fixed race condition of openssl calls

Crypto.cpp

@@ -1,9 +1,13 @@
 #include <string.h>
 #include <string>
+#include <vector>
+#include <mutex>
 #include <openssl/sha.h>
 #include <openssl/dh.h>
 #include <openssl/md5.h>
 #include <openssl/rand.h>
+#include <openssl/ssl.h>
+#include <openssl/crypto.h>
 #include "Log.h"
 //#include "TunnelBase.h"
 #include "Crypto.h"
@@ -677,6 +681,33 @@ namespace crypto
 		m_IVDecryption.Decrypt ((ChipherBlock *)out, (ChipherBlock *)out); // double iv
 #endif
 	}	
+
+	std::vector <std::unique_ptr<std::mutex> >  m_OpenSSLMutexes;
+	static void OpensslLockingCallback(int mode, int type, const char * file, int line)
+	{
+		if (type > 0 && (size_t)type < m_OpenSSLMutexes.size ())
+		{
+			if (mode & CRYPTO_LOCK)
+				m_OpenSSLMutexes[type]->lock ();
+			else
+				m_OpenSSLMutexes[type]->unlock ();
+		}	
+	}
+	
+	void InitCrypto ()
+	{
+		SSL_library_init ();
+		auto numLocks = CRYPTO_num_locks();
+		for (int i = 0; i < numLocks; i++)
+		     m_OpenSSLMutexes.emplace_back (new std::mutex);
+		CRYPTO_set_locking_callback (OpensslLockingCallback);
+	}
+	
+	void TerminateCrypto ()
+	{
+		CRYPTO_set_locking_callback (nullptr);
+		m_OpenSSLMutexes.clear ();
+	}	
 }
 }