hotime/example/app/AES.go

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2022-05-05 08:07:01 +00:00
package app
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"encoding/base64"
"errors"
)
//高级加密标准Adevanced Encryption Standard ,AES
//16,24,32位字符串的话分别对应AES-128AES-192AES-256 加密方法
//key不能泄露
var PwdKey = []byte("mif022h3g9geAHUHY432,:da1adag389")
//PKCS7 填充模式
func pKCS7Padding(ciphertext []byte, blockSize int) []byte {
padding := blockSize - len(ciphertext)%blockSize
//Repeat()函数的功能是把切片[]byte{byte(padding)}复制padding个然后合并成新的字节切片返回
padtext := bytes.Repeat([]byte{byte(padding)}, padding)
return append(ciphertext, padtext...)
}
//填充的反向操作,删除填充字符串
func pKCS7UnPadding(origData []byte) ([]byte, error) {
//获取数据长度
length := len(origData)
if length == 0 {
return nil, errors.New("加密字符串错误!")
} else {
//获取填充字符串长度
unpadding := int(origData[length-1])
//截取切片,删除填充字节,并且返回明文
return origData[:(length - unpadding)], nil
}
}
//实现加密
func AesEcrypt(origData []byte, key []byte) ([]byte, error) {
//创建加密算法实例
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
//获取块的大小
blockSize := block.BlockSize()
//对数据进行填充,让数据长度满足需求
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))
//执行加密
blocMode.CryptBlocks(crypted, origData)
return crypted, nil
}
//实现解密
func AesDeCrypt(cypted []byte, key []byte) ([]byte, error) {
//创建加密算法实例
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
//获取块大小
blockSize := block.BlockSize()
//创建加密客户端实例
blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
origData := make([]byte, len(cypted))
//这个函数也可以用来解密
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
}
//执行AES解密
return AesDeCrypt(pwdByte, PwdKey)
}
//func main() {
// str := []byte("12fff我是ww.topgoer.com的站长枯藤")
// pwd, _ := EnPwdCode(str)
// bytes, _ := DePwdCode(pwd)
// fmt.Println(string(bytes))
//}