Node.js diffieHellman.getGenerator() Method ❤️

The diffieHellman.getGenerator() method is an inbuilt application programming interface of class diffieHellman within the crypto module which is used to get the generator value of DiffieHellman (dh) object.

Syntax:

diffieHellman.getGenerator([encoding])

Parameters: This method takes encoding as a parameter.

Return Value: It returns the DiffieHellman generator value in the specified encoding. If no encoding provided Buffer is returned else String is returned.

Example 1:

index.js

// Node.js program to demonstrate the 
// diffieHellman.getGenerator() method 
  
// Destructure createDiffieHellman method from crypto 
const { createDiffieHellman } = require('crypto'); 
  
// Instances of the DiffieHellman class 
const dh = createDiffieHellman(512); 
  
// Generate dh's Generator 
  
// No encoding specified 
// Return Buffer 
let dhGenerator = dh.getGenerator() 
console.log('\nIs Buffer return ( encoding not specified ) : ' + 
    Buffer.isBuffer(dhGenerator)) // true 
console.log('Return value :') 
console.log(dhGenerator) 
  
// Encoding specified  
// Return String 
dhGenerator = dh.getGenerator('base64') 
console.log('\nIs Buffer return ( encoding specified ): ' + 
    Buffer.isBuffer(dhGenerator)) // true 
console.log('Return value :') 
console.log(dhGenerator) 

Run the index.js file using the following command:

node index.js

Output:

Is Buffer return ( encoding not specified ) : true
Return value :
<Buffer 02>

Is Buffer return ( encoding specified ): false
Return value :
Ag==

Example 2:

index.js

// Node.js program to demonstrate the 
// diffieHellman.getGenerator() method 
  
// Destructure createDiffieHellman method from crypto 
const { createDiffieHellman } = require('crypto'); 
  
// Generate Alice's keys... 
const alice = createDiffieHellman(512); 
  
// Generate Alices's Prime 
const alicePrime = alice.getPrime(); 
  
// Generate Alice's Generator 
const aliceGenerator =  alice.getGenerator() 
  
// Generate Alice's Key 
const aliceKey = alice.generateKeys(); 
  
// Generate Bob's keys... 
const bob = createDiffieHellman( alicePrime, aliceGenerator ); 
  
// Generate Bobs's Prime 
const bobPrime = bob.getPrime(); 
  
// Generate Bob's Generator 
const bobGenerator =  bob.getGenerator() 
  
// Generate Bob's Key 
const bobKey = bob.generateKeys(); 
  
// Exchange and generate the secret... 
const aliceSecret = alice.computeSecret(bobKey); 
const bobSecret = bob.computeSecret(aliceKey); 
  
let isSymmetric = aliceSecret.toString('hex') == bobSecret.toString('hex') 
  
console.log( `Is Symmetric key generation  
              successful : ${ isSymmetric }` ); // true

Run the index.js file using the following command:

node index.js

Output:

Is Symmetric key generation successful : true

Reference: https://nodejs.org/api/crypto.html#crypto_diffiehellman_getgenerator_encoding

Node.js diffieHellman.getGenerator() Method

index.js

index.js

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