go-scn/uuid.go

50 lines
854 B
Go
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2025-01-15 09:02:44 +01:00
package scn
import (
"crypto/rand"
"encoding/hex"
"io"
)
func mustHexUUID() string {
v, err := NewHexUUID()
if err != nil {
panic(err)
}
return v
}
func NewHexUUID() (string, error) {
uuid, err := NewUUID()
if err != nil {
return "", err
}
// Result: xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
var dst = make([]byte, 36)
hex.Encode(dst, uuid[:4])
dst[8] = '-'
hex.Encode(dst[9:13], uuid[4:6])
dst[13] = '-'
hex.Encode(dst[14:18], uuid[6:8])
dst[18] = '-'
hex.Encode(dst[19:23], uuid[8:10])
dst[23] = '-'
hex.Encode(dst[24:], uuid[10:])
return string(dst), nil
}
func NewUUID() ([16]byte, error) {
var uuid [16]byte
_, err := io.ReadFull(rand.Reader, uuid[:])
if err != nil {
return [16]byte{}, err
}
uuid[6] = (uuid[6] & 0x0f) | 0x40 // Version 4
uuid[8] = (uuid[8] & 0x3f) | 0x80 // Variant is 10
return uuid, nil
}