[src/trunk]: src/sys/net Use cprng_strong, not cprng_fast, for ephemeral key.

[riastradh <riastradh%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/4a1a7485027c
branches:  trunk
changeset: 1013071:4a1a7485027c
user:      riastradh <riastradh%NetBSD.org@localhost>
date:      Thu Aug 20 21:30:56 2020 +0000

description:
Use cprng_strong, not cprng_fast, for ephemeral key.

diffstat:

 sys/external/isc/libsodium/include/randombytes.h |  5 +++--
 sys/net/if_wg.c                                  |  6 +++---
 2 files changed, 6 insertions(+), 5 deletions(-)

diffs (45 lines):

diff -r a60134231c97 -r 4a1a7485027c sys/external/isc/libsodium/include/randombytes.h
--- a/sys/external/isc/libsodium/include/randombytes.h  Thu Aug 20 21:30:46 2020 +0000
+++ b/sys/external/isc/libsodium/include/randombytes.h  Thu Aug 20 21:30:56 2020 +0000
@@ -1,11 +1,12 @@
 /* This overwrites dist/src/libsodium/include/sodium/randombytes.h */
 
+#include <sys/cprng.h>
+
 static inline void
 randombytes_buf(void * const buf, const size_t size)
 {
 
-       extern size_t cprng_fast(void *, size_t);
-       cprng_fast(buf, size);
+       cprng_strong(kern_cprng, buf, size, 0);
 }
 
 static inline void
diff -r a60134231c97 -r 4a1a7485027c sys/net/if_wg.c
--- a/sys/net/if_wg.c   Thu Aug 20 21:30:46 2020 +0000
+++ b/sys/net/if_wg.c   Thu Aug 20 21:30:56 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: if_wg.c,v 1.2 2020/08/20 21:29:44 riastradh Exp $      */
+/*     $NetBSD: if_wg.c,v 1.3 2020/08/20 21:30:56 riastradh Exp $      */
 
 /*
  * Copyright (C) Ryota Ozaki <ozaki.ryota%gmail.com@localhost>
@@ -43,7 +43,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: if_wg.c,v 1.2 2020/08/20 21:29:44 riastradh Exp $");
+__KERNEL_RCSID(0, "$NetBSD: if_wg.c,v 1.3 2020/08/20 21:30:56 riastradh Exp $");
 
 #ifdef _KERNEL_OPT
 #include "opt_inet.h"
@@ -813,7 +813,7 @@
 
        CTASSERT(WG_EPHEMERAL_KEY_LEN == crypto_scalarmult_curve25519_BYTES);
 
-       cprng_fast(privkey, WG_EPHEMERAL_KEY_LEN);
+       cprng_strong(kern_cprng, privkey, WG_EPHEMERAL_KEY_LEN, 0);
        crypto_scalarmult_base(pubkey, privkey);
 }