BouncyCastle PrivateKey To X509Certificate2 PrivateKey

Question

我使用BouncyCastle创建证书

        var keypairgen = new RsaKeyPairGenerator();
        keypairgen.Init(new KeyGenerationParameters(new SecureRandom(new CryptoApiRandomGenerator()), 1024));

        var keypair = keypairgen.GenerateKeyPair();

        var gen = new X509V3CertificateGenerator();

        var CN = new X509Name("CN=" + certName);
        var SN = BigInteger.ProbablePrime(120, new Random());

        gen.SetSerialNumber(SN);
        gen.SetSubjectDN(CN);
        gen.SetIssuerDN(CN);
        gen.SetNotAfter(DateTime.Now.AddYears(1));
        gen.SetNotBefore(DateTime.Now.Subtract(new TimeSpan(7,0,0,0)));
        gen.SetSignatureAlgorithm("MD5WithRSA");
        gen.SetPublicKey(keypair.Public);

        gen.AddExtension( 
            X509Extensions.AuthorityKeyIdentifier.Id, 
            false, 
            new AuthorityKeyIdentifier( 
                SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(keypair.Public), 
                new GeneralNames(new GeneralName(CN)), 
                SN 
            )); 

        gen.AddExtension( 
            X509Extensions.ExtendedKeyUsage.Id, 
            false, 
            new ExtendedKeyUsage(new ArrayList() 
            { 
                new DerObjectIdentifier("1.3.6.1.5.5.7.3.1") 
            }));

        var newCert = gen.Generate(keypair.Private);

以以下方式结束

X509Certificate2 certificate = new X509Certificate2(DotNetUtilities.ToX509Certificate((Org.BouncyCastle.X509.X509Certificate)newCert));

现在，因为我的赋值告诉我在X509Certificate2对象中存储证书和PrivateKey，所以我需要一种将keypair.Private转换为X509Certificate2.Private的方法。有什么想法吗？

谢谢。

Answer 1

如果您查看来自this question的链接，您应该能够使用类似于DotNetUtilities.ToRSA(...)的东西，并将其返回值放入X509Certificate2的PrivateKey中。

Answer 2

详细一点，这是创建X509Certificate2证书后要添加的完整代码：

RSA rsaPriv = DotNetUtilities.ToRSA(keypair.Private as RsaPrivateCrtKeyParameters);
certificate.PrivateKey = rsaPriv;

(当然可以将其优化为一行。)

Answer 3

对于任何试图将X509Certificate2导出到PKCS12并保留私钥的人。这就是我不得不做的：

        // Convert BouncyCastle X509 Certificate to .NET's X509Certificate
        var cert = DotNetUtilities.ToX509Certificate(certificate);
        var certBytes = cert.Export(X509ContentType.Pkcs12, "password");

        // Convert X509Certificate to X509Certificate2
        var cert2 = new X509Certificate2(certBytes, "password");

        // Convert BouncyCastle Private Key to RSA
        var rsaPriv = DotNetUtilities.ToRSA(issuerKeyPair.Private as RsaPrivateCrtKeyParameters);

        // Setup RSACryptoServiceProvider with "KeyContainerName" set
        var csp = new CspParameters();
        csp.KeyContainerName = "KeyContainer";

        var rsaPrivate = new RSACryptoServiceProvider(csp);

        // Import private key from BouncyCastle's rsa
        rsaPrivate.ImportParameters(rsaPriv.ExportParameters(true));

        // Set private key on our X509Certificate2
        cert2.PrivateKey = rsaPrivate;

        // Export Certificate with private key
        File.WriteAllBytes(@"C:\Temp\cert.pfx", cert2.Export(X509ContentType.Pkcs12, "password"));