1 files changed, 152 insertions, 0 deletions
diff --git a/cli/vendor/github.com/ethereum/go-ethereum/crypto/signature_nocgo.go b/cli/vendor/github.com/ethereum/go-ethereum/crypto/signature_nocgo.go
new file mode 100644
index 0000000..3e48e51
--- /dev/null
+++ b/cli/vendor/github.com/ethereum/go-ethereum/crypto/signature_nocgo.go
@@ -0,0 +1,152 @@
+// Copyright 2017 The go-ethereum Authors
+// This file is part of the go-ethereum library.
+//
+// The go-ethereum library is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// The go-ethereum library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
+
+//go:build nacl || js || !cgo || gofuzz
+// +build nacl js !cgo gofuzz
+
+package crypto
+
+import (
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"errors"
+	"fmt"
+
+	"github.com/btcsuite/btcd/btcec/v2"
+	btc_ecdsa "github.com/btcsuite/btcd/btcec/v2/ecdsa"
+)
+
+// Ecrecover returns the uncompressed public key that created the given signature.
+func Ecrecover(hash, sig []byte) ([]byte, error) {
+	pub, err := sigToPub(hash, sig)
+	if err != nil {
+		return nil, err
+	}
+	bytes := pub.SerializeUncompressed()
+	return bytes, err
+}
+
+func sigToPub(hash, sig []byte) (*btcec.PublicKey, error) {
+	if len(sig) != SignatureLength {
+		return nil, errors.New("invalid signature")
+	}
+	// Convert to btcec input format with 'recovery id' v at the beginning.
+	btcsig := make([]byte, SignatureLength)
+	btcsig[0] = sig[RecoveryIDOffset] + 27
+	copy(btcsig[1:], sig)
+
+	pub, _, err := btc_ecdsa.RecoverCompact(btcsig, hash)
+	return pub, err
+}
+
+// SigToPub returns the public key that created the given signature.
+func SigToPub(hash, sig []byte) (*ecdsa.PublicKey, error) {
+	pub, err := sigToPub(hash, sig)
+	if err != nil {
+		return nil, err
+	}
+	return pub.ToECDSA(), nil
+}
+
+// Sign calculates an ECDSA signature.
+//
+// This function is susceptible to chosen plaintext attacks that can leak
+// information about the private key that is used for signing. Callers must
+// be aware that the given hash cannot be chosen by an adversary. Common
+// solution is to hash any input before calculating the signature.
+//
+// The produced signature is in the [R || S || V] format where V is 0 or 1.
+func Sign(hash []byte, prv *ecdsa.PrivateKey) ([]byte, error) {
+	if len(hash) != 32 {
+		return nil, fmt.Errorf("hash is required to be exactly 32 bytes (%d)", len(hash))
+	}
+	if prv.Curve != btcec.S256() {
+		return nil, fmt.Errorf("private key curve is not secp256k1")
+	}
+	// ecdsa.PrivateKey -> btcec.PrivateKey
+	var priv btcec.PrivateKey
+	if overflow := priv.Key.SetByteSlice(prv.D.Bytes()); overflow || priv.Key.IsZero() {
+		return nil, fmt.Errorf("invalid private key")
+	}
+	defer priv.Zero()
+	sig, err := btc_ecdsa.SignCompact(&priv, hash, false) // ref uncompressed pubkey
+	if err != nil {
+		return nil, err
+	}
+	// Convert to Ethereum signature format with 'recovery id' v at the end.
+	v := sig[0] - 27
+	copy(sig, sig[1:])
+	sig[RecoveryIDOffset] = v
+	return sig, nil
+}
+
+// VerifySignature checks that the given public key created signature over hash.
+// The public key should be in compressed (33 bytes) or uncompressed (65 bytes) format.
+// The signature should have the 64 byte [R || S] format.
+func VerifySignature(pubkey, hash, signature []byte) bool {
+	if len(signature) != 64 {
+		return false
+	}
+	var r, s btcec.ModNScalar
+	if r.SetByteSlice(signature[:32]) {
+		return false // overflow
+	}
+	if s.SetByteSlice(signature[32:]) {
+		return false
+	}
+	sig := btc_ecdsa.NewSignature(&r, &s)
+	key, err := btcec.ParsePubKey(pubkey)
+	if err != nil {
+		return false
+	}
+	// Reject malleable signatures. libsecp256k1 does this check but btcec doesn't.
+	if s.IsOverHalfOrder() {
+		return false
+	}
+	return sig.Verify(hash, key)
+}
+
+// DecompressPubkey parses a public key in the 33-byte compressed format.
+func DecompressPubkey(pubkey []byte) (*ecdsa.PublicKey, error) {
+	if len(pubkey) != 33 {
+		return nil, errors.New("invalid compressed public key length")
+	}
+	key, err := btcec.ParsePubKey(pubkey)
+	if err != nil {
+		return nil, err
+	}
+	return key.ToECDSA(), nil
+}
+
+// CompressPubkey encodes a public key to the 33-byte compressed format. The
+// provided PublicKey must be valid. Namely, the coordinates must not be larger
+// than 32 bytes each, they must be less than the field prime, and it must be a
+// point on the secp256k1 curve. This is the case for a PublicKey constructed by
+// elliptic.Unmarshal (see UnmarshalPubkey), or by ToECDSA and ecdsa.GenerateKey
+// when constructing a PrivateKey.
+func CompressPubkey(pubkey *ecdsa.PublicKey) []byte {
+	// NOTE: the coordinates may be validated with
+	// btcec.ParsePubKey(FromECDSAPub(pubkey))
+	var x, y btcec.FieldVal
+	x.SetByteSlice(pubkey.X.Bytes())
+	y.SetByteSlice(pubkey.Y.Bytes())
+	return btcec.NewPublicKey(&x, &y).SerializeCompressed()
+}
+
+// S256 returns an instance of the secp256k1 curve.
+func S256() elliptic.Curve {
+	return btcec.S256()
+}