From 29a8d78e5cb958ef66a3c9075ea4b8bb88b0da40 Mon Sep 17 00:00:00 2001
From: cnderrauber <zengjie9004@gmail.com>
Date: Fri, 20 Aug 2021 19:10:51 +0800
Subject: [PATCH] add unencrypt cipher

---
 dtlstransport.go | 4 +++-
 go.mod           | 4 ++++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/dtlstransport.go b/dtlstransport.go
index 1837df9357c..05ad2b91ffd 100644
--- a/dtlstransport.go
+++ b/dtlstransport.go
@@ -309,7 +309,7 @@ func (t *DTLSTransport) Start(remoteParameters DTLSParameters) error {
 					PrivateKey:  cert.privateKey,
 				},
 			},
-			SRTPProtectionProfiles: []dtls.SRTPProtectionProfile{dtls.SRTP_AEAD_AES_128_GCM, dtls.SRTP_AES128_CM_HMAC_SHA1_80},
+			SRTPProtectionProfiles: []dtls.SRTPProtectionProfile{dtls.SRTP_UNENCRYPTED, dtls.SRTP_AEAD_AES_128_GCM, dtls.SRTP_AES128_CM_HMAC_SHA1_80},
 			ClientAuth:             dtls.RequireAnyClientCert,
 			LoggerFactory:          t.api.settingEngine.LoggerFactory,
 			InsecureSkipVerify:     true,
@@ -356,6 +356,8 @@ func (t *DTLSTransport) Start(remoteParameters DTLSParameters) error {
 		t.srtpProtectionProfile = srtp.ProtectionProfileAeadAes128Gcm
 	case dtls.SRTP_AES128_CM_HMAC_SHA1_80:
 		t.srtpProtectionProfile = srtp.ProtectionProfileAes128CmHmacSha1_80
+	case dtls.SRTP_UNENCRYPTED:
+		t.srtpProtectionProfile = srtp.ProtectionProfileUnencrypted
 	default:
 		t.onStateChange(DTLSTransportStateFailed)
 		return ErrNoSRTPProtectionProfile
diff --git a/go.mod b/go.mod
index e532c36d64f..b6c19bf1e61 100644
--- a/go.mod
+++ b/go.mod
@@ -21,3 +21,7 @@ require (
 	github.com/stretchr/testify v1.7.0
 	golang.org/x/net v0.0.0-20210420210106-798c2154c571
 )
+
+replace github.com/pion/srtp/v2 v2.0.2 => github.com/cnderrauber/srtp v2.0.6
+
+replace github.com/pion/dtls/v2 v2.0.9 => github.com/cnderrauber/dtls v2.0.10