63 lines
1.4 KiB
Go
63 lines
1.4 KiB
Go
package randomx
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import (
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"crypto/subtle"
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"git.gammaspectra.live/P2Pool/consensus/v3/monero/crypto"
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"git.gammaspectra.live/P2Pool/consensus/v3/types"
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)
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type Hasher interface {
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Hash(key []byte, input []byte) (types.Hash, error)
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OptionFlags(flags ...Flag) error
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OptionNumberOfCachedStates(n int) error
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Close()
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}
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func SeedHeights(height uint64) (seedHeight, nextHeight uint64) {
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return SeedHeight(height), SeedHeight(height + SeedHashEpochLag)
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}
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func SeedHeight(height uint64) uint64 {
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if height <= SeedHashEpochBlocks+SeedHashEpochLag {
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return 0
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}
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return (height - SeedHashEpochLag - 1) & (^uint64(SeedHashEpochBlocks - 1))
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}
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type Flag int
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const (
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FlagLargePages Flag = 1 << iota
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FlagFullMemory
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FlagSecure
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)
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const (
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SeedHashEpochLag = 64
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SeedHashEpochBlocks = 2048
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)
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func consensusHash(scratchpad []byte) types.Hash {
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// Intentionally not a power of 2
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const ScratchpadSize = 1009
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const RandomxArgonMemory = 262144
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n := RandomxArgonMemory * 1024
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const Vec128Size = 128 / 8
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cachePtr := scratchpad[ScratchpadSize*Vec128Size:]
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scratchpadTopPtr := scratchpad[:ScratchpadSize*Vec128Size]
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for i := ScratchpadSize * Vec128Size; i < n; i += ScratchpadSize * Vec128Size {
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stride := ScratchpadSize * Vec128Size
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if stride > len(cachePtr) {
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stride = len(cachePtr)
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}
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subtle.XORBytes(scratchpadTopPtr, scratchpadTopPtr, cachePtr[:stride])
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cachePtr = cachePtr[stride:]
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}
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return crypto.Keccak256(scratchpadTopPtr)
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}
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