119 lines
4.9 KiB
Go
119 lines
4.9 KiB
Go
package sidechain
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import (
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"encoding/binary"
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"git.gammaspectra.live/P2Pool/edwards25519"
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"git.gammaspectra.live/P2Pool/p2pool-observer/monero/address"
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"git.gammaspectra.live/P2Pool/p2pool-observer/monero/crypto"
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"git.gammaspectra.live/P2Pool/p2pool-observer/types"
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"git.gammaspectra.live/P2Pool/p2pool-observer/utils"
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"git.gammaspectra.live/P2Pool/sha3"
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)
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type deterministicTransactionCacheKey [crypto.PublicKeySize + types.HashSize]byte
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type ephemeralPublicKeyCacheKey [crypto.PrivateKeySize + crypto.PublicKeySize*2 + 8]byte
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type derivationCacheKey [crypto.PrivateKeySize + crypto.PublicKeySize]byte
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type ephemeralPublicKeyWithViewTag struct {
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PublicKey crypto.PublicKeyBytes
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ViewTag uint8
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}
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type DerivationCacheInterface interface {
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GetEphemeralPublicKey(a *address.PackedAddress, txKeySlice crypto.PrivateKeySlice, txKeyScalar *crypto.PrivateKeyScalar, outputIndex uint64, hasher *sha3.HasherState) (crypto.PublicKeyBytes, uint8)
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GetDeterministicTransactionKey(seed types.Hash, prevId types.Hash) *crypto.KeyPair
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}
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type DerivationCache struct {
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deterministicKeyCache utils.Cache[deterministicTransactionCacheKey, *crypto.KeyPair]
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derivationCache utils.Cache[derivationCacheKey, crypto.PublicKeyBytes]
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ephemeralPublicKeyCache utils.Cache[ephemeralPublicKeyCacheKey, ephemeralPublicKeyWithViewTag]
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pubKeyToPointCache utils.Cache[crypto.PublicKeyBytes, *edwards25519.Point]
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}
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func NewDerivationLRUCache() *DerivationCache {
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d := &DerivationCache{
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deterministicKeyCache: utils.NewLRUCache[deterministicTransactionCacheKey, *crypto.KeyPair](32),
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ephemeralPublicKeyCache: utils.NewLRUCache[ephemeralPublicKeyCacheKey, ephemeralPublicKeyWithViewTag](2000),
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derivationCache: utils.NewLRUCache[derivationCacheKey, crypto.PublicKeyBytes](2000),
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pubKeyToPointCache: utils.NewLRUCache[crypto.PublicKeyBytes, *edwards25519.Point](2000),
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}
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return d
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}
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func NewDerivationMapCache() *DerivationCache {
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d := &DerivationCache{
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deterministicKeyCache: utils.NewMapCache[deterministicTransactionCacheKey, *crypto.KeyPair](32),
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ephemeralPublicKeyCache: utils.NewMapCache[ephemeralPublicKeyCacheKey, ephemeralPublicKeyWithViewTag](2000),
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derivationCache: utils.NewMapCache[derivationCacheKey, crypto.PublicKeyBytes](2000),
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pubKeyToPointCache: utils.NewMapCache[crypto.PublicKeyBytes, *edwards25519.Point](2000),
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}
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return d
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}
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func (d *DerivationCache) Clear() {
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d.deterministicKeyCache.Clear()
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d.ephemeralPublicKeyCache.Clear()
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d.derivationCache.Clear()
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d.pubKeyToPointCache.Clear()
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}
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func (d *DerivationCache) GetEphemeralPublicKey(a *address.PackedAddress, txKeySlice crypto.PrivateKeySlice, txKeyScalar *crypto.PrivateKeyScalar, outputIndex uint64, hasher *sha3.HasherState) (crypto.PublicKeyBytes, uint8) {
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var key ephemeralPublicKeyCacheKey
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copy(key[:], txKeySlice)
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copy(key[crypto.PrivateKeySize:], a.ToPackedAddress().Bytes())
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binary.LittleEndian.PutUint64(key[crypto.PrivateKeySize+crypto.PublicKeySize*2:], outputIndex)
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if ephemeralPubKey, ok := d.ephemeralPublicKeyCache.Get(key); ok {
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return ephemeralPubKey.PublicKey, ephemeralPubKey.ViewTag
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} else {
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viewPoint := d.getPublicKeyPoint(*a.ViewPublicKey())
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spendPoint := d.getPublicKeyPoint(*a.SpendPublicKey())
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derivation := d.getDerivation(*a.ViewPublicKey(), txKeySlice, viewPoint, txKeyScalar.Scalar())
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pKB, viewTag := address.GetEphemeralPublicKeyAndViewTagNoAllocate(spendPoint, derivation, txKeyScalar.Scalar(), outputIndex, hasher)
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d.ephemeralPublicKeyCache.Set(key, ephemeralPublicKeyWithViewTag{PublicKey: pKB, ViewTag: viewTag})
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return pKB, viewTag
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}
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}
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func (d *DerivationCache) GetDeterministicTransactionKey(seed types.Hash, prevId types.Hash) *crypto.KeyPair {
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var key deterministicTransactionCacheKey
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copy(key[:], seed[:])
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copy(key[types.HashSize:], prevId[:])
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if kp, ok := d.deterministicKeyCache.Get(key); ok {
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return kp
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} else {
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priv := address.GetDeterministicTransactionPrivateKey(seed, prevId).AsBytes()
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pub := priv.PublicKey().AsBytes()
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privBytes := priv.AsBytes()
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kp = &crypto.KeyPair{PrivateKey: &privBytes, PublicKey: &pub}
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d.deterministicKeyCache.Set(key, kp)
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return kp
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}
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}
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func (d *DerivationCache) getDerivation(viewPublicKeyBytes crypto.PublicKeyBytes, txKeySlice crypto.PrivateKeySlice, viewPublicKeyPoint *edwards25519.Point, txKey *edwards25519.Scalar) crypto.PublicKeyBytes {
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var key derivationCacheKey
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copy(key[:], viewPublicKeyBytes[:])
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copy(key[crypto.PublicKeySize:], txKeySlice[:])
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if derivation, ok := d.derivationCache.Get(key); ok {
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return derivation
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} else {
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derivation = address.GetDerivationNoAllocate(viewPublicKeyPoint, txKey)
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d.derivationCache.Set(key, derivation)
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return derivation
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}
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}
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func (d *DerivationCache) getPublicKeyPoint(publicKey crypto.PublicKeyBytes) *edwards25519.Point {
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if point, ok := d.pubKeyToPointCache.Get(publicKey); ok {
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return point
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} else {
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point = publicKey.AsPoint().Point()
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d.pubKeyToPointCache.Set(publicKey, point)
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return point
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}
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}
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