From d189a6bedc6bd1b8564f8b4e914955e9ea5b2251 Mon Sep 17 00:00:00 2001
From: arnaucube <root@arnaucube.com>
Date: Wed, 22 Apr 2020 14:53:31 +0200
Subject: [PATCH] Expose SkToBigInt for usage from other packages & repos

---
 babyjub/eddsa.go | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/babyjub/eddsa.go b/babyjub/eddsa.go
index 3093a4a..f2c9b32 100644
--- a/babyjub/eddsa.go
+++ b/babyjub/eddsa.go
@@ -36,6 +36,13 @@ func NewRandPrivKey() PrivateKey {
 // Scalar converts a private key into the scalar value s following the EdDSA
 // standard, and using blake-512 hash.
 func (k *PrivateKey) Scalar() *PrivKeyScalar {
+	s := SkToBigInt(k)
+	return NewPrivKeyScalar(s)
+}
+
+// SkToBigInt converts a private key into the *big.Int value following the
+// EdDSA standard, and using blake-512 hash
+func SkToBigInt(k *PrivateKey) *big.Int {
 	sBuf := Blake512(k[:])
 	sBuf32 := [32]byte{}
 	copy(sBuf32[:], sBuf[:32])
@@ -43,7 +50,7 @@ func (k *PrivateKey) Scalar() *PrivKeyScalar {
 	s := new(big.Int)
 	utils.SetBigIntFromLEBytes(s, sBuf32[:])
 	s.Rsh(s, 3)
-	return NewPrivKeyScalar(s)
+	return s
 }
 
 // Pub returns the public key corresponding to a private key.