Node.js中加密和解密数据

发表于： 2022年9月28日 2022年9月28日
分类： Javascript

mkdir crypto && cd crypto
npm init -y
npm install crypto --save

const crypto = require('crypto');

const algorithm = 'aes-256-ctr';
const secretKey = 'vOVH6sdmpNWjRRIqCc7rdxs01lwHzfr3';
const iv = crypto.randomBytes(16);

const encrypt = (text) => {

    const cipher = crypto.createCipheriv(algorithm, secretKey, iv);

    const encrypted = Buffer.concat([cipher.update(text), cipher.final()]);

    return {
        iv: iv.toString('hex'),
        content: encrypted.toString('hex')
    };
};

const decrypt = (hash) => {

    const decipher = crypto.createDecipheriv(algorithm, secretKey, Buffer.from(hash.iv, 'hex'));

    const decrpyted = Buffer.concat([decipher.update(Buffer.from(hash.content, 'hex')), decipher.final()]);

    return decrpyted.toString();
};

module.exports = {
    encrypt,
    decrypt
};

加密和解密缓冲区
您也可以使用上面定义的功能对缓冲区进行加密和解密。只需传递缓冲区代替字符串，它应该可以工作：
crypto-buffer.js

const { encrypt, decrypt } = require('./crypto');

const hash = encrypt(Buffer.from('Hello World!', 'utf8'));

console.log(hash);

// {
//     iv: '692e44dbbea073fc1a8d1c37ea68dffa',
//     content: 'bbffd902d55d7a00f3a0504e'
// }

const text = decrypt(hash);

console.log(text); // Hello World!

加密和解密流
您还可以使用加密模块对流进行加密和解密，如以下示例所示：
crypto-stream.js

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

const algorithm = 'aes-256-ctr';
const secretKey = 'vOVH6sdmpNWjRRIqCc7rdxs01lwHzfr3';
const iv = crypto.randomBytes(16);

// input file
const r = fs.createReadStream('file.txt');

// encrypt content
const encrypt = crypto.createCipheriv(algorithm, secretKey, iv);

// decrypt content
const decrypt = crypto.createDecipheriv(algorithm, secretKey, iv);

// write file
const w = fs.createWriteStream('file.out.txt');

// start pipe
r.pipe(encrypt)
    .pipe(decrypt)
    .pipe(w);

https://cloud.tencent.com/developer/article/1732824
https://github.com/attacomsian/code-examples/tree/master/nodejs/crypto

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