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POBouncyCastle RSAPrivateKey to .NET RSAPrivateKey
 

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    <p>I'm creating a certificate distribution system to keep track of clients and stuff.</p> <p>What happens is:</p> <ul> <li>Client send CSR to Server</li> <li>Server checks and signs certificate</li> <li>Server sends Signed certificate to Client</li> <li>Client puts Signed certificate plus Private key in Windows store.</li> </ul> <p>So on the client this happens:</p> <pre><code>//Pseudo Server Object: Server s = new Server(); //Requested Certificate Name and things X509Name name = new X509Name("CN=Client Cert, C=NL"); //Key generation 2048bits RsaKeyPairGenerator rkpg = new RsaKeyPairGenerator(); rkpg.Init(new KeyGenerationParameters(new SecureRandom(), 2048)); AsymmetricCipherKeyPair ackp = rkpg.GenerateKeyPair(); //PKCS #10 Certificate Signing Request Pkcs10CertificationRequest csr = new Pkcs10CertificationRequest("SHA1WITHRSA", name, ackp.Public, null, ackp.Private); //Make it a nice PEM thingie StringBuilder sb = new StringBuilder(); PemWriter pemwrit = new PemWriter(new StringWriter(b)); pemwrit.WriteObject(csr); pemwrit.Writer.Flush(); s.SendRequest(sb.ToSting()); </code></pre> <p>Ok So I'll skip serverside Just trust me the server signs the cert and send it back to the client. Thats where I'll pick up the action.</p> <pre><code>PemReader pr = new PemReader(new StringReader(b.ToString())); X509Certificate cert = (X509Certificate)pr.ReadObject(); //So lets asume I saved the AsymmetricCipherKeyPair (ackp) from before //I have now the certificate and my private key; //first I make it a "Microsoft" x509cert. //This however does not have a PrivateKey thats in the AsymmetricCipherKeyPair (ackp) System.Security.Cryptography.X509Certificates.X509Certificate2 netcert = DotNetUtilities.ToX509Certificate(cert); //So here comes the RSACryptoServerProvider: System.Security.Cryptography.RSACryptoServiceProvider rcsp = new System.Security.Cryptography.RSACryptoServiceProvider(); //And the privateKeyParameters System.Security.Cryptography.RSAParameters parms = new System.Security.Cryptography.RSAParameters(); //now I have to translate ackp.PrivateKey to parms; RsaPrivateCrtKeyParameters BCKeyParms = ((RsaPrivateCrtKeyParameters)ackp1.Private); //D is the private exponent parms.Modulus = BCKeyParms.Modulus.ToByteArray(); parms.P = BCKeyParms.P.ToByteArray(); parms.Q = BCKeyParms.Q.ToByteArray(); parms.DP = BCKeyParms.DP.ToByteArray(); parms.DQ = BCKeyParms.DQ.ToByteArray(); parms.InverseQ = BCKeyParms.QInv.ToByteArray(); parms.D = BCKeyParms.Exponent.ToByteArray(); parms.Exponent = BCKeyParms.PublicExponent.ToByteArray(); //Now I should be able to import the RSAParameters into the RSACryptoServiceProvider rcsp.ImportParameters(parms); //&lt;em&gt;&lt;b&gt;not really&lt;/b&gt;&lt;/em&gt; This breaks says "Bad Data" and not much more. I'll Post the //stacktrace at the end //I open up the windows cert store because thats where I want to save it. //Add it and save it this works fine without the privkey. X509Store store = new X509Store(StoreName.My, StoreLocation.CurrentUser); store.Open(OpenFlags.MaxAllowed); store.Add(netcert); store.Close(); </code></pre> <p>Now you're probably thinking there must be something going wrong at the server side. Well thats what I thought too but When I made a pfx file from this cert and imported it by hand it worked fine .... </p> <p>Somehow there's a diference bewteen a .NET RSA privatekey and a BouncyCastle RSA privatekey and I can't put my finger on it.</p> <p>You will probably suggest to import the pfx and then get the private key from it via the X509Store. I tried. :S And failed. As soon as I try to <code>ExportParameters(true)</code> the true stands for including privateparameters. It says "Key not valid for use in specified state.". See for complete exception at the end.</p> <p>I hope some of you have slain this pig before or might be able to help me.</p> <pre><code>***Exceptions:*** System.Security.Cryptography.CryptographicException was unhandled Message="Key not valid for use in specified state.\r\n" Source="mscorlib" StackTrace: at System.Security.Cryptography.CryptographicException.ThrowCryptogaphicException(Int32 hr) at System.Security.Cryptography.Utils._ExportKey(SafeKeyHandle hKey, Int32 blobType, Object cspObject) at System.Security.Cryptography.RSACryptoServiceProvider.ExportParameters(Boolean includePrivateParameters) InnerException: ***And the other one:*** System.Security.Cryptography.CryptographicException was unhandled Message="Bad Data.\r\n" Source="mscorlib" StackTrace: at System.Security.Cryptography.CryptographicException.ThrowCryptogaphicException(Int32 hr) at System.Security.Cryptography.Utils._ImportKey(SafeProvHandle hCSP, Int32 keyNumber, CspProviderFlags flags, Object cspObject, SafeKeyHandle&amp; hKey) at System.Security.Cryptography.RSACryptoServiceProvider.ImportParameters(RSAParameters parameters) InnerException: </code></pre>
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