package internal

import (
	"errors"
	"time"
)

const (
	MinEntropyInputLength = 256 >> 3       // 最小熵阈值256比特
	MaxEntropyInputLength = (1 << 35) >> 3 // 最大熵阈值2^35比特

)

// 可能返回的错误
var (
	ErrNeedReseed          = errors.New("[drng] - need reseed")
	ErrReturnedBitsTooLong = errors.New("[drng] - requested number of bits too long")
	ErrEntropyLength       = errors.New("[drng] - entropy length too short or too long")
)

// 安全级别
type SecureLevel uint

const (
	SecureLevel1 SecureLevel = 1 + iota
	SecureLevel2
)

type DrngConfig struct {
	Seedlen                 int
	Outlen                  int
	ReseedIntervalInTime    time.Duration // 重播种时间阈值
	ReseedIntervalInCounter int           // 重播种计数器阈值
	MinEntropy              int64
	MinEntropyInputLength   int64
	MaxEntropyInputLength   int64
}