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copied!<p>This is what worked for me. Should also work for you:</p> <pre><code>using System; using System.IO; using System.Security.Cryptography; using System.Security.Cryptography.X509Certificates; using System.Text; using Org.BouncyCastle.Crypto; using Org.BouncyCastle.OpenSsl; using Org.BouncyCastle.Security; namespace SO6258771 { class Program { static void Main() { // Load your certificate from file X509Certificate2 certificate = new X509Certificate2("filename.pfx", "password", X509KeyStorageFlags.Exportable | X509KeyStorageFlags.PersistKeySet); // Now you have your private key in binary form as you wanted // You can use rsa.ExportParameters() or rsa.ExportCspBlob() to get you bytes // depending on format you need them in RSACryptoServiceProvider rsa = (RSACryptoServiceProvider)certificate.PrivateKey; // Just for lulz, let's write out the PEM representation of the private key // using Bouncy Castle, so that we are 100% sure that the result is exaclty the same as: // openssl pkcs12 -in filename.pfx -nocerts -out privateKey.pem // openssl.exe rsa -in privateKey.pem -out private.pem // You should of course dispose of / close the streams properly. I'm skipping this part for brevity MemoryStream memoryStream = new MemoryStream(); TextWriter streamWriter = new StreamWriter(memoryStream); PemWriter pemWriter = new PemWriter(streamWriter); AsymmetricCipherKeyPair keyPair = DotNetUtilities.GetRsaKeyPair(rsa); pemWriter.WriteObject(keyPair.Private); streamWriter.Flush(); // Here is the output with ---BEGIN RSA PRIVATE KEY--- // that should be exactly the same as in private.pem Console.Write(Encoding.ASCII.GetString(memoryStream.GetBuffer())); } } } </code></pre>

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