Add support for eth_signedTypedData

CHANGELOG.md

@@ -1,3 +1,4 @@
+
 <!--
 Guiding Principles:
 
@@ -39,7 +40,9 @@ Ref: https://keepachangelog.com/en/1.0.0/
 
 ### Improvements
 
-- (log) [#948](https://github.com/tharsis/ethermint/pull/948) redirect go-ethereum's logs to cosmos-sdk logger.
+* (log) [#948](https://github.com/tharsis/ethermint/pull/948) redirect go-ethereum's logs to cosmos-sdk logger.
+* (rpc) [tharsis#953](https://github.com/tharsis/ethermint/pull/953) Add `eth_signTypedData` api support.
+
 
 ## [v0.10.0-beta1] - 2022-02-15
 

rpc/ethereum/namespaces/eth/api.go

@@ -7,6 +7,8 @@ import (
  "math"
  "math/big"
 
+ "github.com/ethereum/go-ethereum/signer/core/apitypes"
+
  "github.com/ethereum/go-ethereum/core/vm"
  "github.com/ethereum/go-ethereum/params"
  "github.com/ethereum/go-ethereum/rpc"
@@ -429,7 +431,41 @@ func (e *PublicAPI) Sign(address common.Address, data hexutil.Bytes) (hexutil.By
  return nil, err
  }
 
- signature[64] += 27 // Transform V from 0/1 to 27/28 according to the yellow paper
+ signature[crypto.RecoveryIDOffset] += 27 // Transform V from 0/1 to 27/28 according to the yellow paper
+ return signature, nil
+}
+
+// SignTypedData signs EIP-712 conformant typed data
+func (e *PublicAPI) SignTypedData(address common.Address, typedData apitypes.TypedData) (hexutil.Bytes, error) {
+ e.logger.Debug("eth_signTypedData", "address", address.Hex(), "data", typedData)
+ from := sdk.AccAddress(address.Bytes())
+
+ _, err := e.clientCtx.Keyring.KeyByAddress(from)
+ if err != nil {
+ e.logger.Error("failed to find key in keyring", "address", address.String())
+ return nil, fmt.Errorf("%s; %s", keystore.ErrNoMatch, err.Error())
+ }
+
+ domainSeparator, err := typedData.HashStruct("EIP712Domain", typedData.Domain.Map())
+ if err != nil {
+ return nil, err
+ }
+
+ typedDataHash, err := typedData.HashStruct(typedData.PrimaryType, typedData.Message)
+ if err != nil {
+ return nil, err
+ }
+
+ rawData := []byte(fmt.Sprintf("\x19\x01%s%s", string(domainSeparator), string(typedDataHash)))
+ sigHash := crypto.Keccak256(rawData)
+ // Sign the requested hash with the wallet
+ signature, _, err := e.clientCtx.Keyring.SignByAddress(from, sigHash)
+ if err != nil {
+ e.logger.Error("keyring.SignByAddress failed", "address", address.Hex())
+ return nil, err
+ }
+
+ signature[crypto.RecoveryIDOffset] += 27 // Transform V from 0/1 to 27/28 according to the yellow paper
  return signature, nil
 }