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@ -25,8 +25,8 @@ import ( |
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"fmt" |
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"math/big" |
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"github.com/btcsuite/btcd/btcec/v2" |
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btc_ecdsa "github.com/btcsuite/btcd/btcec/v2/ecdsa" |
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"github.com/decred/dcrd/dcrec/secp256k1/v4" |
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decred_ecdsa "github.com/decred/dcrd/dcrec/secp256k1/v4/ecdsa" |
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) |
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// Ecrecover returns the uncompressed public key that created the given signature.
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@ -39,16 +39,16 @@ func Ecrecover(hash, sig []byte) ([]byte, error) { |
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return bytes, err |
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} |
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func sigToPub(hash, sig []byte) (*btcec.PublicKey, error) { |
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func sigToPub(hash, sig []byte) (*secp256k1.PublicKey, error) { |
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if len(sig) != SignatureLength { |
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return nil, errors.New("invalid signature") |
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} |
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// Convert to btcec input format with 'recovery id' v at the beginning.
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// Convert to secp256k1 input format with 'recovery id' v at the beginning.
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btcsig := make([]byte, SignatureLength) |
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btcsig[0] = sig[RecoveryIDOffset] + 27 |
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copy(btcsig[1:], sig) |
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pub, _, err := btc_ecdsa.RecoverCompact(btcsig, hash) |
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pub, _, err := decred_ecdsa.RecoverCompact(btcsig, hash) |
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return pub, err |
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} |
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@ -82,13 +82,13 @@ func Sign(hash []byte, prv *ecdsa.PrivateKey) ([]byte, error) { |
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if prv.Curve != S256() { |
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return nil, errors.New("private key curve is not secp256k1") |
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} |
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// ecdsa.PrivateKey -> btcec.PrivateKey
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var priv btcec.PrivateKey |
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// ecdsa.PrivateKey -> secp256k1.PrivateKey
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var priv secp256k1.PrivateKey |
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if overflow := priv.Key.SetByteSlice(prv.D.Bytes()); overflow || priv.Key.IsZero() { |
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return nil, errors.New("invalid private key") |
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} |
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defer priv.Zero() |
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sig := btc_ecdsa.SignCompact(&priv, hash, false) // ref uncompressed pubkey
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sig := decred_ecdsa.SignCompact(&priv, hash, false) // ref uncompressed pubkey
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// Convert to Ethereum signature format with 'recovery id' v at the end.
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v := sig[0] - 27 |
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copy(sig, sig[1:]) |
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@ -103,19 +103,19 @@ func VerifySignature(pubkey, hash, signature []byte) bool { |
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if len(signature) != 64 { |
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return false |
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} |
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var r, s btcec.ModNScalar |
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var r, s secp256k1.ModNScalar |
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if r.SetByteSlice(signature[:32]) { |
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return false // overflow
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} |
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if s.SetByteSlice(signature[32:]) { |
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return false |
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} |
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sig := btc_ecdsa.NewSignature(&r, &s) |
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key, err := btcec.ParsePubKey(pubkey) |
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sig := decred_ecdsa.NewSignature(&r, &s) |
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key, err := secp256k1.ParsePubKey(pubkey) |
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if err != nil { |
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return false |
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} |
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// Reject malleable signatures. libsecp256k1 does this check but btcec doesn't.
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// Reject malleable signatures. libsecp256k1 does this check but decred doesn't.
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if s.IsOverHalfOrder() { |
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return false |
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} |
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@ -127,7 +127,7 @@ func DecompressPubkey(pubkey []byte) (*ecdsa.PublicKey, error) { |
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if len(pubkey) != 33 { |
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return nil, errors.New("invalid compressed public key length") |
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} |
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key, err := btcec.ParsePubKey(pubkey) |
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key, err := secp256k1.ParsePubKey(pubkey) |
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if err != nil { |
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return nil, err |
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} |
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@ -148,20 +148,20 @@ func DecompressPubkey(pubkey []byte) (*ecdsa.PublicKey, error) { |
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// when constructing a PrivateKey.
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func CompressPubkey(pubkey *ecdsa.PublicKey) []byte { |
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// NOTE: the coordinates may be validated with
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// btcec.ParsePubKey(FromECDSAPub(pubkey))
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var x, y btcec.FieldVal |
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// secp256k1.ParsePubKey(FromECDSAPub(pubkey))
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var x, y secp256k1.FieldVal |
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x.SetByteSlice(pubkey.X.Bytes()) |
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y.SetByteSlice(pubkey.Y.Bytes()) |
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return btcec.NewPublicKey(&x, &y).SerializeCompressed() |
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return secp256k1.NewPublicKey(&x, &y).SerializeCompressed() |
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} |
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// S256 returns an instance of the secp256k1 curve.
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func S256() EllipticCurve { |
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return btCurve{btcec.S256()} |
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return btCurve{secp256k1.S256()} |
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} |
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type btCurve struct { |
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*btcec.KoblitzCurve |
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*secp256k1.KoblitzCurve |
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} |
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// Marshal converts a point given as (x, y) into a byte slice.
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Alex Gartner
1 month ago
committed by
GitHub