Node.js crypto.createDiffieHellman(primeLength, generator) Method
Last Updated :
28 Apr, 2025
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The crypto.createDiffieHellman() method is used to create a Diffie-Hellman key exchange object. Also, creates prime of primeLength bits with the help of an optional specific numeric generator. Moreover, if the generator is not defined, then the value 2 is used.
Syntax:
crypto.createDiffieHellman( primeLength, generator )
Parameters: This method accepts two parameters as mentioned above and described below:
- primeLength: This parameter holds a number of primeLength.
- generator: It can hold a number, string, Buffer, TypedArray, or DataView type of data. Its default value is 2.
Return Value: It returns Diffie-Hellman key exchange object.
The below examples illustrate the use of crypto.createDiffieHellman() method in Node.js:
Example 1:
// Node.js program to demonstrate the
// crypto.createDiffieHellman() method
// Includes crypto module
const crypto = require('crypto');
// Defining prime length
const prime_length = 60;
// Creating DiffieHellman keyexchange object
let diffHell = crypto.createDiffieHellman(prime_length);
// Displays keys which are encoded
console.log(diffHell.generateKeys('base64'));
Output:
CoWIWpiwbCE=
Example 2:
// Node.js program to demonstrate the
// crypto.createDiffieHellman() method
// Includes crypto module
const crypto = require('crypto');
// Defining prime length and generator
const prime_length = 21;
const generator = 12;
// Creating DiffieHellman keyexchange
// object with all its parameter
let diffHell = crypto.createDiffieHellman(
prime_length, generator);
// Displays keys which are encoded
console.log(diffHell.generateKeys('hex'));
// Displays public and private keys
console.log("Public Key : ",
diffHell.getPublicKey('base64'));
console.log("Private Key : ",
diffHell.getPrivateKey('base64'));
Output:
086501 Public Key : CGUB Private Key : C1rL
Reference: https://nodejs.org/api/crypto.html#crypto_crypto_creatediffiehellman_primelength_generator
