Node.js crypto.createECDH() Method

Last Updated : 11 Oct, 2021

The crypto.createECDH() method is an inbuilt application programming interface of crypto module which is used to create an Elliptic Curve Diffie-Hellman i.e, (ECDH) key exchange object with the help of a predefined curve which is defined by the curveName string. Moreover you can use crypto.getCurves() method in order to return the list of available curve names.

Syntax:

crypto.createECDH( curveName )

Parameters: This method accepts single parameters curveName which is of type string.

Return Value: It returns ECDH key exchange object.

Below examples illustrate the use of crypto.createECDH() method in Node.js:

Example 1:

   // Node.js program to demonstrate the  
// crypto.createECDH() method 
  
// Including crypto module 
const crypto = require('crypto'); 
  
// Creating ECDH with curve name 
const curv = crypto.createECDH('secp521r1'); 
  
// Prints keys 
console.log(curv.generateKeys()); 
 
  

Output:

  <Buffer 04 01 0a cd d0 94 80 31 e8 ... >

Example 2:

   // Node.js program to demonstrate the  
// crypto.createECDH() method 
  
// Including crypto module 
const crypto = require('crypto'); 
  
// Creating ECDH with curve name 
const curv = crypto.createECDH('secp521r1'); 
curv.generateKeys(); 
  
// Prints Public key 
console.log("Public Key: ", curv.getPublicKey()); 
  
// Prints Private Key 
console.log("Private Key :", curv.getPrivateKey()); 
 
  

Output:

  Public Key: <Buffer 04 01 68 25 14 c8 ... >  Private Key : <Buffer 01 7a ab 4d 71 60 ... >

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

Node.js crypto.createDecipheriv() Method

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