laconicd/types/utils.go

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package types
import (
"crypto/ecdsa"
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"crypto/sha256"
"fmt"
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sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/x/auth"
ethcmn "github.com/ethereum/go-ethereum/common"
ethcrypto "github.com/ethereum/go-ethereum/crypto"
"github.com/pkg/errors"
)
// GenerateAddress generates an Ethereum address.
func GenerateEthAddress() ethcmn.Address {
priv, err := ethcrypto.GenerateKey()
if err != nil {
panic(err)
}
return PrivKeyToEthAddress(priv)
}
// PrivKeyToEthAddress generates an Ethereum address given an ECDSA private key.
func PrivKeyToEthAddress(p *ecdsa.PrivateKey) ethcmn.Address {
return ethcrypto.PubkeyToAddress(ecdsa.PublicKey(p.PublicKey))
}
// ValidateSigner attempts to validate a signer for a given slice of bytes over
// which a signature and signer is given. An error is returned if address
// derived from the signature and bytes signed does not match the given signer.
func ValidateSigner(signBytes, sig []byte, signer ethcmn.Address) error {
pk, err := ethcrypto.SigToPub(signBytes, sig)
if err != nil {
return errors.Wrap(err, "failed to derive public key from signature")
} else if ethcrypto.PubkeyToAddress(*pk) != signer {
return fmt.Errorf("invalid signature for signer: %s", signer)
}
return nil
}
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// GetStdTxSignBytes returns the signature bytes for an auth.StdTx transaction
// that is compatible with Ethereum's signature mechanism.
func GetStdTxSignBytes(chainID string, accNum int64, seq int64, fee auth.StdFee, msgs []sdk.Msg, memo string) []byte {
signBytes := auth.StdSignBytes(chainID, accNum, seq, fee, msgs, "")
hash := sha256.Sum256(signBytes)
return hash[:]
}