add an integer length check for selection (#142)

add a sanity check when receiving big number as EC point

Co-authored-by: Ruiyu Zhu <[email protected]>

emp-tool/circuits/integer.hpp

@@ -160,6 +160,7 @@ inline Integer::Integer(T * input, int party) {
 
 
 inline Integer Integer::select(const Bit & select, const Integer & a) const{
+	assert(size() == a.size());
 	Integer res(*this);
 	for(size_t i = 0; i < size(); ++i)
 		res[i] = bits[i].select(select, a[i]);

emp-tool/io/io_channel.h

@@ -4,6 +4,7 @@
 #include "emp-tool/utils/prg.h"
 #include "emp-tool/utils/group.h"
 #include <memory>
+#include <cassert>  
 
 namespace emp {
 template<typename T> 
@@ -41,6 +42,7 @@ class IOChannel { public:
 		size_t len = 0;
 		for(int i = 0; i < num_pts; ++i) {
 			recv_data(&len, 4);
+			assert(len <= 2048);
 			g->resize_scratch(len);
 			unsigned char * tmp = g->scratch;
 			recv_data(tmp, len);
@@ -123,4 +125,4 @@ class IOChannel { public:
 	}
 };
 }
-#endif
+#endif