lnd.xprv/lntypes/hash.go

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package lntypes
import (
"encoding/hex"
"fmt"
)
// HashSize of array used to store hashes.
const HashSize = 32
// Hash is used in several of the lightning messages and common structures. It
// typically represents a payment hash.
type Hash [HashSize]byte
// String returns the Hash as a hexadecimal string.
func (hash Hash) String() string {
return hex.EncodeToString(hash[:])
}
// MakeHash returns a new Hash from a byte slice. An error is returned if
// the number of bytes passed in is not HashSize.
func MakeHash(newHash []byte) (Hash, error) {
nhlen := len(newHash)
if nhlen != HashSize {
return Hash{}, fmt.Errorf("invalid hash length of %v, want %v",
nhlen, HashSize)
}
var hash Hash
copy(hash[:], newHash)
return hash, nil
}
// MakeHashFromStr creates a Hash from a hex hash string.
func MakeHashFromStr(newHash string) (Hash, error) {
// Return error if hash string is of incorrect length.
if len(newHash) != HashSize*2 {
return Hash{}, fmt.Errorf("invalid hash string length of %v, "+
"want %v", len(newHash), HashSize*2)
}
hash, err := hex.DecodeString(newHash)
if err != nil {
return Hash{}, err
}
return MakeHash(hash)
}