# bcrypt.js Optimized bcrypt in JavaScript with zero dependencies, with TypeScript support. Compatible to the C++ [bcrypt](https://npmjs.org/package/bcrypt) binding on Node.js and also working in the browser. [![Build Status](https://img.shields.io/github/actions/workflow/status/dcodeIO/bcrypt.js/test.yml?branch=main&label=test&logo=github)](https://github.com/dcodeIO/bcrypt.js/actions/workflows/test.yml) [![Publish Status](https://img.shields.io/github/actions/workflow/status/dcodeIO/bcrypt.js/publish.yml?branch=main&label=publish&logo=github)](https://github.com/dcodeIO/bcrypt.js/actions/workflows/publish.yml) [![npm](https://img.shields.io/npm/v/bcryptjs.svg?label=npm&color=007acc&logo=npm)](https://www.npmjs.com/package/bcryptjs) ## 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 UTF-8 encoded characters use up to 4 bytes) and the length of generated hashes is 60 characters. Note that maximum input length is not implicitly checked by the library for compatibility with the C++ binding on Node.js, but should be checked with `bcrypt.truncates(password)` where necessary. ## Usage The package exports an ECMAScript module with an UMD fallback. ``` $> npm install bcryptjs ``` ```ts import bcrypt from "bcryptjs"; ``` ### Usage with a CDN - From GitHub via [jsDelivr](https://www.jsdelivr.com):
`https://cdn.jsdelivr.net/gh/dcodeIO/bcrypt.js@TAG/index.js` (ESM) - From npm via [jsDelivr](https://www.jsdelivr.com):
`https://cdn.jsdelivr.net/npm/bcryptjs@VERSION/index.js` (ESM)
`https://cdn.jsdelivr.net/npm/bcryptjs@VERSION/umd/index.js` (UMD) - From npm via [unpkg](https://unpkg.com):
`https://unpkg.com/bcryptjs@VERSION/index.js` (ESM)
`https://unpkg.com/bcryptjs@VERSION/umd/index.js` (UMD) Replace `TAG` respectively `VERSION` with a [specific version](https://github.com/dcodeIO/bcrypt.js/releases) or omit it (not recommended in production) to use latest. When using the ESM variant in a browser, the `crypto` import needs to be stubbed out, for example using an [import map](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/script/type/importmap). Bundlers should omit it automatically. ### Usage - Sync To hash a password: ```ts const salt = bcrypt.genSaltSync(10); const hash = bcrypt.hashSync("B4c0/\/", salt); // Store hash in your password DB ``` To check a password: ```ts // Load hash from your password DB bcrypt.compareSync("B4c0/\/", hash); // true bcrypt.compareSync("not_bacon", hash); // false ``` Auto-gen a salt and hash: ```ts const hash = bcrypt.hashSync("bacon", 10); ``` ### Usage - Async To hash a password: ```ts const salt = await bcrypt.genSalt(10); const hash = await bcrypt.hash("B4c0/\/", salt); // Store hash in your password DB ``` ```ts bcrypt.genSalt(10, (err, salt) => { bcrypt.hash("B4c0/\/", salt, function (err, hash) { // Store hash in your password DB }); }); ``` To check a password: ```ts // Load hash from your password DB await bcrypt.compare("B4c0/\/", hash); // true await bcrypt.compare("not_bacon", hash); // false ``` ```ts // Load hash from your password DB bcrypt.compare("B4c0/\/", hash, (err, res) => { // res === true }); bcrypt.compare("not_bacon", hash, (err, res) => { // res === false }); ``` Auto-gen a salt and hash: ```ts await bcrypt.hash("B4c0/\/", 10); // Store hash in your password DB ``` ```ts bcrypt.hash("B4c0/\/", 10, (err, hash) => { // Store hash in your password DB }); ``` **Note:** Under the hood, asynchronous APIs split an operation into small chunks. After the completion of a chunk, the execution of the next chunk is placed on the back of the [JS event queue](https://developer.mozilla.org/en/docs/Web/JavaScript/EventLoop), efficiently yielding for other computation to execute. ### Usage - Command Line ``` Usage: bcrypt [rounds|salt] ``` ## API ### Callback types - **Callback<`T`>**: `(err: Error | null, result?: T) => void`
Called with an error on failure or a value of type `T` upon success. - **ProgressCallback**: `(percentage: number) => void`
Called with the percentage of rounds completed (0.0 - 1.0), maximally once per `MAX_EXECUTION_TIME = 100` ms. - **RandomFallback**: `(length: number) => number[]`
Called to obtain random bytes when both [Web Crypto API](http://www.w3.org/TR/WebCryptoAPI/) and Node.js [crypto](http://nodejs.org/api/crypto.html) are not available. ### Functions - bcrypt.**genSaltSync**(rounds?: `number`): `string`
Synchronously generates a salt. Number of rounds defaults to 10 when omitted. - bcrypt.**genSalt**(rounds?: `number`): `Promise`
Asynchronously generates a salt. Number of rounds defaults to 10 when omitted. - bcrypt.**genSalt**([rounds: `number`, ]callback: `Callback`): `void`
Asynchronously generates a salt. Number of rounds defaults to 10 when omitted. - bcrypt.**truncates**(password: `string`): `boolean`
Tests if a password will be truncated when hashed, that is its length is greater than 72 bytes when converted to UTF-8. - bcrypt.**hashSync**(password: `string`, salt?: `number | string`): `string` Synchronously generates a hash for the given password. Number of rounds defaults to 10 when omitted. - bcrypt.**hash**(password: `string`, salt: `number | string`): `Promise`
Asynchronously generates a hash for the given password. - bcrypt.**hash**(password: `string`, salt: `number | string`, callback: `Callback`, progressCallback?: `ProgressCallback`): `void`
Asynchronously generates a hash for the given password. - bcrypt.**compareSync**(password: `string`, hash: `string`): `boolean`
Synchronously tests a password against a hash. - bcrypt.**compare**(password: `string`, hash: `string`): `Promise`
Asynchronously compares a password against a hash. - bcrypt.**compare**(password: `string`, hash: `string`, callback: `Callback`, progressCallback?: `ProgressCallback`)
Asynchronously compares a password against a hash. - bcrypt.**getRounds**(hash: `string`): `number`
Gets the number of rounds used to encrypt the specified hash. - bcrypt.**getSalt**(hash: `string`): `string`
Gets the salt portion from a hash. Does not validate the hash. - bcrypt.**setRandomFallback**(random: `RandomFallback`): `void`
Sets the pseudo random number generator to use as a fallback if neither [Web Crypto API](http://www.w3.org/TR/WebCryptoAPI/) nor Node.js [crypto](http://nodejs.org/api/crypto.html) are available. Please note: It is highly important that the PRNG used is cryptographically secure and that it is seeded properly! ## Building Building the UMD fallback: ``` $> npm run build ``` Running the [tests](./tests): ``` $> npm test ``` ## Credits Based on work started by Shane Girish at [bcrypt-nodejs](https://github.com/shaneGirish/bcrypt-nodejs), which is itself based on [javascript-bcrypt](http://code.google.com/p/javascript-bcrypt/) (New BSD-licensed).

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