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general.go
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general.go
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package utils
import (
crand "crypto/rand"
"encoding/base64"
"encoding/hex"
"math/rand"
"strconv"
"time"
"golang.org/x/crypto/curve25519"
)
func ClientIDtoReserved(clientID string) ([]int, string) {
decoded, err := base64.StdEncoding.DecodeString(clientID)
if err != nil {
panic(err)
}
hexString := hex.EncodeToString(decoded)
reserved := []int{}
for i := 0; i < len(hexString); i += 2 {
hexByte := hexString[i : i+2]
decValue, _ := strconv.ParseInt(hexByte, 16, 64)
reserved = append(reserved, int(decValue))
}
hexString = "0x" + hexString
return reserved, hexString
}
func RandStringRunes(n int, letterRunes []rune) string {
if n <= 0 {
return ""
}
if len(letterRunes) == 0 {
letterRunes = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789-_")
}
source := rand.NewSource(time.Now().UnixNano())
random := rand.New(source)
randomRunes := make([]rune, n)
for i := range randomRunes {
randomRunes[i] = letterRunes[random.Intn(len(letterRunes))]
}
return string(randomRunes)
}
func GenerateKey() (string, string, error) {
var priv, pub []byte
var err error
priv = make([]byte, curve25519.ScalarSize)
if _, err = crand.Read(priv); err != nil {
panic(err)
}
priv[0] &= 248
priv[31] &= 127 | 64
if pub, err = curve25519.X25519(priv, curve25519.Basepoint); err != nil {
panic(err)
}
return base64.StdEncoding.EncodeToString(priv[:]), base64.StdEncoding.EncodeToString(pub[:]), nil
}