mirror of
https://github.com/kaspanet/kaspad.git
synced 2025-05-30 02:36:42 +00:00
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>
60 lines
2.2 KiB
Go
60 lines
2.2 KiB
Go
package hashes
|
|
|
|
import (
|
|
"github.com/kaspanet/kaspad/domain/consensus/model/externalapi"
|
|
"github.com/pkg/errors"
|
|
"golang.org/x/crypto/sha3"
|
|
"hash"
|
|
)
|
|
|
|
// HashWriter is used to incrementally hash data without concatenating all of the data to a single buffer
|
|
// it exposes an io.Writer api and a Finalize function to get the resulting hash.
|
|
// The used hash function is blake2b.
|
|
// This can only be created via one of the domain separated constructors
|
|
type HashWriter struct {
|
|
hash.Hash
|
|
}
|
|
|
|
// InfallibleWrite is just like write but doesn't return anything
|
|
func (h HashWriter) InfallibleWrite(p []byte) {
|
|
// This write can never return an error, this is part of the hash.Hash interface contract.
|
|
_, err := h.Write(p)
|
|
if err != nil {
|
|
panic(errors.Wrap(err, "this should never happen. hash.Hash interface promises to not return errors."))
|
|
}
|
|
}
|
|
|
|
// Finalize returns the resulting hash
|
|
func (h HashWriter) Finalize() *externalapi.DomainHash {
|
|
var sum [externalapi.DomainHashSize]byte
|
|
// This should prevent `Sum` for allocating an output buffer, by using the DomainHash buffer. we still copy because we don't want to rely on that.
|
|
copy(sum[:], h.Sum(sum[:0]))
|
|
return externalapi.NewDomainHashFromByteArray(&sum)
|
|
}
|
|
|
|
// ShakeHashWriter is exactly the same as HashWriter but for CShake256
|
|
type ShakeHashWriter struct {
|
|
sha3.ShakeHash
|
|
}
|
|
|
|
// InfallibleWrite is just like write but doesn't return anything
|
|
func (h *ShakeHashWriter) InfallibleWrite(p []byte) {
|
|
// This write can never return an error, this is part of the hash.Hash interface contract.
|
|
_, err := h.Write(p)
|
|
if err != nil {
|
|
panic(errors.Wrap(err, "this should never happen. sha3.ShakeHash interface promises to not return errors."))
|
|
}
|
|
}
|
|
|
|
// Finalize returns the resulting hash
|
|
func (h *ShakeHashWriter) Finalize() *externalapi.DomainHash {
|
|
var sum [externalapi.DomainHashSize]byte
|
|
// This should prevent `Sum` for allocating an output buffer, by using the DomainHash buffer. we still copy because we don't want to rely on that.
|
|
_, err := h.Read(sum[:])
|
|
if err != nil {
|
|
panic(errors.Wrap(err, "this should never happen. sha3.ShakeHash interface promises to not return errors."))
|
|
}
|
|
h.ShakeHash = nil // prevent double reading as it will return a different hash
|
|
return externalapi.NewDomainHashFromByteArray(&sum)
|
|
}
|