Public 来自 C# 通用应用程序平台证书的密钥

Question

在这篇文章中 https://blogs.windows.com/buildingapps/2015/10/13/create-more-secure-apps-with-less-effort-10-by-10/ 他们向您解释了如何安全地连接到服务器。他们检查指纹以查看证书是否合法。但是证书会随着时间的推移而变化，我检查的硬编码字符串将不再有效。

这就是我要提取 public 密钥的原因。因为我确定它不会从一个证书更改为另一个证书。

在此代码中：

        private async Task DemoSSLRoot()
    {
        // Send a get request to Bing
        HttpClient client = new HttpClient();
        Uri bingUri = new Uri("https://www.bing.com");
        HttpResponseMessage response = await client.GetAsync(bingUri);

        // Get the list of certificates that were used to validate the server's identity
        IReadOnlyList<Certificate> serverCertificates = response.RequestMessage.TransportInformation.ServerIntermediateCertificates;

        // Perform validation
        if (!ValidCertificates(serverCertificates))
        {
            // Close connection as chain is not valid
            return;
        }

        PrintResults("Validation passed\n");
        // Validation passed, continue with connection to service
    }

    private bool ValidCertificates(IReadOnlyList<Certificate> certs)
    {
        // In this example, we iterate through the certificates and check that the chain contains
        // one specific certificate we are expecting
        for (int i = 0; i < certs.Count; i++)
        {
            PrintResults("Cert# " + i + ": " + certs[i].Subject + "\n");
            byte[] thumbprint = certs[i].GetHashValue();

            // Check if the thumbprint matches whatever you are expecting
            // ‎d4 de 20 d0 5e 66 fc 53 fe 1a 50 88 2c 78 db 28 52 ca e4 74
            byte[] expected = new byte[] { 212, 222, 32, 208, 94, 102, 252, 83, 254, 26, 80, 136, 44, 120, 219, 40, 82, 202, 228, 116 };

            if (ThumbprintMatches(thumbprint, expected))
            {
                return true;
            }
        }

        return false;
    }

在 https://blogs.windows.com/buildingapps/2015/10/13/create-more-secure-apps-with-less-effort-10-by-10/#1tFDZeMtskOkOrvd.99

阅读更多内容

访问指纹非常容易。但我需要 public 键。我在互联网上搜索，我发现了非常疯狂的代码来检查我是否能够让它工作。

有人可以告诉我是否有一种简单的方法可以从 Windows 10 中的证书中提取 public 密钥？

此致。

Answer 1

X509Certificate.GetPublicKey 方法可用于通用 Windows 平台。

您可以使用例如：

var publicKey = certs[i].GetPublicKey();

或

byte[] publicKey = certs[i].GetPublicKey.EncodedKeyValue.RawData;

Answer 2

正如 Tomas 所说，有一个名为 GetPublicKey 的方法。它不包含在 API 中。刚刚注意到有一个名为 "System.Security.Cryptography.X509Certificates" 的 nuget 包，其中可以使用此方法。

谢谢！

Public 来自 C# 通用应用程序平台证书的密钥

Public Key from Certificate in C# Universal App Platform

c#

certificate

ssl-certificate

win-universal-app