1 files changed, 29 insertions, 0 deletions
diff --git a/src/fuzzer/divide.cpp b/src/fuzzer/divide.cpp
new file mode 100644
index 000000000..01ec14e28
--- /dev/null
+++ b/src/fuzzer/divide.cpp
@@ -0,0 +1,29 @@
+/*
+* (C) 2015,2016 Jack Lloyd
+*
+* Botan is released under the Simplified BSD License (see license.txt)
+*/
+#include "fuzzers.h"
+#include <botan/divide.h>
+
+void fuzz(const uint8_t in[], size_t len)
+   {
+   if(len % 2 == 1 || len > 2*4096/8)
+      return;
+
+   const Botan::BigInt x = Botan::BigInt::decode(in, len / 2);
+   const Botan::BigInt y = Botan::BigInt::decode(in + len / 2, len / 2);
+
+   if(y == 0)
+      return;
+
+   Botan::BigInt q, r;
+   Botan::divide(x, y, q, r);
+
+   FUZZER_ASSERT_TRUE(r < y);
+
+   Botan::BigInt z = q*y + r;
+
+   FUZZER_ASSERT_EQUAL(z, x);
+   }
+