From 24212039b2d0cd0453b93f06bb31100fc35b6979 Mon Sep 17 00:00:00 2001
From: Ramana Kumar <ramana@member.fsf.org>
Date: Thu, 29 Sep 2022 19:32:23 +0100
Subject: [PATCH] Add conversions to/from uint64s to the interface

---
 min-src/c_kzg_4844.c | 9 +++++++++
 min-src/c_kzg_4844.h | 8 ++++++++
 2 files changed, 17 insertions(+)

diff --git a/min-src/c_kzg_4844.c b/min-src/c_kzg_4844.c
index 1537316..cace77c 100644
--- a/min-src/c_kzg_4844.c
+++ b/min-src/c_kzg_4844.c
@@ -753,6 +753,15 @@ static bool pairings_verify(const g1_t *a1, const g2_t *a2, const g1_t *b1, cons
 }
 
 
+void BLSFieldElement_from_uint64s(BLSFieldElement *out, const uint64_t in[4]) {
+  blst_fr_from_uint64(out, in);
+}
+
+void uint64s_from_BLSFieldElement(uint64_t out[4], const BLSFieldElement *in) {
+  blst_uint64_from_fr(out, in);
+}
+
+
 C_KZG_RET load_trusted_setup(KZGSettings *out, FILE *in) {
 
   uint64_t n2, i;
diff --git a/min-src/c_kzg_4844.h b/min-src/c_kzg_4844.h
index 699c38e..d0473fc 100644
--- a/min-src/c_kzg_4844.h
+++ b/min-src/c_kzg_4844.h
@@ -38,6 +38,14 @@ typedef g1_t KZGCommitment;
 typedef g1_t KZGProof;
 typedef fr_t BLSFieldElement;
 
+/**
+ * BLSFieldElements are communicated directly to/from clients,
+ * so we need to expose the functions for translating between this
+ * type and uint256. BLST represents uint256 as uint64[4].
+ */
+void BLSFieldElement_from_uint64s(BLSFieldElement *out, const uint64_t[4]);
+void uint64s_from_BLSFieldElement(uint64_t out[4], const BLSFieldElement*);
+
 /**
  * The common return type for all routines in which something can go wrong.
  *