Using BouncyCastle to augment the .NET RSACryptoServiceProvider class

Continuing my detour into cryptography …

While the RSACryptoServiceProvider class allows SHA512 signing, it does not allow SHA512 encryption / decryption.

The BouncyCastle (BC) library does. The issue is how to convert a RSACryptoServiceProvider key to a BC one. The main issue is that the RSACryptoServiceProvider libraries favour byte arrays whereas the BC ones don’t.

Took me a while to figure out how to do the conversion.

The key is to use RSAParameters as the bridge between the two.

The code:

Gist.

Note that the signing can be handled completely within the .NET library whereas the encryption switches over to the BC library.

Enjoy!