/
aes.go
78 lines (71 loc) · 1.78 KB
/
aes.go
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package crypto
import (
"bytes"
"crypto/aes"
"crypto/cipher"
"encoding/hex"
"errors"
)
// PKCS7 填充模式
func pKCS7Padding(data []byte, blockSize int) []byte {
padding := blockSize - len(data)%blockSize
latest := bytes.Repeat([]byte{byte(padding)}, padding)
return append(data, latest...)
}
// 填充的反向操作,删除填充字符串
func pKCS7UnPadding(data []byte) ([]byte, error) {
length := len(data)
if length == 0 {
return nil, errors.New("data is empty")
} else {
padding := int(data[length-1])
return data[:(length - padding)], nil
}
}
// aesEncrypt 加密
func aesEncrypt(data []byte, key []byte) ([]byte, error) {
block, err := aes.NewCipher(key)
if err != nil {
return nil, err
}
blockSize := block.BlockSize()
data = pKCS7Padding(data, blockSize)
blocMode := cipher.NewCBCEncrypter(block, key[:blockSize])
encrypted := make([]byte, len(data))
blocMode.CryptBlocks(encrypted, data)
return encrypted, nil
}
// aesDeCrypt 实现解密
func aesDeCrypt(data []byte, key []byte) (string, error) {
//创建加密算法实例
block, err := aes.NewCipher(key)
if err != nil {
return "", err
}
blockSize := block.BlockSize()
blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
origData := make([]byte, len(data))
blockMode.CryptBlocks(origData, data)
origData, err = pKCS7UnPadding(origData)
if err != nil {
return "", err
}
return string(origData), err
}
// EnCrypt 加密
func EnCrypt(str, key string) (string, error) {
result, err := aesEncrypt([]byte(str), []byte(key))
if err != nil {
return "", err
}
return hex.EncodeToString(result), nil
}
// DeCrypt 解密
func DeCrypt(str, key string) (string, error) {
temp, _ := hex.DecodeString(str)
res, err := aesDeCrypt(temp, []byte(key))
if err != nil {
return "", err
}
return res, nil
}