node . js diffihellman . getgenerator()方法
原文:https://www . geesforgeks . org/node-js-diffihellman-get generator-method/
DiffieHellman . GetGenerator()方法是加密模块中类 diffieHellman 的内置应用编程接口，用于获取 DiffieHellman (dh)对象的生成器值。
语法:
diffieHellman.getGenerator([encoding])
参数:该方法以编码为参数。
返回值:返回指定编码的 DiffieHellman 生成器值。如果不返回缓冲区提供的编码，则返回字符串。
例 1:
index . js
// Node.js program to demonstrate the
// diffieHellman.getGenerator() method
// Destructure createDiffieHellman method from crypto
const { createDiffieHellman } = require('crypto');
// Instances of the DiffieHellman class
const dh = createDiffieHellman(512);
// Generate dh's Generator
// No encoding specified
// Return Buffer
let dhGenerator = dh.getGenerator()
console.log('\nIs Buffer return ( encoding not specified ) : ' +
Buffer.isBuffer(dhGenerator)) // true
console.log('Return value :')
console.log(dhGenerator)
// Encoding specified
// Return String
dhGenerator = dh.getGenerator('base64')
console.log('\nIs Buffer return ( encoding specified ): ' +
Buffer.isBuffer(dhGenerator)) // true
console.log('Return value :')
console.log(dhGenerator)
使用以下命令运行 index.js 文件:
node index.js
输出:
Is Buffer return ( encoding not specified ) : true
Return value :
<Buffer 02>
Is Buffer return ( encoding specified ): false
Return value :
Ag==
例 2:
index . js
// Node.js program to demonstrate the
// diffieHellman.getGenerator() method
// Destructure createDiffieHellman method from crypto
const { createDiffieHellman } = require('crypto');
// Generate Alice's keys...
const alice = createDiffieHellman(512);
// Generate Alices's Prime
const alicePrime = alice.getPrime();
// Generate Alice's Generator
const aliceGenerator = alice.getGenerator()
// Generate Alice's Key
const aliceKey = alice.generateKeys();
// Generate Bob's keys...
const bob = createDiffieHellman( alicePrime, aliceGenerator );
// Generate Bobs's Prime
const bobPrime = bob.getPrime();
// Generate Bob's Generator
const bobGenerator = bob.getGenerator()
// Generate Bob's Key
const bobKey = bob.generateKeys();
// Exchange and generate the secret...
const aliceSecret = alice.computeSecret(bobKey);
const bobSecret = bob.computeSecret(aliceKey);
let isSymmetric = aliceSecret.toString('hex') == bobSecret.toString('hex')
console.log( `Is Symmetric key generation
successful : ${ isSymmetric }` ); // true
使用以下命令运行 index.js 文件:
node index.js
输出:
Is Symmetric key generation successful : true
参考:https://nodejs . org/API/crypto . html # crypto _ diffihellman _ getgenerator _ encoding
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