DIGITAL SIGNATURE TOOL

Digital Signature Tool *Installation* ``` bash npm install crypto ``` *Code* ``` const crypto = require('crypto'); // Generate a private key const { privateKey, publicKey } = crypto.generateKeyPairSync('rsa', { modulusLength: 2048, publicKeyEncoding: { type: 'spki', format: 'pem' }, privateKeyEncoding: { type: 'pkcs8', format: 'pem', cipher: 'aes-256-cbc', passphrase: '' } }); // Message to sign const message = "Hello, World!"; // Sign the message const sign = crypto.createSign('RSA-SHA256'); sign.update(message); sign.end(); const signature = sign.sign(privateKey, 'hex'); // Verify the signature const verify = crypto.createVerify('RSA-SHA256'); verify.update(message); verify.end(); const isValid = verify.verify(publicKey, signature, 'hex'); console.log("Signature:", signature); console.log("Is signature valid?", isValid); console.log("Public Key:"); console.log(publicKey); console.log("Private Key:"); console.log(privateKey); ``` This code generates a private key, signs a message, and verifies the signature using the corresponding public key. *Note:* This is a basic example and may not be suitable for production use without additional security measures. Always consult with a cryptography expert or follow established security guidelines when implementing digital signatures in a real-world application.