获取网站 SSL 证书的公钥 [英] Get the public key of a website's SSL certificate

问题描述

我不确定以下是否可行，因为我绝不是该主题(安全、证书等)方面的专家.

I'm not really sure about whether the following is doable or not because I'm in no way an expert on the subject (security, certificates...etc).

无论如何，我想做的是使用 C# 代码获取网站 SSL 证书的公钥.有没有办法使用 HTTP 请求或其他方式从网站查询该信息?

Anyway, what I want to do is get the Public Key of a website's SSL certificate using C# code. Like is there a way to query that information from the site using an HTTP request or something?

为了让你们理解我为什么真的想这样做，我将简要解释一下我想要实现的场景.基本上，我有很多网站使用 OAuth 2.0 来实现彼此之间的信任状态.因此，假设 Site1 向 Site2 发出请求，并向其发送了一个令牌，该令牌应该来自受信任的授权服务器.Site2 应该能够验证此令牌的真实性.

In order for you guys to understand why I really want to do so, I'll briefly explain the scenario I want to make happen. Basically I have a bunch of websites that use OAuth 2.0 to achieve a state of trust among each other. So let's say Site1 issued a request to Site2 and sent it a token which is supposedly from a trusted Authorization Server. Site2 should be able to verify the authenticity of this token.

我希望这已经足够清楚了.

I hope that was clear enough.

推荐答案

我将以下代码块用于类似目的.希望对你有帮助！！！

I use the following block of code for a similar purpose. I hope it helps!!!

        Uri u = new Uri(url);
        ServicePoint sp = ServicePointManager.FindServicePoint(u);

        string groupName = Guid.NewGuid().ToString();
        HttpWebRequest req = HttpWebRequest.Create(u) as HttpWebRequest;
        req.ConnectionGroupName = groupName;

        using (WebResponse resp = req.GetResponse())
        {

        }
        sp.CloseConnectionGroup(groupName);
        byte[] key = sp.Certificate.GetPublicKey();

        return key;

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