将对象保存到JSON文件，而不是在读取后在函数中使用它

Question

我是node.js的新手，但必须在需要这个库的学生项目中使用它：https://github.com/bitchan/eccrypto.目标是使用以太坊公钥加密文件，将其保存为JSON，然后读回以使用私钥进行解密：

var fs = require('fs');
var crypto = require("crypto");
var eccrypto = require("eccrypto");
var content = fs.readFileSync('pdf_test.pdf');
var importPrivateKey = "c337ded6f56c07205fb7b391654d7d463c9e0c726869523ae6024c9bec878878"
var importPublicKey = "04730a151f545f5dcdb1c6d99fb1251f5c70f216f39ba2681bcf10db16bd582e6720bc881d51f25ffbe961df6a0af24a9d39a4db3d86a7f6b3f9bf4eaac0e4006b"
var privateKey = new Buffer(importPrivateKey, "hex");
var publicKey = new Buffer(importPublicKey, "hex");
// Encrypting the file for B.
eccrypto.encrypt(publicKey, Buffer(content)).then(function(encrypted) {
//console.log('Encrypted message ' + JSON.stringify(encrypted));
let data = JSON.stringify(encrypted);
fs.writeFileSync('encrypted.json', data);
console.log('encryption done');
let rawData = fs.readFileSync('encrypted.json')
let encryptedContent = JSON.parse(rawData);
//console.log(encryptedContent);
// B decrypting the file.
eccrypto.decrypt(privateKey, encryptedContent).then(function(plaintext) {
//console.log("Decrypted message: ", plaintext.toString());
fs.writeFile('decrypted.pdf', plaintext, function (err) {
if (err) return console.log(err);
console.log('decryption done');
});
});
});

我从这个代码中得到以下错误：；(节点：271(未处理的PromiseRejection警告：错误：输入错误"当我更换"；encryptedContent"；变量带有"；加密的"；关于eccrypto.decrypt函数，但我想让用户存储加密的对象，然后用这个函数解密它。我该怎么做？

Answer 1

问题是encrypted对象不完全是JSON可序列化的，因此您必须将缓冲区编码在某种JSON可序列化对象中。由于您使用十六进制作为私钥和公钥，我在下面也使用了它。(此外，Buffer()构造函数已取消缓存且不安全，因此我将其切换到Buffer.from()

var fs = require('fs');
var crypto = require("crypto");
var eccrypto = require("eccrypto");
var content = fs.readFileSync('pdf_test.pdf');;
var importPrivateKey = "c337ded6f56c07205fb7b391654d7d463c9e0c726869523ae6024c9bec878878"
var importPublicKey = "04730a151f545f5dcdb1c6d99fb1251f5c70f216f39ba2681bcf10db16bd582e6720bc881d51f25ffbe961df6a0af24a9d39a4db3d86a7f6b3f9bf4eaac0e4006b"
let privateKey = Buffer.from(importPrivateKey, 'hex');
let publicKey = Buffer.from(importPublicKey, 'hex');

// Encrypting the file for B.
eccrypto.encrypt(publicKey, Buffer.from(content)).then(function (encrypted) {
//console.log('Encrypted message ' + JSON.stringify(encrypted));
let data = JSON.stringify({
iv: encrypted.iv.toString('hex'),
ciphertext: encrypted.ciphertext.toString('hex'),
mac: encrypted.mac.toString('hex'),
ephemPublicKey: encrypted.ephemPublicKey.toString('hex')
});
fs.writeFileSync('encrypted.json', data);
console.log('encryption done');
let rawData = fs.readFileSync('encrypted.json')
let encryptedContent = JSON.parse(rawData);
encryptedContent = {
iv: Buffer.from(encryptedContent.iv, 'hex'),
ciphertext: Buffer.from(encryptedContent.ciphertext, 'hex'),
mac: Buffer.from(encryptedContent.mac, 'hex'),
ephemPublicKey: Buffer.from(encryptedContent.ephemPublicKey, 'hex')
}
//console.log(encryptedContent);
// B decrypting the file.
eccrypto.decrypt(privateKey, encryptedContent).then(function (plaintext) {
//console.log("Decrypted message: ", plaintext.toString());
fs.writeFile('decrypted.pdf', plaintext, function (err) {
if (err) return console.log(err);
console.log('decryption done');
});
});
});