fixed race condition

Garlic.cpp

@@ -187,8 +187,9 @@ namespace garlic
 			RAND_bytes (elGamal.preIV, 32); // Pre-IV
 			uint8_t iv[32]; // IV is first 16 bytes
 			SHA256(elGamal.preIV, 32, iv); 
-			i2p::crypto::ElGamalEncrypt (m_Destination->GetEncryptionPublicKey (), 
-				(uint8_t *)&elGamal, buf, m_Owner->GetBNContext (), true);			
+			BN_CTX * ctx = BN_CTX_new ();
+			i2p::crypto::ElGamalEncrypt (m_Destination->GetEncryptionPublicKey (), (uint8_t *)&elGamal, buf, ctx, true);	
+			BN_CTX_free (ctx);		
 			m_Encryption.SetIV (iv);
 			buf += 514;
 			len += 514;	

Garlic.h

@@ -158,7 +158,6 @@ namespace garlic
 
 			void CleanUp ();
 			void SetNumTags (int numTags) { m_NumTags = numTags; };	
-			BN_CTX * GetBNContext () const { return m_Ctx; };
 			std::shared_ptr<GarlicRoutingSession> GetRoutingSession (std::shared_ptr<const i2p::data::RoutingDestination> destination, bool attachLeaseSet);	
 			void CleanupExpiredTags ();
 			void RemoveDeliveryStatusSession (uint32_t msgID);
@@ -190,7 +189,7 @@ namespace garlic
 
 		private:
 
-			BN_CTX * m_Ctx;
+			BN_CTX * m_Ctx; // incoming
 			// outgoing sessions
 			int m_NumTags;
 			std::mutex m_SessionsMutex;