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v2fly/proxy/vmess/protocol/user/idhash.go
2015-09-20 00:11:14 +02:00

52 lines
865 B
Go

package user
import (
"crypto/hmac"
"crypto/md5"
)
type CounterHash interface {
Hash(key []byte, counter int64) []byte
}
type StringHash interface {
Hash(key []byte, data []byte) []byte
}
type TimeHash struct {
baseHash StringHash
}
func NewTimeHash(baseHash StringHash) CounterHash {
return TimeHash{
baseHash: baseHash,
}
}
func (h TimeHash) Hash(key []byte, counter int64) []byte {
counterBytes := int64ToBytes(counter)
return h.baseHash.Hash(key, counterBytes)
}
type HMACHash struct {
}
func (h HMACHash) Hash(key []byte, data []byte) []byte {
hash := hmac.New(md5.New, key)
hash.Write(data)
return hash.Sum(nil)
}
func int64ToBytes(value int64) []byte {
return []byte{
byte(value >> 56),
byte(value >> 48),
byte(value >> 40),
byte(value >> 32),
byte(value >> 24),
byte(value >> 16),
byte(value >> 8),
byte(value),
}
}