CODEWITHSUNDEEP
c#.netbouncycastle
Carsten
Carsten

Reputation: 4334

Inverse operation to `PublicKeyFactory.CreateKey()`

Using Bouncycastle with C#, what is the inverse operation to:

byte[] publicKey;
AsymmetricKeyParameter asymmetricKeyParameter = PublicKeyFactory.CreateKey(publicKey);
RsaKeyParameters rsaKeyParameters = (RsaKeyParameters)asymmetricKeyParameter;

I.e. I have a RsaKeyParameters object containing a public key and want to convert it to a byte array in such a way that I could feed it back in to PublicKeyFactory.CreateKey()

Upvotes: 0

Views: 1735

Answers (1)

Peter Dettman
Peter Dettman

Reputation: 4052

The inverse operation for public keys should be:

byte[] publicKey = SubjectPublicKeyInfoFactory.CreateSubjectPublicKeyInfo(rsaKeyParameters).GetDerEncoded();

That factory class is in the Org.BouncyCastle.X509 namespace.

For private keys, the corresponding factory classes are Org.BouncyCastle.Security.PrivateKeyFactory and Org.BouncyCastle.Pkcs.PrivateKeyInfoFactory/EncryptedPrivateKeyInfoFactory.

Upvotes: 1

Related Questions