各位大侠下列这段JAVA代码如何用C#实现呢

public  static SecretKey getKey(String key){

       SecretKey deskey = null;

       try { 

KeyGenerator gen = KeyGenerator.getInstance(Algorithm);

SecureRandom secureRandom = SecureRandom.getInstance("SHA1PRNG");

           secureRandom.setSeed(key.getBytes());

           gen.init(112, secureRandom);

           deskey =  gen.generateKey();

           gen = null;

           return deskey;

       } catch (NoSuchAlgorithmException e) {

           // TODO Auto-generated catch block

           e.printStackTrace();

       }

       return deskey;

    }