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docs: add spec for latest EIP712 signatures (#1234)
Adds spec for latest EIP712 signature changes. Also refactors the code structure a bit. category: docs ticket: #1203
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,106 @@ | ||
| // Copyright © 2022 Obol Labs Inc. | ||
| // | ||
| // This program is free software: you can redistribute it and/or modify it | ||
| // under the terms of the GNU General Public License as published by the Free | ||
| // Software Foundation, either version 3 of the License, or (at your option) | ||
| // any later version. | ||
| // | ||
| // This program 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 General Public License for | ||
| // more details. | ||
| // | ||
| // You should have received a copy of the GNU General Public License along with | ||
| // this program. If not, see <http://www.gnu.org/licenses/>. | ||
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| package cluster | ||
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| import ( | ||
| "crypto/ecdsa" | ||
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| ethmath "github.com/ethereum/go-ethereum/common/math" | ||
| "github.com/ethereum/go-ethereum/crypto" | ||
| "github.com/ethereum/go-ethereum/signer/core/apitypes" | ||
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| "github.com/obolnetwork/charon/app/errors" | ||
| "github.com/obolnetwork/charon/eth2util" | ||
| ) | ||
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| // eip712Type defines the EIP712 (https://eips.ethereum.org/EIPS/eip-712) Primary type and the Message field and value. | ||
| type eip712Type struct { | ||
| PrimaryType string | ||
| Field string | ||
| ValueFunc func(Definition, Operator) string | ||
| } | ||
|
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||
| var ( | ||
| // eip712ConfigHash defines the EIP712 structure of the config signature. | ||
| eip712ConfigHash = eip712Type{ | ||
| PrimaryType: "ConfigHash", | ||
| Field: "config_hash", | ||
| ValueFunc: func(definition Definition, _ Operator) string { | ||
| return to0xHex(definition.ConfigHash) | ||
| }, | ||
| } | ||
|
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| // eip712ENR defines the EIP712 structure of the enr signature. | ||
| eip712ENR = eip712Type{ | ||
| PrimaryType: "ENR", | ||
| Field: "enr", | ||
| ValueFunc: func(_ Definition, operator Operator) string { | ||
| return operator.ENR | ||
| }, | ||
| } | ||
| ) | ||
|
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| // digestEIP712 returns the digest for the EIP712 structured type for the provided definition and operator. | ||
| func digestEIP712(typ eip712Type, def Definition, operator Operator) ([]byte, error) { | ||
| chainID, err := eth2util.ForkVersionToChainID(def.ForkVersion) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| data := apitypes.TypedData{ | ||
| Types: apitypes.Types{ | ||
| "EIP712Domain": []apitypes.Type{ | ||
| {Name: "name", Type: "string"}, | ||
| {Name: "version", Type: "string"}, | ||
| {Name: "chainId", Type: "uint256"}, | ||
| }, | ||
| typ.PrimaryType: []apitypes.Type{ | ||
| {Name: typ.Field, Type: "string"}, | ||
| }, | ||
| }, | ||
| PrimaryType: typ.PrimaryType, | ||
| Message: apitypes.TypedDataMessage{ | ||
| typ.Field: typ.ValueFunc(def, operator), | ||
| }, | ||
| Domain: apitypes.TypedDataDomain{ | ||
| Name: "Obol", | ||
| Version: "1", | ||
| ChainId: ethmath.NewHexOrDecimal256(chainID), | ||
| }, | ||
| } | ||
|
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| digest, _, err := apitypes.TypedDataAndHash(data) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "hash EIP712") | ||
| } | ||
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| return digest, nil | ||
| } | ||
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| // signEIP712 returns the EIP712 signature for the primary type. | ||
| func signEIP712(secret *ecdsa.PrivateKey, typ eip712Type, def Definition, operator Operator) ([]byte, error) { | ||
| digest, err := digestEIP712(typ, def, operator) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
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| sig, err := crypto.Sign(digest, secret) | ||
| if err != nil { | ||
| return nil, errors.Wrap(err, "sign EIP712") | ||
| } | ||
|
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| return sig, nil | ||
| } |
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