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Viewing: index.js

'use strict';

// Implements Brad Hill's Double HMAC pattern from
// https://www.nccgroup.trust/us/about-us/newsroom-and-events/blog/2011/february/double-hmac-verification/.
// The approach is similar to the node's native implementation of timing safe buffer comparison that will be available on v6+.
// https://github.com/nodejs/node/issues/3043
// https://github.com/nodejs/node/pull/3073

var crypto = require('crypto');

function bufferEqual(a, b) {
  if (a.length !== b.length) {
    return false;
  }
  // `crypto.timingSafeEqual` was introduced in Node v6.6.0
  // <https://github.com/jshttp/basic-auth/issues/39>
  if (crypto.timingSafeEqual) {
    return crypto.timingSafeEqual(a, b);
  }
  for (var i = 0; i < a.length; i++) {
    if (a[i] !== b[i]) {
      return false;
    }
  }
  return true;
}

function timeSafeCompare(a, b) {
  var sa = String(a);
  var sb = String(b);
  var key = crypto.pseudoRandomBytes(32);
  var ah = crypto.createHmac('sha256', key).update(sa).digest();
  var bh = crypto.createHmac('sha256', key).update(sb).digest();

  return bufferEqual(ah, bh) && a === b;
}

module.exports = timeSafeCompare;

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