feat: ported totp.js library to zepp quick-js

lib/totp.js/.travis.yml

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+language: node_js
+node_js:
+  - "8"

lib/totp.js/README.md

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+# totp.js
+Two-factor authentication implementation in pure javascript. One-time password generator (HOTP/TOTP) with support for Google Authenticator.
+
+[![Build Status](https://travis-ci.org/wuyanxin/totp.js.svg?branch=master)](https://travis-ci.org/wuyanxin/totp.js)
+

lib/totp.js/index.js

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+/*
+ * @Author: wuyanxin
+ * @Date: 2018-03-21 23:12:14
+ * @Last Modified by:   wuyanxin
+ * @Last Modified time: 2018-03-21 23:12:14
+ */
+
+export {HOTP} from './lib/hotp.js'
+export {TOTP} from './lib/totp.js'

lib/totp.js/lib/hotp.js

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+/*
+ * @Author: wuyanxin
+ * @Date: 2018-03-21 22:25:37
+ * @Last Modified by: wuyanxin
+ * @Last Modified time: 2018-03-21 22:29:43
+ */
+
+import {encode, decode} from '../../thirty-two/index.js'
+import jsSHA from 'jssha'
+
+export class HOTP {
+
+  /**
+   *
+   * @param {string} key secret key
+   * @param {*} digit lenth of otp code
+   */
+  constructor(key, digit = 6) {
+    this.key = key;
+    this.digit = digit;
+  }
+
+  /**
+   * generate secret key
+   * @param {int} len
+   */
+  static randomKey(len = 16) {
+    const str = Math.random().toString(36);
+    return encode(str).toString().substr(0, len);
+  }
+
+  /**
+   * generate a OTP base on HMAC-SHA-1
+   * @param {int} movingFactor counter
+   */
+  genOTP(movingFactor) {
+    const hmacSha = new jsSHA('SHA-1', 'BYTES');
+    hmacSha.setHMACKey(decode(this.key).toString(), 'BYTES');
+
+    const factorByte = this._factor2ByteText(movingFactor);
+    hmacSha.update(factorByte);
+
+    const hmac_result = hmacSha.getHMAC('BYTES');
+    return this._truncat(hmac_result);
+  }
+
+  /**
+   * verify a OPT code
+   * @param {string} opt opt code
+   * @param {int} movingFactor counter
+   */
+  verify(opt, movingFactor) {
+    return opt === this.genOTP(movingFactor);
+  }
+
+  _truncat(hmac_result) {
+    const offset   =  hmac_result[19].charCodeAt() & 0xf;
+    const bin_code = (hmac_result[offset].charCodeAt()  & 0x7f) << 24
+       | (hmac_result[offset+1].charCodeAt() & 0xff) << 16
+       | (hmac_result[offset+2].charCodeAt() & 0xff) <<  8
+       | (hmac_result[offset+3].charCodeAt() & 0xff);
+    let otp = (bin_code % 10 ** this.digit).toString();
+    while (otp.length < this.digit) {
+      otp = '0' + otp;
+    }
+    return otp;
+  }
+
+  _factor2ByteText(movingFactor) {
+    const text = new Array(8);
+    for (let i = text.length - 1; i >= 0; i--) {
+      text[i] = String.fromCharCode(movingFactor & 0xFF);
+      movingFactor >>= 8;
+    }
+    return text.join('');
+  }
+}

lib/totp.js/lib/totp.js

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+/*
+ * @Author: wuyanxin
+ * @Date: 2018-03-21 22:25:42
+ * @Last Modified by: wuyanxin
+ * @Last Modified time: 2018-03-21 22:42:28
+ */
+
+import {HOTP} from "./hotp.js";
+
+export class TOTP extends HOTP {
+  constructor(key){
+    super(key)
+  }
+
+  genOTP(timeStep = 30, t0 = 0) {
+    const T = Math.floor((Date.now() / 1000 - t0) / timeStep);
+    return super.genOTP(T);
+  }
+
+  verify(otp, timeStep = 30, t0 = 0) {
+    return otp === this.genOTP(timeStep, t0);
+  }
+
+}

lib/totp.js/package.json

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+{
+  "name": "totp.js",
+  "version": "0.0.1",
+  "description": "Two-factor authentication implementation in pure javascript. One-time password generator (HOTP/TOTP) with support for Google Authenticator. ",
+  "main": "index.js",
+  "scripts": {
+    "test": "./node_modules/.bin/mocha"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/wuyanxin/totp.js.git"
+  },
+  "keywords": [
+    "otp",
+    "hotp",
+    "totp",
+    "Two-factor authentication",
+    "Google authenticator"
+  ],
+  "author": "wuyanxin",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/wuyanxin/totp.js/issues"
+  },
+  "homepage": "https://github.com/wuyanxin/totp.js#readme",
+  "dependencies": {
+    "jssha": "^2.3.1",
+    "thirty-two": "^1.0.2"
+  },
+  "devDependencies": {
+    "mocha": "^5.0.4"
+  }
+}