golang 加密解密
golang 加密解密
package main import ( "bytes" "crypto/aes" "crypto/cipher" "encoding/base64" "errors" "fmt" ) //高级加密标准(Adevanced Encryption Standard ,AES) //16,24,32位字符串的话,分别对应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)) }
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