diff options
| -rw-r--r-- | src/random.cpp | 20 | ||||
| -rw-r--r-- | src/random.h | 6 | ||||
| -rw-r--r-- | src/test/random_tests.cpp | 7 |
3 files changed, 33 insertions, 0 deletions
diff --git a/src/random.cpp b/src/random.cpp index de7553c825..e1ccfa5f24 100644 --- a/src/random.cpp +++ b/src/random.cpp @@ -304,6 +304,26 @@ void FastRandomContext::RandomSeed() requires_seed = false; } +uint256 FastRandomContext::rand256() +{ + if (bytebuf_size < 32) { + FillByteBuffer(); + } + uint256 ret; + memcpy(ret.begin(), bytebuf + 64 - bytebuf_size, 32); + bytebuf_size -= 32; + return ret; +} + +std::vector<unsigned char> FastRandomContext::randbytes(size_t len) +{ + std::vector<unsigned char> ret(len); + if (len > 0) { + rng.Output(&ret[0], len); + } + return ret; +} + FastRandomContext::FastRandomContext(const uint256& seed) : requires_seed(false), bytebuf_size(0), bitbuf_size(0) { rng.SetKey(seed.begin(), 32); diff --git a/src/random.h b/src/random.h index 6a63d57429..dcb74eadb5 100644 --- a/src/random.h +++ b/src/random.h @@ -110,9 +110,15 @@ public: } } + /** Generate random bytes. */ + std::vector<unsigned char> randbytes(size_t len); + /** Generate a random 32-bit integer. */ uint32_t rand32() { return randbits(32); } + /** generate a random uint256. */ + uint256 rand256(); + /** Generate a random boolean. */ bool randbool() { return randbits(1); } }; diff --git a/src/test/random_tests.cpp b/src/test/random_tests.cpp index 8596734226..132e190051 100644 --- a/src/test/random_tests.cpp +++ b/src/test/random_tests.cpp @@ -25,14 +25,21 @@ BOOST_AUTO_TEST_CASE(fastrandom_tests) BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32()); BOOST_CHECK_EQUAL(ctx1.rand64(), ctx2.rand64()); BOOST_CHECK_EQUAL(ctx1.randbits(3), ctx2.randbits(3)); + BOOST_CHECK(ctx1.randbytes(17) == ctx2.randbytes(17)); + BOOST_CHECK(ctx1.rand256() == ctx2.rand256()); BOOST_CHECK_EQUAL(ctx1.randbits(7), ctx2.randbits(7)); + BOOST_CHECK(ctx1.randbytes(128) == ctx2.randbytes(128)); BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32()); BOOST_CHECK_EQUAL(ctx1.randbits(3), ctx2.randbits(3)); + BOOST_CHECK(ctx1.rand256() == ctx2.rand256()); + BOOST_CHECK(ctx1.randbytes(50) == ctx2.randbytes(50)); // Check that a nondeterministic ones are not FastRandomContext ctx3; FastRandomContext ctx4; BOOST_CHECK(ctx3.rand64() != ctx4.rand64()); // extremely unlikely to be equal + BOOST_CHECK(ctx3.rand256() != ctx4.rand256()); + BOOST_CHECK(ctx3.randbytes(7) != ctx4.randbytes(7)); } BOOST_AUTO_TEST_CASE(fastrandom_randbits) |