80 lines
2.2 KiB
Go
80 lines
2.2 KiB
Go
package typeddata
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import (
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"crypto/ecdsa"
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"fmt"
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"math/big"
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"github.com/ethereum/go-ethereum/common"
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"github.com/ethereum/go-ethereum/common/hexutil"
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"github.com/ethereum/go-ethereum/crypto"
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signercore "github.com/ethereum/go-ethereum/signer/core/apitypes"
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)
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var (
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// x19 to avoid collision with rlp encode. x01 version byte defined in EIP-191
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messagePadding = []byte{0x19, 0x01}
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)
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func encodeData(typed TypedData) (rst common.Hash, err error) {
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domainSeparator, err := hashStruct(eip712Domain, typed.Domain, typed.Types)
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if err != nil {
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return rst, err
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}
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primary, err := hashStruct(typed.PrimaryType, typed.Message, typed.Types)
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if err != nil {
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return rst, err
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}
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return crypto.Keccak256Hash(messagePadding, domainSeparator[:], primary[:]), nil
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}
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func encodeDataV4(typedData signercore.TypedData, chain *big.Int) ([]byte, error) {
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domainSeparator, err := typedData.HashStruct("EIP712Domain", typedData.Domain.Map())
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if err != nil {
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return nil, err
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}
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typedDataHash, err := typedData.HashStruct(typedData.PrimaryType, typedData.Message)
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if err != nil {
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return nil, err
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}
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rawData := []byte(fmt.Sprintf("\x19\x01%s%s", string(domainSeparator), string(typedDataHash)))
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sighash := crypto.Keccak256(rawData)
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return sighash, nil
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}
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func HashTypedDataV4(typedData signercore.TypedData, chain *big.Int) (common.Hash, error) {
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hashBytes, err := encodeDataV4(typedData, chain)
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if err != nil {
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return common.Hash{}, err
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}
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return common.BytesToHash(hashBytes), nil
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}
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func SignTypedDataV4(typedData signercore.TypedData, prv *ecdsa.PrivateKey, chain *big.Int) (hexutil.Bytes, error) {
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sighash, err := HashTypedDataV4(typedData, chain)
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if err != nil {
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return nil, err
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}
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sig, err := crypto.Sign(sighash[:], prv)
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if err != nil {
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return nil, err
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}
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sig[64] += 27
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return sig, nil
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}
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// Sign TypedData with a given private key. Verify that chainId in the typed data matches currently selected chain.
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func Sign(typed TypedData, prv *ecdsa.PrivateKey, chain *big.Int) ([]byte, error) {
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hash, err := ValidateAndHash(typed, chain)
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if err != nil {
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return nil, err
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}
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sig, err := crypto.Sign(hash[:], prv)
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if err != nil {
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return nil, err
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}
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sig[64] += 27
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return sig, nil
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}
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