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