Edit D:\xinhaisoft\crisis_new\api\node_modules\tsscmp\lib\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 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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