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package randutil
import (
crand "crypto/rand"
"encoding/binary"
"math/big"
)
// GenerateCryptoRandomString generates a random string for cryptographic usage.
func GenerateCryptoRandomString(n int, runes string) (string, error) {
letters := []rune(runes)
b := make([]rune, n)
for i := range b {
v, err := crand.Int(crand.Reader, big.NewInt(int64(len(letters))))
if err != nil {
return "", err
}
b[i] = letters[v.Int64()]
}
return string(b), nil
}
// CryptoUint64 returns cryptographic random uint64.
func CryptoUint64() (uint64, error) {
var v uint64
if err := binary.Read(crand.Reader, binary.LittleEndian, &v); err != nil {
return 0, err
}
return v, nil
}
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