不能用私钥导出生成的证书，以字节数组中的.NET 4.0 / 4.5(Cannot export g

我需要导出和导入生成与私钥证书，并从字节数组，除非我使用.NET框架4.0和4.5，我没有任何问题。我生成自签名证书BouncyCastle的库中，然后将它们转换成.NET格式（X509Certificate2对象）。不幸的是与升级到最新的一个框架，我无法导出私钥。下面是代码：

using System;
using System.Diagnostics;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using Org.BouncyCastle.Asn1.X509;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Parameters;
using Org.BouncyCastle.Crypto.Prng;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.X509;

namespace X509CertificateExport
{
    class Program
    {
        static void Main(string[] args)
        {
            var certificate = Generate();
            var exported = certificate.Export(X509ContentType.Pfx);
            var imported = new X509Certificate2(exported, (string)null, X509KeyStorageFlags.Exportable | X509KeyStorageFlags.PersistKeySet);

            Console.WriteLine("Certificate has private key: " + imported.HasPrivateKey);
            Console.ReadKey();
        }

        public static X509Certificate2 Generate()
        {
            var keyPairGenerator = new RsaKeyPairGenerator();
            var secureRandom = new SecureRandom(new CryptoApiRandomGenerator());
            keyPairGenerator.Init(new KeyGenerationParameters(secureRandom, 1024));
            var keyPair = keyPairGenerator.GenerateKeyPair();
            var publicKey = keyPair.Public;
            var privateKey = (RsaPrivateCrtKeyParameters)keyPair.Private;

            var generator = new X509V3CertificateGenerator();
            generator.SetSerialNumber(BigInteger.ProbablePrime(120, new Random()));
            generator.SetSubjectDN(new X509Name("CN=Test"));
            generator.SetIssuerDN(new X509Name("CN=Test"));
            generator.SetNotAfter(DateTime.Now + new TimeSpan(10, 10, 10, 10));
            generator.SetNotBefore(DateTime.Now.Subtract(new TimeSpan(7, 0, 0, 0)));
            generator.SetSignatureAlgorithm("MD5WithRSA");
            generator.SetPublicKey(publicKey);

            var newCert = generator.Generate(privateKey);
            var dotNetPrivateKey = ToDotNetKey(privateKey);
            var dotNetCert = new X509Certificate2(DotNetUtilities.ToX509Certificate(newCert));
            dotNetCert.PrivateKey = dotNetPrivateKey;

            return dotNetCert;
        }

        public static AsymmetricAlgorithm ToDotNetKey(RsaPrivateCrtKeyParameters privateKey)
        {
            var rsaProvider = new RSACryptoServiceProvider();
            var parameters = new RSAParameters
            {
                Modulus = privateKey.Modulus.ToByteArrayUnsigned(),
                P = privateKey.P.ToByteArrayUnsigned(),
                Q = privateKey.Q.ToByteArrayUnsigned(),
                DP = privateKey.DP.ToByteArrayUnsigned(),
                DQ = privateKey.DQ.ToByteArrayUnsigned(),
                InverseQ = privateKey.QInv.ToByteArrayUnsigned(),
                D = privateKey.Exponent.ToByteArrayUnsigned(),
                Exponent = privateKey.PublicExponent.ToByteArrayUnsigned()
            };

            rsaProvider.ImportParameters(parameters);
            return rsaProvider;
        }
    }
}

细看来生成的证书后，我注意到，PrivateKey.CspKeyContainerInfo.Exportable标志是.NET Framework 3.5的事实，但对于以后的版本，它抛出：

'Exportable' threw an exception of type
'System.Security.Cryptography.CryptographicException' / Key does not exist

我看到的唯一区别是在PrivateKey.CspKeyContainerInfo.m_parameters.Flags：.NET 3.5 - “NoFlags”; .NET 4.5 - 'CreateEphemeralKey'。文件指出，“CreateEphemeralKey”创建时的相关RSA对象关闭时释放临时密钥。它与4.0框架引入之前并不存在。我试图获得通过明确创建CspParameters摆脱掉这个标志：

public static AsymmetricAlgorithm ToDotNetKey(RsaPrivateCrtKeyParameters privateKey)
{
    var cspParams = new CspParameters
    {
        Flags = CspProviderFlags.UseMachineKeyStore
    };

    var rsaProvider = new RSACryptoServiceProvider(cspParams);
    // ...

但没有运气。 “CreateEphemeralKey”无论如何添加，所以我得到的结果UseMachineKeyStore | CreateEphemeralKey UseMachineKeyStore | CreateEphemeralKey标志，我不知道怎样才能将其删除。有没有一种方法，我可以忽略此标志和出口与正常私钥证书？

我还没有注意到， CspKeyContainerInfo.CspParameters.KeyContainerName是在.NET 4.0和.NET 4.5密钥创建后空的，但它是自动生成.NET 3.5中。我给自己定的集装箱的唯一名称，现在我能够导出私钥。

public static AsymmetricAlgorithm ToDotNetKey(RsaPrivateCrtKeyParameters privateKey)
{
    var cspParams = new CspParameters
    {
          KeyContainerName = Guid.NewGuid().ToString(),
          KeyNumber = (int)KeyNumber.Exchange,
          Flags = CspProviderFlags.UseMachineKeyStore
    };

    var rsaProvider = new RSACryptoServiceProvider(cspParams);
    // ...