* RCTCamera.xcodeproj */ = {isa = PBXFileReference; explicitFileType = undefined; fileEncoding = 9; includeInIndex = 0; lastKnownFileType = "wrapper.pb-project"; name = RCTCamera.xcodeproj; path = "../node_modules/react-native-camera/ios/RCTCamera.xcodeproj"; sourceTree = "<group>"; };
 		832341B01AAA6A8300B99B32 /* RCTText.xcodeproj */ = {isa = PBXFileReference; lastKnownFileType = "wrapper.pb-project"; name = RCTText.xcodeproj; path = "../node_modules/react-native/Libraries/Text/RCTText.xcodeproj"; sourceTree = "<group>"; };
+		EA529FD11E5A00B2004DF471 /* EthkeyBridge.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; name = EthkeyBridge.m; path = NativeSigner/EthkeyBridge.m; sourceTree = "<group>"; };
+		EA529FF01E5A3FAB004DF471 /* signer.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = signer.h; sourceTree = "<group>"; };
+		EA529FF11E5A4260004DF471 /* NativeSigner-Bridging-Header.h */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.c.h; path = "NativeSigner-Bridging-Header.h"; sourceTree = "<group>"; };
+		EA529FF21E5A4261004DF471 /* String.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; name = String.swift; path = NativeSigner/String.swift; sourceTree = "<group>"; };
+		EA529FF41E5A4EF2004DF471 /* EthkeyBridge.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = EthkeyBridge.swift; sourceTree = "<group>"; };
+		EA529FF71E5A525F004DF471 /* libsigner.a */ = {isa = PBXFileReference; lastKnownFileType = archive.ar; name = libsigner.a; path = ../rust/signer/libsigner.a; sourceTree = "<group>"; };
+		EA529FF91E5A52AD004DF471 /* libsigner.a */ = {isa = PBXFileReference; lastKnownFileType = archive.ar; name = libsigner.a; path = ../rust/signer/libsigner.a; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -277,6 +288,7 @@
 				00C302E71ABCBA2D00DB3ED1 /* libRCTGeolocation.a in Frameworks */,
 				00C302E81ABCBA2D00DB3ED1 /* libRCTImage.a in Frameworks */,
 				133E29F31AD74F7200F7D852 /* libRCTLinking.a in Frameworks */,
+				EA529FFA1E5A52AD004DF471 /* libsigner.a in Frameworks */,
 				00C302E91ABCBA2D00DB3ED1 /* libRCTNetwork.a in Frameworks */,
 				139105C61AF99C1200B5F7CC /* libRCTSettings.a in Frameworks */,
 				832341BD1AAA6AB300B99B32 /* libRCTText.a in Frameworks */,
@@ -370,13 +382,19 @@
 		13B07FAE1A68108700A75B9A /* NativeSigner */ = {
 			isa = PBXGroup;
 			children = (
+				EA529FF91E5A52AD004DF471 /* libsigner.a */,
 				008F07F21AC5B25A0029DE68 /* main.jsbundle */,
 				13B07FAF1A68108700A75B9A /* AppDelegate.h */,
 				13B07FB01A68108700A75B9A /* AppDelegate.m */,
+				EA529FD11E5A00B2004DF471 /* EthkeyBridge.m */,
+				EA529FF21E5A4261004DF471 /* String.swift */,
+				EA529FF41E5A4EF2004DF471 /* EthkeyBridge.swift */,
+				EA529FF01E5A3FAB004DF471 /* signer.h */,
 				13B07FB51A68108700A75B9A /* Images.xcassets */,
 				13B07FB61A68108700A75B9A /* Info.plist */,
 				13B07FB11A68108700A75B9A /* LaunchScreen.xib */,
 				13B07FB71A68108700A75B9A /* main.m */,
+				EA529FF11E5A4260004DF471 /* NativeSigner-Bridging-Header.h */,
 			);
 			name = NativeSigner;
 			sourceTree = "<group>";
@@ -450,6 +468,7 @@
 				832341AE1AAA6A7D00B99B32 /* Libraries */,
 				00E356EF1AD99517003FC87E /* NativeSignerTests */,
 				83CBBA001A601CBA00E9B192 /* Products */,
+				EA529FF61E5A525F004DF471 /* Frameworks */,
 			);
 			indentWidth = 2;
 			sourceTree = "<group>";
@@ -464,6 +483,14 @@
 			name = Products;
 			sourceTree = "<group>";
 		};
+		EA529FF61E5A525F004DF471 /* Frameworks */ = {
+			isa = PBXGroup;
+			children = (
+				EA529FF71E5A525F004DF471 /* libsigner.a */,
+			);
+			name = Frameworks;
+			sourceTree = "<group>";
+		};
 		EA75C33B1E3F45880098CCC9 /* Products */ = {
 			isa = PBXGroup;
 			children = (
@@ -535,6 +562,7 @@
 					};
 					13B07F861A680F5B00A75B9A = {
 						DevelopmentTeam = T4ZYEBHX9P;
+						LastSwiftMigration = 0810;
 					};
 				};
 			};
@@ -853,7 +881,10 @@
 			buildActionMask = 2147483647;
 			files = (
 				13B07FBC1A68108700A75B9A /* AppDelegate.m in Sources */,
+				EA529FF31E5A4261004DF471 /* String.swift in Sources */,
 				13B07FC11A68108700A75B9A /* main.m in Sources */,
+				EA529FD21E5A00B2004DF471 /* EthkeyBridge.m in Sources */,
+				EA529FF51E5A4EF2004DF471 /* EthkeyBridge.swift in Sources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -883,6 +914,7 @@
 		00E356F61AD99517003FC87E /* Debug */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				DEVELOPMENT_TEAM = T4ZYEBHX9P;
 				GCC_PREPROCESSOR_DEFINITIONS = (
@@ -906,6 +938,7 @@
 		00E356F71AD99517003FC87E /* Release */ = {
 			isa = XCBuildConfiguration;
 			buildSettings = {
+				ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES = YES;
 				BUNDLE_LOADER = "$(TEST_HOST)";
 				COPY_PHASE_STRIP = NO;
 				DEVELOPMENT_TEAM = T4ZYEBHX9P;
@@ -927,17 +960,23 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
 				CURRENT_PROJECT_VERSION = 1;
 				DEAD_CODE_STRIPPING = NO;
+				DEFINES_MODULE = YES;
 				DEVELOPMENT_TEAM = T4ZYEBHX9P;
 				INFOPLIST_FILE = NativeSigner/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				LIBRARY_SEARCH_PATHS = ../rust/signer;
 				OTHER_LDFLAGS = (
 					"$(inherited)",
 					"-ObjC",
 					"-lc++",
 				);
 				PRODUCT_NAME = NativeSigner;
+				SWIFT_OBJC_BRIDGING_HEADER = "NativeSigner-Bridging-Header.h";
+				SWIFT_OPTIMIZATION_LEVEL = "-Onone";
+				SWIFT_VERSION = 3.0.1;
 				VERSIONING_SYSTEM = "apple-generic";
 			};
 			name = Debug;
@@ -946,16 +985,21 @@
 			isa = XCBuildConfiguration;
 			buildSettings = {
 				ASSETCATALOG_COMPILER_APPICON_NAME = AppIcon;
+				CLANG_ENABLE_MODULES = YES;
 				CURRENT_PROJECT_VERSION = 1;
+				DEFINES_MODULE = YES;
 				DEVELOPMENT_TEAM = T4ZYEBHX9P;
 				INFOPLIST_FILE = NativeSigner/Info.plist;
 				LD_RUNPATH_SEARCH_PATHS = "$(inherited) @executable_path/Frameworks";
+				LIBRARY_SEARCH_PATHS = ../rust/signer;
 				OTHER_LDFLAGS = (
 					"$(inherited)",
 					"-ObjC",
 					"-lc++",
 				);
 				PRODUCT_NAME = NativeSigner;
+				SWIFT_OBJC_BRIDGING_HEADER = "NativeSigner-Bridging-Header.h";
+				SWIFT_VERSION = 3.0.1;
 				VERSIONING_SYSTEM = "apple-generic";
 			};
 			name = Release;

ios/NativeSigner/AppDelegate.m

@@ -8,7 +8,7 @@
  */
 
 #import "AppDelegate.h"
-
+#import "NativeSigner-Swift.h"
 #import <React/RCTBundleURLProvider.h>
 #import <React/RCTRootView.h>
 
@@ -16,6 +16,10 @@
 
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 {
+	EthkeyBridge* bridge;
+	[bridge brainWallet:@[] callback:^(NSArray *cb) {
+		
+	}];
   NSURL *jsCodeLocation;
 
   jsCodeLocation = [[RCTBundleURLProvider sharedSettings] jsBundleURLForBundleRoot:@"index.ios" fallbackResource:nil];

ios/NativeSigner/EthkeyBridge.m

+//
+//  EthkeyBridge.m
+//  NativeSigner
+//
+//  Created by Marek Kotewicz on 19/02/2017.
+//  Copyright © 2017 Facebook. All rights reserved.
+//
+
+#import <React/RCTBridgeModule.h>
+
+@interface RCT_EXTERN_MODULE(EthkeyBridge, NSObject)
+
+RCT_EXTERN_METHOD(show:(NSString *)name)
+RCT_EXTERN_METHOD(brainWallet:(NSString*)seed callback:(RCTResponseSenderBlock)callback)
+
+@end

ios/NativeSigner/String.swift

+//
+//  String.swift
+//  NativeSigner
+//
+//  Created by Marek Kotewicz on 19/02/2017.
+//  Copyright © 2017 Facebook. All rights reserved.
+//
+
+import Foundation
+
+extension String {
+	static func fromStringPtr(ptr: string_ptr) -> String {
+		let data = NSData(bytes: UnsafeRawPointer(ptr.ptr), length: ptr.len)
+		return String(data: data as Data, encoding: String.Encoding.utf8)!
+	}
+	
+	func asPtr() -> string_ptr {
+		let data = self.data(using: String.Encoding.utf8, allowLossyConversion: false)!
+		return string_ptr(ptr: (data as NSData).bytes.bindMemory(to: UInt8.self, capacity: data.count), len: data.count)
+	}
+}

ios/signer.h

+#pragma once
+
+#include <stdint.h>
+
+// string
+struct string_ptr {
+	const uint8_t* ptr;
+	size_t len;
+};
+
+// removes string pointer
+void ethstore_string_destroy(struct string_ptr* s);
+
+// keypair pointer
+struct keypair_ptr;
+
+// creates new brainwallet keypair from seed
+struct keypair_ptr* ethstore_keypair_brainwallet(const struct string_ptr* seed);
+
+// removes keypair pointer
+void ethstore_keypair_destroy(struct keypair_ptr* keypair);
+
+struct string_ptr* ethstore_keypair_address(const struct keypair_ptr* keypair);
+
+// test
+struct string_ptr* tmp_string();

rust/signer/Cargo.toml

@@ -4,6 +4,8 @@ version = "0.1.0"
 authors = ["debris <marek.kotewicz@gmail.com>"]
 
 [dependencies]
+libc = "0.2"
+ethkey = { git = "https://github.com/ethcore/parity" }
 
 [lib]
 name = "signer"

rust/signer/signer.h

+#pragma once
+
+#include <stdint.h>
+
+// string
+struct string_ptr {
+	const uint8_t* ptr;
+	size_t len;
+};
+
+// removes string pointer
+void ethkey_string_destroy(struct string_ptr* s);
+
+// keypair pointer
+struct keypair_ptr;
+
+// creates new brainwallet keypair from seed
+struct keypair_ptr* ethkey_keypair_brainwallet(const struct string_ptr* seed);
+
+// removes keypair pointer
+void ethkey_keypair_destroy(struct keypair_ptr* keypair);
+
+struct string_ptr* ethkey_keypair_address(const struct keypair_ptr* keypair);
+
+// test
+struct string_ptr* tmp_string();

rust/signer/src/lib.rs

+extern crate libc;
+
+mod string;
+
+use string::StringPtr;
+
+#[no_mangle]
+pub extern fn tmp_string() -> *mut StringPtr {
+  let hello: StringPtr = "hello from rust".into();
+  // let's put it on the heap
+  let boxed_hello = Box::new(hello);
+  // let's make a pointer to the heap, return it and forget about it
+  Box::into_raw(boxed_hello)
+}
+
 #[no_mangle]
 pub extern fn simple() -> i32 {
-	1234
+	12345
 }
 
 #[cfg(test)]

rust/signer/src/string.rs

+use libc::size_t;
+
+// Helper struct that we'll use to give strings to C.
+#[repr(C)]
+pub struct StringPtr {
+    pub ptr: *const u8,
+    pub len: size_t,
+}
+
+impl<'a> From<&'a str> for StringPtr {
+    fn from(s: &'a str) -> Self {
+        StringPtr{
+            ptr: s.as_ptr(),
+            len: s.len() as size_t,
+        }
+    }
+}
+
+impl StringPtr {
+	pub fn as_str(&self) -> &str {
+		use std::slice;
+		use std::str;
+
+		unsafe {
+			let slice = slice::from_raw_parts(self.ptr, self.len);
+			str::from_utf8(slice).unwrap()
+		}
+	}
+}
+

src/components/AccountDetails.js

@@ -20,13 +20,13 @@ export default class AccountDetails extends Component {
         <Text style={styles.text}>Address</Text>
         <Text style={styles.props}>{this.props.account.address}</Text>
         <View style={styles.buttonContainer}>
-          <Button
+          {/*<Button
             style={styles.button}
             onPress={this.props.onSendTransactionPressed}
             title='Send Transaction'
             color='green'
             accessibilityLabel='Press to send new transaction'
-          />
+          />*/}
           <Button
             style={styles.button}
             onPress={() => this.props.onDeleteAccountPressed(this.props.account)}

src/components/App.js

@@ -34,7 +34,7 @@ const scenes = Actions.create(
   <Scene key='root'>
     <Scene key='tabs' tabs style={styles.tabbar}>
       <Scene key='left' title='Scan QR' initial icon={TabIcon} navigationBarStyle={styles.navibar} titleStyle={styles.navibarTitle}>
-        <Scene key='scan' component={QrScanner} title='Scan QR' rightTitle="confirmX"
+        <Scene key='scan' component={QrScanner} title='Scan QR' rightTitle="skip :)"
           onRight={() => Actions.confirm()} rightButtonTextStyle={styles.navibarTitle}/>
         <Scene key='confirm' component={ConfirmTransaction} title='Sign Tx'/>
         <Scene key='select' title='Select Account' component={SelectAccount}/>

src/containers/NewAccount.js

@@ -4,8 +4,8 @@ import { connect } from 'react-redux'
 import { Actions } from 'react-native-router-flux'
 import debounce from 'debounce'
 import NewAccountInput from '../components/NewAccountInput'
-import { words } from '../actions/random'
-import { keypairFromPhrase, toAddress } from '../actions/crypto'
+import { words } from '../util/random'
+import { keypairFromPhrase, toAddress, toAddressAsync } from '../util/crypto'
 import { selectAccount }  from '../actions/accounts'
 
 const mapDispatchToProps = (dispatch) => {
@@ -30,6 +30,7 @@ export class NewAccount extends Component {
     this.state = {
       seed: seed,
       keypair: keypairFromPhrase(seed),
+      address: '',
       name: '',
     }
   }
@@ -53,9 +54,17 @@ export class NewAccount extends Component {
         />
         <Text style={styles.hint}>brain wallet seed</Text>
         <NewAccountInput seed={this.state.seed} onChangeText={
-          debounce((text) => self.setState({keypair: keypairFromPhrase(text)}), 100)
-        }/>
-        <Text style={styles.hint} adjustsFontSizeToFit={true}>0x{toAddress(this.state.keypair)}</Text>
+          debounce((text) => {
+            var keypair = keypairFromPhrase(text)
+            toAddressAsync(keypair, (address) => {
+              self.setState({
+                keypair: keypairFromPhrase(text),
+                address: address,
+              })
+            })
+          }, 100)}
+        />
+        <Text style={styles.hint} adjustsFontSizeToFit={true}>0x{this.state.address}</Text>
         <Button
           onPress={() => this.props.addAccount({
             keypair: this.state.keypair,

src/reducers/accounts.js

@@ -4,9 +4,11 @@ const initialAccounts = {
   all: [{
     address: 'mock',
     name: 'dupa',
+    pin: '',
   }, {
     address: 'mock',
     name: 'Katar',
+    pin: '',
   }],
   selected: {},
 }

src/actions/crypto.js → src/util/crypto.js

 import { ec } from 'elliptic'
 import { keccak_256 } from 'js-sha3'
 var secp = new ec('secp256k1')
+import { EthkeyBridge } from 'NativeModules'
 
 export function keypairFromPhrase(phrase) {
-	var seed = keccak_256.array(phrase);
-	var kp;
-	for (var i = 0; i <= 16384 || !toAddress(kp = secp.keyFromPrivate(seed)).startsWith('00'); ++i)
-		seed = keccak_256.array(seed)
-	return kp
+  var seed = keccak_256.array(phrase);
+  var kp;
+  for (var i = 0; i <= 16384 || !toAddress(kp = secp.keyFromPrivate(seed)).startsWith('00'); ++i)
+    seed = keccak_256.array(seed)
+  return kp
 }
 
 export function toAddress(kp) { return keccak_256(kp.getPublic('buffer').slice(1)).substr(24); }
 
+export function toAddressAsync(kp, callback) {
+  //EthkeyBridge.show("hello")
+  EthkeyBridge.brainWallet("" + 1, callback)
+  //return
+}

src/actions/random.js → src/util/random.js

@@ -6,7 +6,3 @@ export function words() {
   return Array.from(buf).map(n => dictionary[n]).join(' ')
 }
 
-// this should be later replaced with random keypair
-export function address() {
-  return '0xb794f5ea0ba39494ce839613fffba74279579268'
-}