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internal/oicq: refactor & support unmarshal
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,130 @@ | ||
| package oicq | ||
|
|
||
| import ( | ||
| goBinary "encoding/binary" | ||
| "math/rand" | ||
|
|
||
| "github.com/pkg/errors" | ||
|
|
||
| "github.com/Mrs4s/MiraiGo/binary" | ||
| "github.com/Mrs4s/MiraiGo/internal/crypto" | ||
| ) | ||
|
|
||
| type Codec struct { | ||
| ecdh *crypto.ECDH | ||
| randomKey []byte | ||
|
|
||
| WtSessionTicketKey []byte | ||
| } | ||
|
|
||
| func NewCodec(uin int64) *Codec { | ||
| c := &Codec{ | ||
| ecdh: crypto.NewECDH(), | ||
| randomKey: make([]byte, 16), | ||
| } | ||
| rand.Read(c.randomKey) | ||
| c.ecdh.FetchPubKey(uin) | ||
| return c | ||
| } | ||
|
|
||
| type EncryptionMethod byte | ||
|
|
||
| const ( | ||
| EM_ECDH EncryptionMethod = iota | ||
| EM_ST | ||
| ) | ||
|
|
||
| type Message struct { | ||
| Uin uint32 | ||
| Command uint16 | ||
| EncryptionMethod EncryptionMethod | ||
| Body []byte | ||
| } | ||
|
|
||
| func (c *Codec) Marshal(m *Message) []byte { | ||
| w := binary.SelectWriter() | ||
| defer binary.PutWriter(w) | ||
|
|
||
| w.WriteByte(0x02) | ||
| w.WriteUInt16(0) // len 占位 | ||
| w.WriteUInt16(8001) // version? | ||
| w.WriteUInt16(m.Command) | ||
| w.WriteUInt16(1) | ||
| w.WriteUInt32(m.Uin) | ||
| w.WriteByte(0x03) | ||
| switch m.EncryptionMethod { | ||
| case EM_ECDH: | ||
| w.WriteByte(0x87) | ||
| case EM_ST: | ||
| w.WriteByte(0x45) | ||
| } | ||
| w.WriteByte(0) | ||
| w.WriteUInt32(2) | ||
| w.WriteUInt32(0) | ||
| w.WriteUInt32(0) | ||
|
|
||
| switch m.EncryptionMethod { | ||
| case EM_ECDH: | ||
| w.WriteByte(0x02) | ||
| w.WriteByte(0x01) | ||
| w.Write(c.randomKey) | ||
| w.WriteUInt16(0x01_31) | ||
| w.WriteUInt16(c.ecdh.SvrPublicKeyVer) | ||
| w.WriteUInt16(uint16(len(c.ecdh.PublicKey))) | ||
| w.Write(c.ecdh.PublicKey) | ||
| w.EncryptAndWrite(c.ecdh.ShareKey, m.Body) | ||
|
|
||
| case EM_ST: | ||
| w.WriteByte(0x01) | ||
| w.WriteByte(0x03) | ||
| w.Write(c.randomKey) | ||
| w.WriteUInt16(0x0102) | ||
| w.WriteUInt16(0x0000) | ||
| w.EncryptAndWrite(c.randomKey, m.Body) | ||
| } | ||
| w.WriteByte(0x03) | ||
|
|
||
| buf := append([]byte(nil), w.Bytes()...) | ||
| goBinary.BigEndian.PutUint16(buf[1:3], uint16(len(buf))) | ||
| return buf | ||
| } | ||
|
|
||
| var ( | ||
| ErrUnknownFlag = errors.New("unknown flag") | ||
| ErrUnknownEncryptType = errors.New("unknown encrypt type") | ||
| ) | ||
|
|
||
| func (c *Codec) Unmarshal(data []byte) (*Message, error) { | ||
| reader := binary.NewReader(data) | ||
| if flag := reader.ReadByte(); flag != 2 { | ||
| return nil, ErrUnknownFlag | ||
| } | ||
| m := new(Message) | ||
| reader.ReadUInt16() // len | ||
| reader.ReadUInt16() // version? | ||
| m.Command = reader.ReadUInt16() | ||
| reader.ReadUInt16() // 1? | ||
| m.Uin = uint32(reader.ReadInt32()) | ||
| reader.ReadByte() | ||
| encryptType := reader.ReadByte() | ||
| reader.ReadByte() | ||
| switch encryptType { | ||
| case 0: | ||
| m.Body = func() (decrypted []byte) { | ||
| d := reader.ReadBytes(reader.Len() - 1) | ||
| defer func() { | ||
| if pan := recover(); pan != nil { | ||
| tea := binary.NewTeaCipher(c.randomKey) | ||
| decrypted = tea.Decrypt(d) | ||
| } | ||
| }() | ||
| return binary.NewTeaCipher(c.ecdh.ShareKey).Decrypt(d) | ||
| }() | ||
| case 3: | ||
| d := reader.ReadBytes(reader.Len() - 1) | ||
| m.Body = binary.NewTeaCipher(c.WtSessionTicketKey).Decrypt(d) | ||
| default: | ||
| return nil, ErrUnknownEncryptType | ||
| } | ||
| return m, nil | ||
| } |
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