github.com/xxf098/lite-proxy@v0.15.1-0.20230422081941-12c69f323218/transport/vmess/user.go (about)

     1  package vmess
     2  
     3  import (
     4  	"bytes"
     5  	"crypto/md5"
     6  
     7  	"github.com/gofrs/uuid"
     8  )
     9  
    10  // ID cmdKey length
    11  const (
    12  	IDBytesLen = 16
    13  )
    14  
    15  // The ID of en entity, in the form of a UUID.
    16  type ID struct {
    17  	UUID   *uuid.UUID
    18  	CmdKey []byte
    19  }
    20  
    21  // newID returns an ID with given UUID.
    22  func newID(uuid *uuid.UUID) *ID {
    23  	id := &ID{UUID: uuid, CmdKey: make([]byte, IDBytesLen)}
    24  	md5hash := md5.New()
    25  	md5hash.Write(uuid.Bytes())
    26  	md5hash.Write([]byte("c48619fe-8f02-49e0-b9e9-edf763e17e21"))
    27  	md5hash.Sum(id.CmdKey[:0])
    28  	return id
    29  }
    30  
    31  func nextID(u *uuid.UUID) *uuid.UUID {
    32  	md5hash := md5.New()
    33  	md5hash.Write(u.Bytes())
    34  	md5hash.Write([]byte("16167dc8-16b6-4e6d-b8bb-65dd68113a81"))
    35  	var newid uuid.UUID
    36  	for {
    37  		md5hash.Sum(newid[:0])
    38  		if !bytes.Equal(newid.Bytes(), u.Bytes()) {
    39  			return &newid
    40  		}
    41  		md5hash.Write([]byte("533eff8a-4113-4b10-b5ce-0f5d76b98cd2"))
    42  	}
    43  }
    44  
    45  func newAlterIDs(primary *ID, alterIDCount uint16) []*ID {
    46  	alterIDs := make([]*ID, alterIDCount)
    47  	prevID := primary.UUID
    48  	for idx := range alterIDs {
    49  		newid := nextID(prevID)
    50  		alterIDs[idx] = &ID{UUID: newid, CmdKey: primary.CmdKey[:]}
    51  		prevID = newid
    52  	}
    53  	alterIDs = append(alterIDs, primary)
    54  	return alterIDs
    55  }