## 常用加密
### 密碼加密
```go
package main
import (
"errors"
"fmt"
"github.com/prometheus/common/log"
"golang.org/x/crypto/bcrypt"
)
//GeneratePassword 加密明文密碼
func GeneratePassword(pwd string) (string, error) {
encryptedPwd, err := bcrypt.GenerateFromPassword([]byte(pwd), bcrypt.DefaultCost)
return string(encryptedPwd), err
}
//ValidatePassword 驗證密碼
// pwd 明文密碼
// encryptedPwd 加密的密碼
func ValidatePassword(pwd string, encryptedPwd string) (bool, error) {
if err := bcrypt.CompareHashAndPassword([]byte(encryptedPwd), []byte(pwd)); err != nil {
return false, errors.New("wrong password")
}
return true, nil
}
func main() {
p := "123456"
pwd, err := GeneratePassword(p)
if err != nil {
log.Error(err)
}
fmt.Println("ciphertext:", pwd)
isOk, _ := ValidatePassword(p, pwd)
if !isOk {
log.Error(err)
}
fmt.Println(isOk)
}
```
打印結果
```bash
ciphertext: $2a$10$mGB.ml/M/2A..NgIrFSk1ekl0Qi3gIvfk3n0sOFTje9ScZtxxpLfG
true
```
### MD5
```go
package main
import (
"crypto/md5"
"fmt"
"io"
)
func Md5(str string) string {
h := md5.New()
_, _ = io.WriteString(h, str)
return fmt.Sprintf("%x", h.Sum(nil))
}
func main() {
fmt.Println(Md5("123456"))
}
```
打印結果
```bash
e10adc3949ba59abbe56e057f20f883e
```
### SHA
```go
package main
import (
"crypto/sha1"
"crypto/sha256"
"fmt"
"io"
)
func SHA1(str string) string {
h := sha1.New()
_, _ = io.WriteString(h, str)
return fmt.Sprintf("%x", h.Sum(nil))
}
func SHA2(str string) string {
h := sha256.New()
_, _ = io.WriteString(h, str)
return fmt.Sprintf("%x", h.Sum(nil))
}
func main() {
msg := "https://golang.org"
fmt.Println(SHA1(msg))
fmt.Println(SHA2(msg))
}
```
打印結果
```bash
0a95b510a2e68b88ebc9bc09e76f7dbcfa1eb90e
bfd04cc20536303bd2c62bad327217f5c94f96578a5e95ca495f1d46c113016b
```
### BASE64
```go
package main
import (
"encoding/base64"
"fmt"
)
func Base64Encode(str string) string {
encoded := base64.StdEncoding.EncodeToString([]byte(str))
return encoded
}
func Base64Decode(str string) (string, error) {
decoded, err := base64.StdEncoding.DecodeString(str)
if err != nil {
return "", err
}
return string(decoded), nil
}
func main() {
msg := "https://golang.org"
fmt.Println(Base64Encode(msg))
fmt.Println(Base64Decode("aHR0cHM6Ly9nb2xhbmcub3Jn"))
}
```
### AES加解密
```go
package main
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"encoding/base64"
"errors"
"fmt"
)
//高級加密標準（Adevanced Encryption Standard ,AES）
//16,24,32位字符串的話，分別對應AES-128，AES-192，AES-256 加密方法
//key不能泄露
var PwdKey = []byte("DIS**#KKKDJJSKDI")
//PKCS7 填充模式
func PKCS7Padding(ciphertext []byte, blockSize int) []byte {
padding := blockSize - len(ciphertext)%blockSize
//Repeat()函數的功能是把切片[]byte{byte(padding)}復制padding個，然后合并成新的字節切片返回
padtext := bytes.Repeat([]byte{byte(padding)}, padding)
return append(ciphertext, padtext...)
}
//填充的反向操作，刪除填充字符串
func PKCS7UnPadding(origData []byte) ([]byte, error) {
//獲取數據長度
length := len(origData)
if length == 0 {
return nil, errors.New("加密字符串錯誤！")
} else {
//獲取填充字符串長度
unpadding := int(origData[length-1])
//截取切片，刪除填充字節，并且返回明文
return origData[:(length - unpadding)], nil
}
}
//實現加密
func AesEcrypt(origData []byte, key []byte) ([]byte, error) {
//創建加密算法實例
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
//獲取塊的大小
blockSize := block.BlockSize()
//對數據進行填充，讓數據長度滿足需求
origData = PKCS7Padding(origData, blockSize)
//采用AES加密方法中CBC加密模式
blocMode := cipher.NewCBCEncrypter(block, key[:blockSize])
crypted := make([]byte, len(origData))
//執行加密
blocMode.CryptBlocks(crypted, origData)
return crypted, nil
}
//實現解密
func AesDeCrypt(cypted []byte, key []byte) ([]byte, error) {
//創建加密算法實例
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
//獲取塊大小
blockSize := block.BlockSize()
//創建加密客戶端實例
blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
origData := make([]byte, len(cypted))
//這個函數也可以用來解密
blockMode.CryptBlocks(origData, cypted)
//去除填充字符串
origData, err = PKCS7UnPadding(origData)
if err != nil {
return nil, err
}
return origData, err
}
//加密base64
func EnPwdCode(pwd []byte) (string, error) {
result, err := AesEcrypt(pwd, PwdKey)
if err != nil {
return "", err
}
return base64.StdEncoding.EncodeToString(result), err
}
//解密
func DePwdCode(pwd string) ([]byte, error) {
//解密base64字符串
pwdByte, err := base64.StdEncoding.DecodeString(pwd)
if err != nil {
return nil, err
}
//執行AES解密
return AesDeCrypt(pwdByte, PwdKey)
}
func main() {
str := []byte("12fff我是ww.topgoer.com的站長枯藤")
pwd, _ := EnPwdCode(str)
bytes, _ := DePwdCode(pwd)
fmt.Println(string(bytes))
}
```
