Node.js diffieHellman.setPrivateKey() Method
The diffieHellman.setPrivateKey() method is an inbuilt application programming interface of class DiffieHellman (dh) within the crypto module which is used to set the private key of dh object.
Syntax:
diffieHellman.setPrivateKey(privateKey[, encoding])
Parameters: This method accepts the following two parameters:
- privateKey: It is used to denote the private Key.
- encoding: It is used to denote the encoding of privateKey. If encoding is provided privateKey expected to be String otherwise Buffer, TypedArray, or DataView.
Example 1:
index.js
// Node.js program to demonstrate the // diffieHellman.setPrivateKey() Method const crypto = require('crypto') // Generate DH Key pair crypto.generateKeyPair('dh', { primeLength: 512, publicKeyEncoding: { type: 'spki', format: 'der' }, privateKeyEncoding: { type: 'pkcs8', format: 'der' } }, cb ) function cb(err, publicKey, privateKey){ // Create Diffie-Hellman instance const dh = crypto.createDiffieHellman(512) // Set the dh's privateKey dh.setPrivateKey(privateKey) if( privateKey.equals(dh.getPrivateKey()) ) console.log("DH private Key is set successfully") } |
Run index.js file using the following command
node index.js
Output:
DH private Key is set successfully
Example 2 :
index.js
// Node.js program to demonstrate the // diffieHellman.setPrivateKey() Method const crypto = require( 'crypto' ) crypto.generateKeyPair( 'dh', { primeLength: 512 }, cb ) function cb( err, publicKey, privateKey ){ // Export key from KeyObject privateKey = privateKey.export( {type: 'pkcs8', format: 'der'} ) // Encode key in base64 privateKey = privateKey.toString('base64'); // Create Diffie-Hellman instance const dh = crypto.createDiffieHellman( 512 ) // Set the dh's privateKey dh.setPrivateKey( privateKey, 'base64' ) if( privateKey === dh.getPrivateKey('base64') ) console.log( "DH private Key is set successfully" ) } |
Run index.js file using the following command
node index.js
Output:
DH private Key is set successfully
Reference: https://nodejs.org/api/crypto.html#crypto_ecdh_setprivatekey_privatekey_encoding
Contact Us