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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| package intents | ||
|
|
||
| import ( | ||
| "crypto/ecdsa" | ||
| "crypto/elliptic" | ||
| "crypto/rand" | ||
| "crypto/sha256" | ||
| "fmt" | ||
| "strings" | ||
|
|
||
| "github.com/0xsequence/ethkit/ethwallet" | ||
| "github.com/0xsequence/ethkit/go-ethereum/common" | ||
| ) | ||
|
|
||
| type Session interface { | ||
| SessionId() string | ||
| Sign(intent *Intent) error | ||
| } | ||
|
|
||
| type session256K1 struct { | ||
| wallet *ethwallet.Wallet | ||
| } | ||
|
|
||
| func NewSession256K1(wallet *ethwallet.Wallet) Session { | ||
| return &session256K1{wallet: wallet} | ||
| } | ||
|
|
||
| func (s session256K1) SessionId() string { | ||
| return strings.ToLower( | ||
| fmt.Sprintf( | ||
| "0x%s", | ||
| common.Bytes2Hex( | ||
| append([]byte{byte(KeyTypeSECP256K1)}, s.wallet.Address().Bytes()...), | ||
| ), | ||
| ), | ||
| ) | ||
| } | ||
|
|
||
| func (s session256K1) Sign(intent *Intent) error { | ||
| hash, err := intent.Hash() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| signature, err := s.wallet.SignMessage(hash) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| intent.Signatures = append(intent.Signatures, &Signature{ | ||
| SessionId: s.SessionId(), | ||
| Signature: bytesToSignature(signature), | ||
| }) | ||
| return nil | ||
| } | ||
|
|
||
| type session256R1 struct { | ||
| privateKey *ecdsa.PrivateKey | ||
| } | ||
|
|
||
| func NewSession256R1(privateKey *ecdsa.PrivateKey) Session { | ||
| return &session256R1{privateKey: privateKey} | ||
| } | ||
|
|
||
| func (s session256R1) SessionId() string { | ||
| pubKey := elliptic.Marshal(s.privateKey.Curve, s.privateKey.PublicKey.X, s.privateKey.PublicKey.Y) | ||
| return strings.ToLower( | ||
| fmt.Sprintf( | ||
| "0x%s", | ||
| common.Bytes2Hex( | ||
| append([]byte{byte(KeyTypeSECP256R1)}, pubKey...), | ||
| ), | ||
| ), | ||
| ) | ||
| } | ||
|
|
||
| func (s session256R1) Sign(intent *Intent) error { | ||
| hash, err := intent.Hash() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| sha256Hash := sha256.Sum256(hash) | ||
|
|
||
| sr, ss, err := ecdsa.Sign(rand.Reader, s.privateKey, sha256Hash[:]) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| signature := append(sr.Bytes(), ss.Bytes()...) | ||
|
|
||
| intent.Signatures = append(intent.Signatures, &Signature{ | ||
| SessionId: s.SessionId(), | ||
| Signature: bytesToSignature(signature), | ||
| }) | ||
| return nil | ||
| } | ||
|
|
||
| func SignIntentWithWalletLegacy[T any](wallet *ethwallet.Wallet, intent *IntentTyped[T]) error { | ||
| hash, err := intent.Hash() | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| signature, err := wallet.SignMessage(hash) | ||
| if err != nil { | ||
| return err | ||
| } | ||
|
|
||
| intent.Signatures = append(intent.Signatures, &Signature{ | ||
| SessionId: strings.ToLower(wallet.Address().String()), | ||
| Signature: strings.ToLower(fmt.Sprintf("0x%s", common.Bytes2Hex(signature))), | ||
| }) | ||
| return nil | ||
| } | ||
|
|
||
| func bytesToSignature(sig []byte) string { | ||
| return strings.ToLower(fmt.Sprintf("0x%s", common.Bytes2Hex(sig))) | ||
| } |
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