Fix up RSA integration

openssl/src/bn/mod.rs

@@ -108,7 +108,7 @@ impl BigNum {
         }
         let r = ffi::BN_dup(orig);
         if r.is_null() {
-            panic!("Unexpected null pointer from BN_dup(..)")
+            Err(SslError::get())
         } else {
             Ok(BigNum(r))
         }

openssl/src/crypto/rsa.rs

@@ -41,6 +41,6 @@ impl RSA {
 
 impl fmt::Debug for RSA {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        write!(f, "Currently no debug output. Sorry :(")
+        write!(f, "RSA")
     }
 }