add guard for test case size

Author: wangxiao1254

test/bench_lpn.cpp

@@ -15,6 +15,11 @@ int main(int argc, char** argv) {
 		k = 11;
 		n = 20;
 	}
+	if(n > 30 or k > 30) {
+		cout <<"Large test size! comment me if you want to run this size\n";
+		exit(1);
+	}
+
 	block seed;
 	block * kk = new block[1<<k];
 	block * nn = new block[1<<n];

test/ferret.cpp

@@ -33,6 +33,11 @@ int main(int argc, char** argv) {
 	int64_t length = 24;
 	if (argc > 3)
 		length = atoi(argv[3]);
+	if(length > 30) {
+		cout <<"Large test size! comment me if you want to run this size\n";
+		exit(1);
+	}
+		
 	test_ferret(party, ios, length);
 
 	for(int i = 0; i < threads; ++i)