From 9e9211771840f83f0905eecab4a7605876aed7cd Mon Sep 17 00:00:00 2001
From: Sergio Mena <sergio@informal.systems>
Date: Wed, 17 Jul 2024 15:46:34 +0200
Subject: [PATCH] Add function `GenPrivKeyFromSeed` (#5)

---
 curves/bls12381/secret_key.go | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/curves/bls12381/secret_key.go b/curves/bls12381/secret_key.go
index 917f627..9ebcd08 100644
--- a/curves/bls12381/secret_key.go
+++ b/curves/bls12381/secret_key.go
@@ -23,8 +23,13 @@ func RandKey() (SecretKey, error) {
 	if err != nil {
 		return nil, err
 	}
+	return GenPrivKeyFromSeed(ikm)
+}
+
+// GenPrivKeyFromSeed creates a new private key directly from the seed passed as parameter
+func GenPrivKeyFromSeed(seed [32]byte) (SecretKey, error) {
 	// Defensive check, that we have not generated a secret key,
-	secKey := &bls12SecretKey{blst.KeyGen(ikm[:])}
+	secKey := &bls12SecretKey{blst.KeyGen(seed[:])}
 	if IsZero(secKey.Marshal()) {
 		return nil, errors.New("received secret key is zero")
 	}