fill clear text buffer of BuildRequestRecord

I2NPProtocol.cpp

@@ -316,6 +316,12 @@ namespace i2p
 		memcpy (record + BUILD_REQUEST_RECORD_TO_PEER_OFFSET, (const uint8_t *)router.GetIdentHash (), 16);
 	}
 
+	void EncryptBuildRequestRecord (const i2p::data::RouterInfo& router, const uint8_t * clearText, uint8_t * record)
+	{
+		router.GetElGamalEncryption ()->Encrypt (clearText, BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE, record + BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET);
+		memcpy (record + BUILD_REQUEST_RECORD_TO_PEER_OFFSET, (const uint8_t *)router.GetIdentHash (), 16);
+	}
+	
 	bool HandleBuildRequestRecords (int num, uint8_t * records, I2NPBuildRequestRecordClearText& clearText)
 	{
 		for (int i = 0; i < num; i++)

I2NPProtocol.h

@@ -44,6 +44,21 @@ namespace i2p
 	// TunnelBuild	
 	const size_t TUNNEL_BUILD_RECORD_SIZE = 528;
 
+	//BuildRequestRecordClearText
+	const size_t BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET = 0;
+	const size_t BUILD_REQUEST_RECORD_OUR_IDENT_OFFSET = BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET + 4;
+	const size_t BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET = BUILD_REQUEST_RECORD_OUR_IDENT_OFFSET + 32;
+	const size_t BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET = BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET + 4;
+	const size_t BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET = BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET + 32;
+	const size_t BUILD_REQUEST_RECORD_IV_KEY_OFFSET = BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET + 32;
+	const size_t BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET = BUILD_REQUEST_RECORD_IV_KEY_OFFSET + 32;
+	const size_t BUILD_REQUEST_RECORD_REPLY_IV_OFFSET = BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET + 32;
+	const size_t BUILD_REQUEST_RECORD_FLAG_OFFSET = BUILD_REQUEST_RECORD_REPLY_IV_OFFSET + 16;
+	const size_t BUILD_REQUEST_RECORD_REQUEST_TIME_OFFSET = BUILD_REQUEST_RECORD_FLAG_OFFSET + 1;
+	const size_t BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET = BUILD_REQUEST_RECORD_REQUEST_TIME_OFFSET + 4;
+	const size_t BUILD_REQUEST_RECORD_PADDING_OFFSET = BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET + 4;
+	const size_t BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE = 222;
+	
 	// BuildRequestRecordEncrypted	
 	const size_t BUILD_REQUEST_RECORD_TO_PEER_OFFSET = 0;
 	const size_t BUILD_REQUEST_RECORD_ENCRYPTED_OFFSET = BUILD_REQUEST_RECORD_TO_PEER_OFFSET + 16;
@@ -214,6 +229,7 @@ namespace tunnel
 	          bool isGateway, bool isEndpoint);
 	void EncryptBuildRequestRecord (const i2p::data::RouterInfo& router, 
 		const I2NPBuildRequestRecordClearText& clearText, uint8_t * record);
+	void EncryptBuildRequestRecord (const i2p::data::RouterInfo& router, const uint8_t * clearText, uint8_t * record);
 	
 	bool HandleBuildRequestRecords (int num, uint8_t * records, I2NPBuildRequestRecordClearText& clearText);
 	void HandleVariableTunnelBuildMsg (uint32_t replyMsgID, uint8_t * buf, size_t len);

Tunnel.cpp

@@ -48,16 +48,9 @@ namespace tunnel
 		while (hop)
 		{
 			int idx = recordIndicies[i];
-			EncryptBuildRequestRecord (*hop->router,
-				CreateBuildRequestRecord (hop->router->GetIdentHash (), 
-				    hop->tunnelID,
-					hop->nextRouter->GetIdentHash (), 
-					hop->nextTunnelID,
-					hop->layerKey, hop->ivKey,                  
-					hop->replyKey, hop->replyIV,
-					hop->next ? rnd.GenerateWord32 () : replyMsgID, // we set replyMsgID for last hop only
-				    hop->isGateway, hop->isEndpoint), 
-		    	records + idx*TUNNEL_BUILD_RECORD_SIZE);
+			uint8_t clearText[BUILD_REQUEST_RECORD_CLEAR_TEXT_SIZE];
+			hop->CreateBuildRequestRecord (clearText, hop->next ? rnd.GenerateWord32 () : replyMsgID); // we set replyMsgID for last hop only 
+			EncryptBuildRequestRecord (*hop->router, clearText, records + idx*TUNNEL_BUILD_RECORD_SIZE);
 			hop->recordIndex = idx; 
 			i++;
 			hop = hop->next;

TunnelConfig.h

@@ -8,6 +8,7 @@
 #include "aes.h"
 #include "RouterInfo.h"
 #include "RouterContext.h"
+#include "Timestamp.h"
 
 namespace i2p
 {
@@ -82,6 +83,25 @@ namespace tunnel
 				isGateway = false;
 			}	
 		}
+
+		void CreateBuildRequestRecord (uint8_t * record, uint32_t replyMsgID)
+		{
+			htobe32buf (record + BUILD_REQUEST_RECORD_RECEIVE_TUNNEL_OFFSET, tunnelID); 
+			memcpy (record + BUILD_REQUEST_RECORD_OUR_IDENT_OFFSET, router->GetIdentHash (), 32);
+			htobe32buf (record + BUILD_REQUEST_RECORD_NEXT_TUNNEL_OFFSET, nextTunnelID);
+			memcpy (record + BUILD_REQUEST_RECORD_NEXT_IDENT_OFFSET, nextRouter->GetIdentHash (), 32);
+			memcpy (record + BUILD_REQUEST_RECORD_LAYER_KEY_OFFSET, layerKey, 32);
+			memcpy (record + BUILD_REQUEST_RECORD_IV_KEY_OFFSET, ivKey, 32);
+			memcpy (record + BUILD_REQUEST_RECORD_REPLY_KEY_OFFSET, replyKey, 32);
+			memcpy (record + BUILD_REQUEST_RECORD_REPLY_IV_OFFSET, replyIV, 16);
+			uint8_t flag = 0;
+			if (isGateway) flag |= 0x80;
+			if (isEndpoint) flag |= 0x40;
+			record[BUILD_REQUEST_RECORD_FLAG_OFFSET] = flag;
+			htobe32buf (record + BUILD_REQUEST_RECORD_REQUEST_TIME_OFFSET, i2p::util::GetHoursSinceEpoch ()); 
+			htobe32buf (record + BUILD_REQUEST_RECORD_SEND_MSG_ID_OFFSET, replyMsgID); 
+			// TODO: fill padding
+		}	
 	};	
 
 	class TunnelConfig