From 5f7387b9bb9090a368386b80d658433c72449453 Mon Sep 17 00:00:00 2001
From: Eugene Zagidullin <e.asphyx@gmail.com>
Date: Thu, 23 Jan 2025 21:10:15 +0200
Subject: [PATCH] re-export S256()

---
 crypt/common.go | 11 +++++------
 crypt/ecdsa.go  |  2 ++
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/crypt/common.go b/crypt/common.go
index 84a371d..0dad7f6 100644
--- a/crypt/common.go
+++ b/crypt/common.go
@@ -10,7 +10,6 @@ import (
 	"fmt"
 	"math/big"
 
-	"github.com/decred/dcrd/dcrec/secp256k1/v4"
 	"github.com/ecadlabs/goblst/minpk"
 	tz "github.com/ecadlabs/gotez/v2"
 	"github.com/ecadlabs/gotez/v2/b58"
@@ -66,7 +65,7 @@ func NewPrivateKey(priv tz.PrivateKey) (PrivateKey, error) {
 		return Ed25519PrivateKey(ed25519.NewKeyFromSeed(key[:])), nil
 
 	case *tz.Secp256k1PrivateKey:
-		p, err := unmarshalPrivateKey(key[:], secp256k1.S256())
+		p, err := unmarshalPrivateKey(key[:], S256())
 		if err != nil {
 			return nil, err
 		}
@@ -106,7 +105,7 @@ func NewPublicKey(pub tz.PublicKey) (PublicKey, error) {
 		)
 		switch key := pub.(type) {
 		case *tz.Secp256k1PublicKey:
-			curve = secp256k1.S256()
+			curve = S256()
 			data = key[:]
 		case *tz.P256PublicKey:
 			curve = elliptic.P256()
@@ -134,7 +133,7 @@ func NewPrivateKeyFrom(priv crypto.PrivateKey) (PrivateKey, error) {
 	switch priv := priv.(type) {
 	case *ecdsa.PrivateKey:
 		switch priv.Curve {
-		case secp256k1.S256(), elliptic.P256():
+		case S256(), elliptic.P256():
 			return (*ECDSAPrivateKey)(priv), nil
 		default:
 			return nil, ErrUnsupportedKeyType
@@ -154,7 +153,7 @@ func NewPublicKeyFrom(pub crypto.PublicKey) (PublicKey, error) {
 	switch pub := pub.(type) {
 	case *ecdsa.PublicKey:
 		switch pub.Curve {
-		case secp256k1.S256(), elliptic.P256():
+		case S256(), elliptic.P256():
 			return (*ECDSAPublicKey)(pub), nil
 		default:
 			return nil, ErrUnsupportedKeyType
@@ -184,7 +183,7 @@ func NewSignature(sig tz.Signature) (Signature, error) {
 		return &ECDSASignature{
 			R:     r,
 			S:     s,
-			Curve: secp256k1.S256(),
+			Curve: S256(),
 		}, nil
 
 	case *tz.P256Signature:
diff --git a/crypt/ecdsa.go b/crypt/ecdsa.go
index 651bc67..3d03de7 100644
--- a/crypt/ecdsa.go
+++ b/crypt/ecdsa.go
@@ -12,6 +12,8 @@ import (
 	tz "github.com/ecadlabs/gotez/v2"
 )
 
+func S256() *secp256k1.KoblitzCurve { return secp256k1.S256() }
+
 type ECDSAPrivateKey ecdsa.PrivateKey
 
 func (priv *ECDSAPrivateKey) ToBase58() []byte {