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rand.go
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rand.go
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// SPDX-License-Identifier: BSD-3-Clause
// Copyright (c) 2024, Unikraft GmbH and The KraftKit Authors.
// Licensed under the BSD-3-Clause License (the "License").
// You may not use this file except in compliance with the License.
package vimport
import (
"crypto/rand"
"math/big"
"strings"
)
// genRandAuth generates a random authentication string.
func genRandAuth() (string, error) {
rndChars := []byte("0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz")
maxIdx := big.NewInt(int64(len(rndChars)))
const authLen = 32
var auth strings.Builder
auth.Grow(authLen)
var i *big.Int
var err error
for range authLen {
if i, err = rand.Int(rand.Reader, maxIdx); err != nil {
return "", err
}
if err = auth.WriteByte(rndChars[i.Int64()]); err != nil {
return "", err
}
}
return auth.String(), nil
}