252 lines
9.7 KiB
Markdown
252 lines
9.7 KiB
Markdown
bcrypt.js
|
|
=========
|
|
Optimized bcrypt in JavaScript with zero dependencies. Compatible to the C++ [bcrypt](https://npmjs.org/package/bcrypt)
|
|
binding on node.js and also working in the browser.
|
|
|
|
<a href="https://travis-ci.org/dcodeIO/bcrypt.js"><img alt="build static" src="https://travis-ci.org/dcodeIO/bcrypt.js.svg?branch=master" /></a> <a href="https://npmjs.org/package/bcryptjs"><img src="https://img.shields.io/npm/v/bcryptjs.svg" alt=""></a> <a href="https://npmjs.org/package/bcryptjs"><img src="https://img.shields.io/npm/dm/bcryptjs.svg" alt=""></a> <a href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=dcode%40dcode.io&item_name=Open%20Source%20Software%20Donation&item_number=dcodeIO%2Fbcrypt.js"><img alt="donate ❤" src="https://img.shields.io/badge/donate-❤-ff2244.svg"></a>
|
|
|
|
|
|
Security considerations
|
|
-----------------------
|
|
Besides incorporating a salt to protect against rainbow table attacks, bcrypt is an adaptive function: over time, the
|
|
iteration count can be increased to make it slower, so it remains resistant to brute-force search attacks even with
|
|
increasing computation power. ([see](http://en.wikipedia.org/wiki/Bcrypt))
|
|
|
|
While bcrypt.js is compatible to the C++ bcrypt binding, it is written in pure JavaScript and thus slower ([about 30%](https://github.com/dcodeIO/bcrypt.js/wiki/Benchmark)), effectively reducing the number of iterations that can be
|
|
processed in an equal time span.
|
|
|
|
The maximum input length is 72 bytes (note that UTF8 encoded characters use up to 4 bytes) and the length of generated
|
|
hashes is 60 characters.
|
|
|
|
Usage
|
|
-----
|
|
The library is compatible with CommonJS and AMD loaders and is exposed globally as `dcodeIO.bcrypt` if neither is
|
|
available.
|
|
|
|
### node.js
|
|
|
|
On node.js, the inbuilt [crypto module](http://nodejs.org/api/crypto.html)'s randomBytes interface is used to obtain
|
|
secure random numbers.
|
|
|
|
`npm install bcryptjs`
|
|
|
|
```js
|
|
var bcrypt = require('bcryptjs');
|
|
...
|
|
```
|
|
|
|
### Browser
|
|
|
|
In the browser, bcrypt.js relies on [Web Crypto API](http://www.w3.org/TR/WebCryptoAPI)'s getRandomValues
|
|
interface to obtain secure random numbers. If no cryptographically secure source of randomness is available, you may
|
|
specify one through [bcrypt.setRandomFallback](https://github.com/dcodeIO/bcrypt.js#setrandomfallbackrandom).
|
|
|
|
```js
|
|
var bcrypt = dcodeIO.bcrypt;
|
|
...
|
|
```
|
|
|
|
or
|
|
|
|
```js
|
|
require.config({
|
|
paths: { "bcrypt": "/path/to/bcrypt.js" }
|
|
});
|
|
require(["bcrypt"], function(bcrypt) {
|
|
...
|
|
});
|
|
```
|
|
|
|
Usage - Sync
|
|
------------
|
|
To hash a password:
|
|
|
|
```javascript
|
|
var bcrypt = require('bcryptjs');
|
|
var salt = bcrypt.genSaltSync(10);
|
|
var hash = bcrypt.hashSync("B4c0/\/", salt);
|
|
// Store hash in your password DB.
|
|
```
|
|
|
|
To check a password:
|
|
|
|
```javascript
|
|
// Load hash from your password DB.
|
|
bcrypt.compareSync("B4c0/\/", hash); // true
|
|
bcrypt.compareSync("not_bacon", hash); // false
|
|
```
|
|
|
|
Auto-gen a salt and hash:
|
|
|
|
```javascript
|
|
var hash = bcrypt.hashSync('bacon', 8);
|
|
```
|
|
|
|
Usage - Async
|
|
-------------
|
|
To hash a password:
|
|
|
|
```javascript
|
|
var bcrypt = require('bcryptjs');
|
|
bcrypt.genSalt(10, function(err, salt) {
|
|
bcrypt.hash("B4c0/\/", salt, function(err, hash) {
|
|
// Store hash in your password DB.
|
|
});
|
|
});
|
|
```
|
|
|
|
To check a password:
|
|
|
|
```javascript
|
|
// Load hash from your password DB.
|
|
bcrypt.compare("B4c0/\/", hash, function(err, res) {
|
|
// res === true
|
|
});
|
|
bcrypt.compare("not_bacon", hash, function(err, res) {
|
|
// res === false
|
|
});
|
|
|
|
// As of bcryptjs 2.4.0, compare returns a promise if callback is omitted:
|
|
bcrypt.compare("B4c0/\/", hash).then((res) => {
|
|
// res === true
|
|
});
|
|
```
|
|
|
|
Auto-gen a salt and hash:
|
|
|
|
```javascript
|
|
bcrypt.hash('bacon', 8, function(err, hash) {
|
|
});
|
|
```
|
|
|
|
**Note:** Under the hood, asynchronisation splits a crypto operation into small chunks. After the completion of a chunk, the execution of the next chunk is placed on the back of [JS event loop queue](https://developer.mozilla.org/en/docs/Web/JavaScript/EventLoop), thus efficiently sharing the computational resources with the other operations in the queue.
|
|
|
|
API
|
|
---
|
|
### setRandomFallback(random)
|
|
|
|
Sets the pseudo random number generator to use as a fallback if neither node's `crypto` module nor the Web Crypto
|
|
API is available. Please note: It is highly important that the PRNG used is cryptographically secure and that it is
|
|
seeded properly!
|
|
|
|
| Parameter | Type | Description
|
|
|-----------------|-----------------|---------------
|
|
| random | *function(number):!Array.<number>* | Function taking the number of bytes to generate as its sole argument, returning the corresponding array of cryptographically secure random byte values.
|
|
| **@see** | | http://nodejs.org/api/crypto.html
|
|
| **@see** | | http://www.w3.org/TR/WebCryptoAPI/
|
|
|
|
**Hint:** You might use [isaac.js](https://github.com/rubycon/isaac.js) as a CSPRNG but you still have to make sure to
|
|
seed it properly.
|
|
|
|
### genSaltSync(rounds=, seed_length=)
|
|
|
|
Synchronously generates a salt.
|
|
|
|
| Parameter | Type | Description
|
|
|-----------------|-----------------|---------------
|
|
| rounds | *number* | Number of rounds to use, defaults to 10 if omitted
|
|
| seed_length | *number* | Not supported.
|
|
| **@returns** | *string* | Resulting salt
|
|
| **@throws** | *Error* | If a random fallback is required but not set
|
|
|
|
### genSalt(rounds=, seed_length=, callback)
|
|
|
|
Asynchronously generates a salt.
|
|
|
|
| Parameter | Type | Description
|
|
|-----------------|-----------------|---------------
|
|
| rounds | *number | function(Error, string=)* | Number of rounds to use, defaults to 10 if omitted
|
|
| seed_length | *number | function(Error, string=)* | Not supported.
|
|
| callback | *function(Error, string=)* | Callback receiving the error, if any, and the resulting salt
|
|
| **@returns** | *Promise* | If `callback` has been omitted
|
|
| **@throws** | *Error* | If `callback` is present but not a function
|
|
|
|
### hashSync(s, salt=)
|
|
|
|
Synchronously generates a hash for the given string.
|
|
|
|
| Parameter | Type | Description
|
|
|-----------------|-----------------|---------------
|
|
| s | *string* | String to hash
|
|
| salt | *number | string* | Salt length to generate or salt to use, default to 10
|
|
| **@returns** | *string* | Resulting hash
|
|
|
|
### hash(s, salt, callback, progressCallback=)
|
|
|
|
Asynchronously generates a hash for the given string.
|
|
|
|
| Parameter | Type | Description
|
|
|-----------------|-----------------|---------------
|
|
| s | *string* | String to hash
|
|
| salt | *number | string* | Salt length to generate or salt to use
|
|
| callback | *function(Error, string=)* | Callback receiving the error, if any, and the resulting hash
|
|
| progressCallback | *function(number)* | Callback successively called with the percentage of rounds completed (0.0 - 1.0), maximally once per `MAX_EXECUTION_TIME = 100` ms.
|
|
| **@returns** | *Promise* | If `callback` has been omitted
|
|
| **@throws** | *Error* | If `callback` is present but not a function
|
|
|
|
### compareSync(s, hash)
|
|
|
|
Synchronously tests a string against a hash.
|
|
|
|
| Parameter | Type | Description
|
|
|-----------------|-----------------|---------------
|
|
| s | *string* | String to compare
|
|
| hash | *string* | Hash to test against
|
|
| **@returns** | *boolean* | true if matching, otherwise false
|
|
| **@throws** | *Error* | If an argument is illegal
|
|
|
|
### compare(s, hash, callback, progressCallback=)
|
|
|
|
Asynchronously compares the given data against the given hash.
|
|
|
|
| Parameter | Type | Description
|
|
|-----------------|-----------------|---------------
|
|
| s | *string* | Data to compare
|
|
| hash | *string* | Data to be compared to
|
|
| callback | *function(Error, boolean)* | Callback receiving the error, if any, otherwise the result
|
|
| progressCallback | *function(number)* | Callback successively called with the percentage of rounds completed (0.0 - 1.0), maximally once per `MAX_EXECUTION_TIME = 100` ms.
|
|
| **@returns** | *Promise* | If `callback` has been omitted
|
|
| **@throws** | *Error* | If `callback` is present but not a function
|
|
|
|
### getRounds(hash)
|
|
|
|
Gets the number of rounds used to encrypt the specified hash.
|
|
|
|
| Parameter | Type | Description
|
|
|-----------------|-----------------|---------------
|
|
| hash | *string* | Hash to extract the used number of rounds from
|
|
| **@returns** | *number* | Number of rounds used
|
|
| **@throws** | *Error* | If `hash` is not a string
|
|
|
|
### getSalt(hash)
|
|
|
|
Gets the salt portion from a hash. Does not validate the hash.
|
|
|
|
| Parameter | Type | Description
|
|
|-----------------|-----------------|---------------
|
|
| hash | *string* | Hash to extract the salt from
|
|
| **@returns** | *string* | Extracted salt part
|
|
| **@throws** | *Error* | If `hash` is not a string or otherwise invalid
|
|
|
|
|
|
Command line
|
|
------------
|
|
`Usage: bcrypt <input> [salt]`
|
|
|
|
If the input has spaces inside, simply surround it with quotes.
|
|
|
|
Downloads
|
|
---------
|
|
* [Distributions](https://github.com/dcodeIO/bcrypt.js/tree/master/dist)
|
|
* [ZIP-Archive](https://github.com/dcodeIO/bcrypt.js/archive/master.zip)
|
|
* [Tarball](https://github.com/dcodeIO/bcrypt.js/tarball/master)
|
|
|
|
Credits
|
|
-------
|
|
Based on work started by Shane Girish at [bcrypt-nodejs](https://github.com/shaneGirish/bcrypt-nodejs) (MIT-licensed),
|
|
which is itself based on [javascript-bcrypt](http://code.google.com/p/javascript-bcrypt/) (New BSD-licensed).
|
|
|
|
License
|
|
-------
|
|
New-BSD / MIT ([see](https://github.com/dcodeIO/bcrypt.js/blob/master/LICENSE))
|