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package core
import (
"bytes"
"crypto/sha256"
)
// Hash is the type for a hash data packet
type Hash [32]byte
// IsZero returns true if the Hash is empty (all zeroes)
func (h *Hash) IsZero() bool {
z := Hash{}
if bytes.Equal(z[:], h[:]) {
return true
}
return false
}
// HashBytes performs a hash over a given byte array
func HashBytes(b []byte) Hash {
h := sha256.Sum256(b)
return h
}
// PoWData is the interface for the data that have the Nonce parameter to calculate the Proof-of-Work
type PoWData interface {
Bytes() []byte
GetNonce() uint64
IncrementNonce()
}
// CheckPoW verifies the PoW difficulty of a Hash
func CheckPoW(hash Hash, difficulty uint64) bool {
var empty [32]byte
if !bytes.Equal(hash[:][0:difficulty], empty[0:difficulty]) {
return false
}
return true
}
// CalculatePoW calculates the nonce for the given data in order to fit in the current Proof of Work difficulty
func CalculatePoW(data PoWData, difficulty uint64) (uint64, error) {
hash := HashBytes(data.Bytes())
for !CheckPoW(hash, difficulty) {
data.IncrementNonce()
hash = HashBytes(data.Bytes())
}
return data.GetNonce(), nil
}