48 lines
1.1 KiB
Go
48 lines
1.1 KiB
Go
package utils
|
|
|
|
import (
|
|
"fmt"
|
|
"hash/crc32"
|
|
rand2 "math/rand"
|
|
"time"
|
|
|
|
"github.com/google/uuid"
|
|
)
|
|
|
|
func GenUUID() string {
|
|
uuidHash := crc32.ChecksumIEEE([]byte(uuid.New().String()))
|
|
return fmt.Sprint(uuidHash)
|
|
}
|
|
|
|
func RandomNum() string {
|
|
return fmt.Sprintf("%08v", rand2.New(rand2.NewSource(time.Now().UnixNano())).Int31n(100000000))
|
|
}
|
|
|
|
const letterBytes = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
|
|
const (
|
|
letterIdxBits = 6 // 6 bits to represent a letter index
|
|
letterIdxMask = 1<<letterIdxBits - 1 // All 1-bits, as many as letterIdxBits
|
|
letterIdxMax = 63 / letterIdxBits // # of letter indices fitting in 63 bits
|
|
)
|
|
|
|
func GenerateDeviceSecret(n int) string {
|
|
b := make([]byte, n)
|
|
// A rand.Int63() generates 63 random bits, enough for letterIdxMax letters!
|
|
for i, cache, remain := n-1, rand2.Int63(), letterIdxMax; i >= 0; {
|
|
if remain == 0 {
|
|
cache, remain = rand2.Int63(), letterIdxMax
|
|
}
|
|
if idx := int(cache & letterIdxMask); idx < len(letterBytes) {
|
|
b[i] = letterBytes[idx]
|
|
i--
|
|
}
|
|
cache >>= letterIdxBits
|
|
remain--
|
|
}
|
|
return string(b)
|
|
}
|
|
|
|
func GenerateSaltKey() string {
|
|
return uuid.New().String()
|
|
}
|