encryption - 节点js : How to encrypt and decrypt using public-private key pair using crypto module?

Question

我必须使用加密模块在 Node js 中编写代码(因为我不允许使用除 MIT 许可之外的任何模块)。我需要生成一个 key 对并使用公钥加密一些消息并使用私钥对其进行解密。第一部分即 key 对的生成已完成。我不知道如何使用加密模块使用相同的 key 对加密和解密某些消息。

Answer 1

这应该做你想做的:

const { generateKeyPairSync, publicEncrypt, privateDecrypt } = require('crypto');

//generate a key pair RSA type encryption with a .pem format
const { publicKey, privateKey } = generateKeyPairSync('rsa', {
  modulusLength: 4096,
  publicKeyEncoding: {
    type: 'spki',
    format: 'pem'
  },
  privateKeyEncoding: {
    type: 'pkcs8',
    format: 'pem',

  }
});

// print out the generated keys
console.log(`PublicKey: ${publicKey}`);
console.log(`PrivateKey: ${privateKey}`);

//message to be encrypted
var toEncrypt = "my secret text to be encrypted";
var encryptBuffer = Buffer.from(toEncrypt);

//encrypt using public key
var encrypted = publicEncrypt(publicKey,encryptBuffer);

//print out the text and cyphertext
console.log("Text to be encrypted:");
console.log(toEncrypt);
console.log("cipherText:");
console.log(encrypted.toString());

//decrypt the cyphertext using the private key
var decryptBuffer = Buffer.from(encrypted.toString("base64"), "base64");
var decrypted = privateDecrypt(privateKey,decryptBuffer);

//print out the decrypted text
console.log("decripted Text:");
console.log(decrypted.toString());

它生成可用于加密和解密消息的 key 对。