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crypto.createDiffieHellman() Method in Node.js
The above method creates a DiffieHellman key exchange object with the help of the supplied prime value and an optional specific generator. The generator argument can hold either a string, number or Buffer value. Default value for generator is 2.
Syntax
crypto.createDiffieHelmmanGroup(prime, [primeEncoding], [generator], [generatorEncoding]
Parameters
The above parameters are described as below −
prime – The number of prime bits that will be generated. Input value is of type number.
primeEncoding – This parameter defines the encoding of the prime string. Possible input types are: string, buffer, TypedArray and DataView.
generator – Generator for generating the exchange key object. Default value: 2.
generatorEncoding – This parameter defines the generator string encoding.
Example
Create a file with name – index.js and copy the below code snippet. After creating file, use the following command to run this code as shown in the example below −
node index.js
Program Code
// crypto.createDiffieHelmmanGroup(prime, [primeEncoding],
[generator],[generatorEncoding])
// Demo Example
// Importing the crypto module
const crypto = require('crypto');
// Initializing and defining the prime value
const server = crypto.createDiffieHellman(20);
// Generating keys
server.generateKeys();
// Creating keys using server prime and generator
const client= crypto.createDiffieHellman(
server.getPrime(), server.getGenerator());
client.generateKeys();
// Printing the server and client values
console.log("Server prime: ", server.getPrime().toString('hex'), "
Server generator: ", server.getGenerator().toString('hex'));
console.log("Client prime: ", client.getPrime().toString('hex'), "
Client generator: ", client.getGenerator().toString('hex'));Output
C:\home
ode>> node index.js Server prime: 0fed0b Server generator: 02 Client prime: 0fed0b Client generator: 02
Since the arguments passed for both server and client are same. Therefore, the keys generated are also same.
Example
Let's take a look at one more example.
// crypto.createDiffieHelmmanGroup(prime, [primeEncoding],
[generator],[generatorEncoding])
// Demo Example
// Importing the crypto module
const crypto = require('crypto');
// Initializing and defining the prime value
const val = crypto.createDiffieHellman(12);
// Printing prime value for abve DiffieHellman
console.log(val.getPrime());
// Printing the generator value
console.log(val.getGenerator())Output
C:\home
ode>> node index.js <Buffer 0f 6b> <Buffer 02>
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