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v2fly/vid.go

49 lines
824 B
Go

package core
import (
"crypto/md5"
"encoding/hex"
"fmt"
)
// The ID of en entity, in the form of an UUID.
type VID [16]byte
// Hash generates a MD5 hash based on current VID and a suffix string.
func (v VID) Hash(suffix []byte) []byte {
md5 := md5.New()
md5.Write(v[:])
md5.Write(suffix)
return md5.Sum(nil)
}
var byteGroups = []int{8, 4, 4, 4, 12}
// TODO: leverage a full functional UUID library
func UUIDToVID(uuid string) (v VID, err error) {
text := []byte(uuid)
if len(text) < 32 {
err = fmt.Errorf("uuid: invalid UUID string: %s", text)
return
}
b := v[:]
for _, byteGroup := range byteGroups {
if text[0] == '-' {
text = text[1:]
}
_, err = hex.Decode(b[:byteGroup/2], text[:byteGroup])
if err != nil {
return
}
text = text[byteGroup:]
b = b[byteGroup/2:]
}
return
}