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package protocol
import (
"crypto/hmac"
"crypto/md5"
"hash"
"v2ray.com/core/common"
"v2ray.com/core/common/uuid"
)
const (
IDBytesLen = 16
)
type IDHash func(key []byte) hash.Hash
func DefaultIDHash(key []byte) hash.Hash {
return hmac.New(md5.New, key)
}
// The ID of en entity, in the form of a UUID.
type ID struct {
uuid uuid.UUID
cmdKey [IDBytesLen]byte
}
// Equals returns true if this ID equals to the other one.
func (id *ID) Equals(another *ID) bool {
return id.uuid.Equals(&(another.uuid))
}
func (id *ID) Bytes() []byte {
return id.uuid.Bytes()
}
func (id *ID) String() string {
return id.uuid.String()
}
func (id *ID) UUID() uuid.UUID {
return id.uuid
}
func (id ID) CmdKey() []byte {
return id.cmdKey[:]
}
// NewID returns an ID with given UUID.
func NewID(uuid uuid.UUID) *ID {
id := &ID{uuid: uuid}
md5hash := md5.New()
common.Must2(md5hash.Write(uuid.Bytes()))
common.Must2(md5hash.Write([]byte("c48619fe-8f02-49e0-b9e9-edf763e17e21")))
md5hash.Sum(id.cmdKey[:0])
return id
}
func nextID(u *uuid.UUID) uuid.UUID {
md5hash := md5.New()
common.Must2(md5hash.Write(u.Bytes()))
common.Must2(md5hash.Write([]byte("16167dc8-16b6-4e6d-b8bb-65dd68113a81")))
var newid uuid.UUID
for {
md5hash.Sum(newid[:0])
if !newid.Equals(u) {
return newid
}
common.Must2(md5hash.Write([]byte("533eff8a-4113-4b10-b5ce-0f5d76b98cd2")))
}
}
func NewAlterIDs(primary *ID, alterIDCount uint16) []*ID {
alterIDs := make([]*ID, alterIDCount)
prevID := primary.UUID()
for idx := range alterIDs {
newid := nextID(&prevID)
alterIDs[idx] = NewID(newid)
prevID = newid
}
return alterIDs
}
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