Use raw string for SIP crypto test payload

Replace the long SIP/SDP test fixture with a raw string literal and
normalize it with ReplaceLineEndings(CRLF) so the protocol payload stays
stable across LF and CRLF checkouts.

Set the unit test project to C# 14 and import Polyfills so the call also
compiles for net462.

Author: paulomorgado

test/unit/SIPSorcery.UnitTests.csproj

@@ -5,6 +5,7 @@
     <IsPackable>false</IsPackable>
     <SuppressTfmSupportBuildWarnings>true</SuppressTfmSupportBuildWarnings>
     <TreatWarningsAsErrors>True</TreatWarningsAsErrors>
+    <LangVersion>14.0</LangVersion>
   </PropertyGroup>
 
   <ItemGroup>

test/unit/net/SDP/SDPSecurityDescriptionUnitTest.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Text;
 using Microsoft.Extensions.Logging;
+using Polyfills;
 using SIPSorcery.SIP;
 using SIPSorcery.UnitTests;
 using Xunit;
@@ -165,8 +166,44 @@ public void ParseCryptoSIPMessage()
             logger.BeginScope(TestHelper.GetCurrentMethodName());
 
             string sipMsg =
-            $"INVITE sip:33@10.2.0.110:5061;transport=tls SIP/2.0{CRLF}Via: SIP/2.0/TLS 10.2.19.102:58179;rport;branch=z9hG4bKPj9893426a070f4c26ab494ceb746836a6{CRLF}Max-Forwards: 70{CRLF}From: <sip:a@10.2.0.110>;tag=b0d60b9dda9043818dea1f0e8ff9667c{CRLF}To: <sip:33@10.2.0.110>{CRLF}Contact: <sip:a@10.2.19.102:58179;ob>{CRLF}Call-ID: 6410bc5eb6724efd8717831ac2af5c35{CRLF}CSeq: 9941 INVITE{CRLF}Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS{CRLF}Supported: replaces, 100rel, timer, norefersub{CRLF}Session-Expires: 1800{CRLF}Min-SE: 90{CRLF}User-Agent: MicroSIP/3.19.8{CRLF}Content-Type: application/sdp{CRLF}Content-Length:   720{CRLF}{CRLF}v=0{CRLF}o=- 3784977145 3784977145 IN IP4 10.2.19.102{CRLF}s=pjmedia{CRLF}b=AS:84{CRLF}t=0 0{CRLF}a=X-nat:0{CRLF}m=audio 4000 RTP/AVP 8 0 101{CRLF}c=IN IP4 10.2.19.102{CRLF}b=TIAS:64000{CRLF}a=rtcp:4001 IN IP4 10.2.19.102{CRLF}a=sendrecv{CRLF}a=rtpmap:8 PCMA/8000{CRLF}a=rtpmap:0 PCMU/8000{CRLF}a=rtpmap:101 telephone-event/8000{CRLF}a=fmtp:101 0-16{CRLF}a=ssrc:370289018 cname:089912e5446c1847{CRLF}a=crypto:1 AES_256_CM_HMAC_SHA1_80 inline:i/aQZXuTQXF8NcIPG/8ClKLXjzJZiZkFqNerJJaWtX9ShjuamMQgFocXUEkWCQ=={CRLF}a=crypto:2 AES_256_CM_HMAC_SHA1_32 inline:WEXYOzOomH16+KpVRc8RKHkGUEW6DdvYHWSFKePVy9RzC5DB2Ciw+4t9huV8KA=={CRLF}a=crypto:3 AES_CM_128_HMAC_SHA1_80 inline:6wGxadTFLGO9iKPSC8XfRQsOFDRFgJdmpBfdWp9r{CRLF}a=crypto:4 AES_CM_128_HMAC_SHA1_32 inline:SdihJallj5frjwWc5yeXbMZlJSLlS+o2bkH3Jsle"
-            ;
+                """
+                INVITE sip:33@10.2.0.110:5061;transport=tls SIP/2.0
+                Via: SIP/2.0/TLS 10.2.19.102:58179;rport;branch=z9hG4bKPj9893426a070f4c26ab494ceb746836a6
+                Max-Forwards: 70
+                From: <sip:a@10.2.0.110>;tag=b0d60b9dda9043818dea1f0e8ff9667c
+                To: <sip:33@10.2.0.110>
+                Contact: <sip:a@10.2.19.102:58179;ob>
+                Call-ID: 6410bc5eb6724efd8717831ac2af5c35
+                CSeq: 9941 INVITE
+                Allow: PRACK, INVITE, ACK, BYE, CANCEL, UPDATE, INFO, SUBSCRIBE, NOTIFY, REFER, MESSAGE, OPTIONS
+                Supported: replaces, 100rel, timer, norefersub
+                Session-Expires: 1800
+                Min-SE: 90
+                User-Agent: MicroSIP/3.19.8
+                Content-Type: application/sdp
+                Content-Length:   720
+
+                v=0
+                o=- 3784977145 3784977145 IN IP4 10.2.19.102
+                s=pjmedia
+                b=AS:84
+                t=0 0
+                a=X-nat:0
+                m=audio 4000 RTP/AVP 8 0 101
+                c=IN IP4 10.2.19.102
+                b=TIAS:64000
+                a=rtcp:4001 IN IP4 10.2.19.102
+                a=sendrecv
+                a=rtpmap:8 PCMA/8000
+                a=rtpmap:0 PCMU/8000
+                a=rtpmap:101 telephone-event/8000
+                a=fmtp:101 0-16
+                a=ssrc:370289018 cname:089912e5446c1847
+                a=crypto:1 AES_256_CM_HMAC_SHA1_80 inline:i/aQZXuTQXF8NcIPG/8ClKLXjzJZiZkFqNerJJaWtX9ShjuamMQgFocXUEkWCQ==
+                a=crypto:2 AES_256_CM_HMAC_SHA1_32 inline:WEXYOzOomH16+KpVRc8RKHkGUEW6DdvYHWSFKePVy9RzC5DB2Ciw+4t9huV8KA==
+                a=crypto:3 AES_CM_128_HMAC_SHA1_80 inline:6wGxadTFLGO9iKPSC8XfRQsOFDRFgJdmpBfdWp9r
+                a=crypto:4 AES_CM_128_HMAC_SHA1_32 inline:SdihJallj5frjwWc5yeXbMZlJSLlS+o2bkH3Jsle
+                """.ReplaceLineEndings(CRLF);
 
             SIPMessageBuffer sipMessageBuffer = SIPMessageBuffer.ParseSIPMessage(Encoding.UTF8.GetBytes(sipMsg), null, null);
             Assert.True(sipMessageBuffer != null, "The SIP message not parsed correctly.");