c# - BouncyCaSTLe C# PublicKey 不同于 GnuPG

Question

我正在尝试从 GnuPG 使用 BouncyCaSTLe C# 库创建的 key 环中获取公共(public) PGP key 。我已经通过使用以下代码使其半工作。问题在于它输出的公钥大约是真实公钥长度的一半，最后几个字节也不一样。我只是想获得真正的 key 。

更新:值得注意的一点是，我生成的 key 环只有一个公钥，但我从 bouncycaSTLe 中得到了两个。我还发现，如果将第二个 key 插入到从末尾开始的前几个字符中，它几乎会生成原始 key 。最后只有几个字符不同。那么为什么有两个键，为什么会出现这种情况呢？我错过了什么？

GnuPG key 环不兼容吗？

另请注意，此处显示的代码仅获取最后一个 key 。我现在将每个都添加到列表中。

这是我的代码:

public static string ReadKey(string pubkeyFile)
{
    string theKey;
    Stream fs = File.OpenRead(pubkeyFile);

    //
    // Read the public key rings
    //
    PgpPublicKeyRingBundle pubRings = new PgpPublicKeyRingBundle(PgpUtilities.GetDecoderStream(fs));
    fs.Close();

    foreach (PgpPublicKeyRing pgpPub in pubRings.GetKeyRings())
    {
        pgpPub.GetPublicKey();

        foreach (PgpPublicKey pgpKey in pgpPub.GetPublicKeys())
        {
            //AsymmetricKeyParameter pubKey = pgpKey.GetKey();
            //SubjectPublicKeyInfo k = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(pubKey);
            //byte[] keyData = k.ToAsn1Object().GetDerEncoded();
            //byte[] keyData = k.GetEncoded();
            byte[] keyData = pgpKey.GetEncoded();
            theKey = Convert.ToBase64String(keyData);
        }
    }
    return theKey;
}

这是实际的公钥:

-----BEGIN PGP PUBLIC KEY BLOCK-----
Version: GnuPG v2.0.20 (MingW32)
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=r3Qj
-----END PGP PUBLIC KEY BLOCK-----

这是由 BouncyCaSTLe 生成的 NEW KEY(抱歉无法帮助格式化):

mQENBFP2z94BCADKfQT9DGHm4y/VEAYGL7XiUavbv+aE7D2OZ2jCbwnx7BYzQBu863v5qYe7oH0oBOiw67VaQSjS58fSBAE8vlTkKjvRAscHJNUX9qZrQoRtpMSnrK7NCa9N2ptvof7ykF1TAgbxDSSnhwysVznYc7mx76BO6Qx8KChqEd0Yp3w2U89YkUqNqdzjB7ZIhj5hDM9f4eyHwsz0uZgyqLKK5VgNj6dHVmOHZt6+RIydRC2lGfocWKM8loPkk6GiSX9sdEm6GXxi7gV/Q3Jr0G099AFg57cWyj1eO6NC8YHLgBHwrB1IkFwiJ0x5IHZssy/XleQ1i1izc3ntWiiH24powuAhABEBAAG0H3N5bmFwczMgPHN5bmFwczNAc2FmZS1tYWlsLm5ldD6JATkEEwECACMFAlP2z94CGwMHCwkIBwMCAQYVCAIJCgsEFgIDAQIeAQIXgAAKCRD944Hz1MHUYP+AB/4r​​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

还是不一样。将两个键都放在记事本中并搜索“tNCDnS”，之后就是它们发生变化的地方。

谢谢你和我在一起。我对此已经了解得够多了，我不想为了一些糟糕的加密而丢弃整个代码。

Answer 1

您可能是 BouncyCaSTLe 对术语“keyring”的不常见用法的受害者。以下是 BouncyCaSTLe 对三个相关术语的用法:

PgpPublicKey:这是单个数学 key 的公共(public)部分，采用 PGP 格式。它不包含任何子项。

PgpPublicKeyRing:这是一个带有子 key 的加密 key 。其他程序通常将此称为 PGP key 。

PgpPublicKeyRingBundle:这是任意数量的 PgpPublicKeyRings(在 BouncyCaSTLe 中定义)。其他程序通常将此称为公钥环(没有 bundle )。

您遍历 key 环以找到所有 PgpPublicKey 对象。您解码了它们并将最后一个且仅是最后一个作为字符串返回。如果将输入和输出字符串粘贴到 pgpdump.net(必须将 BEGIN 和 END header 添加到输出)，您会发现在此过程中丢失了子项。请改用 PgpPublicKeyRing 的 GetEncoded() 方法。这应该保留所有信息并且也更容易 :-)。

此外，PGP 的 Radix 编码不仅仅是 Base64 编码。许多程序和库，包括 BC，都忽略了是否有 PGP 页眉和页脚以及基数编码包含的 CRC 校验和，而不是简单的 Base64。然而，GPG 更严格，似乎不接受没有 CRC 校验和的 ASCII armor。因此，您必须使用二进制 key (即问题代码中的 byte[] keyData)或创建适当的 PGP ASCII 装甲。我根据您的代码编辑了以下代码，以使用 BC 的 ArmoredOutputStream 实现后者:

public static string ReadKey(string pubkeyFile)
{
    Stream fs = File.OpenRead(pubkeyFile);

    //
    // Read the public key rings
    //
    PgpPublicKeyRingBundle pubRings = new PgpPublicKeyRingBundle(PgpUtilities.GetDecoderStream(fs));
    fs.Close();

    foreach (PgpPublicKeyRing pgpPub in pubRings.GetKeyRings())
    {
            using (MemoryStream ms = new MemoryStream())
            {
                using (ArmoredOutputStream aos = new ArmoredOutputStream(ms))
                    pgpPub.Encode(aos);
                return System.Text.Encoding.ASCII.GetString(ms.ToArray());
            }
    }
    return null;
}

编辑:以下是一个没有外部依赖的完整程序。它对我有用，即输出“相同!”。请运行那个确切的程序并检查它是否输出“相同!”或“差异!”。如果它输出“Same!”，那么你可以用它来修正你自己的程序代码:

using System;
using System.IO;
using Org.BouncyCastle.Bcpg.OpenPgp;

class Program
{
    private const string PGP_OVERFLOW_KEYBODY =
    "mQENBFP2z94BCADKfQT9DGHm4y/VEAYGL7XiUavbv+aE7D2OZ2jCbwnx7BYzQBu8\r\n" +
    "63v5qYe7oH0oBOiw67VaQSjS58fSBAE8vlTkKjvRAscHJNUX9qZrQoRtpMSnrK7N\r\n" +
    "Ca9N2ptvof7ykF1TAgbxDSSnhwysVznYc7mx76BO6Qx8KChqEd0Yp3w2U89YkUqN\r\n" +
    "qdzjB7ZIhj5hDM9f4eyHwsz0uZgyqLKK5VgNj6dHVmOHZt6+RIydRC2lGfocWKM8\r\n" +
    "loPkk6GiSX9sdEm6GXxi7gV/Q3Jr0G099AFg57cWyj1eO6NC8YHLgBHwrB1IkFwi\r\n" +
    "J0x5IHZssy/XleQ1i1izc3ntWiiH24powuAhABEBAAG0H3N5bmFwczMgPHN5bmFw\r\n" +
    "czNAc2FmZS1tYWlsLm5ldD6JATkEEwECACMFAlP2z94CGwMHCwkIBwMCAQYVCAIJ\r\n" +
    "CgsEFgIDAQIeAQIXgAAKCRD944Hz1MHUYP+AB/4roauazFR5lDrJBFB0YoH4VFKM\r\n" +
    "28IJtuy6OThg3cxhqI/N74sZoxtB90QQk4lcshdpwD7CIe9TCKrnhWokIdm4N91m\r\n" +
    "TGDmW7iIeM3kcPp3mj9/7hGOetESuz9JxhBQ0aHAXYk5LdHeDKyRg1KL3JvWrJ27\r\n" +
    "fioDoLLpxxdudSd2nJLhi0hAaHKnkLVl98r37AwxTigGj+J2rN47D+UepJraf8je\r\n" +
    "eZrY/RfwKJVleF1KYPIgduwX3jdiABrI4EsZP/CdbEWTvmmkFFtD4clSMsmqaXPT\r\n" +
    "a3VeaL/saScBPL93tDsjqCddcgW28hsnhzoJ7TM78j2zNcTXZjK8/tNCDnShuQEN\r\n" +
    "BFP2z94BCADmCAMIpOp518ywUlG5Pze5HdpgGiQF26XzwxUt3mPAMXBUQ7vqRMD/\r\n" +
    "zNagPXKthp/p4t0jRoFwFwF+7CqRrxkv2Rrj5OqDD7JqETY5nfRZ0Hvfi4cPkf2g\r\n" +
    "S17SVI4LSFQ/v/sISNNiI3Bo/xvpOeK+Af087j4BEe8vjFuyzf08HCglKoL6WAp8\r\n" +
    "5+Wc2vj+7EbH61YloKKNugq34AyuNh1QYml6LI04b2KR0b/qXTW8UqLvrh4YGaOp\r\n" +
    "k80l7DpBmKgGtXn8JFfU9V3sGCscSnfzDvKjqpmtKXiJFxO2pyPCN5jRKfGMOSyA\r\n" +
    "fZ21NIrBJER/WvuIAls8Tikk+wKRKXrpABEBAAGJAR8EGAECAAkFAlP2z94CGwwA\r\n" +
    "CgkQ/eOB89TB1GDDEAf+OA9hgb3FLbEtcNvkUl9wTtLaxr9nAsBowofNEITH96hV\r\n" +
    "w4i6em9Rjg29/+4JrnDhibuhsFr/F8uKoj+iZGFw2NpXHYI6yS+BLbuVj8jOkYAy\r\n" +
    "Gq34HMNWXuS1Nr4VHOxKbKmmLu8YhdYRk2KF9fPI2Qj376C69W90R/LHByCrcCg7\r\n" +
    "xmqAvO9a8Eac7Rk+Fc+5NKVw9D1rP7MqZGgIQQoh8jLiI2MblvEEahwNxA9AYs8U\r\n" +
    "PpMD0pdo93wxXIYuKc40MF4yFL9LfpPxDnf373dbYQjk3pNThQ5RagIgLNEhRow4\r\n" +
    "5x/1wcO6FMx5a/irQXnJ2o1XYRvznBeCsoyOAYbikA==";

    static void Main(string[] args)
    {
        string parsedKey = ReadKeyDirectly(PGP_OVERFLOW_KEYBODY);
        if (parsedKey != PGP_OVERFLOW_KEYBODY.Replace("\r\n",""))
            Console.WriteLine("Difference!");
        else
            Console.WriteLine("Same!");
    }

    public static string ReadKeyDirectly(string stringKeyData)
    {
        Stream fs = new MemoryStream(System.Text.Encoding.ASCII.GetBytes(stringKeyData));
        fs.Seek(0, SeekOrigin.Begin);

        PgpPublicKeyRingBundle pubRings = new PgpPublicKeyRingBundle(PgpUtilities.GetDecoderStream(fs));

        foreach (PgpPublicKeyRing pubRing in pubRings.GetKeyRings())
            return Convert.ToBase64String(pubRing.GetEncoded());
        return null;
    }
}