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e3463b7268
* Replace keccak with CSHAKE256 in oPoW * Add benchmarks to hash writers to compare blake2b to the CSHAKE * Update genesis blocks * Update tests * Define genesis's block level to be the maximal one * Add message to genesis coinbase * Add comments to genesis coinbase * Fix tests Co-authored-by: Ori Newman <orinewman1@gmail.com>
88 lines
3.3 KiB
Go
88 lines
3.3 KiB
Go
package pow
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import (
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"github.com/kaspanet/kaspad/domain/consensus/model/externalapi"
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"github.com/kaspanet/kaspad/domain/consensus/utils/consensushashing"
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"github.com/kaspanet/kaspad/domain/consensus/utils/constants"
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"github.com/kaspanet/kaspad/domain/consensus/utils/hashes"
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"github.com/kaspanet/kaspad/domain/consensus/utils/serialization"
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"github.com/kaspanet/kaspad/util/difficulty"
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"github.com/pkg/errors"
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"math/big"
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)
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// CheckProofOfWorkWithTarget check's if the block has a valid PoW according to the provided target
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// it does not check if the difficulty itself is valid or less than the maximum for the appropriate network
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func CheckProofOfWorkWithTarget(header externalapi.MutableBlockHeader, target *big.Int) bool {
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// The block pow must be less than the claimed target
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powNum := CalculateProofOfWorkValue(header)
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// The block hash must be less or equal than the claimed target.
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return powNum.Cmp(target) <= 0
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}
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// CheckProofOfWorkByBits check's if the block has a valid PoW according to its Bits field
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// it does not check if the difficulty itself is valid or less than the maximum for the appropriate network
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func CheckProofOfWorkByBits(header externalapi.MutableBlockHeader) bool {
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return CheckProofOfWorkWithTarget(header, difficulty.CompactToBig(header.Bits()))
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}
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// CalculateProofOfWorkValue hashes the given header and returns its big.Int value
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func CalculateProofOfWorkValue(header externalapi.MutableBlockHeader) *big.Int {
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// Zero out the time and nonce.
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timestamp, nonce := header.TimeInMilliseconds(), header.Nonce()
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header.SetTimeInMilliseconds(0)
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header.SetNonce(0)
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prePowHash := consensushashing.HeaderHash(header)
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matrix := generateMatrix(prePowHash)
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header.SetTimeInMilliseconds(timestamp)
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header.SetNonce(nonce)
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// PRE_POW_HASH || TIME || 32 zero byte padding || NONCE
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writer := hashes.NewPoWHashWriter()
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writer.InfallibleWrite(prePowHash.ByteSlice())
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err := serialization.WriteElement(writer, timestamp)
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if err != nil {
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panic(errors.Wrap(err, "this should never happen. Hash digest should never return an error"))
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}
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zeroes := [32]byte{}
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writer.InfallibleWrite(zeroes[:])
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err = serialization.WriteElement(writer, nonce)
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if err != nil {
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panic(errors.Wrap(err, "this should never happen. Hash digest should never return an error"))
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}
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powHash := writer.Finalize()
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heavyHash := matrix.HeavyHash(powHash)
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return toBig(heavyHash)
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}
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// ToBig converts a externalapi.DomainHash into a big.Int treated as a little endian string.
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func toBig(hash *externalapi.DomainHash) *big.Int {
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// We treat the Hash as little-endian for PoW purposes, but the big package wants the bytes in big-endian, so reverse them.
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buf := hash.ByteSlice()
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blen := len(buf)
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for i := 0; i < blen/2; i++ {
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buf[i], buf[blen-1-i] = buf[blen-1-i], buf[i]
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}
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return new(big.Int).SetBytes(buf)
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}
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// BlockLevel returns the block level of the given header.
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func BlockLevel(header externalapi.BlockHeader) int {
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// Genesis is defined to be the root of all blocks at all levels, so we define it to be the maximal
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// block level.
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if len(header.DirectParents()) == 0 {
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return constants.MaxBlockLevel
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}
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proofOfWorkValue := CalculateProofOfWorkValue(header.ToMutable())
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for blockLevel := 0; ; blockLevel++ {
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if blockLevel == constants.MaxBlockLevel || proofOfWorkValue.Bit(blockLevel+1) != 0 {
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return blockLevel
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}
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}
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}
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