duoduo/tools/aes.go

package tools

import (
	"bytes"
	"crypto/aes"
	"crypto/cipher"
	"encoding/base64"
	"errors"
)

// AES 加密
func AesEncrypt(orig string, _Aeskey string) (string, error) {

	origData := []byte(orig)
	key := []byte(_Aeskey)

	block, err := aes.NewCipher(key)
	if err != nil {
		return "", err
	}

	blockSize := block.BlockSize()
	origData = func(ciphertext []byte, blockSize int) []byte {
		padding := blockSize - len(ciphertext)%blockSize
		padtext := bytes.Repeat([]byte{byte(padding)}, padding)
		return append(ciphertext, padtext...)
	}(origData, blockSize)
	blockMode := cipher.NewCBCEncrypter(block, key[:blockSize])
	crypted := make([]byte, len(origData))
	blockMode.CryptBlocks(crypted, origData)
	return base64.StdEncoding.EncodeToString(crypted), nil
}

// AES 解密
func AesDecrypt(cryted string, _Aeskey string) (string, error) {

	if cryted == "" {
		return "", errors.New("错误的数据")
	}

	crypted, err := base64.StdEncoding.DecodeString(cryted)
	if err != nil {
		return "", err
	}
	key := []byte(_Aeskey)

	block, err := aes.NewCipher(key)
	if err != nil {
		return "", err
	}

	blockSize := block.BlockSize()
	blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
	origData := make([]byte, len(crypted))
	blockMode.CryptBlocks(origData, crypted)
	origData = func(origData []byte) []byte {
		length := len(origData)
		unpadding := int(origData[length-1])
		return origData[:(length - unpadding)]
	}(origData)
	return string(origData[:]), nil
}