The diffieHellman.getPublicKey() method is an inbuilt application programming interface of class DiffieHellman within the crypto module which is used to return the public key of dh object.
Syntax:
diffieHellman.getPublicKey([encoding])
Parameters: This method takes the encoding as a parameter.
Return Value: It returns the diffieHellman public key. If encoding is specified a string is returned, otherwise a Buffer is returned.
Example 1:
// Node.js program to demonstrate the // diffieHellman.getPublicKey() Method const crypto = require( 'crypto' )
// Instance of diffieHellman class const dh = crypto.createDiffieHellman(512); let publicKey = null
// Generate Keys dh.generateKeys() // Pass 'base64' as encoding, return String publicKey = dh.getPublicKey( 'base64' )
console.log( 'Public Key ( with encoding ): ' , publicKey, '\n' )
// Without encoding, return Buffer publicKey = dh.getPublicKey() console.log( 'Public Key ( without encoding ): ' , publicKey, '\n' )
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Run the index.js file using the following command:
node index.js
Output:
Public Key ( with encoding ): m/tuBRWr1mHOT4VzjRvcgZ+9Vtp925GS78Mdu E7DfTxAm5750700EbWzVgLZWZ8N0AQoN1xQLlgDtBsdDo1wnQ== Public Key ( without encoding ): <Buffer 9b fb 6e 05 15 ab d6 61 ce 4f 85 73 8d 1b dc 81 9f bd 56 da 7d db 91 92 ef c3 1d b8 4e c3 7d 3c 40 9b 9e f9 d3 bd 34 11 b5 b3 56 02 d9 59 9f 0d d0 04 ... >
Example 2:
// Node.js program to demonstrate the // diffieHellman.getPublicKey() Method const crypto = require( 'crypto' )
// Instances of diffieHellman class const alice = crypto.createDiffieHellman(512); const bob = crypto.createDiffieHellman( alice.getPrime(), alice.getGenerator() );
// Generate Keys alice.generateKeys() bob.generateKeys() // Alice's publicKey let aliceKey = alice.getPublicKey('base64 ')
// Bob' s publicKey
let bobKey = bob.getPublicKey( 'base64' )
// Compute secret let aliceSecret = alice.computeSecret(bobKey, 'base64' , 'base64' )
let bobSecret = bob.computeSecret(aliceKey, 'base64' , 'base64' )
if ( aliceSecret === bobSecret )
console.log( 'Symmetric key :' , aliceSecret)
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Run the index.js file using the following command:
node index.js
Output:
Symmetric key : VyeZOZm+hZQtZVp6HQdhWTkrHfZb8tR/yRiD99ljFWsnVHJNULdjnc 5oN5/mMSNqEWFqiJ0U14JYngJwXL008A==
Reference: https://nodejs.org/api/crypto.html#crypto_diffiehellman_getpublickey_encoding