[core] Initialize CRYSPR in startup() (#2425)

Multiple threads can initialize the SPR at one time. This is a particular problem with the MbedTLS implementation as some additional static initialization performed for this SPR can lead to a crash.

srtcore/api.cpp

@@ -254,6 +254,8 @@ int srt::CUDTUnited::startup()
         throw CUDTException(MJ_SETUP, MN_NONE, WSAGetLastError());
 #endif
 
+    CCryptoControl::globalInit();
+
     PacketFilter::globalInit();
 
     if (m_bGCStatus)

srtcore/api.h

@@ -216,6 +216,7 @@ class CUDTUnited
     friend class CUDT;
     friend class CUDTGroup;
     friend class CRendezvousQueue;
+    friend class CCryptoControl;
 
 public:
     CUDTUnited();

srtcore/crypto.cpp

@@ -26,6 +26,7 @@ written by
 #include "crypto.h"
 #include "logging.h"
 #include "core.h"
+#include "api.h"
 
 using namespace srt_logging;
 
@@ -69,6 +70,15 @@ std::string KmStateStr(SRT_KM_STATE state)
 
 using srt_logging::KmStateStr;
 
+void srt::CCryptoControl::globalInit()
+{
+#ifdef SRT_ENABLE_ENCRYPTION
+    // We need to force the Cryspr to be initialized during startup to avoid the
+    // possibility of multiple threads initialzing the same static data later on.
+    HaiCryptCryspr_Get_Instance();
+#endif
+}
+
 #if ENABLE_LOGGING
 std::string srt::CCryptoControl::FormatKmMessage(std::string hdr, int cmd, size_t srtlen)
 {

srtcore/crypto.h

@@ -86,6 +86,8 @@ class CCryptoControl
 
 public:
 
+    static void globalInit();
+
     bool sendingAllowed()
     {
         // This function is called to state as to whether the