Handle non valid input, remove debug

c_src/ecrecover.c

@@ -42,9 +42,8 @@ recover(ErlNifEnv* env, int argc, const ERL_NIF_TERM argv[])
     if (recid < 0 || recid > 3) {
 		error_result(env, "Recovery id invalid 0-3x");
 	}
-printf("xx1\r\n");
+
     result = secp256k1_ecdsa_recoverable_signature_parse_compact(ctx, &signature, csignature.data, recid);
-printf("xx2\r\n");
 	if (!result) {
 		return error_result(env, "ecdsa_signature_parse_compact returned 0");
 	}
@@ -56,12 +55,9 @@ printf("xx2\r\n");
 	    return error_result(env, "ecdsa recovery problem");
 	}
 
-	// Now serialize recpubkey based on the compression flag
+	// Now serialize recpubkey
 	finished_recpubkey_buf = enif_make_new_binary(env, pubkeylen, &r);
 
-    printf("pubker[0] = %d\r\n", recpubkey.data[0]);
-
-
 	result = secp256k1_ec_pubkey_serialize(ctx, finished_recpubkey_buf,
 			&pubkeylen, &recpubkey, compressed);
 

src/ecrecover.erl

@@ -37,7 +37,9 @@ recover(Hash, <<V, Sig:64/binary>>) when V == 27; V == 28 ->
             <<0:96, ShortPub/binary>>;
         {error, _} ->
             <<0:256>>
-        end.
+        end;
+recover(_Hash, _VSig) ->
+    <<0:256>>.
 
 -spec recover(<<_:(32*8)>>, <<_:(65*8)>>, integer()) -> <<_:(32*8)>>.
 recover(_Hash, _Sig, _RecId) ->