38 lines
779 B
Go
38 lines
779 B
Go
|
package encrypt
|
|||
|
|
|
|||
|
|
import (
|
|||
|
|
"math/rand"
|
|||
|
|
"unsafe"
|
|||
|
|
)
|
|||
|
|
|
|||
|
|
const lettersString = "0123456789abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ"
|
|||
|
|
|
|||
|
|
// 字符串长度
|
|||
|
|
const number = 16
|
|||
|
|
|
|||
|
|
/*
|
|||
|
|
16位码，前15位随机字符串，最后一位通过前15位字符串计算校验生成
|
|||
|
|
*/
|
|||
|
|
|
|||
|
|
func LotteryEncryptEncode() string {
|
|||
|
|
b := make([]byte, number)
|
|||
|
|
var sum byte
|
|||
|
|
for i := 0; i < number-1; i++ {
|
|||
|
|
b[i] = lettersString[rand.Int63()%int64(len(lettersString))]
|
|||
|
|
sum += b[i]
|
|||
|
|
}
|
|||
|
|
b[number-1] = lettersString[sum%byte(len(lettersString))]
|
|||
|
|
return *(*string)(unsafe.Pointer(&b))
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
func LotteryEncryptDecode(str string) bool {
|
|||
|
|
var sum byte
|
|||
|
|
for i := 0; i < len(str)-1; i++ {
|
|||
|
|
sum += str[i]
|
|||
|
|
}
|
|||
|
|
if lettersString[sum%byte(len(lettersString))] != str[len(str)-1] {
|
|||
|
|
return false
|
|||
|
|
}
|
|||
|
|
return true
|
|||
|
|
}
|