extract timestamp for LS2

libi2pd/LeaseSet.cpp

@@ -13,12 +13,13 @@ namespace data
 {
 
 	LeaseSet::LeaseSet (bool storeLeases):
-		m_IsValid (false), m_StoreLeases (storeLeases), m_ExpirationTime (0), m_Buffer (nullptr), m_BufferLen (0)
+		m_IsValid (false), m_StoreLeases (storeLeases), m_ExpirationTime (0), m_EncryptionKey (nullptr), 
+		m_Buffer (nullptr), m_BufferLen (0)
 	{
 	}
 
 	LeaseSet::LeaseSet (const uint8_t * buf, size_t len, bool storeLeases):
-		m_IsValid (true), m_StoreLeases (storeLeases), m_ExpirationTime (0)
+		m_IsValid (true), m_StoreLeases (storeLeases), m_ExpirationTime (0), m_EncryptionKey (nullptr)
 	{
 		m_Buffer = new uint8_t[len];
 		memcpy (m_Buffer, buf, len);
@@ -56,7 +57,11 @@ namespace data
 			m_IsValid = false;
 			return;
 		}
-		memcpy (m_EncryptionKey, m_Buffer + size, 256);
+		if (m_StoreLeases)
+		{
+			if (!m_EncryptionKey) m_EncryptionKey = new uint8_t[256];
+			memcpy (m_EncryptionKey, m_Buffer + size, 256);
+		}	
 		size += 256; // encryption key
 		size += m_Identity->GetSigningPublicKeyLen (); // unused signing key
 		uint8_t num = m_Buffer[size];
@@ -231,6 +236,7 @@ namespace data
 
 	void LeaseSet::Encrypt (const uint8_t * data, uint8_t * encrypted, BN_CTX * ctx) const
 	{
+		if (!m_EncryptionKey) return;
 		auto encryptor = m_Identity->CreateEncryptor (m_EncryptionKey);
 		if (encryptor)
 			encryptor->Encrypt (data, encrypted, ctx, true);
@@ -395,6 +401,7 @@ namespace data
 	{
 		size_t offset = 0;
 		// blinded key
+		if (len < 2) return;
 		uint16_t blindedKeyType = bufbe16toh (buf + offset); offset += 2;
 		std::unique_ptr<i2p::crypto::Verifier> blindedVerifier (i2p::data::IdentityEx::CreateVerifier (blindedKeyType));
 		if (!blindedVerifier) return;
@@ -440,6 +447,35 @@ namespace data
 			encryptor->Encrypt (data, encrypted, ctx, true);	
 	}
 
+	uint64_t LeaseSet2::ExtractTimestamp (const uint8_t * buf, size_t len) const
+	{
+		if (len < 8) return 0;	
+		if (m_StoreType == NETDB_STORE_TYPE_ENCRYPTED_LEASESET2)
+		{
+			// encrypted LS2
+			size_t offset = 0;
+			uint16_t blindedKeyType = bufbe16toh (buf + offset); offset += 2;
+			std::unique_ptr<i2p::crypto::Verifier> blindedVerifier (i2p::data::IdentityEx::CreateVerifier (blindedKeyType));
+			if (!blindedVerifier) return 0 ;
+			auto blindedKeyLen = blindedVerifier->GetPublicKeyLen ();			
+			if (offset + blindedKeyLen + 6 >= len) return 0;
+			offset += blindedKeyLen;
+			uint32_t timestamp = bufbe32toh (buf + offset); offset += 4; 
+			uint16_t expires = bufbe16toh (buf + offset); offset += 2; 
+			return (timestamp + expires)* 1000LL;
+		}
+		else
+		{
+			auto identity = GetIdentity ();
+			if (!identity) return 0;
+			size_t offset = identity->GetFullLen ();
+			if (offset + 6 >= len) return 0;
+			uint32_t timestamp = bufbe32toh (buf + offset); offset += 4; 
+			uint16_t expires = bufbe16toh (buf + offset); offset += 2; 
+			return (timestamp + expires)* 1000LL;
+		}
+	}
+
 	LocalLeaseSet::LocalLeaseSet (std::shared_ptr<const IdentityEx> identity, const uint8_t * encryptionPublicKey, std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> > tunnels):
 		m_ExpirationTime (0), m_Identity (identity)
 	{

libi2pd/LeaseSet.h

@@ -59,7 +59,7 @@ namespace data
 		public:
 
 			LeaseSet (const uint8_t * buf, size_t len, bool storeLeases = true);
-			virtual ~LeaseSet () { delete[] m_Buffer; };
+			virtual ~LeaseSet () { delete[] m_EncryptionKey; delete[] m_Buffer; };
 			void Update (const uint8_t * buf, size_t len, bool verifySignature = true);
 			bool IsNewer (const uint8_t * buf, size_t len) const;
 			void PopulateLeases (); // from buffer
@@ -100,7 +100,7 @@ namespace data
 		private:
 
 			void ReadFromBuffer (bool readIdentity = true, bool verifySignature = true);
-			uint64_t ExtractTimestamp (const uint8_t * buf, size_t len) const; // returns max expiration time
+			virtual uint64_t ExtractTimestamp (const uint8_t * buf, size_t len) const; // returns max expiration time
 
 		private:
 
@@ -108,7 +108,7 @@ namespace data
 			std::set<std::shared_ptr<Lease>, LeaseCmp> m_Leases;
 			uint64_t m_ExpirationTime; // in milliseconds
 			std::shared_ptr<const IdentityEx> m_Identity;
-			uint8_t m_EncryptionKey[256];
+			uint8_t * m_EncryptionKey;
 			uint8_t * m_Buffer;
 			size_t m_BufferLen;
 	};
@@ -142,6 +142,8 @@ namespace data
 			template<typename Verifier>
 			bool VerifySignature (Verifier& verifier, const uint8_t * buf, size_t len, size_t signatureOffset);
 
+			uint64_t ExtractTimestamp (const uint8_t * buf, size_t len) const;
+
 		private:
 
 			uint8_t m_StoreType;