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crypto.getDiffieHellman() Method in Node.js
The crypto.createDiffieHellmanGroup() is used for creating a pre-determined DiffieHellmanGroup key exchange object. Some of the supported DiffieHellmanGroups are: modp1, modp2, modp5, modp 14, modp16, modp17 etc. The benefit of using this method is that the parties don't need to generate or exchange a group modulus thus saving processing time.
Syntax
crypto.getDiffieHelmmanGroup(groupName)
Parameters
The above parameters are described as below −
groupName – It takes the input for the group name. The input is of type 'string'.
Example
Create a file with name – getdiffieHellman.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 getDiffieHellman.js
getdiffieHellman.js
// crypto.getDiffieHellman() Demo Example
// Importing the crypto module
const crypto = require('crypto');
const server = crypto.getDiffieHellman('modp1');
const client = crypto.getDiffieHellman('modp1');
// Printing DiffieHellman values
console.log(server);
console.log(client);
// Generating public and private keys
server.generateKeys();
client.generateKeys();
// Gettong public key
const serverSecret = server.computeSecret(client.getPublicKey(), null, 'hex');
const clientSecret = client.computeSecret(server.getPublicKey(), null, 'hex');
/* aliceSecret and bobSecret should be the same */
console.log(serverSecret === clientSecret);Output
C:\home
ode>> node getDiffieHellman.js DiffieHellmanGroup { _handle: { verifyError: [Getter] }, verifyError: 0 } DiffieHellmanGroup { _handle: { verifyError: [Getter] }, verifyError: 0 } true
Example
Let's take a look at one more example.
// crypto.getDiffieHellman() Demo Example
// Importing the crypto module
const crypto = require('crypto');
const dh1 = crypto.getDiffieHellman('modp17');
const dh2 = crypto.getDiffieHellman('modp14');
// Generating public and private keys
dh1.generateKeys();
dh2.generateKeys();
// Gettong public key
const dh1Key = dh1.computeSecret(dh2.getPublicKey(), null, 'hex');
const dh2Key = dh2.computeSecret(dh1.getPublicKey(), null, 'hex');
/* aliceSecret and bobSecret should be the same */
console.log(dh1Key === dh2Key);Output
C:\home
ode>> node getDiffieHellman.js internal/crypto/diffiehellman.js:102 const ret = this._handle.computeSecret(toBuf(key, inEnc)); ^ Error: Supplied key is too large at DiffieHellmanGroup.dhComputeSecret [as computeSecret] (internal/crypto/diffiehellman.js:102:28) at Object.<anonymous> (/home/node/test/getDiffieHellman .js:15:20) at Module._compile (internal/modules/cjs/loader.js:778:30) at Object.Module._extensions..js (internal/modules/cjs/loader.js:789:10) at Module.load (internal/modules/cjs/loader.js:653:32) at tryModuleLoad (internal/modules/cjs/loader.js:593:12) at Function.Module._load (internal/modules/cjs/loader.js:585:3) at Function.Module.runMain (internal/modules/cjs/loader.js:831:12) at startup (internal/bootstrap/node.js:283:19) at bootstrapNodeJSCore (internal/bootstrap/node.js:623:3)
Updated on: 20-May-2021
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