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// This file is part of gnunet-go, a GNUnet-implementation in Golang.
// Copyright (C) 2019-2022 Bernd Fix >Y<
//
// gnunet-go is free software: you can redistribute it and/or modify it
// under the terms of the GNU Affero General Public License as published
// by the Free Software Foundation, either version 3 of the License,
// or (at your option) any later version.
//
// gnunet-go is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
//
// SPDX-License-Identifier: AGPL3.0-or-later
package crypto
import (
"bytes"
"crypto/sha512"
"encoding/hex"
"gnunet/util"
)
// HashCode is the result of a 512-bit hash function (SHA-512)
type HashCode struct {
Data []byte `size:"(Size)"`
}
// Equal tests if two hash results are equal.
func (hc *HashCode) Equal(n *HashCode) bool {
return bytes.Equal(hc.Data, n.Data)
}
// Size of binary data
func (hc *HashCode) Size() uint {
return 64
}
// Clone the hash code
func (hc *HashCode) Clone() *HashCode {
return &HashCode{
Data: util.Clone(hc.Data),
}
}
// String returns a hex-representation of the hash code
func (hc *HashCode) String() string {
return hex.EncodeToString(hc.Data)
}
// Short returns a short key representation
func (hc *HashCode) Short() string {
return util.Shorten(hc.String(), 20)
}
// NewHashCode creates a new (initialized) hash value
func NewHashCode(data []byte) *HashCode {
hc := new(HashCode)
size := hc.Size()
v := make([]byte, size)
if len(data) > 0 {
if uint(len(data)) < size {
util.CopyAlignedBlock(v, data)
} else {
copy(v, data[:size])
}
}
hc.Data = v
return hc
}
// Hash returns the SHA-512 hash value of a given blob
func Hash(data []byte) *HashCode {
val := sha512.Sum512(data)
return &HashCode{
Data: util.Clone(val[:]),
}
}
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