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buffer-equal-constant-time

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    buffer-equal-constant-time

Constant-time comparison of Buffers


Version published
Weekly downloads
15M
decreased by-2.03%
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1
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6.18 kB
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Package description

What is buffer-equal-constant-time?

The buffer-equal-constant-time npm package is used to check if two buffers are equal without leaking timing information that could be used to infer the contents of the buffers. This is particularly useful for preventing timing attacks when comparing sensitive data, such as cryptographic hashes or tokens.

What are buffer-equal-constant-time's main functionalities?

Constant-time buffer comparison

This feature allows for the comparison of two buffers in a way that the time taken to compare them does not depend on the number of bytes that match. This is important for security purposes to prevent timing attacks.

const bufferEqualConstantTime = require('buffer-equal-constant-time');
const buffer1 = Buffer.from('sensitive data');
const buffer2 = Buffer.from('sensitive data');
const isEqual = bufferEqualConstantTime(buffer1, buffer2); // returns true if equal, false otherwise

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Source

buffer-equal-constant-time

Constant-time Buffer comparison for node.js. Should work with browserify too.

Build Status

  npm install buffer-equal-constant-time

Usage

  var bufferEq = require('buffer-equal-constant-time');

  var a = new Buffer('asdf');
  var b = new Buffer('asdf');
  if (bufferEq(a,b)) {
    // the same!
  } else {
    // different in at least one byte!
  }

If you'd like to install an .equal() method onto the node.js Buffer and SlowBuffer prototypes:

  require('buffer-equal-constant-time').install();

  var a = new Buffer('asdf');
  var b = new Buffer('asdf');
  if (a.equal(b)) {
    // the same!
  } else {
    // different in at least one byte!
  }

To get rid of the installed .equal() method, call .restore():

  require('buffer-equal-constant-time').restore();

© 2013 GoInstant Inc., a salesforce.com company

Licensed under the BSD 3-clause license.

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Last updated on 16 Dec 2013

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