/
message.go
executable file
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/
message.go
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/*
* Copyright (c) 2018, https://github.com/airwide-code/airwide.datacenter
* All rights reserved.
*
*
*
*/
package mtproto
import (
"encoding/binary"
"fmt"
// "bytes"
"github.com/golang/glog"
// "encoding/hex"
"bytes"
"encoding/hex"
"github.com/airwide-code/airwide.datacenter/baselib/crypto"
)
const (
QUICK_ACKID = iota
UNENCRYPTED_MESSAGE
ENCRYPTED_MESSAGE
)
type MTProtoMessage interface {
// encode([]byte) ([]byte, error)
// decode([]byte) error
// MessageType() int
}
type QuickAckMessage struct {
ackId int32
}
func (m *QuickAckMessage) MessageType() int {
return QUICK_ACKID
}
func (m *QuickAckMessage) encode() ([]byte, error) {
return nil, nil
}
func (m *QuickAckMessage) decode(b []byte) error {
if len(b) != 4 {
return fmt.Errorf("Message len: %d (need 4)", len(b))
}
m.ackId = int32(binary.LittleEndian.Uint32(b))
return nil
}
type UnencryptedMessage struct {
NeedAck bool
// authKeyId int64
MessageId int64
// messageDataLength int32
// messageData []byte
// classID int32
Object TLObject
}
func (m *UnencryptedMessage) MessageType() int {
return UNENCRYPTED_MESSAGE
}
func (m *UnencryptedMessage) Encode() []byte {
buf, _ := m.encode()
return buf
}
func (m *UnencryptedMessage) encode() ([]byte, error) {
x := NewEncodeBuf(512)
x.Long(0)
m.MessageId = GenerateMessageId()
x.Long(m.MessageId)
if m.Object == nil {
x.Int(0)
} else {
b := m.Object.Encode()
x.Int(int32(len(b)))
x.Bytes(b)
}
return x.buf, nil
}
func (m *UnencryptedMessage) Decode(b []byte) error {
return m.decode(b)
}
func (m *UnencryptedMessage) decode(b []byte) error {
dbuf := NewDecodeBuf(b)
// m.authKeyId = dbuf.Long()
m.MessageId = dbuf.Long()
// glog.Info("messageId:", m.messageId)
// mod := m.messageId & 3
// if mod != 1 && mod != 3 {
// return fmt.Errorf("Wrong bits of message_id: %d", mod)
// }
messageLen := dbuf.Int()
if messageLen < 4 {
return fmt.Errorf("message len(%d) < 4", messageLen)
}
// glog.Info("messageLen:", m.messageId)
if int(messageLen) != dbuf.size-12 {
return fmt.Errorf("message len: %d (need %d)", messageLen, dbuf.size-12)
}
m.Object = dbuf.Object()
if m.Object == nil {
return fmt.Errorf("decode object is nil")
}
// proto.Message()
// glog.Info("Recved object: ", m.Object.(proto.Message).String())
return dbuf.err
}
////////////////////////////////////////////////////////////////////////////////////////////
// MsgDetailedInfo
type MsgDetailedInfoContainer struct {
Message *EncryptedMessage2
}
////////////////////////////////////////////////////////////////////////////////////////////
// TODO(@benqi): 将Encrypt和Descrypt移到底层
type EncryptedMessage2 struct {
authKeyId int64
NeedAck bool
msgKey []byte
Salt int64
SessionId int64
MessageId int64
SeqNo int32
Object TLObject
}
func NewEncryptedMessage2(authKeyId int64) *EncryptedMessage2 {
return &EncryptedMessage2{
authKeyId: authKeyId,
}
}
func (m *EncryptedMessage2) MessageType() int {
return ENCRYPTED_MESSAGE
}
func (m *EncryptedMessage2) Encode(authKeyId int64, authKey []byte) ([]byte, error) {
buf, err := m.encode(authKeyId, authKey)
return buf, err
}
func (m *EncryptedMessage2) encode(authKeyId int64, authKey []byte) ([]byte, error) {
objData := m.Object.Encode()
var additional_size = (32 + len(objData)) % 16
if additional_size != 0 {
additional_size = 16 - additional_size
}
if MTPROTO_VERSION == 2 && additional_size < 12 {
additional_size += 16
}
x := NewEncodeBuf(32 + len(objData) + additional_size)
// x.Long(authKeyId)
// msgKey := make([]byte, 16)
// x.Bytes(msgKey)
x.Long(m.Salt)
x.Long(m.SessionId)
if m.MessageId == 0 {
m.MessageId = GenerateMessageId()
}
x.Long(m.MessageId)
x.Int(m.SeqNo)
x.Int(int32(len(objData)))
x.Bytes(objData)
x.Bytes(crypto.GenerateNonce(additional_size))
// glog.Info("Encode object: ", m.Object)
encryptedData, _ := m.encrypt(authKey, x.buf)
x2 := NewEncodeBuf(56 + len(objData) + additional_size)
x2.Long(authKeyId)
x2.Bytes(m.msgKey)
x2.Bytes(encryptedData)
return x2.buf, nil
}
func (m *EncryptedMessage2) Decode(authKeyId int64, authKey, b []byte) error {
_ = authKeyId
return m.decode(authKey, b)
}
func (m *EncryptedMessage2) decode(authKey []byte, b []byte) error {
msgKey := b[:16]
// aesKey, aesIV := generateMessageKey(msgKey, authKey, false)
// x, err := doAES256IGEdecrypt(b[16:], aesKey, aesIV)
x, err := m.descrypt(msgKey, authKey, b[16:])
if err != nil {
return err
}
dbuf := NewDecodeBuf(x)
m.Salt = dbuf.Long() // salt
m.SessionId = dbuf.Long() // session_id
m.MessageId = dbuf.Long()
// mod := m.messageId & 3
// if mod != 1 && mod != 3 {
// return fmt.Errorf("Wrong bits of message_id: %d", mod)
// }
m.SeqNo = dbuf.Int()
messageLen := dbuf.Int()
if int(messageLen) > dbuf.size-32 {
// return fmt.Errorf("Message len: %d (need less than %d)", messagxeLen, dbuf.size-32)
}
// glog.Infof("salt: %d, sessionId: %d, messageId: %d, seqNo: %d, messageLen: %d", m.salt, m.SessionId, m.MessageId, m.SeqNo, messageLen)
m.Object = dbuf.Object()
if m.Object == nil {
return fmt.Errorf("Decode object is nil")
}
// glog.Info("Recved object: ", m.Object.String())
return nil
}
func (m *EncryptedMessage2) descrypt(msgKey, authKey, data []byte) ([]byte, error) {
// dbuf := NewDecodeBuf(data)
// m.authKeyId = dbuf.Long()
// msgKey := dbuf.Bytes(16)
var dataLen = uint32(len(data))
// 创建aesKey, aesIV
aesKey, aesIV := generateMessageKey(msgKey, authKey, false)
d := crypto.NewAES256IGECryptor(aesKey, aesIV)
x, err := d.Decrypt(data)
if err != nil {
glog.Error("descrypted data error: ", err)
return nil, err
}
//// 校验解密后的数据合法性
messageLen := binary.LittleEndian.Uint32(x[28:])
// glog.Info("descrypt - messageLen = ", messageLen)
if messageLen+32 > dataLen {
// return fmt.Errorf("Message len: %d (need less than %d)", messageLen, dbuf.size-32)
err = fmt.Errorf("descrypted data error: Wrong message length %d", messageLen)
glog.Error(err)
return nil, err
}
sha256MsgKey := make([]byte, 96)
switch MTPROTO_VERSION {
case 2:
t_d := make([]byte, 0, 32+dataLen)
t_d = append(t_d, authKey[88:88+32]...)
t_d = append(t_d, x[:dataLen]...)
copy(sha256MsgKey, crypto.Sha256Digest(t_d))
default:
copy(sha256MsgKey[4:], crypto.Sha1Digest(x))
}
if !bytes.Equal(sha256MsgKey[8:8+16], msgKey[:16]) {
err = fmt.Errorf("descrypted data error: (data: %s, aesKey: %s, aseIV: %s, authKeyId: %d, authKey: %s), msgKey verify error, sign: %s, msgKey: %s",
hex.EncodeToString(data[:64]),
hex.EncodeToString(aesKey),
hex.EncodeToString(aesIV),
m.authKeyId,
hex.EncodeToString(authKey[88:88+32]),
hex.EncodeToString(sha256MsgKey[8:8+16]),
hex.EncodeToString(msgKey[:16]))
glog.Error(err)
return nil, err
}
return x, nil
}
func (m *EncryptedMessage2) encrypt(authKey []byte, data []byte) ([]byte, error) {
message_key := make([]byte, 32)
switch MTPROTO_VERSION {
case 2:
t_d := make([]byte, 0, 32+len(data))
t_d = append(t_d, authKey[88+8:88+8+32]...)
t_d = append(t_d, data...)
copy(message_key, crypto.Sha256Digest(t_d))
default:
copy(message_key[4:], crypto.Sha1Digest(data))
}
// copy(message_key[8:], )
// memcpy(p_data + 8, message_key + 8, 16);
aesKey, aesIV := generateMessageKey(message_key[8:8+16], authKey, true)
e := crypto.NewAES256IGECryptor(aesKey, aesIV)
x, err := e.Encrypt(data)
if err != nil {
glog.Error("Encrypt data error: ", err)
return nil, err
}
m.msgKey = message_key[8 : 8+16]
return x, nil
}
////////////////////////////////////////////////////////////////////////////////////////////
//