package/ntpsec: fix libressl build

Fix the following libressl build failure raised since the addition of
the package in commit 27b8d0ba8c4004819e092fb81c0f64f284b3aa4a:

/home/buildroot/autobuild/instance-0/output-1/host/lib/gcc/armeb-buildroot-linux-gnueabi/11.3.0/../../../../armeb-buildroot-linux-gnueabi/bin/ld: libntp/libntp.a(ntp_random.c.1.o): in function `ntp_RAND_priv_bytes':
ntp_random.c:(.text+0xac): undefined reference to `RAND_priv_bytes'

Fixes:
 - http://autobuild.buildroot.org/results/a6a825b7f0efc7c82e8ecf792a1f9951ffb047c5

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>

package/ntpsec/0003-fix-build-with-libressl.patch

@@ -0,0 +1,80 @@
+From 743f16fb3fed9a05e601226f184be236614efe9a Mon Sep 17 00:00:00 2001
+From: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+Date: Fri, 12 Aug 2022 23:35:52 +0200
+Subject: [PATCH] fix build with libressl
+
+Fix the following build failure with libressl:
+
+/home/buildroot/autobuild/instance-0/output-1/host/lib/gcc/armeb-buildroot-linux-gnueabi/11.3.0/../../../../armeb-buildroot-linux-gnueabi/bin/ld: libntp/libntp.a(ntp_random.c.1.o): in function `ntp_RAND_priv_bytes':
+ntp_random.c:(.text+0xac): undefined reference to `RAND_priv_bytes'
+
+Fixes:
+ - http://autobuild.buildroot.org/results/a6a825b7f0efc7c82e8ecf792a1f9951ffb047c5
+
+Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
+[Upstream status:
+https://gitlab.com/NTPsec/ntpsec/-/merge_requests/1285]
+---
+ attic/cmac-timing.c | 2 ++
+ attic/random.c      | 8 ++++++++
+ libntp/ntp_random.c | 2 +-
+ 3 files changed, 11 insertions(+), 1 deletion(-)
+
+diff --git a/attic/cmac-timing.c b/attic/cmac-timing.c
+index 464daa76b..4f2fd3338 100644
+--- a/attic/cmac-timing.c
++++ b/attic/cmac-timing.c
+@@ -204,7 +204,9 @@ static void DoPKEY(
+ 		printf("## Oops, EVP_MD_CTX_new() failed.\n");
+ 		return;
+ 	}
++#ifdef EVP_MD_CTX_FLAG_FINALISE
+ 	EVP_MD_CTX_set_flags(ctx, EVP_MD_CTX_FLAG_FINALISE);
++#endif
+ 
+ 	clock_gettime(CLOCK_MONOTONIC, &start);
+ 	for (int i = 0; i < SAMPLESIZE; i++) {
+diff --git a/attic/random.c b/attic/random.c
+index 446c68535..8530ecd25 100644
+--- a/attic/random.c
++++ b/attic/random.c
+@@ -127,7 +127,11 @@ static int do_avg_priv(unsigned int bytes) {
+ 
+ 	clock_gettime(CLOCK_REALTIME, &start);
+ 	for (int i = 0; i < BATCHSIZE; i++) {
++#ifdef LIBRESSL_VERSION_NUMBER
++            err += RAND_bytes((unsigned char *)&rnd, bytes);
++#else
+             err += RAND_priv_bytes((unsigned char *)&rnd, bytes);
++#endif
+ 	}
+ 	clock_gettime(CLOCK_REALTIME, &stop);
+ 
+@@ -209,7 +213,11 @@ static int do_fast_priv(unsigned bytes) {
+ 
+ 	for (int i = 0; i < BATCHSIZE; i++) {
+                 clock_gettime(CLOCK_REALTIME, &start);
++#ifdef LIBRESSL_VERSION_NUMBER
++                err += RAND_bytes((unsigned char *)&rnd, bytes);
++#else
+                 err += RAND_priv_bytes((unsigned char *)&rnd, bytes);
++#endif
+ 		clock_gettime(CLOCK_REALTIME, &stop);
+ 		sec = (stop.tv_sec-start.tv_sec);
+ 		nanos = sec*BILLION + (stop.tv_nsec-start.tv_nsec);
+diff --git a/libntp/ntp_random.c b/libntp/ntp_random.c
+index 9304a790d..adb375b24 100644
+--- a/libntp/ntp_random.c
++++ b/libntp/ntp_random.c
+@@ -29,7 +29,7 @@ void ntp_RAND_bytes(unsigned char *buf, int num) {
+ 
+ void ntp_RAND_priv_bytes(unsigned char *buf, int num) {
+ 	int err;
+-#if (OPENSSL_VERSION_NUMBER > 0x1010100fL)
++#if (OPENSSL_VERSION_NUMBER > 0x1010100fL) && !defined(LIBRESSL_VERSION_NUMBER)
+ 	err = RAND_priv_bytes(buf, num);
+ #else
+ 	err = RAND_bytes(buf, num);
+-- 
+2.35.1
+