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signature.go
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signature.go
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// Copyright (c) 2022 Gobalsky Labs Limited
//
// Use of this software is governed by the Business Source License included
// in the LICENSE.FURY file and at https://www.mariadb.com/bsl11.
//
// Change Date: 18 months from the later of the date of the first publicly
// available Distribution of this version of the repository, and 25 June 2022.
//
// On the date above, in accordance with the Business Source License, use
// of this software will be governed by version 3 or later of the GNU General
// Public License.
package crypto
import (
"errors"
"fmt"
wcrypto "github.com/elysiumstation/fury/wallet/crypto"
"github.com/ethereum/go-ethereum/common"
ecrypto "github.com/ethereum/go-ethereum/crypto"
)
var (
ErrAddressesDoesNotMatch = func(expected, recovered common.Address) error {
return fmt.Errorf("addresses does not match, expected(%s) recovered(%s)", expected.Hex(), recovered.Hex())
}
ErrInvalidSignature = errors.New("invalid signature")
ErrEthInvalidSignature = errors.New("invalid ethereum signature")
)
func VerifyEthereumSignature(message, signature []byte, hexAddress string) error {
address := common.HexToAddress(hexAddress)
hash := ecrypto.Keccak256(message)
if len(signature) <= ecrypto.RecoveryIDOffset {
return ErrEthInvalidSignature
}
// see reference in multisig control signature verification for more details
if signature[ecrypto.RecoveryIDOffset] == 27 || signature[ecrypto.RecoveryIDOffset] == 28 {
signature[ecrypto.RecoveryIDOffset] -= 27
}
// get the pubkey from the signature
pubkey, err := ecrypto.SigToPub(hash, signature)
if err != nil {
return err
}
// verify the signature
signatureNoID := signature[:len(signature)-1]
if !ecrypto.VerifySignature(ecrypto.CompressPubkey(pubkey), hash, signatureNoID) {
return ErrEthInvalidSignature
}
// ensure the signer is the expected ethereum wallet
signerAddress := ecrypto.PubkeyToAddress(*pubkey)
if address != signerAddress {
return ErrAddressesDoesNotMatch(address, signerAddress)
}
return nil
}
func VerifyFurySignature(message, signature, pubkey []byte) error {
alg := wcrypto.NewEd25519()
ok, err := alg.Verify(pubkey, message, signature)
if err != nil {
return err
}
if !ok {
return ErrInvalidSignature
}
return nil
}