2fa 中文文档教程

发布于 6年前 浏览 28 项目主页 更新于 3年前

2FA

用于生成和验证 2FA 代码(特别是 TOTP 和 HOTP)的模块。

还包含用于处理 2FA 逻辑的实用程序,例如生成与 Google Authenticator 兼容的 QR 代码(无需通过 Google Charts)和生成备份代码。

Install

npm install --save 2fa

Usage

var tfa = require('2fa');

// lets generate a new key for a user
// tfa.generateKey(length (optional), cb)
tfa.generateKey(32, function(err, key) {
  // crypto secure hex key with 32 characters

  // generate crypto-secure backups codes in a user-friendly pattern
  // tfa.generateBackupCodes(num, pattern (optional), cb)
  tfa.generateBackupCodes(8, 'xxxx-xxxx-xxxx', function(err, codes) {
    // [ '7818-b7b8-c928', '3526-dc04-d3f2', 'be3c-5d9f-cb68', ... ]

    // these should be sent to the user, stored and checked when we get a 2fa code
  });

  // generate a google QR code so the user can save their new key
  // tfa.generateGoogleQR(name, accountname, secretkey, cb)
  tfa.generateGoogleQR('Company', 'email@gmail.com', key, function(err, qr) {
    // data URL png image for google authenticator
  });

  var opts = {
    // the number of counters to check before what we're given
    // default: 0
    beforeDrift: 2,
    // and the number to check after
    // default: 0
    afterDrift: 2,
    // if before and after drift aren't specified,
    // before + after drift are set to drift / 2
    // default: 0
    drift: 4,
    // the step for the TOTP counter in seconds
    // default: 30
    step: 30
  };

  // calculate the counter for the HOTP (pretending it's actually TOTP)
  var counter = Math.floor(Date.now() / 1000 / opts.step);

  // generate a valid code (in real-life this will be user-input)
  var code = tfa.generateCode(key, counter);

  // verify it as a HOTP
  var validHOTP = tfa.verifyHOTP(key, code, counter, opts);
  // true

  // for TOTP, the counter is calculated internally using Date.now();
  var validTOTP = tfa.verifyTOTP(key, code, opts);
  // true

});

2FA

Module for generating and verifying 2FA codes (specifically TOTP and HOTP).

Also contains utilities for handing 2FA logic, such as generating Google Authenticator compatible QR codes (without going via Google Charts) and generating backup codes.

Install

npm install --save 2fa

Usage

var tfa = require('2fa');

// lets generate a new key for a user
// tfa.generateKey(length (optional), cb)
tfa.generateKey(32, function(err, key) {
  // crypto secure hex key with 32 characters

  // generate crypto-secure backups codes in a user-friendly pattern
  // tfa.generateBackupCodes(num, pattern (optional), cb)
  tfa.generateBackupCodes(8, 'xxxx-xxxx-xxxx', function(err, codes) {
    // [ '7818-b7b8-c928', '3526-dc04-d3f2', 'be3c-5d9f-cb68', ... ]

    // these should be sent to the user, stored and checked when we get a 2fa code
  });

  // generate a google QR code so the user can save their new key
  // tfa.generateGoogleQR(name, accountname, secretkey, cb)
  tfa.generateGoogleQR('Company', 'email@gmail.com', key, function(err, qr) {
    // data URL png image for google authenticator
  });

  var opts = {
    // the number of counters to check before what we're given
    // default: 0
    beforeDrift: 2,
    // and the number to check after
    // default: 0
    afterDrift: 2,
    // if before and after drift aren't specified,
    // before + after drift are set to drift / 2
    // default: 0
    drift: 4,
    // the step for the TOTP counter in seconds
    // default: 30
    step: 30
  };

  // calculate the counter for the HOTP (pretending it's actually TOTP)
  var counter = Math.floor(Date.now() / 1000 / opts.step);

  // generate a valid code (in real-life this will be user-input)
  var code = tfa.generateCode(key, counter);

  // verify it as a HOTP
  var validHOTP = tfa.verifyHOTP(key, code, counter, opts);
  // true

  // for TOTP, the counter is calculated internally using Date.now();
  var validTOTP = tfa.verifyTOTP(key, code, opts);
  // true

});
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