Node.js crypto.getDiffieHellman() Method
Last Updated :
11 Oct, 2021
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The crypto.getDiffieHellman() method is used to create a predefined DiffieHellmanGroup key exchange object. Here, the favored groups are 'modp1', 'modp2', 'modp5', which are defined in RFC 2412 and 'modp14', 'modp15', 'modp16', 'modp17', 'modp18', defined in RFC 3526.
Syntax:
javascript
Output:
javascript
Output:
crypto.getDiffieHellman( groupName )Parameters: This method accept single parameter groupName which is of type string. Return Type: It returns DiffieHellmanGroup key exchange object. Below examples illustrate the use of crypto.getDiffieHellman() method in Node.js: Example 1:
// Node.js program to demonstrate the
// crypto.getDiffieHellman() method
// Including crypto module
const crypto = require('crypto');
// Calling getDiffieHellman method
// with its parameter groupName
const diffiehellmangrp = crypto.getDiffieHellman('modp14');
// Prints DiffieHellmanGroup key exchange object
console.log("Key exchange object : ", diffiehellmangrp);
Key exchange object : DiffieHellmanGroup
{ _handle: { verifyError: [Getter] }, verifyError: 0 }
Example 2:
// Node.js program to demonstrate the
// crypto.getDiffieHellman() method
// Including crypto module
const crypto = require('crypto');
// Calling two getDiffieHellman method
// with its parameter, groupName
const diffiehellmangrp1 = crypto.getDiffieHellman('modp14');
const diffiehellmangrp2 = crypto.getDiffieHellman('modp14');
// Generating keys
diffiehellmangrp1.generateKeys();
diffiehellmangrp2.generateKeys();
// Computing secret
const diffiehellmangrp1sc = diffiehellmangrp1
.computeSecret(diffiehellmangrp2.getPublicKey(), null, 'hex');
const diffiehellmangrp2sc = diffiehellmangrp2
.computeSecret(diffiehellmangrp1.getPublicKey(), null, 'hex');
// Checking if both the secrets are same or not
console.log(diffiehellmangrp1sc === diffiehellmangrp2sc);
trueReference: https://nodejs.org/api/crypto.html#crypto_crypto_getdiffiehellman_groupname
