diff options
| -rw-r--r-- | src/addrman.cpp | 10 | ||||
| -rw-r--r-- | src/hash.h | 10 | ||||
| -rw-r--r-- | src/test/addrman_tests.cpp | 2 | ||||
| -rw-r--r-- | src/uint256.h | 11 | ||||
| -rw-r--r-- | src/validation.h | 6 |
5 files changed, 21 insertions, 18 deletions
diff --git a/src/addrman.cpp b/src/addrman.cpp index 093b263ab3..44328c3056 100644 --- a/src/addrman.cpp +++ b/src/addrman.cpp @@ -11,22 +11,22 @@ int CAddrInfo::GetTriedBucket(const uint256& nKey) const { - uint64_t hash1 = (CHashWriter(SER_GETHASH, 0) << nKey << GetKey()).GetHash().GetCheapHash(); - uint64_t hash2 = (CHashWriter(SER_GETHASH, 0) << nKey << GetGroup() << (hash1 % ADDRMAN_TRIED_BUCKETS_PER_GROUP)).GetHash().GetCheapHash(); + uint64_t hash1 = (CHashWriter(SER_GETHASH, 0) << nKey << GetKey()).GetCheapHash(); + uint64_t hash2 = (CHashWriter(SER_GETHASH, 0) << nKey << GetGroup() << (hash1 % ADDRMAN_TRIED_BUCKETS_PER_GROUP)).GetCheapHash(); return hash2 % ADDRMAN_TRIED_BUCKET_COUNT; } int CAddrInfo::GetNewBucket(const uint256& nKey, const CNetAddr& src) const { std::vector<unsigned char> vchSourceGroupKey = src.GetGroup(); - uint64_t hash1 = (CHashWriter(SER_GETHASH, 0) << nKey << GetGroup() << vchSourceGroupKey).GetHash().GetCheapHash(); - uint64_t hash2 = (CHashWriter(SER_GETHASH, 0) << nKey << vchSourceGroupKey << (hash1 % ADDRMAN_NEW_BUCKETS_PER_SOURCE_GROUP)).GetHash().GetCheapHash(); + uint64_t hash1 = (CHashWriter(SER_GETHASH, 0) << nKey << GetGroup() << vchSourceGroupKey).GetCheapHash(); + uint64_t hash2 = (CHashWriter(SER_GETHASH, 0) << nKey << vchSourceGroupKey << (hash1 % ADDRMAN_NEW_BUCKETS_PER_SOURCE_GROUP)).GetCheapHash(); return hash2 % ADDRMAN_NEW_BUCKET_COUNT; } int CAddrInfo::GetBucketPosition(const uint256 &nKey, bool fNew, int nBucket) const { - uint64_t hash1 = (CHashWriter(SER_GETHASH, 0) << nKey << (fNew ? 'N' : 'K') << nBucket << GetKey()).GetHash().GetCheapHash(); + uint64_t hash1 = (CHashWriter(SER_GETHASH, 0) << nKey << (fNew ? 'N' : 'K') << nBucket << GetKey()).GetCheapHash(); return hash1 % ADDRMAN_BUCKET_SIZE; } diff --git a/src/hash.h b/src/hash.h index 6acab0b161..c295568a3e 100644 --- a/src/hash.h +++ b/src/hash.h @@ -6,6 +6,7 @@ #ifndef BITCOIN_HASH_H #define BITCOIN_HASH_H +#include <crypto/common.h> #include <crypto/ripemd160.h> #include <crypto/sha256.h> #include <prevector.h> @@ -138,6 +139,15 @@ public: return result; } + /** + * Returns the first 64 bits from the resulting hash. + */ + inline uint64_t GetCheapHash() { + unsigned char result[CHash256::OUTPUT_SIZE]; + ctx.Finalize(result); + return ReadLE64(result); + } + template<typename T> CHashWriter& operator<<(const T& obj) { // Serialize to this stream diff --git a/src/test/addrman_tests.cpp b/src/test/addrman_tests.cpp index 8c2873d916..55fe19cebe 100644 --- a/src/test/addrman_tests.cpp +++ b/src/test/addrman_tests.cpp @@ -34,7 +34,7 @@ public: int RandomInt(int nMax) override { - state = (CHashWriter(SER_GETHASH, 0) << state).GetHash().GetCheapHash(); + state = (CHashWriter(SER_GETHASH, 0) << state).GetCheapHash(); return (unsigned int)(state % nMax); } diff --git a/src/uint256.h b/src/uint256.h index 26a3331d92..97e0cfa015 100644 --- a/src/uint256.h +++ b/src/uint256.h @@ -12,7 +12,6 @@ #include <stdint.h> #include <string> #include <vector> -#include <crypto/common.h> /** Template base class for fixed-sized opaque blobs. */ template<unsigned int BITS> @@ -123,16 +122,6 @@ class uint256 : public base_blob<256> { public: uint256() {} explicit uint256(const std::vector<unsigned char>& vch) : base_blob<256>(vch) {} - - /** A cheap hash function that just returns 64 bits from the result, it can be - * used when the contents are considered uniformly random. It is not appropriate - * when the value can easily be influenced from outside as e.g. a network adversary could - * provide values to trigger worst-case behavior. - */ - uint64_t GetCheapHash() const - { - return ReadLE64(data); - } }; /* uint256 from const char *. diff --git a/src/validation.h b/src/validation.h index 3e98ebc866..b5548a9293 100644 --- a/src/validation.h +++ b/src/validation.h @@ -12,6 +12,7 @@ #include <amount.h> #include <coins.h> +#include <crypto/common.h> // for ReadLE64 #include <fs.h> #include <protocol.h> // For CMessageHeader::MessageStartChars #include <policy/feerate.h> @@ -138,7 +139,10 @@ static const int DEFAULT_STOPATHEIGHT = 0; struct BlockHasher { - size_t operator()(const uint256& hash) const { return hash.GetCheapHash(); } + // this used to call `GetCheapHash()` in uint256, which was later moved; the + // cheap hash function simply calls ReadLE64() however, so the end result is + // identical + size_t operator()(const uint256& hash) const { return ReadLE64(hash.begin()); } }; extern CScript COINBASE_FLAGS; |