Get Private Key from BouncyCastle X509 Certificate? C#

c# x509certificate bouncycastle private-key
Petey B picture Petey B · Jul 13, 2010 · Viewed 37.4k times · Source

Normally when I grab an X509Certificate2 out of my keystore I can call .PrivateKey to retrieve the cert's private key as an AsymmetricAlgorithm. However I have decided to use Bouncy Castle and its instance of X509Certificate only has a getPublicKey(); I cannot see a way to get the private key out of the cert. Any ideas?

I get the an X509Certificate2 from my Windows-MY keystore then use:

//mycert is an X509Certificate2 retrieved from Windows-MY Keystore
X509CertificateParser certParser = new X509CertificateParser();
X509Certificate privateCertBouncy = certParser.ReadCertificate(mycert.GetRawCertData());
AsymmetricKeyParameter pubKey = privateCertBouncy.GetPublicKey();
//how do i now get the private key to make a keypair?

Is there anyway to convert a AsymmetricAlgorithm(C# private key) to a AsymmetricKeyParameter(bouncycastle private key)?

Answer

majkinetor picture majkinetor · Sep 16, 2011 
Akp = Org.BouncyCastle.Security.DotNetUtilities.GetKeyPair(this.Certificate.PrivateKey).Private;

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