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AccountCreationAuth compatible with js implementation

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arnaucube
2020-12-24 18:16:43 +01:00
parent cbcd387f98
commit ca010275e1
3 changed files with 135 additions and 14 deletions
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44
common/accountcreationauths.go
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@@ -2,6 +2,7 @@ package common
import (
"encoding/binary"
"strconv"
"time"
ethCommon "github.com/ethereum/go-ethereum/common"
@@ -9,10 +10,13 @@ import (
"github.com/iden3/go-iden3-crypto/babyjub"
)
// AccountCreationAuthMsg is the message that is signed to authorize an account
// creation
// AccountCreationAuthMsg is the message that is signed to authorize a Hermez
// account creation
const AccountCreationAuthMsg = "I authorize this babyjubjub key for hermez rollup account creation"
// EthMsgPrefix is the prefix for message signing at the Ethereum ecosystem
const EthMsgPrefix = "\x19Ethereum Signed Message:\n"
// AccountCreationAuth authorizations sent by users to the L2DB, to be used for
// account creations when necessary
type AccountCreationAuth struct {
@@ -22,18 +26,31 @@ type AccountCreationAuth struct {
Timestamp time.Time `meddler:"timestamp,utctime"`
}
// HashToSign builds the hash to be signed using BJJ pub key and the constant message
func (a *AccountCreationAuth) HashToSign(chainID uint16,
hermezContractAddr ethCommon.Address) ([]byte, error) {
// Calculate message to be signed
func (a *AccountCreationAuth) toHash(chainID uint16,
hermezContractAddr ethCommon.Address) []byte {
var chainIDBytes [2]byte
binary.BigEndian.PutUint16(chainIDBytes[:], chainID)
// to hash: [AccountCreationAuthMsg | compressedBJJ | chainID | hermezContractAddr]
return ethCrypto.Keccak256Hash([]byte(AccountCreationAuthMsg), a.BJJ[:], chainIDBytes[:],
hermezContractAddr[:]).Bytes(), nil
// [EthPrefix | AccountCreationAuthMsg | compressedBJJ | chainID | hermezContractAddr]
var b []byte
b = append(b, []byte(AccountCreationAuthMsg)...)
b = append(b, SwapEndianness(a.BJJ[:])...) // for js implementation compatibility
b = append(b, chainIDBytes[:]...)
b = append(b, hermezContractAddr[:]...)
ethPrefix := EthMsgPrefix + strconv.Itoa(len(b))
return append([]byte(ethPrefix), b...)
}
// VerifySignature ensures that the Signature is done with the specified EthAddr
// HashToSign returns the hash to be signed by the Etherum address to authorize
// the account creation
func (a *AccountCreationAuth) HashToSign(chainID uint16,
hermezContractAddr ethCommon.Address) ([]byte, error) {
b := a.toHash(chainID, hermezContractAddr)
return ethCrypto.Keccak256Hash(b).Bytes(), nil
}
// VerifySignature ensures that the Signature is done with the EthAddr, for the
// chainID and hermezContractAddress passed by parameter
func (a *AccountCreationAuth) VerifySignature(chainID uint16,
hermezContractAddr ethCommon.Address) bool {
// Calculate hash to be signed
@@ -41,8 +58,13 @@ func (a *AccountCreationAuth) VerifySignature(chainID uint16,
if err != nil {
return false
}
var sig [65]byte
copy(sig[:], a.Signature[:])
sig[64] -= 27
// Get public key from Signature
pubKBytes, err := ethCrypto.Ecrecover(msg, a.Signature)
pubKBytes, err := ethCrypto.Ecrecover(msg, sig[:])
if err != nil {
return false
}