crypto.getDiffieHellman(groupName)

• groupName <string>
• 返回: <DiffieHellmanGroup>

创建一个预定义的 DiffieHellmanGroup 密钥交换对象。支持的组在 DiffieHellmanGroup 的文档中列出。

【Creates a predefined DiffieHellmanGroup key exchange object. The supported groups are listed in the documentation for DiffieHellmanGroup.】

返回的对象模拟由crypto.createDiffieHellman()创建的对象的接口，但不允许更改键（例如使用diffieHellman.setPublicKey()）。使用这种方法的优点是各方不必事先生成或交换群模，从而节省处理器和通信时间。

【The returned object mimics the interface of objects created by crypto.createDiffieHellman(), but will not allow changing the keys (with diffieHellman.setPublicKey(), for example). The advantage of using this method is that the parties do not have to generate nor exchange a group modulus beforehand, saving both processor and communication time.】

示例（获取共享密钥）：

【Example (obtaining a shared secret):】

const {
  getDiffieHellman,
} = await import('node:crypto');
const alice = getDiffieHellman('modp14');
const bob = getDiffieHellman('modp14');

alice.generateKeys();
bob.generateKeys();

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

/* aliceSecret and bobSecret should be the same */
console.log(aliceSecret === bobSecret);const {
  getDiffieHellman,
} = require('node:crypto');

const alice = getDiffieHellman('modp14');
const bob = getDiffieHellman('modp14');

alice.generateKeys();
bob.generateKeys();

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

/* aliceSecret and bobSecret should be the same */
console.log(aliceSecret === bobSecret);拷贝