package protocol
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import (
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"crypto/hmac"
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"crypto/md5"
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"hash"
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"github.com/v2fly/v2ray-core/v5/common"
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"github.com/v2fly/v2ray-core/v5/common/uuid"
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)
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const (
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IDBytesLen = 16
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)
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type IDHash func(key []byte) hash.Hash
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func DefaultIDHash(key []byte) hash.Hash {
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return hmac.New(md5.New, key)
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}
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// The ID of en entity, in the form of a UUID.
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type ID struct {
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uuid uuid.UUID
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cmdKey [IDBytesLen]byte
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}
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// Equals returns true if this ID equals to the other one.
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func (id *ID) Equals(another *ID) bool {
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return id.uuid.Equals(&(another.uuid))
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}
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func (id *ID) Bytes() []byte {
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return id.uuid.Bytes()
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}
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func (id *ID) String() string {
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return id.uuid.String()
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}
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func (id *ID) UUID() uuid.UUID {
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return id.uuid
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}
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func (id ID) CmdKey() []byte {
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return id.cmdKey[:]
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}
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// NewID returns an ID with given UUID.
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func NewID(uuid uuid.UUID) *ID {
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id := &ID{uuid: uuid}
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md5hash := md5.New()
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common.Must2(md5hash.Write(uuid.Bytes()))
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common.Must2(md5hash.Write([]byte("c48619fe-8f02-49e0-b9e9-edf763e17e21")))
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md5hash.Sum(id.cmdKey[:0])
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return id
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}
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func nextID(u *uuid.UUID) uuid.UUID {
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md5hash := md5.New()
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common.Must2(md5hash.Write(u.Bytes()))
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common.Must2(md5hash.Write([]byte("16167dc8-16b6-4e6d-b8bb-65dd68113a81")))
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var newid uuid.UUID
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for {
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md5hash.Sum(newid[:0])
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if !newid.Equals(u) {
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return newid
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}
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common.Must2(md5hash.Write([]byte("533eff8a-4113-4b10-b5ce-0f5d76b98cd2")))
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}
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}
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func NewAlterIDs(primary *ID, alterIDCount uint16) []*ID {
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alterIDs := make([]*ID, alterIDCount)
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prevID := primary.UUID()
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for idx := range alterIDs {
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newid := nextID(&prevID)
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alterIDs[idx] = NewID(newid)
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prevID = newid
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}
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return alterIDs
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}
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