golang使用aes库实现加解密操作

package main
import (
 "fmt"
 "crypto/cipher"
 "crypto/aes"
 "bytes"
 "encoding/base64"
)
func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
 padding := blockSize - len(ciphertext)%blockSize
 padtext := bytes.Repeat([]byte{byte(padding)}, padding)
 return append(ciphertext, padtext...)
}
func PKCS5UnPadding(origData []byte) []byte {
 length := len(origData)
 unpadding := int(origData[length-1])
 return origData[:(length - unpadding)]
}
func AesEncrypt(origData, key []byte) ([]byte, error) {
 block, err := aes.NewCipher(key)
 if err != nil {
  return nil, err
 }
 blockSize := block.BlockSize()
 origData = PKCS5Padding(origData, blockSize)
 blockMode := cipher.NewCBCEncrypter(block, key[:blockSize])
 crypted := make([]byte, len(origData))
 blockMode.CryptBlocks(crypted, origData)
 return crypted, nil
}
func AesDecrypt(crypted, key []byte) ([]byte, error) {
 block, err := aes.NewCipher(key)
 if err != nil {
  return nil, err
 }
 blockSize := block.BlockSize()
 blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
 origData := make([]byte, len(crypted))
 blockMode.CryptBlocks(origData, crypted)
 origData = PKCS5UnPadding(origData)
 return origData, nil
}
func main() {
 var aeskey = []byte("321423u9y8d2fwfl")
 pass := []byte("vdncloud123456")
 xpass, err := AesEncrypt(pass, aeskey)
 if err != nil {
  fmt.Println(err)
  return
 }
 pass64 := base64.StdEncoding.EncodeToString(xpass)
 fmt.Printf("加密后:%v\n",pass64)
 bytesPass, err := base64.StdEncoding.DecodeString(pass64)
 if err != nil {
  fmt.Println(err)
  return
 }
 tpass, err := AesDecrypt(bytesPass, aeskey)
 if err != nil {
  fmt.Println(err)
  return
 }
 fmt.Printf("解密后:%s\n", tpass)
}

package main
import (
 "bytes"
 "crypto/aes"
 "crypto/cipher"
 "encoding/base64"
 "fmt"
)
const (
 key = "2018201820182018"
 iv = "1234567887654321"
)
func main() {
 str := "我勒个去"
 es, _ := AesEncrypt(str, []byte(key))
 fmt.Println(es)
 ds, _ := AesDecrypt(es, []byte(key))
 fmt.Println(string(ds))
}
func AesEncrypt(encodeStr string, key []byte) (string, error) {
 encodeBytes := []byte(encodeStr)
 //根据key 生成密文
 block, err := aes.NewCipher(key)
 if err != nil {
  return "", err
 }
 blockSize := block.BlockSize()
 encodeBytes = PKCS5Padding(encodeBytes, blockSize)
 blockMode := cipher.NewCBCEncrypter(block, []byte(iv))
 crypted := make([]byte, len(encodeBytes))
 blockMode.CryptBlocks(crypted, encodeBytes)
 return base64.StdEncoding.EncodeToString(crypted), nil
}
func PKCS5Padding(ciphertext []byte, blockSize int) []byte {
 padding := blockSize - len(ciphertext)%blockSize
 //填充
 padtext := bytes.Repeat([]byte{byte(padding)}, padding)
 return append(ciphertext, padtext...)
}
func AesDecrypt(decodeStr string, key []byte) ([]byte, error) {
 //先解密base64
 decodeBytes, err := base64.StdEncoding.DecodeString(decodeStr)
 if err != nil {
  return nil, err
 }
 block, err := aes.NewCipher(key)
 if err != nil {
  return nil, err
 }
 blockMode := cipher.NewCBCDecrypter(block, []byte(iv))
 origData := make([]byte, len(decodeBytes))
 blockMode.CryptBlocks(origData, decodeBytes)
 origData = PKCS5UnPadding(origData)
 return origData, nil
}
func PKCS5UnPadding(origData []byte) []byte {
 length := len(origData)
 unpadding := int(origData[length-1])
 return origData[:(length - unpadding)]
}