Merge #10321: Use FastRandomContext for all tests

e94584858 scripted-diff: Use new naming style for insecure_rand* functions (Pieter Wuille)
2fcd9cc86 scripted-diff: Use randbits/bool instead of randrange where possible (Pieter Wuille)
2ada67852 Use randbits instead of ad-hoc emulation in prevector tests (Pieter Wuille)
5f0b04eed Replace rand() & ((1 << N) - 1) with randbits(N) (Pieter Wuille)
3ecabae36 Replace more rand() % NUM by randranges (Pieter Wuille)
efee1db21 scripted-diff: use insecure_rand256/randrange more (Pieter Wuille)
1119927df Add various insecure_rand wrappers for tests (Pieter Wuille)
124d13a58 Merge test_random.h into test_bitcoin.h (Pieter Wuille)
90620d66c scripted-diff: Rename cuckoo tests' local rand context (Pieter Wuille)
37e864eb9 Add FastRandomContext::rand256() and ::randbytes() (Pieter Wuille)

Tree-SHA512: d09705a3ec718ae792f7d66a75401903ba7b9c9d3fc36669d6e3b9242f0194738106be26baefc8a8e3fa6df7c9a35978c71c0c430278a028b331df23a3ea3070

1 files changed, 20 insertions, 0 deletions

diff --git a/src/random.cpp b/src/random.cpp
index de7553c82..e1ccfa5f2 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);