Add backend for client sample of react-native, added logger, connection to switch and sender receiver function along with aesutils, added react-native interface for sender device (#188)

Co-authored-by: Sumedhe Dissanayake <[email protected]>

Author: carpecodeum

senz-client-samples/react-native/backend/.gitignore

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+# OSX
+#
+.DS_Store
+
+# Xcode
+#
+build/
+*.pbxuser
+!default.pbxuser
+*.mode1v3
+!default.mode1v3
+*.mode2v3
+!default.mode2v3
+*.perspectivev3
+!default.perspectivev3
+xcuserdata
+*.xccheckout
+*.moved-aside
+DerivedData
+*.hmap
+*.ipa
+*.xcuserstate
+
+# node.js
+#
+node_modules/
+npm-debug.log
+yarn-error.log
+
+# BUCK
+buck-out/
+\.buckd/
+*.keystore
+!debug.keystore
+
+# fastlane
+#
+# It is recommended to not store the screenshots in the git repo. Instead, use fastlane to re-generate the
+# screenshots whenever they are needed.
+# For more information about the recommended setup visit:
+# https://docs.fastlane.tools/best-practices/source-control/
+
+*/fastlane/report.xml
+*/fastlane/Preview.html
+*/fastlane/screenshots
+
+# Bundle artifact
+*.jsbundle

senz-client-samples/react-native/backend/AESutils.js

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+const aesjs = require("aes-js");
+const base64js = require("base64-js");
+const ab2str = require("arraybuffer-to-string");
+
+class AESUtils {
+  constructor(key) {
+    this.bs = 32;
+    this.key = key;
+  }
+  encrypt(raw) {
+    //Message should be a multiple of 16 bytes
+    raw = this.pad(raw);
+    // The initialization vector (must be 16 bytes)
+    const iv = [21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36];
+    //Convert text to bytes
+    const textBytes = aesjs.utils.utf8.toBytes(raw);
+    const aesCbc = new aesjs.ModeOfOperation.cbc(this.key, iv);
+    //Encrypt the message
+    const encryptedBytes = aesCbc.encrypt(textBytes);
+    const encryptedBytesBase64 = base64js.fromByteArray(encryptedBytes);
+    return encryptedBytesBase64;
+  }
+  decrypt(enc) {
+    const iv = [21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36];
+    const encryptedBytes = base64js.toByteArray(enc);
+    const aesCbc = new aesjs.ModeOfOperation.cbc(this.key, iv);
+    //Get the decrypted bytes
+    const decryptedBytes = aesCbc.decrypt(encryptedBytes);
+    //Convert the decrypted bytes to text
+    const uint8 = new Uint8Array(decryptedBytes);
+    const decryptedText = ab2str(uint8);
+    return this.unpad(decryptedText);
+  }
+  ord(str) {
+    return str.charCodeAt(0);
+  }
+
+  pad(s) {
+    let fins = "";
+    const num = this.bs - (s.length % this.bs);
+    for (let i = 0; i < num; i++) {
+      fins = fins + String.fromCharCode(this.bs - (s.length % this.bs));
+    }
+    return s + fins;
+  }
+  unpad(s) {
+    return s.substr(0, s.length - this.ord(s.substr(s.length - 1)));
+  }
+}
+
+module.exports = AESUtils;