使用来自加密的 createDecipheriv 的无效密钥长度错误答案

【问题标题】：Invalid key length error using createDecipheriv from crypto使用来自加密的 createDecipheriv 的无效密钥长度错误
【发布时间】：2020-07-21 08:51:00
【问题描述】：

我需要使用带 CBC 模式的三重 DES 编码来解密数据。上面的这段代码是最后一次尝试。当解密器被创建时，我得到了休闲错误：

Error: Invalid key length
    at Decipheriv.createCipherBase (internal/crypto/cipher.js:103:19)
    at Decipheriv.createCipherWithIV (internal/crypto/cipher.js:121:20)
    at new Decipheriv (internal/crypto/cipher.js:262:22)
    at Object.createDecipheriv (crypto.js:127:10)
    at Object.decrypt3DES (/home/didimo/projetos/node_anna_server/src/utils/exeCrypto.ts:132:25)
    at /home/didimo/projetos/node_anna_server/src/controllers/annaController.ts:67:19
    at step (/home/didimo/projetos/node_anna_server/src/controller`enter code here`s/annaController.ts:33:23)
    at Object.next (/home/didimo/projetos/node_anna_server/src/controllers/annaController.ts:14:53)
    at /home/didimo/projetos/node_anna_server/src/controllers/annaController.ts:8:71
    at new Promise (<anonymous>)

这是我的代码：

  var data = "XAWHNurb7eQRxbA/vuC09Q==";
  var iv = "O6VMaT2M9Pk=";
  var key = "UqOKIBu82BMiz4hEh+TqJpobsO9DonWo";

  var crypto = require("crypto");
  var alg = "des-ede-cbc";

  var keyBuffer64 = new Buffer(key, "base64");
  var keyBufferUtf8 = new Buffer(keyBuffer64.toString("utf8"), "utf8");

  var ivBuffer64 = new Buffer(iv, "base64");
  var ivBufferUtf8 = new Buffer(ivBuffer64.toString("utf8"), "utf8");

  var encryptedData = new Buffer(data, "base64");

  var decipher = crypto.createDecipheriv(alg, keyBufferUtf8, ivBufferUtf8);
  var decoded = decipher.update(encryptedData, "base64", "utf8");
  decoded += decipher.final("utf8");

  return decoded;

【问题讨论】：

标签： node.js cryptojs 3des cbc-mode

【解决方案1】：

3 天后，我通过反复试验发现了答案，缺少将 iv 和键值转换为十六进制。我希望这篇文章对某人有帮助，呵呵。

  var data = "aNwsjalhzHnZc0UvMjt8CA==";
  var iv = "O6VMaT2M9Pk=";
  var key = "JajN48do5d/p5EMk2AsxUiedQd7eusdK";

  var ivBufferHex = Buffer.from(iv, "base64").toString("hex");
  var keyBufferHex = Buffer.from(key, "base64").toString("hex");

  var decipher = crypto.createDecipheriv(
    "des-ede3-cbc",
    Buffer.from(keyBufferHex, "hex"),
    Buffer.from(ivBufferHex, "hex")
  );
  decipher.setAutoPadding(true);
  var decryptedData = decipher.update(data, "base64", "utf8");
  decryptedData += decipher.final("utf8");

  return decryptedData;

【讨论】：