// Try PEM
	if block, _ := pem.Decode(priv); block != nil {
		return x509.ParsePKCS1PrivateKey(block.Bytes)
	}
	// Try base 64
	dst := make([]byte, base64.StdEncoding.DecodedLen(len(priv)))
	if n, err := base64.StdEncoding.Decode(dst, priv); err == nil {
		return x509.ParsePKCS1PrivateKey(dst[:n])
	}
	// Try Raw, return error
	return x509.ParsePKCS1PrivateKey(priv)
}

	}
	if length <= 0 {
		length = secretKeyMaxLen
	}
	if length < secretKeyMinLen {
		return "", errors.New("auth: secret key length is too short")
	}

	key := make([]byte, base64.RawStdEncoding.DecodedLen(length))
	if _, err := io.ReadFull(random, key); err != nil {
		return "", err
	}

	s := base64.RawStdEncoding.EncodeToString(key)
	return strings.ReplaceAll(s, "/", "+"), nil
}