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.*.sw[mnop]
node_modules/

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# buffer-equal-constant-time
Constant-time `Buffer` comparison for node.js. Should work with browserify too.
[![Build Status](https://travis-ci.org/goinstant/buffer-equal-constant-time.png?branch=master)](https://travis-ci.org/goinstant/buffer-equal-constant-time)
```sh
npm install buffer-equal-constant-time
```
# Usage
```js
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:
```js
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()`:
```js
require('buffer-equal-constant-time').restore();
```
# Legal
© 2013 GoInstant Inc., a salesforce.com company
Licensed under the BSD 3-clause license.

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/*jshint node:true */
'use strict';
var Buffer = require('buffer').Buffer; // browserify
var SlowBuffer = require('buffer').SlowBuffer;
module.exports = bufferEq;
function bufferEq(a, b) {
// shortcutting on type is necessary for correctness
if (!Buffer.isBuffer(a) || !Buffer.isBuffer(b)) {
return false;
}
// buffer sizes should be well-known information, so despite this
// shortcutting, it doesn't leak any information about the *contents* of the
// buffers.
if (a.length !== b.length) {
return false;
}
var c = 0;
for (var i = 0; i < a.length; i++) {
/*jshint bitwise:false */
c |= a[i] ^ b[i]; // XOR
}
return c === 0;
}
bufferEq.install = function() {
Buffer.prototype.equal = SlowBuffer.prototype.equal = function equal(that) {
return bufferEq(this, that);
};
};
var origBufEqual = Buffer.prototype.equal;
var origSlowBufEqual = SlowBuffer.prototype.equal;
bufferEq.restore = function() {
Buffer.prototype.equal = origBufEqual;
SlowBuffer.prototype.equal = origSlowBufEqual;
};

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{
"name": "buffer-equal-constant-time",
"version": "1.0.1",
"description": "Constant-time comparison of Buffers",
"main": "index.js",
"scripts": {
"test": "mocha test.js"
},
"repository": "git@github.com:goinstant/buffer-equal-constant-time.git",
"keywords": [
"buffer",
"equal",
"constant-time",
"crypto"
],
"author": "GoInstant Inc., a salesforce.com company",
"license": "BSD-3-Clause",
"devDependencies": {
"mocha": "~1.15.1"
}
}