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Bouncy Castle C# - Password Protect key

MemoryStream ms = new MemoryStream(privateKey);

AsymmetricKeyParameter keyparams =       Org.BouncyCastle.Security.PrivateKeyFactory.DecryptKey(password.ToCharArray(), ms);

RSAParameters rsaparams = DotNetUtilities.ToRSAParameters((RsaPrivateCrtKeyParameters)keyparams);

RSACryptoServiceProvider rsa = new RSACryptoServiceProvider();

rsa.ImportParameters(rsaparams);

return rsa;

       

X509Certificate2 cert = new X509Certificate2(pfx_bytes, password,X509KeyStorageFlags.Exportable);            

var pkey = cert.PrivateKey;

var bcCert = DotNetUtilities.FromX509Certificate(cert);    

var bcPkey = DotNetUtilities.GetKeyPair(pkey).Private;

return PrivateKeyFactory.EncryptKey(Org.BouncyCastle.Asn1.DerObjectIdentifier.Der, password.ToCharArray(), Encoding.UTF8.GetBytes(Guid.NewGuid().ToString()), 10, bcPkey);