在nodejs中encryption

我试图将以下php代码移植到node.js上的javascript：

$mac = hash_hmac('SHA256', 'string', 'secret', true);
$coded = base64_encode($mac);

我已经尝试了以下内容：

var Crypto = require('crypto');
var code = Crypto.util.bytesToBase64(Crypto.HMAC(Crypto.SHA256, 'string', 'secret', { asBytes: true }));

我得到的错误：

TypeError：Object #Object没有方法'HMAC'

我是新来的node.js，我做错了什么？

更新：

var code = Crypto.createHmac（'SHA256'，secret_key）.update（to_encode）.digest（'base64'）;

Answer 1

你想要使用createHmac函数。

 Crypto.createHmac("SHA256", 'secret').update('string').digest('base64') 

Answer 2

该方法被称为createHmac

 > Crypto = require('crypto'); { Credentials: [Function: Credentials], createCredentials: [Function], Hash: [Function], createHash: [Function], Hmac: [Function], createHmac: [Function], Cipher: [Function], createCipher: [Function], createCipheriv: [Function], Decipher: [Function], createDecipher: [Function], createDecipheriv: [Function], Sign: [Function], createSign: [Function], Verify: [Function], createVerify: [Function], DiffieHellman: [Function], createDiffieHellman: [Function], pbkdf2: [Function], randomBytes: [Function], pseudoRandomBytes: [Function], rng: [Function], prng: [Function] }