I\'m busy trying to port Java code that looks like this
Cipher rsa = Cipher.getInstance(\"RSA/ECB/nopadding\"); rsa.init(Cipher.DECRYPT_MODE, RSA
You might want to get the code from BouncyCastle, http://www.bouncycastle.org/csharp/, and modify the code from the link below, and ensure that it can use the encryption that you list above.
http://www.java2s.com/Code/Java/Security/Whatisinbouncycastlebouncycastle.htm