C# Question
Encode a RSA public key to DER format
I need a RSA public key encoded into DER format.
The key-pair is generated using RSACryptoServiceProvider.
What I'm looking for is the c# equivalent to the java:
PublicKey pubKey = myPair.getPublic();
byte[] keyBytes = pubKey.getEncoded();
I have tried looking into BouncyCastle but got lost so if the solution is there any pointers are welcome.
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Answer Source
Using Bouncy Castle:
using Org.BouncyCastle.X509;
using Org.BouncyCastle.Security;
using Org.BouncyCastle.Crypto;
using Org.BouncyCastle.Crypto.Generators;
using Org.BouncyCastle.Crypto.Parameters;
...
var generator = new RsaKeyPairGenerator();
generator.Init (new KeyGenerationParameters (new SecureRandom(), 2048));
var keyPair = generator.GenerateKeyPair();
RsaKeyParameters keyParam = (RsaKeyParameters)keyPair.Public;
var info = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo (keyParam);
RsaBytes = info.GetEncoded();
The last three lines are the ones who take the RSA public key and export it.
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