Refactor BigInt

1 files changed, 74 insertions, 0 deletions

diff --git a/src/tests/catchy/test_bigint.cpp b/src/tests/catchy/test_bigint.cpp
new file mode 100644
index 000000000..5f4c960cf
--- /dev/null
+++ b/src/tests/catchy/test_bigint.cpp
@@ -0,0 +1,74 @@
+// (C) 2015 Simon Warta (Kullo GmbH)
+// Botan is released under the Simplified BSD License (see license.txt)
+
+#include "catch.hpp"
+
+#include <botan/build.h>
+
+#if defined(BOTAN_HAS_BIGINT)
+
+#include <botan/bigint.h>
+
+using namespace Botan;
+
+TEST_CASE("Bigint basics", "[bigint]")
+   {
+   SECTION("in 0-bit border")
+      {
+      BigInt a(0u);
+      CHECK(( a.bits() == 0 ));
+      CHECK(( a.bytes() == 0 ));
+      CHECK(( a.to_u32bit() == 0 ));
+      }
+   SECTION("above 0-bit border")
+      {
+      BigInt a(1u);
+      CHECK(( a.bits() == 1 ));
+      CHECK(( a.bytes() == 1 ));
+      CHECK(( a.to_u32bit() == 1 ));
+      }
+   SECTION("in 8-bit border")
+      {
+      BigInt a(255u);
+      CHECK(( a.bits() == 8 ));
+      CHECK(( a.bytes() == 1 ));
+      CHECK(( a.to_u32bit() == 255 ));
+      }
+   SECTION("above 8-bit border")
+      {
+      BigInt a(256u);
+      CHECK(( a.bits() == 9 ));
+      CHECK(( a.bytes() == 2 ));
+      CHECK(( a.to_u32bit() == 256 ));
+      }
+   SECTION("in 16-bit border")
+      {
+      BigInt a(65535u);
+      CHECK(( a.bits() == 16 ));
+      CHECK(( a.bytes() == 2 ));
+      CHECK(( a.to_u32bit() == 65535 ));
+      }
+   SECTION("above 16-bit border")
+      {
+      BigInt a(65536u);
+      CHECK(( a.bits() == 17 ));
+      CHECK(( a.bytes() == 3 ));
+      CHECK(( a.to_u32bit() == 65536 ));
+      }
+   SECTION("in 32-bit border")
+      {
+      BigInt a(4294967295u);
+      CHECK(( a.bits() == 32 ));
+      CHECK(( a.bytes() == 4 ));
+      CHECK(( a.to_u32bit() == 4294967295u ));
+      }
+   SECTION("above 32-bit border")
+      {
+      BigInt a(4294967296u);
+      CHECK(( a.bits() == 33 ));
+      CHECK(( a.bytes() == 5 ));
+      CHECK_THROWS( a.to_u32bit() );
+      }
+   }
+
+#endif