From 61caab8a8c8a4e4239216c861c4d1eba5bcfd76e Mon Sep 17 00:00:00 2001 From: moneromooo-monero Date: Wed, 4 Jul 2018 22:17:20 +0100 Subject: crypto: remove slight bias in key generation due to modulo --- tests/unit_tests/random.cpp | 47 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 47 insertions(+) create mode 100644 tests/unit_tests/random.cpp (limited to 'tests/unit_tests/random.cpp') diff --git a/tests/unit_tests/random.cpp b/tests/unit_tests/random.cpp new file mode 100644 index 000000000..7653453cd --- /dev/null +++ b/tests/unit_tests/random.cpp @@ -0,0 +1,47 @@ +// Copyright (c) 2018, The Monero Project +// +// All rights reserved. +// +// Redistribution and use in source and binary forms, with or without modification, are +// permitted provided that the following conditions are met: +// +// 1. Redistributions of source code must retain the above copyright notice, this list of +// conditions and the following disclaimer. +// +// 2. Redistributions in binary form must reproduce the above copyright notice, this list +// of conditions and the following disclaimer in the documentation and/or other +// materials provided with the distribution. +// +// 3. Neither the name of the copyright holder nor the names of its contributors may be +// used to endorse or promote products derived from this software without specific +// prior written permission. +// +// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY +// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF +// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL +// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, +// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, +// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS +// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, +// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF +// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + +#include "gtest/gtest.h" + +#include "crypto/crypto.h" + +extern "C" { +#include "crypto/crypto-ops.h" +} + +TEST(random32_unbiased, less_than_order) +{ + unsigned char tmp[32], tmp2[32]; + for (int i = 0; i < 1000; ++i) + { + crypto::random32_unbiased(tmp); + memcpy(tmp2, tmp, 32); + sc_reduce32(tmp2); + ASSERT_EQ(memcmp(tmp, tmp2, 32), 0); + } +} -- cgit v1.2.3