Handle CreateLeaseSet2 I2CP message for encrypted leasesets

libi2pd/LeaseSet.cpp

@@ -907,5 +907,21 @@ namespace data
 		// store hash
 		m_StoreHash = blindedKey.GetStoreHash ();		
 	}
+
+	LocalEncryptedLeaseSet2::LocalEncryptedLeaseSet2 (std::shared_ptr<const IdentityEx> identity, const uint8_t * buf, size_t len):
+		LocalLeaseSet2 (NETDB_STORE_TYPE_ENCRYPTED_LEASESET2, identity, buf, len) 
+	{
+		// fill inner LeaseSet2 
+		auto blindedKey = std::make_shared<BlindedPublicKey>(identity);	
+		i2p::data::LeaseSet2 ls (buf, len, blindedKey); // inner layer
+		if (ls.IsValid ())
+		{
+			m_InnerLeaseSet = std::make_shared<LocalLeaseSet2>(ls.GetStoreType (), identity, ls.GetBuffer (), ls.GetBufferLen ());
+			m_StoreHash = blindedKey->GetStoreHash ();
+		}
+		else
+			LogPrint (eLogError, "LeaseSet2: couldn't extract inner layer");			
+	}
+	
 }
 }

libi2pd/LeaseSet.h

@@ -254,7 +254,7 @@ namespace data
 			LocalLeaseSet2 (uint8_t storeType, const i2p::data::PrivateKeys& keys, 
 				uint16_t keyType, uint16_t keyLen, const uint8_t * encryptionPublicKey, 
 				std::vector<std::shared_ptr<i2p::tunnel::InboundTunnel> > tunnels);
-			LocalLeaseSet2 (uint8_t storeType, std::shared_ptr<const IdentityEx> identity, const uint8_t * buf, size_t len);	
+			LocalLeaseSet2 (uint8_t storeType, std::shared_ptr<const IdentityEx> identity, const uint8_t * buf, size_t len);	// from I2CP
 		
 			virtual ~LocalLeaseSet2 () { delete[] m_Buffer; };
 			
@@ -279,6 +279,8 @@ namespace data
 
 			LocalEncryptedLeaseSet2 (std::shared_ptr<const LocalLeaseSet2> ls, const i2p::data::PrivateKeys& keys, i2p::data::SigningKeyType blindedKeyType = i2p::data::SIGNING_KEY_TYPE_REDDSA_SHA512_ED25519); 
 
+			LocalEncryptedLeaseSet2 (std::shared_ptr<const IdentityEx> identity, const uint8_t * buf, size_t len); // from I2CP
+
 			const IdentHash& GetStoreHash () const { return m_StoreHash; };
 			std::shared_ptr<const LocalLeaseSet> GetInnerLeaseSet () const { return m_InnerLeaseSet; };
 

libi2pd_client/I2CP.cpp

@@ -70,7 +70,9 @@ namespace client
 
 	void I2CPDestination::LeaseSet2Created (uint8_t storeType, const uint8_t * buf, size_t len)
 	{
-		auto ls = std::make_shared<i2p::data::LocalLeaseSet2> (storeType, m_Identity, buf, len);
+		auto ls = (storeType == i2p::data::NETDB_STORE_TYPE_ENCRYPTED_LEASESET2) ?
+			std::make_shared<i2p::data::LocalEncryptedLeaseSet2> (m_Identity, buf, len):
+			std::make_shared<i2p::data::LocalLeaseSet2> (storeType, m_Identity, buf, len);
 		ls->SetExpirationTime (m_LeaseSetExpirationTime);	
 		SetLeaseSet (ls);
 	}
@@ -528,21 +530,35 @@ namespace client
 			if (m_Destination)
 			{
 				uint8_t storeType = buf[offset]; offset++; // store type
-				// TODO: parse LS2 and obtain correct private keys lengths
-				size_t signingPrivateKeyLength = 0, encryptionPrivateKeyLength = 0;
-				if (storeType != i2p::data::NETDB_STORE_TYPE_META_LEASESET2) // no private keys for meta
+				i2p::data::LeaseSet2 ls (storeType, buf + offset, len - offset); // outer layer only for encrypted
+				if (!ls.IsValid ())
 				{
-					signingPrivateKeyLength = m_Destination->GetIdentity ()->GetSigningPrivateKeyLen (); // no offline keys
-					encryptionPrivateKeyLength = 256; // ElGamal only
-					if (len < offset + signingPrivateKeyLength + encryptionPrivateKeyLength)
+					LogPrint (eLogError, "I2CP: invalid LeaseSet2 of type ", storeType);
+					return;
+				}	
+				offset += ls.GetBufferLen ();
+				// private keys
+				int numPrivateKeys = buf[offset]; offset++;
+				uint16_t currentKeyType = 0;
+				const uint8_t * currentKey = nullptr;	
+				for (int i = 0; i < numPrivateKeys; i++)
+				{
+					if (offset + 4 > len) return;
+					uint16_t keyType = bufbe16toh (buf + offset); offset += 2; // encryption type
+					uint16_t keyLen = bufbe16toh (buf + offset); offset += 2;  // private key length
+					if (offset + keyLen > len) return;
+					if (keyType > currentKeyType)
 					{
-						LogPrint (eLogError, "I2CP: CreateLeaseSet2 message is too short ", len);
-						return;
+						currentKeyType = keyType;
+						currentKey = buf + offset;
 					}
-					m_Destination->SetEncryptionPrivateKey (buf + len - encryptionPrivateKeyLength);
-					// ignore signing private key
+					offset += keyLen;
 				}				
-				m_Destination->LeaseSet2Created (storeType, buf + offset, len - offset - signingPrivateKeyLength - encryptionPrivateKeyLength); 
+				// TODO: support multiple keys
+				if (currentKey)
+					m_Destination->SetEncryptionPrivateKey (currentKey);
+
+				m_Destination->LeaseSet2Created (storeType, ls.GetBuffer (), ls.GetBufferLen ()); 
 			}
 		}
 		else

libi2pd_client/I2CP.h

@@ -36,7 +36,7 @@ namespace client
 	const uint8_t I2CP_DESTROY_SESSION_MESSAGE = 3;
 	const uint8_t I2CP_REQUEST_VARIABLE_LEASESET_MESSAGE = 37;
 	const uint8_t I2CP_CREATE_LEASESET_MESSAGE = 4;
-	const uint8_t I2CP_CREATE_LEASESET2_MESSAGE = 40;
+	const uint8_t I2CP_CREATE_LEASESET2_MESSAGE = 41;
 	const uint8_t I2CP_SEND_MESSAGE_MESSAGE = 5;
 	const uint8_t I2CP_SEND_MESSAGE_EXPIRES_MESSAGE = 36;
 	const uint8_t I2CP_MESSAGE_PAYLOAD_MESSAGE = 31;