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crypto: add SignatureLength constant and use it everywhere (#19996)

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Original change by @jpeletier
This commit is contained in:
Felix Lange 2019-08-22 15:14:06 +02:00 committed by GitHub
parent b90cdbaa79
commit 54b271a86d
No known key found for this signature in database
GPG Key ID: 4AEE18F83AFDEB23
11 changed files with 46 additions and 33 deletions
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3
accounts/usbwallet/ledger.go
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@ -32,6 +32,7 @@ import (
"github.com/ethereum/go-ethereum/common"
"github.com/ethereum/go-ethereum/common/hexutil"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/rlp"
)
@ -341,7 +342,7 @@ func (w *ledgerDriver) ledgerSign(derivationPath []uint32, tx *types.Transaction
op = ledgerP1ContTransactionData
}
// Extract the Ethereum signature and do a sanity validation
if len(reply) != 65 {
if len(reply) != crypto.SignatureLength {
return common.Address{}, nil, errors.New("reply lacks signature")
}
signature := append(reply[1:], reply[0])

4
consensus/clique/clique.go
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@ -56,7 +56,7 @@ var (
epochLength = uint64(30000) // Default number of blocks after which to checkpoint and reset the pending votes
extraVanity = 32 // Fixed number of extra-data prefix bytes reserved for signer vanity
extraSeal = 65 // Fixed number of extra-data suffix bytes reserved for signer seal
extraSeal = crypto.SignatureLength // Fixed number of extra-data suffix bytes reserved for signer seal
nonceAuthVote = hexutil.MustDecode("0xffffffffffffffff") // Magic nonce number to vote on adding a new signer
nonceDropVote = hexutil.MustDecode("0x0000000000000000") // Magic nonce number to vote on removing a signer.
@ -728,7 +728,7 @@ func encodeSigHeader(w io.Writer, header *types.Header) {
header.GasLimit,
header.GasUsed,
header.Time,
header.Extra[:len(header.Extra)-65], // Yes, this will panic if extra is too short
header.Extra[:len(header.Extra)-crypto.SignatureLength], // Yes, this will panic if extra is too short
header.MixDigest,
header.Nonce,
})

3
core/genesis.go
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@ -31,6 +31,7 @@ import (
"github.com/ethereum/go-ethereum/core/rawdb"
"github.com/ethereum/go-ethereum/core/state"
"github.com/ethereum/go-ethereum/core/types"
"github.com/ethereum/go-ethereum/crypto"
"github.com/ethereum/go-ethereum/ethdb"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/params"
@ -377,7 +378,7 @@ func DeveloperGenesisBlock(period uint64, faucet common.Address) *Genesis {
// Assemble and return the genesis with the precompiles and faucet pre-funded
return &Genesis{
Config: &config,
ExtraData: append(append(make([]byte, 32), faucet[:]...), make([]byte, 65)...),
ExtraData: append(append(make([]byte, 32), faucet[:]...), make([]byte, crypto.SignatureLength)...),
GasLimit: 6283185,
Difficulty: big.NewInt(1),
Alloc: map[common.Address]GenesisAccount{

6
core/types/transaction_signing.go
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@ -193,8 +193,8 @@ func (s FrontierSigner) Equal(s2 Signer) bool {
// SignatureValues returns signature values. This signature
// needs to be in the [R || S || V] format where V is 0 or 1.
func (fs FrontierSigner) SignatureValues(tx *Transaction, sig []byte) (r, s, v *big.Int, err error) {
if len(sig) != 65 {
panic(fmt.Sprintf("wrong size for signature: got %d, want 65", len(sig)))
if len(sig) != crypto.SignatureLength {
panic(fmt.Sprintf("wrong size for signature: got %d, want %d", len(sig), crypto.SignatureLength))
}
r = new(big.Int).SetBytes(sig[:32])
s = new(big.Int).SetBytes(sig[32:64])
@ -229,7 +229,7 @@ func recoverPlain(sighash common.Hash, R, S, Vb *big.Int, homestead bool) (commo
}
// encode the signature in uncompressed format
r, s := R.Bytes(), S.Bytes()
sig := make([]byte, 65)
sig := make([]byte, crypto.SignatureLength)
copy(sig[32-len(r):32], r)
copy(sig[64-len(s):64], s)
sig[64] = V

9
crypto/crypto.go
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@ -34,6 +34,15 @@ import (
"golang.org/x/crypto/sha3"
)
//SignatureLength indicates the byte length required to carry a signature with recovery id.
const SignatureLength = 64 + 1 // 64 bytes ECDSA signature + 1 byte recovery id
// RecoveryIDOffset points to the byte offset within the signature that contains the recovery id.
const RecoveryIDOffset = 64
// DigestLength sets the signature digest exact length
const DigestLength = 32
var (
secp256k1N, _ = new(big.Int).SetString("fffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141", 16)
secp256k1halfN = new(big.Int).Div(secp256k1N, big.NewInt(2))

16
crypto/signature_cgo.go
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@ -47,24 +47,24 @@ func SigToPub(hash, sig []byte) (*ecdsa.PublicKey, error) {
//
// 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 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(hash []byte, prv *ecdsa.PrivateKey) (sig []byte, err error) {
if len(hash) != 32 {
return nil, fmt.Errorf("hash is required to be exactly 32 bytes (%d)", len(hash))
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 := math.PaddedBigBytes(prv.D, prv.Params().BitSize/8)
defer zeroBytes(seckey)
return secp256k1.Sign(hash, seckey)
return secp256k1.Sign(digestHash, seckey)
}
// VerifySignature checks that the given public key created signature over hash.
// 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, hash, signature []byte) bool {
return secp256k1.VerifySignature(pubkey, hash, signature)
func VerifySignature(pubkey, digestHash, signature []byte) bool {
return secp256k1.VerifySignature(pubkey, digestHash, signature)
}
// DecompressPubkey parses a public key in the 33-byte compressed format.

2
crypto/signature_nocgo.go
View File

@ -41,7 +41,7 @@ func Ecrecover(hash, sig []byte) ([]byte, error) {
// 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, 65)
btcsig := make([]byte, SignatureLength)
btcsig[0] = sig[64] + 27
copy(btcsig[1:], sig)

10
internal/ethapi/api.go
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@ -427,7 +427,7 @@ func (s *PrivateAccountAPI) Sign(ctx context.Context, data hexutil.Bytes, addr c
log.Warn("Failed data sign attempt", "address", addr, "err", err)
return nil, err
}
signature[64] += 27 // Transform V from 0/1 to 27/28 according to the yellow paper
signature[crypto.RecoveryIDOffset] += 27 // Transform V from 0/1 to 27/28 according to the yellow paper
return signature, nil
}
@ -442,13 +442,13 @@ func (s *PrivateAccountAPI) Sign(ctx context.Context, data hexutil.Bytes, addr c
//
// https://github.com/ethereum/go-ethereum/wiki/Management-APIs#personal_ecRecover
func (s *PrivateAccountAPI) EcRecover(ctx context.Context, data, sig hexutil.Bytes) (common.Address, error) {
if len(sig) != 65 {
return common.Address{}, fmt.Errorf("signature must be 65 bytes long")
if len(sig) != crypto.SignatureLength {
return common.Address{}, fmt.Errorf("signature must be %d bytes long", crypto.SignatureLength)
}
if sig[64] != 27 && sig[64] != 28 {
if sig[crypto.RecoveryIDOffset] != 27 && sig[crypto.RecoveryIDOffset] != 28 {
return common.Address{}, fmt.Errorf("invalid Ethereum signature (V is not 27 or 28)")
}
sig[64] -= 27 // Transform yellow paper V from 27/28 to 0/1
sig[crypto.RecoveryIDOffset] -= 27 // Transform yellow paper V from 27/28 to 0/1
rpk, err := crypto.SigToPub(accounts.TextHash(data), sig)
if err != nil {

2
miner/worker_test.go
View File

@ -95,7 +95,7 @@ func newTestWorkerBackend(t *testing.T, chainConfig *params.ChainConfig, engine
switch engine.(type) {
case *clique.Clique:
gspec.ExtraData = make([]byte, 32+common.AddressLength+65)
gspec.ExtraData = make([]byte, 32+common.AddressLength+crypto.SignatureLength)
copy(gspec.ExtraData[32:], testBankAddress[:])
case *ethash.Ethash:
default:

2
p2p/rlpx.go
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@ -47,7 +47,7 @@ const (
maxUint24 = ^uint32(0) >> 8
sskLen = 16 // ecies.MaxSharedKeyLength(pubKey) / 2
sigLen = 65 // elliptic S256
sigLen = crypto.SignatureLength // elliptic S256
pubLen = 64 // 512 bit pubkey in uncompressed representation without format byte
shaLen = 32 // hash length (for nonce etc)

4
whisper/whisperv6/doc.go
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@ -34,6 +34,8 @@ package whisperv6
import (
"time"
"github.com/ethereum/go-ethereum/crypto"
)
// Whisper protocol parameters
@ -55,7 +57,7 @@ const (
signatureFlag = byte(4)
TopicLength = 4 // in bytes
signatureLength = 65 // in bytes
signatureLength = crypto.SignatureLength // in bytes
aesKeyLength = 32 // in bytes
aesNonceLength = 12 // in bytes; for more info please see cipher.gcmStandardNonceSize & aesgcm.NonceSize()
keyIDSize = 32 // in bytes