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Switch FastRandomContext to ChaCha20

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This commit is contained in:
Pieter Wuille 2017-02-15 17:45:22 -08:00
parent e04326fe66
commit 16329224e7
10 changed files with 126 additions and 43 deletions
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2
src/Makefile.test.include
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@ -57,8 +57,8 @@ BITCOIN_TESTS =\
test/policyestimator_tests.cpp \
test/pow_tests.cpp \
test/prevector_tests.cpp \
test/random_tests.cpp \
test/raii_event_tests.cpp \
test/random_tests.cpp \
test/reverselock_tests.cpp \
test/rpc_tests.cpp \
test/sanity_tests.cpp \

8
src/addrman.cpp
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@ -351,8 +351,8 @@ CAddrInfo CAddrMan::Select_(bool newOnly)
int nKBucket = RandomInt(ADDRMAN_TRIED_BUCKET_COUNT);
int nKBucketPos = RandomInt(ADDRMAN_BUCKET_SIZE);
while (vvTried[nKBucket][nKBucketPos] == -1) {
nKBucket = (nKBucket + insecure_rand.rand32()) % ADDRMAN_TRIED_BUCKET_COUNT;
nKBucketPos = (nKBucketPos + insecure_rand.rand32()) % ADDRMAN_BUCKET_SIZE;
nKBucket = (nKBucket + insecure_rand.randbits(ADDRMAN_TRIED_BUCKET_COUNT_LOG2)) % ADDRMAN_TRIED_BUCKET_COUNT;
nKBucketPos = (nKBucketPos + insecure_rand.randbits(ADDRMAN_BUCKET_SIZE_LOG2)) % ADDRMAN_BUCKET_SIZE;
}
int nId = vvTried[nKBucket][nKBucketPos];
assert(mapInfo.count(nId) == 1);
@ -368,8 +368,8 @@ CAddrInfo CAddrMan::Select_(bool newOnly)
int nUBucket = RandomInt(ADDRMAN_NEW_BUCKET_COUNT);
int nUBucketPos = RandomInt(ADDRMAN_BUCKET_SIZE);
while (vvNew[nUBucket][nUBucketPos] == -1) {
nUBucket = (nUBucket + insecure_rand.rand32()) % ADDRMAN_NEW_BUCKET_COUNT;
nUBucketPos = (nUBucketPos + insecure_rand.rand32()) % ADDRMAN_BUCKET_SIZE;
nUBucket = (nUBucket + insecure_rand.randbits(ADDRMAN_NEW_BUCKET_COUNT_LOG2)) % ADDRMAN_NEW_BUCKET_COUNT;
nUBucketPos = (nUBucketPos + insecure_rand.randbits(ADDRMAN_BUCKET_SIZE_LOG2)) % ADDRMAN_BUCKET_SIZE;
}
int nId = vvNew[nUBucket][nUBucketPos];
assert(mapInfo.count(nId) == 1);

11
src/addrman.h
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@ -136,13 +136,13 @@ public:
*/
//! total number of buckets for tried addresses
#define ADDRMAN_TRIED_BUCKET_COUNT 256
#define ADDRMAN_TRIED_BUCKET_COUNT_LOG2 8
//! total number of buckets for new addresses
#define ADDRMAN_NEW_BUCKET_COUNT 1024
#define ADDRMAN_NEW_BUCKET_COUNT_LOG2 10
//! maximum allowed number of entries in buckets for new and tried addresses
#define ADDRMAN_BUCKET_SIZE 64
#define ADDRMAN_BUCKET_SIZE_LOG2 6
//! over how many buckets entries with tried addresses from a single group (/16 for IPv4) are spread
#define ADDRMAN_TRIED_BUCKETS_PER_GROUP 8
@ -171,6 +171,11 @@ public:
//! the maximum number of nodes to return in a getaddr call
#define ADDRMAN_GETADDR_MAX 2500
//! Convenience
#define ADDRMAN_TRIED_BUCKET_COUNT (1 << ADDRMAN_TRIED_BUCKET_COUNT_LOG2)
#define ADDRMAN_NEW_BUCKET_COUNT (1 << ADDRMAN_NEW_BUCKET_COUNT_LOG2)
#define ADDRMAN_BUCKET_SIZE (1 << ADDRMAN_BUCKET_SIZE_LOG2)
/**
* Stochastical (IP) address manager
*/

33
src/random.cpp
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@ -240,22 +240,16 @@ uint256 GetRandHash()
return hash;
}
FastRandomContext::FastRandomContext(bool fDeterministic)
void FastRandomContext::RandomSeed()
{
// The seed values have some unlikely fixed points which we avoid.
if (fDeterministic) {
Rz = Rw = 11;
} else {
uint32_t tmp;
do {
GetRandBytes((unsigned char*)&tmp, 4);
} while (tmp == 0 || tmp == 0x9068ffffU);
Rz = tmp;
do {
GetRandBytes((unsigned char*)&tmp, 4);
} while (tmp == 0 || tmp == 0x464fffffU);
Rw = tmp;
}
uint256 seed = GetRandHash();
rng.SetKey(seed.begin(), 32);
requires_seed = false;
}
FastRandomContext::FastRandomContext(const uint256& seed) : requires_seed(false), bytebuf_size(0), bitbuf_size(0)
{
rng.SetKey(seed.begin(), 32);
}
bool Random_SanityCheck()
@ -288,3 +282,12 @@ bool Random_SanityCheck()
} while (num_overwritten < NUM_OS_RANDOM_BYTES && tries < MAX_TRIES);
return (num_overwritten == NUM_OS_RANDOM_BYTES); /* If this failed, bailed out after too many tries */
}
FastRandomContext::FastRandomContext(bool fDeterministic) : requires_seed(!fDeterministic), bytebuf_size(0), bitbuf_size(0)
{
if (!fDeterministic) {
return;
}
uint256 seed;
rng.SetKey(seed.begin(), 32);
}

66
src/random.h
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@ -6,6 +6,7 @@
#ifndef BITCOIN_RANDOM_H
#define BITCOIN_RANDOM_H
#include "crypto/chacha20.h"
#include "uint256.h"
#include <stdint.h>
@ -33,21 +34,68 @@ void GetStrongRandBytes(unsigned char* buf, int num);
* This class is not thread-safe.
*/
class FastRandomContext {
private:
bool requires_seed;
ChaCha20 rng;
unsigned char bytebuf[64];
int bytebuf_size;
uint64_t bitbuf;
int bitbuf_size;
void RandomSeed();
void FillByteBuffer()
{
if (requires_seed) {
RandomSeed();
}
rng.Output(bytebuf, sizeof(bytebuf));
bytebuf_size = sizeof(bytebuf);
}
void FillBitBuffer()
{
bitbuf = rand64();
bitbuf_size = 64;
}
public:
explicit FastRandomContext(bool fDeterministic=false);
explicit FastRandomContext(bool fDeterministic = false);
uint32_t rand32() {
Rz = 36969 * (Rz & 65535) + (Rz >> 16);
Rw = 18000 * (Rw & 65535) + (Rw >> 16);
return (Rw << 16) + Rz;
/** Initialize with explicit seed (only for testing) */
explicit FastRandomContext(const uint256& seed);
/** Generate a random 64-bit integer. */
uint64_t rand64()
{
if (bytebuf_size < 8) FillByteBuffer();
uint64_t ret = ReadLE64(bytebuf + 64 - bytebuf_size);
bytebuf_size -= 8;
return ret;
}
bool randbool() {
return rand32() & 1;
/** Generate a random (bits)-bit integer. */
uint64_t randbits(int bits) {
if (bits == 0) {
return 0;
} else if (bits > 32) {
return rand64() >> (64 - bits);
} else {
if (bitbuf_size < bits) FillBitBuffer();
uint64_t ret = bitbuf & (~(uint64_t)0 >> (64 - bits));
bitbuf >>= bits;
bitbuf_size -= bits;
return ret;
}
}
uint32_t Rz;
uint32_t Rw;
/** Generate a random 32-bit integer. */
uint32_t rand32() { return randbits(32); }
/** Generate a random boolean. */
bool randbool() { return randbits(1); }
};
/* Number of random bytes returned by GetOSRand.

9
src/test/addrman_tests.cpp
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@ -203,10 +203,11 @@ BOOST_AUTO_TEST_CASE(addrman_select)
BOOST_CHECK(addrman.size() == 7);
// Test 12: Select pulls from new and tried regardless of port number.
BOOST_CHECK(addrman.Select().ToString() == "250.4.6.6:8333");
BOOST_CHECK(addrman.Select().ToString() == "250.3.2.2:9999");
BOOST_CHECK(addrman.Select().ToString() == "250.3.3.3:9999");
BOOST_CHECK(addrman.Select().ToString() == "250.4.4.4:8333");
std::set<uint16_t> ports;
for (int i = 0; i < 20; ++i) {
ports.insert(addrman.Select().GetPort());
}
BOOST_CHECK_EQUAL(ports.size(), 3);
}
BOOST_AUTO_TEST_CASE(addrman_new_collisions)

8
src/test/prevector_tests.cpp
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@ -28,6 +28,7 @@ class prevector_tester {
typedef typename pretype::size_type Size;
bool passed = true;
FastRandomContext rand_cache;
uint256 rand_seed;
template <typename A, typename B>
@ -183,13 +184,12 @@ public:
}
~prevector_tester() {
BOOST_CHECK_MESSAGE(passed, "insecure_rand_Rz: "
<< rand_cache.Rz
<< ", insecure_rand_Rw: "
<< rand_cache.Rw);
BOOST_CHECK_MESSAGE(passed, "insecure_rand: " + rand_seed.ToString());
}
prevector_tester() {
seed_insecure_rand();
rand_seed = insecure_rand_seed;
rand_cache = insecure_rand_ctx;
}
};

21
src/test/random_tests.cpp
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@ -15,5 +15,24 @@ BOOST_AUTO_TEST_CASE(osrandom_tests)
BOOST_CHECK(Random_SanityCheck());
}
BOOST_AUTO_TEST_SUITE_END()
BOOST_AUTO_TEST_CASE(fastrandom_tests)
{
// Check that deterministic FastRandomContexts are deterministic
FastRandomContext ctx1(true);
FastRandomContext ctx2(true);
BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32());
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_EQUAL(ctx1.randbits(7), ctx2.randbits(7));
BOOST_CHECK_EQUAL(ctx1.rand32(), ctx2.rand32());
BOOST_CHECK_EQUAL(ctx1.randbits(3), ctx2.randbits(3));
// Check that a nondeterministic ones are not
FastRandomContext ctx3;
FastRandomContext ctx4;
BOOST_CHECK(ctx3.rand64() != ctx4.rand64()); // extremely unlikely to be equal
}
BOOST_AUTO_TEST_SUITE_END()

3
src/test/test_bitcoin.cpp
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@ -27,7 +27,8 @@
#include <boost/filesystem.hpp>
#include <boost/thread.hpp>
FastRandomContext insecure_rand_ctx(true);
uint256 insecure_rand_seed = GetRandHash();
FastRandomContext insecure_rand_ctx(insecure_rand_seed);
extern bool fPrintToConsole;
extern void noui_connect();

8
src/test/test_random.h
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@ -8,11 +8,17 @@
#include "random.h"
extern uint256 insecure_rand_seed;
extern FastRandomContext insecure_rand_ctx;
static inline void seed_insecure_rand(bool fDeterministic = false)
{
insecure_rand_ctx = FastRandomContext(fDeterministic);
if (fDeterministic) {
insecure_rand_seed = uint256();
} else {
insecure_rand_seed = GetRandHash();
}
insecure_rand_ctx = FastRandomContext(insecure_rand_seed);
}
static inline uint32_t insecure_rand(void)