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From 55299517f39e2e1a34df05c27cbc9898071ac9db Mon Sep 17 00:00:00 2001
From: Lennart Grahl <lennart.grahl@gmail.com>
Date: Mon, 18 May 2020 18:01:08 +0200
Subject: [PATCH] Fix two-byte RTP header extension encryption
Also ignores the application bits as required by RFC 8285, sec 4.3
Fixes #490
---
srtp/srtp.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/srtp/srtp.c b/srtp/srtp.c
index b45cee0f..176b01f0 100644
--- a/srtp/srtp.c
+++ b/srtp/srtp.c
@@ -1423,7 +1423,7 @@ static srtp_err_status_t srtp_process_header_encryption(
xtn_hdr_data++;
}
}
- } else if ((ntohs(xtn_hdr->profile_specific) & 0x1fff) == 0x100) {
+ } else if ((ntohs(xtn_hdr->profile_specific) & 0xfff0) == 0x1000) {
/* RFC 5285, section 4.3. Two-Byte Header */
while (xtn_hdr_data + 1 < xtn_hdr_end) {
uint8_t xid = *xtn_hdr_data;
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