使用 Node-RSA 实现 RSA 加密方案

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使用 Node-RSA 实现 RSA 加密方案

Node 端解密

1. 生成私钥并储存为 pem 文件

const k = new NodeRSA({ b: 512 }); //512 数字越大 越难破解 但是时间会长
const data = k.generateKeyPair();
const privateKey = data.exportKey("pkcs8-private-pem");
fs.writeFileSync("privateKey.pem", privateKey, { encoding: "utf-8" });

2. 根据私钥生成公钥

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

3. 对密文解密

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 文件

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;
  }
}