JS-Salsa20

Pure JavaScript Salsa20 stream cipher

Abstract

Salsa20 is a family of 256-bit stream ciphers designed in 2005 and submitted to eSTREAM, the ECRYPT Stream Cipher Project. Salsa20 has progressed to the third round of eSTREAM without any changes. The 20-round stream cipher Salsa20/20 is consistently faster than AES and is recommended by the designer for typical cryptographic applications.

Implementation derived from

• https://cr.yp.to/snuffle/salsa20/ref/salsa20.c
• The Salsa20 family of stream ciphers
• Salsa20 specification
• Salsa20 design

Install

npm install js-salsa20 --save

Usage

Encrypt message with key and nonce

import JSSalsa20 from "js-salsa20";
 
const key = Uint8Array([...]); // 32 bytes key
const nonce = Uint8Array([...]); // 8 bytes nonce
const message = Uint8Array([...]); // some data as bytes array
 
// Encrypt //
const encrypt = new JSSalsa20(key, nonce).encrypt(message);
 
// now encrypt contains bytes array of encrypted message

Decrypt encrypted message with key and nonce

import JSSalsa20 from "js-salsa20";
 
const key = Uint8Array([...]); // 32 bytes key
const nonce = Uint8Array([...]); // 8 bytes nonce
const encrypt = Uint8Array([...]); // some data as bytes array
 
// Encrypt //
const message = new JSSalsa20(key, nonce).decrypt(encrypt);
 
// now message contains bytes array of original message

That all. If something happens, Error will be thrown. More examples you can find in tests files.