From: Felix Fietkau <nbd@nbd.name>
Date: Fri, 11 Jul 2025 09:31:40 +0000 (+0200)
Subject: sntrup761: add function for deriving public key from secret key
X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=3e486baf8309196e3053281dfb47377e6db43ec4;p=project%2Funetd.git

sntrup761: add function for deriving public key from secret key

Signed-off-by: Felix Fietkau <nbd@nbd.name>
---

diff --git a/sntrup761.c b/sntrup761.c
index a125e5f..95bc853 100644
--- a/sntrup761.c
+++ b/sntrup761.c
@@ -2773,6 +2773,12 @@ next:
     return 0;
 }
 
+int sntrup761_pubkey(uint8_t *pk, const uint8_t *sk)
+{
+	memcpy(pk, sk + SecretKeys_bytes, SNTRUP761_PUB_SIZE);
+	return 0;
+}
+
 int sntrup761_enc(uint8_t *c, uint8_t *k, const uint8_t *pk)
 {
     Encap(c, k, pk);
diff --git a/sntrup761.h b/sntrup761.h
index 5ac4fab..b747e8d 100644
--- a/sntrup761.h
+++ b/sntrup761.h
@@ -10,6 +10,7 @@
 
 void sntrup761_set_batch(int val);
 int sntrup761_keypair(uint8_t *pk, uint8_t *sk);
+int sntrup761_pubkey(uint8_t *pk, const uint8_t *sk);
 int sntrup761_enc(uint8_t *c, uint8_t *k, const uint8_t *pk);
 int sntrup761_dec(uint8_t *k, const uint8_t *c, const uint8_t *sk);