Implementing RSA Encryption Scheme using Node-RSA

Node-side Decryption

1. Generate private key and save it as a pem file

const k = new NodeRSA({ b: 512 }); // 512 The larger the number, the harder it is to crack, but it takes longer
const data = k.generateKeyPair();
const privateKey = data.exportKey("pkcs8-private-pem");
fs.writeFileSync("privateKey.pem", privateKey, { encoding: "utf-8" });

2. Generate public key from the private key

NodeRSA(privateKey).exportKey("pkcs8-public-pem");

3. Decrypt ciphertext

const privateKey = RsaUtil.generateKey();
const k = new nodeRsa(privateKey);
k.setOptions({
  signingScheme: "pss-sha1",
  encryptionScheme: "pkcs1_oaep",
});

const info = k.decrypt(ciphertext, "utf8");

3. RsaUtil File

import * as nodeRsa from "node-rsa";
import NodeRSA = require("node-rsa");
import * as fs from "node:fs";

export class RsaUtil {
  static getPublicKey(): string {
    const privateKey = this.generateKey();
    return new NodeRSA(privateKey).exportKey("pkcs8-public-pem");
  }

  static generateKey(): string {
    if (fs.existsSync("privateKey.pem")) {
      const privateKey = fs.readFileSync("privateKey.pem", {
        encoding: "utf-8",
      });
      return privateKey;
    }

    const k = new nodeRsa({ b: 512 });
    const data = k.generateKeyPair();
    const privateKey = data.exportKey("pkcs8-private-pem");
    fs.writeFileSync("privateKey.pem", privateKey, { encoding: "utf-8" });
    return privateKey;
  }
}

JAVA-side Encryption (Mainly Android)

AI Translation | AI 翻译

This article was translated from Chinese to English by AI. If there are any inaccuracies, please refer to the original Chinese version.


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