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我正在尝试用 GAS 解密 AES。解密的目标是 Amazon Selling Partner API 检索到的文档文件。
密钥、iv和URL是通过API获取的，我想通过密钥和iv访问URL来解密下载的数据。
但是，解密后的文本要么是空的，要么是乱码。
你能告诉我下面的代码有什么问题吗？该代码使用 cCryptoGS，它是 CryptoJS 的包装库。

const decrypt_test = () => {
  const url = 'https://tortuga-prod-fe.s3-us-west-2.amazonaws.com/%2FNinetyDays/amzn1.tortuga.3.5d4685fe-cdf1-4f37-8dfc-a25b85468e34.T1J5QXLEXAMPLE';

  const response = UrlFetchApp.fetch(url);
  const file = response.getContentText();

  const key = 'xiZ8FGT6pYo49ZwfvAplJxKgO0qW46Morzs5aEXAMPLE';
  const iv = 'aoGh0rhbB3ALlCFKiEXAMPLE';
  const enc_key = cCryptoGS.CryptoJS.enc.Base64.parse(key);
  const enc_iv = cCryptoGS.CryptoJS.enc.Base64.parse(iv);
  const cipherParams = cCryptoGS.CryptoJS.lib.CipherParams.create({
      ciphertext: file//cCryptoGS.CryptoJS.enc.Base64.parse(file)
  });

  console.log(`enc_key_length:${enc_key.words.length}`);
  console.log(`enc_iv_length:${enc_iv.words.length}`);

  const decryptedMessage = cCryptoGS.CryptoJS.AES.decrypt(cipherParams, enc_key, { iv: enc_iv, mode: cCryptoGS.CryptoJS.mode.CBC}).toString();

  console.log(`decryptedMessage:${decryptedMessage}`);

  return decryptedMessage;
};

[输出]

2021/06/20 20:04:04 debug   enc_key_length:8
2021/06/20 20:04:04 debug   enc_iv_length:4
2021/06/20 20:04:04 debug   decryptedMessage:bfc095f3ecec221e8585ceb68031078d25112f5f26ea2c1f80470f5f4f19f2e1c2cd94638e8666c3486fa29191b568bcd9e8d5a3bdcbbc05456f0567bb6cdae675fa044f94e560379d16b1d370cd7c4a9c5afbbcf4fde2694ed01c1b7950eaabc65e46c4640d8f0814bfe66e8ae65f7768136ac4615624be25373d665ee8fde82742e26664d7c09c61ac8994dc3052f0f22d5042f0b407d696e3c84a3906350dc60c46001ef7865d0c6594c57c5af22616688e028f52d4f12b538d0580c420fdcb0ee61287d4ee2629cd7d39f739d63e84dd75e948eaffb4383076f0c66997
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1 回答 1

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下面的代码解决了问题

const decrypt_test = () => {
  const url = 'https://tortuga-prod-fe.s3-us-west-2.amazonaws.com/%2FNinetyDays/EXAMPLE';

  let options = {
    'method': 'get',
    'muteHttpExceptions': true,
  };

  const response = UrlFetchApp.fetch(url, options);
  
  const file = response.getBlob().getBytes();

  const key = 'xiZ8FGT6pYo49ZwfvAplJxKgO0qW46MoEXAMPLE';
  const iv = 'aoGh0rhbB3ALlCFKiuJEXAMPLE';
  const enc_key = cCryptoGS.CryptoJS.enc.Base64.parse(key);
  const enc_iv = cCryptoGS.CryptoJS.enc.Base64.parse(iv);
  const cipherParams = cCryptoGS.CryptoJS.lib.CipherParams.create({
      ciphertext: cCryptoGS.CryptoJS.enc.Hex.parse(hexes(file))
  });

  const decryptedMessage = cCryptoGS.CryptoJS.AES.decrypt(cipherParams, enc_key,
                           { iv: enc_iv, mode: cCryptoGS.CryptoJS.mode.CBC}).toString();

  console.log(`decryptedMessage:${decryptedMessage}`);

  const bin = bytes(decryptedMessage)
  const myBlob = Utilities.newBlob(bin, MimeType.TEXT, "decrypted.csv");
  DriveApp.createFile(myBlob);
};

const bytes = (hexstr) => {
  ary = [];
    for (var i = 0; i < hexstr.length; i += 2) {
      ary.push(parseInt(hexstr.substr(i, 2), 16));
  }
  return ary;
}

const hexes = (ary) => {
  return ary.map((e) => ( '00' + (e < 0 ? e += 0x0100 : e).toString(16)).slice(-2)).join('')
}
于 2021-07-11T02:30:50.787 回答