# bcrypt-ts
[](https://www.npmjs.com/package/bcrypt-ts)
[](https://www.npmjs.com/package/bcrypt-ts)
[](https://mister-hope.github.io/bcrypt-ts/)
[](https://github.com/Mister-Hope/bcrypt-ts/actions/workflows/test.yml)
[](https://deepscan.io/dashboard#view=project&tid=15982&pid=28024&bid=898932) [](https://codecov.io/gh/Mister-Hope/bcrypt-ts)
Optimized bcrypt in TypeScript with zero dependencies. Compatible to the C++ [bcrypt](https://npmjs.org/package/bcrypt) binding on Node.js and also working in the browser.
## Why bcrypt-ts instead of bcrypt.js
- Fully written in TypeScript
- Provides separate ESM modules for Node.js and browser environments
- Minified output
- Better tree-shaking
## 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-ts is compatible with the C++ bcrypt binding, it is built 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 `truncates(password)` where necessary.
## Install
### Node.js
Install the package:
```bash
npm install bcrypt-ts
```
### CDN
jsDelivr:
- `https://cdn.jsdelivr.net/npm/bcrypt-ts/dist/browser.mjs` (ESM)
- `https://cdn.jsdelivr.net/npm/bcrypt-ts/dist/browser.umd.js` (UMD)
unpkg:
- `https://unpkg.com/bcrypt-ts/dist/browser.mjs` (ESM)
- `https://unpkg.com/n/bcrypt-ts/dist/browser.umd.js` (UMD)
## Usage
On Node.js, the inbuilt [crypto module](http://nodejs.org/api/crypto.html)'s randomBytes interface is used to obtain secure random numbers.
### 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, the package will **throw an error**.
### How to choose between them
- If you are using this package in pure Node.js environment, then you will probably use the node bundle.
- If you are using bundler like webpack or Vite, then you will probably use the browser bundle.
- If you meet any issues where an incorrect bundle is used, you can import from `bcrypt-ts/node` and `bcrypt-ts/browser` to manually select the bundle.
### Usage - Sync
To hash a password:
```ts
import { genSaltSync, hashSync } from "bcrypt-ts";
const salt = genSaltSync(10);
const result = hashSync("B4c0//", salt);
// Store hash in your password DB
```
To check a password:
```ts
import { compareSync } from "bcrypt-ts";
// Load hash from your password DB
const hash = "xxx";
compareSync("B4c0//", hash); // true
compareSync("not_bacon", hash); // false
```
Auto-gen a salt and hash at the same time:
```ts
import { hashSync } from "bcrypt-ts";
const result = hashSync("bacon", 8);
```
### Usage - Async
To hash a password:
```ts
import { genSalt, hash } from "bcrypt-ts";
const salt = await genSalt(10);
const result = await hash("B4c0//", salt);
// Store hash in your password DB
```
To check a password:
```ts
import { compare } from "bcrypt-ts";
// Load hash from your password DB
const hash = "xxxxxx";
await compare("B4c0//", hash); // true
await compare("not_bacon", hash); // false
```
Auto-gen a salt and hash:
```ts
import { hash } from "bcrypt-ts";
const result = await hash("B4c0//", 10);
// 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
```ts
/**
* Synchronously tests a string against a hash.
*
* @param content String to compare
* @param hash Hash to test against
*/
export const compareSync: (content: string, hash: string) => boolean;
/**
* Asynchronously compares the given data against the given hash.
*
* @param content Data to compare
* @param hash Data to be compared to
* @param progressCallback Callback successively called with the percentage of rounds completed
* (0.0 - 1.0), maximally once per `MAX_EXECUTION_TIME = 100` ms.
*/
export const compare: (
content: string,
hash: string,
progressCallback?: ((percent: number) => void) | undefined,
) => Promise;
/**
* Synchronously generates a hash for the given string.
*
* @param contentString String to hash
* @param salt Salt length to generate or salt to use, default to 10
* @returns Resulting hash
*/
export const hashSync: (contentString: string, salt?: string | number) => string;
/**
* Asynchronously generates a hash for the given string.
*
* @param contentString String to hash
* @param salt Salt length to generate or salt to use
* @param progressCallback Callback successively called with the percentage of rounds completed
* (0.0 - 1.0), maximally once per `MAX_EXECUTION_TIME = 100` ms.
*/
export const hash: (
contentString: string,
salt: number | string,
progressCallback?: ((progress: number) => void) | undefined,
) => Promise;
/**
* Gets the number of rounds used to encrypt the specified hash.
*
* @param hash Hash to extract the used number of rounds from
* @returns Number of rounds used
* @throws {Error} If `hash` is not a string
*/
export const getRounds: (hash: string) => number;
/**
* Gets the salt portion from a hash. Does not validate the hash.
*
* @param hash Hash to extract the salt from
* @returns Extracted salt part
* @throws {Error} If `hash` is not a string or otherwise invalid
*/
export const getSalt: (hash: string) => string;
/**
* Synchronously generates a salt.
*
* @param rounds Number of rounds to use, defaults to 10 if omitted
* @returns Resulting salt
* @throws {Error} If a random fallback is required but not set
*/
export const genSaltSync: (rounds?: number) => string;
/**
* Asynchronously generates a salt.
*
* @param rounds Number of rounds to use, defaults to 10 if omitted
*/
export const genSalt: (rounds?: number) => Promise;
```
## Credits
- Based on [bcrypt.js](https://github.com/dcodeIO/bcrypt.js)
- Based on work started by Shane Girish at [bcrypt-nodejs](https://github.com/shaneGirish/bcrypt-nodejs)
- Based on [javascript-bcrypt](http://code.google.com/p/javascript-bcrypt/) (New BSD-licensed).