cerc-io/plugeth-utils
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cgo adjustments to avoid compile time errors

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This commit is contained in:
philip-morlier 2023-03-24 09:41:58 -07:00
parent 9127848510
commit 2f0a270ff2
2 changed files with 53 additions and 107 deletions
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74
restricted/crypto/signature_nocgo.go → restricted/crypto/signature.go
View File

@ -14,8 +14,6 @@
// 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/>.
// +build nacl js !cgo gofuzz
package crypto
import (
@ -23,37 +21,48 @@ import (
"crypto/elliptic"
"errors"
"fmt"
"math/big"
"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)
pub, err := sigToPub(hash, sig)
if err != nil {
return nil, err
}
bytes := (*btcec.PublicKey)(pub).SerializeUncompressed()
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) {
// Convert to btcec input format with 'recovery id' v at the beginning.
btcsig := make([]byte, SignatureLength)
btcsig[0] = sig[64] + 27
copy(btcsig[1:], sig)
pub, _, err := btcec.RecoverCompact(btcec.S256(), btcsig, hash)
return (*ecdsa.PublicKey)(pub), err
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 adversery. Common
// 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.
@ -64,14 +73,20 @@ func Sign(hash []byte, prv *ecdsa.PrivateKey) ([]byte, error) {
if prv.Curve != btcec.S256() {
return nil, fmt.Errorf("private key curve is not secp256k1")
}
sig, err := btcec.SignCompact(btcec.S256(), (*btcec.PrivateKey)(prv), hash, false)
// 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[64] = v
sig[RecoveryIDOffset] = v
return sig, nil
}
@ -82,13 +97,20 @@ func VerifySignature(pubkey, hash, signature []byte) bool {
if len(signature) != 64 {
return false
}
sig := &btcec.Signature{R: new(big.Int).SetBytes(signature[:32]), S: new(big.Int).SetBytes(signature[32:])}
key, err := btcec.ParsePubKey(pubkey, btcec.S256())
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 sig.S.Cmp(secp256k1halfN) > 0 {
if s.IsOverHalfOrder() {
return false
}
return sig.Verify(hash, key)
@ -99,16 +121,26 @@ 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, btcec.S256())
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.
// 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 {
return (*btcec.PublicKey)(pubkey).SerializeCompressed()
// 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.

86
restricted/crypto/signature_cgo.go
View File

@ -1,86 +0,0 @@
// 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/>.
// +build !nacl,!js,cgo,!gofuzz
package crypto
import (
"crypto/ecdsa"
"crypto/elliptic"
"fmt"
"github.com/openrelayxyz/plugeth-utils/restricted/crypto/secp256k1"
)
// Ecrecover returns the uncompressed public key that created the given signature.
func Ecrecover(hash, sig []byte) ([]byte, error) {
return secp256k1.RecoverPubkey(hash, sig)
}
// SigToPub returns the public key that created the given signature.
func SigToPub(hash, sig []byte) (*ecdsa.PublicKey, error) {
s, err := Ecrecover(hash, sig)
if err != nil {
return nil, err
}
x, y := elliptic.Unmarshal(S256(), s)
return &ecdsa.PublicKey{Curve: S256(), X: x, Y: y}, 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 digest cannot be chosen by an adversery. 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(digestHash []byte, prv *ecdsa.PrivateKey) (sig []byte, err error) {
if len(digestHash) != DigestLength {
return nil, fmt.Errorf("hash is required to be exactly %d bytes (%d)", DigestLength, len(digestHash))
}
seckey := PaddedBigBytes(prv.D, prv.Params().BitSize/8)
defer zeroBytes(seckey)
return secp256k1.Sign(digestHash, seckey)
}
// VerifySignature checks that the given public key created signature over digest.
// 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, digestHash, signature []byte) bool {
return secp256k1.VerifySignature(pubkey, digestHash, signature)
}
// DecompressPubkey parses a public key in the 33-byte compressed format.
func DecompressPubkey(pubkey []byte) (*ecdsa.PublicKey, error) {
x, y := secp256k1.DecompressPubkey(pubkey)
if x == nil {
return nil, fmt.Errorf("invalid public key")
}
return &ecdsa.PublicKey{X: x, Y: y, Curve: S256()}, nil
}
// CompressPubkey encodes a public key to the 33-byte compressed format.
func CompressPubkey(pubkey *ecdsa.PublicKey) []byte {
return secp256k1.CompressPubkey(pubkey.X, pubkey.Y)
}
// S256 returns an instance of the secp256k1 curve.
func S256() elliptic.Curve {
return secp256k1.S256()
}