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// Copyright 2018 The dexon-consensus Authors
// This file is part of the dexon-consensus library.
//
// The dexon-consensus library is free software: you can redistribute it
// and/or modify it under the terms of the GNU Lesser General Public License as
// published by the Free Software Foundation, either version 3 of the License,
// or (at your option) any later version.
//
// The dexon-consensus library 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 Lesser
// General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with the dexon-consensus library. If not, see
// <http://www.gnu.org/licenses/>.
package crypto
import (
"encoding/hex"
"fmt"
"github.com/dexon-foundation/dexon/crypto"
"github.com/dexon-foundation/dexon-consensus/common"
)
var (
// ErrSigToPubTypeNotFound is reported if the type is already used.
ErrSigToPubTypeNotFound = fmt.Errorf("type of sigToPub is not found")
// ErrSigToPubTypeAlreadyExist is reported if the type is already used.
ErrSigToPubTypeAlreadyExist = fmt.Errorf("type of sigToPub is already exist")
)
// SigToPubFn is a function to recover public key from signature.
type SigToPubFn func(hash common.Hash, signature Signature) (PublicKey, error)
var sigToPubCB map[string]SigToPubFn
func init() {
sigToPubCB = make(map[string]SigToPubFn)
}
// Keccak256Hash calculates and returns the Keccak256 hash of the input data,
// converting it to an internal Hash data structure.
func Keccak256Hash(data ...[]byte) (h common.Hash) {
return common.Hash(crypto.Keccak256Hash(data...))
}
// Clone returns a deep copy of a signature.
func (sig Signature) Clone() Signature {
return Signature{
Type: sig.Type,
Signature: sig.Signature[:],
}
}
func (sig Signature) String() string {
return hex.EncodeToString([]byte(sig.Signature[:]))
}
// RegisterSigToPub registers a sigToPub function of type.
func RegisterSigToPub(sigType string, sigToPub SigToPubFn) error {
if _, exist := sigToPubCB[sigType]; exist {
return ErrSigToPubTypeAlreadyExist
}
sigToPubCB[sigType] = sigToPub
return nil
}
// SigToPub recovers public key from signature.
func SigToPub(hash common.Hash, signature Signature) (PublicKey, error) {
sigToPub, exist := sigToPubCB[signature.Type]
if !exist {
return nil, ErrSigToPubTypeNotFound
}
return sigToPub(hash, signature)
}
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