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