node . js diffihellman . computesecret()方法

原文:https://www . geesforgeks . org/node-js-diffihellman-computesecret-method/

diffieHellman . computesecrete()方法是加密模块内 DiffieHellman 类的内置应用编程接口，用于计算 DiffieHellman (dh)密钥。

语法:

diffieHellman.computeSecret(otherPublicKey[, 
        inputEncoding][, outputEncoding])

参数:该方法接受以下参数。

• Other public key: This method takes the public key of the other party as the first parameter.
• Enter code: Specify the code of or . If other public key is not provided, it should be buffer, type data area or data view.
• Output code: If provided, the string will be returned; otherwise, the buffer will be returned.

返回值:此方法返回 diffieHellman 共享密钥。

例 1:

index . js

// Node.js program to demonstrate the
// diffieHellman.computeSecret() method

const crypto = require('crypto')

// Instance of diffieHellman class...
const alice = crypto.createDiffieHellman(512);
const bob = crypto.createDiffieHellman(
        alice.getPrime(), alice.getGenerator());

// Generate otherPublicKey
// Pass 'base64' as encoding parameter
const aliceKey = alice.generateKeys('base64');
const bobKey = bob.generateKeys('base64');

// Exchange and generate the secret...
// inputEncoding = 'base64' because otherPublicKey
// is 'base64' encoded
// Return value should be 'hex' encoded because 
// outputEncoding = 'hex' 
const aliceSecret = alice.computeSecret(bobKey, 'base64', 'hex');
const bobSecret = bob.computeSecret(aliceKey, 'base64', 'hex');

if( aliceSecret === bobSecret ) 
    console.log(`Symmetric key : ${ aliceSecret }`)

使用以下命令运行文件:

**node index.js**

*输出:*

**Symmetric key : da884ccb0e24bf7e748f66998550b
f21f96b887e1f936478cdbc63b7806bd2403fd3aa28e5dbf58
bbabeb6f829dd86453eb0985b5ff593fcf7a8e1da20256b2a**

*例 2: 再举一个不提供输出编码的例子。*

**// Node.js program to demonstrate the
// diffieHellman.computeSecret() method

const crypto = require('crypto')

// Instances of diffieHellman class
const alice = crypto.createDiffieHellman('modp15');
const bob = crypto.createDiffieHellman('modp15');

// Pass 'base64' as encoding parameter
const aliceKey = alice.generateKeys('base64');

// Pass 'hex' as encoding parameter
const bobKey = bob.generateKeys('hex');

// Pass inputEncoding = 'hex' because Bob's key 
// 'hex' encocded
// No outputEncoding provided
// Return Buffer 
const aliceSecret = alice.computeSecret(bobKey, 'hex');

// Pass inputEncoding = 'base64' because Alice's
// key 'base64' encocded 
// No outputEncoding provided
// Return Buffer
const bobSecret = bob.computeSecret(aliceKey, 'base64');

const isSymmetric = aliceSecret.equals(bobSecret)

if ( isSymmetric )
    console.log('Symmetric key : ', aliceSecret)**

使用以下命令运行文件:****

***node index.js***

*输出:***

***Symmetric key :  <Buffer 6d 1a 6c 00 34 6c>***

*例 3: 不提供输入编码的另一个例子。通过输入编码为空。***

*文件名:index . js*

【JavaScript】

**// Node.js program to demonstrate the
// diffieHellman.computeSecret() method

const crypto = require('crypto')

// Instances of diffieHellman class
const alice = crypto.createDiffieHellman('modp15');
const bob = crypto.createDiffieHellman('modp15');

// Generate Key
alice.generateKeys();
bob.generateKeys();

// Compute Secret
// inputEncoding is null
// otherPublicKey expected to be Buffer 
const aliceSecret = alice.computeSecret(
        bob.getPublicKey() , null, 'base64');

const bobSecret = bob.computeSecret(
        alice.getPublicKey(), null, 'base64');

if (aliceSecret === bobSecret)
    console.log(`Symmetric key : ${ aliceSecret }`)**

使用以下命令运行文件:****

***node index.js***

*输出:***

***Symmetric key : abLoALX9***

*参考:***

https://nodejs . org/API/crypto . html # crypto _ diffihellman _ computesecret _ other public key _ input encoding _ output en coding

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