38 lines
779 B
Go
38 lines
779 B
Go
package encrypt
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import (
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"math/rand"
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"unsafe"
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)
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const lettersString = "0123456789abcdefghijkmnpqrstuvwxyzABCDEFGHJKLMNPQRSTUVWXYZ"
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// 字符串长度
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const number = 16
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/*
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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
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*/
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func LotteryEncryptEncode() string {
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b := make([]byte, number)
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var sum byte
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for i := 0; i < number-1; i++ {
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b[i] = lettersString[rand.Int63()%int64(len(lettersString))]
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sum += b[i]
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}
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b[number-1] = lettersString[sum%byte(len(lettersString))]
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return *(*string)(unsafe.Pointer(&b))
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}
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func LotteryEncryptDecode(str string) bool {
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var sum byte
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for i := 0; i < len(str)-1; i++ {
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sum += str[i]
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}
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if lettersString[sum%byte(len(lettersString))] != str[len(str)-1] {
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return false
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}
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return true
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}
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