c# - .Net 使用 Bouncy CaSTLe 以编程方式签署 PKCS#10 请求

Question

我们使用 CertEnroll 在客户端上生成了一个有效的 PKCS#10 证书请求。

现在我们需要对其进行签名并将结果返回给客户端，CertEnroll 将在客户端处理本地证书存储。

这是一个 B2B 应用程序，根签名证书将自行生成，或者我们可以使用现有的 Thawte SSL 证书。

服务器 (2008) 没有运行 Active Directory，除非绝对必要，否则我们不想为此创建独立的签名基础架构/服务。不需要撤销等 - 我们希望以编程方式进行。

我很乐意使用 BouncyCaSTLe 库，但是 C# 库缺少任何有意义的文档，虽然原始 Java 文档公认相似，但 C# 实现的不同足以让我有点困惑。

是否有人知道(或拥有)示例 C#(或 VB)代码或已知可靠的相同链接，使用 BouncyCaSTLe 或就此而言使用 native .Net 类？

对于完成这件事的任何帮助，我们将不胜感激!

Answer 1

至少可以说这是一个有趣的练习:-)

我们同时使用了 BouncyCaSTLe 和 .Net 证书对象。解决方案仍然有 !much!有改进的余地，但它确实有效。

它的核心 (Cert Gen) 如下。当我们到达这里时，CSR 已经在客户端上生成，当我们离开时，生成的证书由客户端代码安装(请参阅 this blog 了解客户端工作。)

再次声明，我不是将其作为成品提供，而是希望对面临相同任务的人有一定的值(value)。快乐加密:-)

        // Jul 10, 2012 see
        // http://social.technet.microsoft.com/Forums/en-NZ/winserversecurity/thread/45781b46-3eb7-4715-b877-883bf0dc2ae7
        // instaed of CX509CertificateRequestPkcs10 csr = new CX509CertificateRequestPkcs10(); use:
        IX509CertificateRequestPkcs10 csr = (IX509CertificateRequestPkcs10)Activator.CreateInstance(Type.GetTypeFromProgID("X509Enrollment.CX509CertificateRequestPkcs10"));
        csr.InitializeDecode(csrText, EncodingType.XCN_CRYPT_STRING_BASE64);
        csr.CheckSignature(Pkcs10AllowedSignatureTypes.AllowedKeySignature);

        //get Bouncy CSRInfo Object
        Trace.Write("get Bouncy CSRInfo Object");
        Byte[] csrBytes = Convert.FromBase64String(csrText);
        CertificationRequestInfo csrInfo = CertificateTools.GetCsrInfo(csrBytes);
        SubjectPublicKeyInfo pki = csrInfo.SubjectPublicKeyInfo;

        //pub key for the signed cert
        Trace.Write("pub key for the signed cert");
        AsymmetricKeyParameter publicKey = PublicKeyFactory.CreateKey(pki);

        // Build a Version1 (No Extensions) Certificate
        DateTime startDate = DateTime.Now;
        DateTime expiryDate = startDate.AddYears(100);
        BigInteger serialNumber = new BigInteger(32, new Random());

        Trace.Write("Build a Version1 (No Extensions) Certificate");
        X509V1CertificateGenerator certGen = new X509V1CertificateGenerator();
        string signerCN = ConfigurationManager.AppSettings["signerCN"].ToString();
        X509Name dnName = new X509Name(String.Format("CN={0}", signerCN));
        X509Name cName = new X509Name(csr.Subject.Name);
        certGen.SetSerialNumber(serialNumber);
        certGen.SetIssuerDN(dnName);
        certGen.SetNotBefore(startDate);
        certGen.SetNotAfter(expiryDate);
        certGen.SetSubjectDN(cName);
        certGen.SetSignatureAlgorithm("SHA1withRSA");
        certGen.SetPublicKey(publicKey);

        //get our Private Key to Sign with
        Trace.Write("get our Private Key to Sign with");
        X509Store store = new X509Store(StoreLocation.LocalMachine);
        store.Open(OpenFlags.ReadOnly);
        string signerThumbprint = ConfigurationManager.AppSettings["signerThumbprint"].ToString();
        X509Certificate2Collection collection = (X509Certificate2Collection)store.Certificates;
        X509Certificate2Collection fcollection = (X509Certificate2Collection)collection.Find(X509FindType.FindByThumbprint, signerThumbprint, false);
        X509Certificate2 caCert = fcollection[0];

        Trace.Write("Found:" + caCert.FriendlyName);
        Trace.Write("Has Private " + caCert.HasPrivateKey.ToString());
        Trace.Write("Key Size " + caCert.PrivateKey.KeySize.ToString());

        //Get our Signing Key as a Bouncy object
        Trace.Write("Get our Signing Key as a Bouncy object from key ");
        AsymmetricCipherKeyPair caPair = DotNetUtilities.GetKeyPair(caCert.PrivateKey);

        //gen BouncyCastle object
        Trace.Write("gen BouncyCastle object");
        Org.BouncyCastle.X509.X509Certificate cert = certGen.Generate(caPair.Private);

        //convert to windows type 2 and get Base64 String
        Trace.Write("convert to windows type 2 and get Base64 String");
        X509Certificate2 cert2 = new X509Certificate2(DotNetUtilities.ToX509Certificate(cert));
        byte[] encoded = cert2.GetRawCertData();
        string certOutString = Convert.ToBase64String(encoded);

        //output to the page (hidden)
        Certificate.Value = certOutString;