/
encrypt.go
165 lines (121 loc) · 3.14 KB
/
encrypt.go
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package datatype
import (
"database/sql/driver"
"fmt"
"math/big"
"strconv"
"strings"
)
type EncryptService interface {
Encode(value string) string
Decode(value string) string
Mask(value string) string
}
// 默认加密服务
type DefaultEncryptService struct{}
func (es DefaultEncryptService) Encode(value string) string {
var data []string
for _, pair := range RegexpSplit(`[0-9]{8,20}`, strings.ToUpper(value)) {
if pair.Match {
size := len(pair.Value)
ch := pair.Value[size-1:]
pair.Value = pair.Value[:size-1]
offset, _ := strconv.Atoi(ch)
if offset == 0 {
offset = 10
}
if offset%2 == 1 {
pair.Value = ReverseString(pair.Value)
}
v := big.NewInt(0)
v.SetString(pair.Value, 10)
pair.Value = ""
for _, c := range v.Text(16) {
i, _ := strconv.ParseInt(string(c), 16, 10)
pair.Value += fmt.Sprintf("%x", (i+int64(offset))%16)
}
pair.Value += ch
pair.Value += "!"
_size := len(pair.Value)
if _size < size {
pair.Value = pair.Value[:_size/2] + strings.Repeat("*", size-_size) + pair.Value[_size/2:]
}
}
data = append(data, pair.Value)
}
return strings.Join(data, "")
}
func (es DefaultEncryptService) Decode(value string) string {
var data []string
for _, pair := range RegexpSplit(`[0-9a-f*]{6,18}[0-9]!`, value) {
if pair.Match {
size := len(pair.Value) - 1
pair.Value = strings.ReplaceAll(strings.ReplaceAll(pair.Value, "*", ""), "!", "")
_size := len(pair.Value)
ch := pair.Value[_size-1:]
pair.Value = pair.Value[:_size-1]
offset, _ := strconv.Atoi(ch)
if offset == 0 {
offset = 10
}
value := pair.Value
pair.Value = ""
for _, c := range value {
i, _ := strconv.ParseInt(string(c), 16, 10)
pair.Value += fmt.Sprintf("%x", (i-int64(offset)+16)%16)
}
v := big.NewInt(0)
v.SetString(pair.Value, 16)
pair.Value = v.String()
if len(pair.Value) < size {
pair.Value = strings.Repeat("0", size-len(pair.Value)) + pair.Value
}
if offset%2 == 1 {
pair.Value = ReverseString(pair.Value)
}
pair.Value += ch
}
data = append(data, pair.Value)
}
return strings.Join(data, "")
}
func (es DefaultEncryptService) Mask(value string) string {
var data []string
for _, pair := range RegexpSplit(`[0-9]{8,20}`, value) {
if pair.Match {
size := len(pair.Value)
if size >= 10 {
pair.Value = pair.Value[:4] + strings.Repeat("*", size-8) + pair.Value[size-4:]
} else {
pair.Value = pair.Value[:3] + strings.Repeat("*", size-6) + pair.Value[size-3:]
}
}
data = append(data, pair.Value)
}
return strings.Join(data, "")
}
type EncryptConfig struct {
// 加密服务
Service EncryptService
}
var EncryptOptions = EncryptConfig{
Service: DefaultEncryptService{},
}
type Encrypt string
// GORM
func (e *Encrypt) Scan(value any) error {
if v, ok := value.(string); ok {
*e = Encrypt(EncryptOptions.Service.Decode(v))
}
return nil
}
func (e Encrypt) Value() (driver.Value, error) {
return EncryptOptions.Service.Encode(string(e)), nil
}
func (e Encrypt) Mask() string {
return EncryptOptions.Service.Mask(string(e))
}
// String
func (e Encrypt) String() string {
return e.Mask()
}