itsnuwan/digital-signature-for-document-signing

Code sample for generating digital signature by signing a document with asymmetric key pair and verification of the signed document by using javascript crypto library

Digital signature from javascript crypto

This repository contains code sample of nodejs crypo built in library for digital signature of document signing

Read more details of javascript cypto library here

Plaform dependencies

• NodeJs >= v10.15

Files and directories

• ./keys - Directory contains sample public and private key.You MUST generate your own key for real usage.Refer keys/README.md for how to generate your own keys
• signature.txt - sign.js will write generated signature on this file.It will be overritten each time you run sign.js
• sample-doc.txt - This is a sample document to be signed.You can use any document type for this.Just change the document path of sign.js and verify.js files accordingly.
• sign.js - Code script to generate digital signature
• verify.js - Code script to verify generated gidital signature

Usage

Generate the signature by using keys/privateKey.pem for the document sample-doc.txt

node sign.js

Verify the signature generated from above step(stored in signature.txt)

node verify.js

Generating QR Code for signature.txt

Javascript library qrcode has been used to generate the qr code.

// Install library dependancy
yarn install
node QRcode.js

QR code will be saved in qr.html file.Open this file from a web brower to see the QR code.

Todos

• Write MORE Tests
• ES6

License

MIT

Free Software, Hell Yeah!