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node.js - 如何在nodejs中加密和解密字符串/对象

问题描述

我想加密一个对象然后解密它。加密效果很好，但解密失败。在我的代码下面：

crypto_ext.js

const crypto = require("crypto")
const password = "shared_key"
const algorithm = "aes256"

export const encrypt = (text) => {
    if(!text) return ''
    const cipher = crypto.createCipher(algorithm, password);
    let crypted = cipher.update(text, 'utf-8', 'base64');
    crypted += cipher.final('base64');
    return crypted;
}

export const decrypt = (text) => {
    if(!text) return ''
    const decipher = crypto.createDecipher(algorithm, password);
    let decrypted = decipher.update(text, 'base64', 'utf-8');
    decrypted += decipher.final('utf-8');
    return decrypted;
}

在我的test.js中，我有：

import {encrypt, decrypt} from './crypto_ext.js'
let test = {key1: val1, key2: val2}
test = encrypt(JSON.stringify(test)) || test
console.log("Encrypt : ", test)
console.log("Decrypt : ", decrypt(test)) // I should have my object as string here

这就是我得到的错误：

Uncaught Error: unable to decrypt data
at unpad (decrypter.js:83)
at Decipher.webpackJsonp../node_modules/browserify-aes/decrypter.js.Decipher._final (decrypter.js:38)
at Decipher.webpackJsonp../node_modules/cipher-base/index.js.CipherBase._finalOrDigest (index.js:76)
at decrypt (crypto_ext.js:17)
...

你能告诉我我做错了什么吗？

标签： node.jsencryptioncryptojsnode-crypto

解决方案

依赖：crypto包

您可以使用以下代码实现编码和解码：-

   const crypto = require('crypto');
        var password = 'ojisdasjdsjabdjs';
        var iv = 'kiamdksndn';

        function sha1(input) {
            return crypto.createHash('sha1').update(input).digest();
        }

        function password_derive_bytes(password, salt, iterations, len) {
            var key = Buffer.from(password + salt);
            for (var i = 0; i < iterations; i++) {
                key = sha1(key);
            }
            if (key.length < len) {
                var hx = password_derive_bytes(password, salt, iterations - 1, 20);
                for (var counter = 1; key.length < len; ++counter) {
                    key = Buffer.concat([key, sha1(Buffer.concat([Buffer.from(counter.toString()), hx]))]);
                }
            }
            return Buffer.alloc(len, key);
        }


        async function encode(string) {
            var key = password_derive_bytes(password, '', 100, 32);
            var cipher = crypto.createCipheriv('aes-256-cbc', key, Buffer.from(iv));
            var part1 = cipher.update(string, 'utf8');
            var part2 = cipher.final();
            const encrypted = Buffer.concat([part1, part2]).toString('base64');
            return encrypted;
        }

        async function decode(string) {
            var key = password_derive_bytes(password, '', 100, 32);
            var decipher = crypto.createDecipheriv('aes-256-cbc', key, Buffer.from(iv));
            var decrypted = decipher.update(string, 'base64', 'utf8');
            decrypted += decipher.final();
            return decrypted;
        }

然后调用下面的函数进行编码和解码

对于编码

await encode(JSON.stringify({'title': 'some text'}));

用于解码

await decode('encoded_string_to_decode');

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