shacrypt

shacrypt provides cross-platform support for SHA-256 crypt and SHA-512 crypt in Node.js. It does not use the Node.js crypto API. Instead, it is implemented as a Node.js addon that wraps around the C implementation programmed by Ulrich Drepper. This provides significantly increased performance.

shacrypt provides four functions:

• sha256crypt() and sha512crypt() - can be used both synchronously and asynchronously via callbacks
• sha256cryptAsync() and sha512cryptAsync() - Promise-based async functions that support ES6 async/await

Asynchronous mode is especially useful in that computation is performed in Node.js's libuv thread pool. This avoids blocking the event loop which results in better app responsiveness. The callback-based functions follow Node.js convention with the callback function provided as the final argument with the signature function(error, result){}. The async/await functions return Promises and can be used with modern async/await syntax.

Installation

npm install @vlasky/shacrypt

NOTE: You will need to have C++ build tools installed on your system to successfully install the package. If you are running under Windows, you can download Microsoft's Build Tools for Visual Studio 2017.

Usage

• Import the package:

   // CommonJS
   const shacrypt = require('@vlasky/shacrypt');
   
   // ES6 modules
   import * as shacrypt from '@vlasky/shacrypt';

• Generate password hash:

   const hash = shacrypt.sha256crypt('super password');
   // hash = $5$rounds=5000$3a1afb28e54a0391$0d6RupbpABtxCaH8WWOemYwEcToDVZXX/tHpIy6O1U3

• Validate password:

   console.log(hash === shacrypt.sha256crypt('super password', hash));
   // true

• Specify number of rounds (default is 5000):

   const hash = shacrypt.sha256crypt('super password', 10000);
   // hash = $5$rounds=10000$b2c0a3ef466b2ec7$poVvVeQAQSE.yec0LBFddzQ9kZ4UxzA5VtsZQShAyt8

• Provide your own SALT:

   const hash = shacrypt.sha256crypt('super password', 'my-salt');
   // or with iterations=10000
   const hash = shacrypt.sha256crypt('super password', 'my-salt', 10000);

Async/Await Usage

The Promise-based async functions can be used with ES6 async/await syntax:

• Basic usage with async/await:

   // CommonJS
   const shacrypt = require('@vlasky/shacrypt');
   
   // ES6 modules
   import * as shacrypt from '@vlasky/shacrypt';
   
   async function hashPassword() {
       const hash = await shacrypt.sha256cryptAsync('super password');
       console.log(hash);
       // hash = $5$rounds=5000$3a1afb28e54a0391$0d6RupbpABtxCaH8WWOemYwEcToDVZXX/tHpIy6O1U3
   }

• Validate password with async/await:

   async function validatePassword(password, hash) {
       const computedHash = await shacrypt.sha256cryptAsync(password, hash);
       return hash === computedHash;
   }

• Using SHA-512 with custom rounds:

   async function strongHash() {
       const hash = await shacrypt.sha512cryptAsync('super password', 'my-salt', 10000);
       console.log(hash);
   }

• Error handling:

   async function hashWithErrorHandling() {
       try {
           const hash = await shacrypt.sha512cryptAsync('password');
           return hash;
       } catch (error) {
           console.error('Hashing failed:', error);
       }
   }

Authors

• Vlad Lasky https://github.com/vlasky
• Oleksiy Krivoshey https://github.com/oleksiyk
• Original C code by Ulrich Drepper: http://www.akkadia.org/drepper/SHA-crypt.txt

License (MIT)

Copyright (c) 2013-2015 Oleksiy Krivoshey.

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.