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// Copyright (c) 2012 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_BLOOM_H
#define BITCOIN_BLOOM_H
#include <vector>
#include "uint256.h"
#include "serialize.h"
class COutPoint;
class CTransaction;
// 20,000 items with fp rate < 0.1% or 10,000 items and <0.0001%
static const unsigned int MAX_BLOOM_FILTER_SIZE = 36000; // bytes
static const unsigned int MAX_HASH_FUNCS = 50;
/**
* BloomFilter is a probabilistic filter which SPV clients provide
* so that we can filter the transactions we sends them.
*
* This allows for significantly more efficient transaction and block downloads.
*
* Because bloom filters are probabilistic, an SPV node can increase the false-
* positive rate, making us send them transactions which aren't actually theirs,
* allowing clients to trade more bandwidth for more privacy by obfuscating which
* keys are owned by them.
*/
class CBloomFilter
{
private:
std::vector<unsigned char> vData;
unsigned int nHashFuncs;
unsigned int Hash(unsigned int nHashNum, const std::vector<unsigned char>& vDataToHash) const;
public:
// Creates a new bloom filter which will provide the given fp rate when filled with the given number of elements
// Note that if the given parameters will result in a filter outside the bounds of the protocol limits,
// the filter created will be as close to the given parameters as possible within the protocol limits.
// This will apply if nFPRate is very low or nElements is unreasonably high.
CBloomFilter(unsigned int nElements, double nFPRate);
// Using a filter initialized with this results in undefined behavior
// Should only be used for deserialization
CBloomFilter() {}
IMPLEMENT_SERIALIZE
(
READWRITE(vData);
READWRITE(nHashFuncs);
)
void insert(const std::vector<unsigned char>& vKey);
void insert(const COutPoint& outpoint);
void insert(const uint256& hash);
bool contains(const std::vector<unsigned char>& vKey) const;
bool contains(const COutPoint& outpoint) const;
bool contains(const uint256& hash) const;
// True if the size is <= MAX_BLOOM_FILTER_SIZE and the number of hash functions is <= MAX_HASH_FUNCS
// (catch a filter which was just deserialized which was too big)
bool IsWithinSizeConstraints() const;
bool IsTransactionRelevantToFilter(const CTransaction& tx) const;
};
#endif /* BITCOIN_BLOOM_H */
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