Node.js crypto.createHash()方法
原文:https://www . geesforgeks . org/node-js-crypto-create hash-method/
crypto.createHash()方法用于创建一个 Hash 对象，该对象可用于使用所述算法创建哈希摘要。
语法:
crypto.createHash( algorithm, options )
参数:该方法接受两个参数，如 avobe 所述，描述如下:
- algorithm: It depends on the accessible algorithm favored by OpenSSL version on the platform. It returns a string. Examples are sha256 , sha512 and so on.
- option: is an optional parameter, which is used to control the popular behavior. It returns an object. In addition, for a XOF hash function like "shake256", you can use the option Output Length to determine the required output length (in bytes).
返回类型:返回哈希对象。
下面的例子说明了 crypto.createHash()方法在 Node.js 中的使用:
例 1:
// Node.js program to demonstrate the
// crypto.createHash() method
// Includes crypto module
const crypto = require('crypto');
// Defining key
const secret = 'Hi';
// Calling createHash method
const hash = crypto.createHash('sha256', secret)
// updating data
.update('How are you?')
// Encoding to be used
.digest('hex');
// Displays output
console.log(hash);
输出:
df287dfc1406ed2b692e1c2c783bb5cec97eac53151ee1d9810397aa0afa0d89
例 2:
// Node.js program to demonstrate the
// crypto.createHash() method
// Defining filename
const filename = process.argv[2];
// Includes crypto and fs module
const crypto = require('crypto');
const fs = require('fs');
// Creating Hash
const hash = crypto.createHash('sha256', 'Geeksforgeeks');
// Creating read stream
const input = fs.createReadStream(filename);
input.on('readable', () => {
// Calling read method to read data
const data = input.read();
if (data)
// Updating
hash.update(data);
else
{
// Encoding and displaying filename
console.log(`${hash.digest('base64')} ${filename}`);
}
});
console.log("Program done!");
输出:
Program done!
n95mt3468ZzAIwu/bbNU7dej6CoFkDRcNaJo7rGpLF4= index.js
参考:https://nodejs . org/API/crypto . html # crypto _ crypto _ createhash _ algorithm _ options
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