fixed xor with zero

1 files changed, 6 insertions, 0 deletions

diff --git a/src/bigint.cpp b/src/bigint.cpp
index a68dd3a4b8..05c6463aa3 100644
--- a/src/bigint.cpp
+++ b/src/bigint.cpp
@@ -1271,6 +1271,12 @@ void bigint_and(BigInt *dest, const BigInt *op1, const BigInt *op2) {
 }
 
 void bigint_xor(BigInt *dest, const BigInt *op1, const BigInt *op2) {
+    if (op1->digit_count == 0) {
+        return bigint_init_bigint(dest, op2);
+    }
+    if (op2->digit_count == 0) {
+        return bigint_init_bigint(dest, op1);
+    }
     if (op1->is_negative || op2->is_negative) {
         // TODO this code path is untested
         size_t big_bit_count = max(bigint_bits_needed(op1), bigint_bits_needed(op2));