I am developing a feature to digital sign some content. I have valid certificate with a private key. How to digital sign using the private key and bouncy castle?
I tried the following but want some right way to achieve the same using bouncy castle:
X509Certificate2 signingCert =
var rsaObj = (RSACryptoServiceProvider)signingCert.PrivateKey;
_privateKey = rsaObj.ExportParameters(true);
I don´t know exactly what you need based on your code, but there X509 namespace/code is at
bcgit/bc-csharp - X509 and there is an utility class for conversion between
bcgit/bc-csharp - DotNetUtilities.cs
BouncyCastle got lots of test (and examples). Have a look at bcgit/bc-csharp - TestCertificateGen.cs too. Maybe this helps you.
EDIT: In general it should go something like this
using Org.BouncyCastle.Crypto; using Org.BouncyCastle.OpenSsl; using Org.BouncyCastle.Security; using Org.BouncyCastle.X509; // Your loaded certificate X509Certificate cert = null; // Your loaded RSA key AsymmetricKeyParameter privateKey = null; AsymmetricKeyParameter publicKey = cert.GetPublicKey(); ISigner signer = SignerUtilities.GetSigner(cert.SigAlgName); // Init for signing, you pass in the private key signer.Init(true, privateKey); // Init for verification, you pass in the public key signer.Init(false, publicKey);