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ubqhash/algorithm: add blakeHasher (Sum based makeHasher) as blake2b has no Read func

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This commit is contained in:
Luke Williams 2019-05-20 13:57:06 +02:00
parent fd3a68bd34
commit 354a3344c1
1 changed files with 15 additions and 1 deletions
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16
consensus/ubqhash/algorithm.go
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@ -120,6 +120,20 @@ func makeHasher(h hash.Hash) hasher {
} }
} }
// blakeHasher creates a repetitive hasher, allowing the same hash data structures
// to be reused between hash runs instead of requiring new ones to be created.
// The returned function is not thread safe!
// based on previous Sum based makeHasher as blake2b lacks a Read function - iquidus
func blakeHasher(h hash.Hash) hasher {
return func(dest []byte, data []byte) {
h.Write(data)
h.Sum(dest[:0])
h.Reset()
}
}
// seedHash is the seed to use for generating a verification cache and the mining // seedHash is the seed to use for generating a verification cache and the mining
// dataset. // dataset.
func seedHash(block uint64) []byte { func seedHash(block uint64) []byte {
@ -184,7 +198,7 @@ func generateCache(dest []uint32, epoch uint64, seed []byte) {
keccak512 := makeHasher(sha3.NewLegacyKeccak512()) keccak512 := makeHasher(sha3.NewLegacyKeccak512())
if epoch >= uip1Epoch { if epoch >= uip1Epoch {
h, _ := blake2b.New512(nil) h, _ := blake2b.New512(nil)
keccak512 = makeHasher(h) keccak512 = blakeHasher(h) // use blakeHasher instead of makeHasher here.
} }
// Sequentially produce the initial dataset // Sequentially produce the initial dataset