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signature.go
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signature.go
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package types
import (
"bytes"
"cosmossdk.io/errors"
sdk "github.com/cosmos/cosmos-sdk/types"
sdkerrors "github.com/cosmos/cosmos-sdk/types/errors"
ethcrypto "github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/crypto/secp256k1"
)
func VerifySignature(sigAccAddress sdk.AccAddress, sigHash []byte, sig []byte) error {
if len(sig) != ethcrypto.SignatureLength {
return errors.Wrapf(sdkerrors.ErrorInvalidSigner, "signature length (actual: %d) doesn't match typical [R||S||V] signature 65 bytes", len(sig))
}
if sig[ethcrypto.RecoveryIDOffset] == 27 || sig[ethcrypto.RecoveryIDOffset] == 28 {
sig[ethcrypto.RecoveryIDOffset] -= 27
}
pubKeyBytes, err := secp256k1.RecoverPubkey(sigHash, sig)
if err != nil {
return errors.Wrap(err, "failed to recover delegated fee payer from sig")
}
ecPubKey, err := ethcrypto.UnmarshalPubkey(pubKeyBytes)
if err != nil {
return errors.Wrap(err, "failed to unmarshal recovered fee payer pubkey")
}
pubKeyAddr := ethcrypto.PubkeyToAddress(*ecPubKey)
if !bytes.Equal(pubKeyAddr.Bytes(), sigAccAddress.Bytes()) {
return errors.Wrapf(sdkerrors.ErrInvalidPubKey, "pubkey %s is different from approval pubkey %s", pubKeyAddr, sigAccAddress)
}
recoveredSignerAcc := sdk.AccAddress(pubKeyAddr.Bytes())
if !recoveredSignerAcc.Equals(sigAccAddress) {
return errors.Wrapf(sdkerrors.ErrorInvalidSigner, "failed to verify delegated fee payer %s signature", recoveredSignerAcc)
}
// VerifySignature of ethsecp256k1 accepts 64 byte signature [R||S]
// WARNING! Under NO CIRCUMSTANCES try to use pubKey.VerifySignature there
if !secp256k1.VerifySignature(pubKeyBytes, sigHash, sig[:len(sig)-1]) {
return errors.Wrap(sdkerrors.ErrorInvalidSigner, "unable to verify signer signature of EIP712 typed data")
}
return nil
}