JavaScript:使用openpgp.js解密GnuPG加密文件的内容

JavaScript: Decrypt content of GnuPG encrypted files using openpgp.js

本文关键字：文件 加密 GnuPG 解密 使用 openpgp js JavaScript      更新时间：2023-09-26

我正在尝试使用openpgp.js.为JavaScript中的GnuPG加密文件编写一个示例解密器

所以我天真地尝试了一下，甚至没有问它是否可能。我做了下一页。

popup.html

<!doctype html>
<!--
-->
<html>
<head>
    <title>Popup</title>
    <script src="openpgp.js"></script>
    <script src="popup.js"></script>
</head>
<body>
    <p>Upload message: </p><input id="message" type="file"/><br>
    <p>Upload secret key: </p><input id="secret" type="file"/><br>
    <p>Secret key password: </p><input id="password" type="password"/><br><br>
    <button id="decrypt">Decrypt</button>
    <p id="output"></p>
    <div id="loadingDiv"></div>
</body>
</html>

popup.js

var message = "";
var secret = "";

function readMessage (e) {
    var file = e.target.files[0];
    if (!file) {
        message = "";
    }
    var reader = new FileReader();
    reader.onload = function (e) {
        message = e.target.result;
    };
    reader.readAsText (file);
}

function readSecret (e) {
    var file = e.target.files[0];
    if (!file) {
        secret = "";
    }
    var reader = new FileReader();
    reader.onload = function (e) {
        secret = e.target.result;
    };
    reader.readAsText (file);
}


function loadScript(url, callback)
{
    var head = document.getElementsByTagName ("head")[0];
    var script = document.createElement ("script");
    script.type = "text/javascript";
    script.src = url;
    script.onreadystatechange = callback;
    script.onload = callback;
    head.appendChild(script);
}

document.addEventListener ("DOMContentLoaded", function() {
    document.getElementById ("message").addEventListener("change", readMessage, false);
    document.getElementById ("secret").addEventListener("change", readSecret, false);
    var gen = function() {
        document.getElementById ("decrypt").addEventListener ("click", function() {
            var output = document.getElementById ("output");
            output.style.color = "black";
            if (document.getElementById ("message").value == "") {
                output.innerHTML = "No message provided";
                output.style.color = "red";
            }
            else if (document.getElementById ("secret").value == "") {
                output.innerHTML = "No secret key provided";
                output.style.color = "red";
            }
            else if (document.getElementById ("password").value == "") {
                output.innerHTML = "No password for secret key provided";
                output.style.color = "red";
            }
            else {
                var privateKey = openpgp.key.readArmored (secret).keys[0];
                var isCorrect = privateKey.decrypt (document.getElementById ("password").value);
                if (isCorrect) {
                    output.innerHTML = "";
                    output.style.color = "black";
                    var img = document.createElement ("img");
                    img.src = "loading.gif";
                    img.id = "loading";
                    document.getElementById ("loadingDiv").appendChild (img);
                    message = openpgp.message.readArmored (message);
                    openpgp.decryptMessage (privateKey, message).then (function (plaintext) {
                        output.innerHTML = plaintext;
                    }).catch (function(error) {
                        output.innerHTML = "Error while decrypting";
                        output.style.color = "red";
                    });
                }
                else {
                    output.innerHTML = "Incorrect password";
                    output.style.color = "red";
                }
            }
        });
    }
    loadScript ("openpgp.js", gen);
});

openpgp.js在message = openpgp.message.readArmored (message);上给出一个Unknown ASCII armor type错误。

那么这有可能吗？如果是，我应该做一些不同的事情吗？

OpenPGP知道消息的编码，

  • 二进制消息，更节省空间
  • ASCII铠装消息以类似base64的格式编码，当以纯文本形式通过不同通道传输时，提供更高的可靠性

openpgp.message.readArmored (message)只理解ASCII装甲信息。请改用openpgp.message.fromBinary (message)。作为替代方案，在加密时使用--armor选项通过GnuPG对消息进行编码，或者使用gpg --enarmor对已经加密的二进制消息进行编码。

使用Openpgpjs 3.x版本，我发现必须创建一个私钥对象，并与选项变量中的publicKey和message一起使用。私钥对象是用私钥创建的。首先创建私钥对象，然后使用"秘密"短语对其进行解密，然后解密消息。

下面是一个使用变量的示例。

 privKeyObj.decrypt(secret).then(function(oBoolean) {
      //Name oBoolean anything you want.
      //It will be true or false indicating
      //whether the secret phrase is right.
      if(!oBoolean) {
           output.innerHTML = "Incorrect password.";
           output.style.color = "red";
      } 
      else {
           var privateKey = "your openpgpjs private key created with your secret phrase";
           var privKeyObj = openpgp.key.readArmored(privateKey).keys[0];
           var options = {
                message: openpgp.message.readArmored(message),
                publicKeys: openpgp.key.readArmored(publickey).keys,
                privateKeys: [privKeyObj]
           };
           openpgp.decrypt(options).then(function(plaintext) {
                output.innerHTML = plaintext.data;
           }, function(error) {
                output.innerHTML = "Error while decrypting";
                output.style.color = "red";
           });
      }
 });
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