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eip712.go
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eip712.go
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// Copyright 2022 storyicon@foxmail.com
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package sigverify
import (
"fmt"
ethcommon "github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/signer/core/apitypes"
)
// HashTypedData is used to calculate the hash of EIP-712 conformant typed data
// hash = keccak256("\x19${byteVersion}${domainSeparator}${hashStruct(message)}")
func HashTypedData(data apitypes.TypedData) ([]byte, []byte, error) {
domainSeparator, err := data.HashStruct("EIP712Domain", data.Domain.Map())
if err != nil {
return nil, nil, err
}
dataHash, err := data.HashStruct(data.PrimaryType, data.Message)
if err != nil {
return nil, nil, err
}
prefixedData := []byte(fmt.Sprintf("\x19\x01%s%s", string(domainSeparator), string(dataHash)))
prefixedDataHash := crypto.Keccak256(prefixedData)
return dataHash, prefixedDataHash, nil
}
// RecoveryTypedDataAddressEx is used to recover the signer address of the TypedData signature
func RecoveryTypedDataAddressEx(data apitypes.TypedData, signature []byte) (ethcommon.Address, error) {
_, dataHash, err := HashTypedData(data)
if err != nil {
return ethcommon.Address{}, err
}
return RecoveryAddressEx(dataHash, signature)
}
// VerifyTypedDataSignatureEx is used to verify the signer address of the TypedData signature
func VerifyTypedDataSignatureEx(address ethcommon.Address, data apitypes.TypedData, signature []byte) (bool, error) {
recoveredAddress, err := RecoveryTypedDataAddressEx(data, signature)
if err != nil {
return false, err
}
return recoveredAddress == address, nil
}
// VerifyTypedDataHexSignatureEx is used to verify the signer address of the TypedData signature
func VerifyTypedDataHexSignatureEx(address ethcommon.Address, data apitypes.TypedData, signature string) (bool, error) {
sig, err := HexDecode(signature)
if err != nil {
return false, err
}
recoveredAddress, err := RecoveryTypedDataAddressEx(data, sig)
if err != nil {
return false, err
}
return recoveredAddress == address, nil
}