From cdb2936244b345f68d036e071db428aa06006c5e Mon Sep 17 00:00:00 2001
From: Marco Oliverio <marco@wolfssl.com>
Date: Thu, 20 Jan 2022 11:03:40 +0100
Subject: [PATCH] dtls-srtp: PRF: fix correct order of client/server random in
 seed

see RFC 5705 Section 4
---
 src/ssl.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/ssl.c b/src/ssl.c
index 7a7540f94..4fc587b2c 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -1418,8 +1418,8 @@ int wolfSSL_export_dtls_srtp_keying_material(WOLFSSL* ssl,
     }
 
 #ifdef WOLFSSL_HAVE_PRF
-    XMEMCPY(seed,           ssl->arrays->serverRandom, RAN_LEN);
-    XMEMCPY(seed + RAN_LEN, ssl->arrays->clientRandom, RAN_LEN);
+    XMEMCPY(seed, ssl->arrays->clientRandom, RAN_LEN);
+    XMEMCPY(seed + RAN_LEN, ssl->arrays->serverRandom, RAN_LEN);
 
     PRIVATE_KEY_UNLOCK();
     ret = wc_PRF_TLSv1(out, profile->kdfBits,   /* out: generated keys / salt */