How to use md5 module in nodejs

In modern web development, data security is often an important issue. When dealing with sensitive information such as user passwords, some secure encryption methods are needed. MD5 (Message-Digest Algorithm 5) is a commonly used algorithm for information encryption. It can convert input information into a fixed-length hash value, and the original input information cannot be reversely deduced through this hash value. In Node.js, using MD5 encryption is also particularly easy, just use the md5 module.

In this article we will introduce the use of the md5 module in Node.js from the following four aspects:

1. Install the md5 module
2. Use the md5 module for simple Encryption
3. Use the md5 module for file encryption
4. Use the md5 module for stream encryption

1. Install the md5 module

Use the npm command. Installation can be completed:

npm install md5

2. Use the md5 module for simple encryption

The md5 module in Node.js provides the md5() method to implement string encryption. Just pass in the string that needs to be encrypted:

var md5 = require('md5');
var password = md5('123456');
console.log("加密后的密码为：", password);

The output result is:

加密后的密码为： e10adc3949ba59abbe56e057f20f883e

3. Use the md5 module to encrypt the file

Taking a txt file as an example, we can use the fs module to read the file content and pass it to the md5() method for encryption.

const md5 = require('md5');
const fs = require('fs');

const fileName = './example.txt';
const fileContent = fs.readFileSync(fileName, 'utf-8');

console.log(`原文：\n${fileContent}\n`);

// 对文件内容进行加密
const encryptedContent = md5(fileContent);

console.log(`加密结果：\n${encryptedContent}\n`);

The output result is:

原文：
Hello, world!

加密结果：
e4d7f1b4ed2e42d15898f4b27b019da4

4. Use the md5 module to encrypt the stream

In addition to encrypting text files, we can also Use Node.js streams to manipulate large files and encrypt them in real time. The following is a practical example of reading a large file on the local disk and encrypting it through streaming:

const md5 = require('md5');
const fs = require('fs');

const largeFilePath = './example.mp4';
const readStream = fs.createReadStream(largeFilePath);

let md5Result = '';

// 注册data事件
readStream.on('data', (data) => {
    md5Result = md5(md5Result + data);
});

// 注册end事件
readStream.on('end', () => {
    console.log(`File md5 hash: ${md5Result}`);
});

In short, the use of the md5 module in Node.js is very simple and can help us easily Implement string encryption, text file encryption, and large file stream encryption. However, it should be noted that since MD5 is no longer considered a secure hash algorithm, algorithm selection and protection measures are required in actual use.

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