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Merge pull request #331 from multiversx/signing
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| package ethereum | ||
|
|
||
| import ( | ||
| "crypto/ecdsa" | ||
| "math/big" | ||
| "os" | ||
|
|
||
| "github.com/ethereum/go-ethereum/accounts/abi/bind" | ||
| "github.com/ethereum/go-ethereum/common" | ||
| ethCrypto "github.com/ethereum/go-ethereum/crypto" | ||
| "github.com/multiversx/mx-bridge-eth-go/core/converters" | ||
| ) | ||
|
|
||
| type cryptoHandler struct { | ||
| privateKey *ecdsa.PrivateKey | ||
| publicKey *ecdsa.PublicKey | ||
| address common.Address | ||
| } | ||
|
|
||
| // NewCryptoHandler creates a new instance of type cryptoHandler able to sign messages and provide the containing public key | ||
| func NewCryptoHandler(privateKeyFilename string) (*cryptoHandler, error) { | ||
| privateKeyBytes, err := os.ReadFile(privateKeyFilename) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| privateKeyString := converters.TrimWhiteSpaceCharacters(string(privateKeyBytes)) | ||
| privateKey, err := ethCrypto.HexToECDSA(privateKeyString) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
|
|
||
| publicKey := privateKey.Public() | ||
| publicKeyECDSA, ok := publicKey.(*ecdsa.PublicKey) | ||
| if !ok { | ||
| return nil, errPublicKeyCast | ||
| } | ||
|
|
||
| return &cryptoHandler{ | ||
| privateKey: privateKey, | ||
| publicKey: publicKeyECDSA, | ||
| address: ethCrypto.PubkeyToAddress(*publicKeyECDSA), | ||
| }, nil | ||
| } | ||
|
|
||
| // Sign signs the provided message hash with the containing private key | ||
| func (handler *cryptoHandler) Sign(msgHash common.Hash) ([]byte, error) { | ||
| return ethCrypto.Sign(msgHash.Bytes(), handler.privateKey) | ||
| } | ||
|
|
||
| // GetAddress returns the corresponding address of the containing public key | ||
| func (handler *cryptoHandler) GetAddress() common.Address { | ||
| return handler.address | ||
| } | ||
|
|
||
| // CreateKeyedTransactor creates a keyed transactor used to create transactions on Ethereum chain | ||
| func (handler *cryptoHandler) CreateKeyedTransactor(chainId *big.Int) (*bind.TransactOpts, error) { | ||
| return bind.NewKeyedTransactorWithChainID(handler.privateKey, chainId) | ||
| } | ||
|
|
||
| // IsInterfaceNil returns true if there is no value under the interface | ||
| func (handler *cryptoHandler) IsInterfaceNil() bool { | ||
| return handler == nil | ||
| } |
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