78 lines
2.1 KiB
Go
78 lines
2.1 KiB
Go
package aes
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import (
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"bytes"
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"crypto/aes"
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"crypto/cipher"
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"errors"
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)
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//高级加密标准（Adevanced Encryption Standard ,AES）
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//16,24,32位字符串的话，分别对应AES-128，AES-192，AES-256 加密方法
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//key不能泄露
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var PwdKey = []byte("tyfon918tyfon918")
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//PKCS7 填充模式
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func PKCS7Padding(ciphertext []byte, blockSize int) []byte {
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padding := blockSize - len(ciphertext)%blockSize
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//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
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padtext := bytes.Repeat([]byte{byte(padding)}, padding)
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return append(ciphertext, padtext...)
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}
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//填充的反向操作，删除填充字符串
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func PKCS7UnPadding(origData []byte) ([]byte, error) {
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//获取数据长度
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length := len(origData)
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if length == 0 {
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return nil, errors.New("加密字符串错误！")
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} else {
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//获取填充字符串长度
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unpadding := int(origData[length-1])
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//截取切片，删除填充字节，并且返回明文
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return origData[:(length - unpadding)], nil
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}
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}
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//实现加密
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func AesEcrypt(origData []byte, key []byte) ([]byte, error) {
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//创建加密算法实例
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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//获取块的大小
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blockSize := block.BlockSize()
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//对数据进行填充，让数据长度满足需求
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origData = PKCS7Padding(origData, blockSize)
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//采用AES加密方法中CBC加密模式
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blocMode := cipher.NewCBCEncrypter(block, key[:blockSize])
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crypted := make([]byte, len(origData))
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//执行加密
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blocMode.CryptBlocks(crypted, origData)
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return crypted, nil
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}
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//实现解密
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func AesDeCrypt(cypted []byte, key []byte) ([]byte, error) {
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//创建加密算法实例
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block, err := aes.NewCipher(key)
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if err != nil {
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return nil, err
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}
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//获取块大小
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blockSize := block.BlockSize()
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//创建加密客户端实例
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blockMode := cipher.NewCBCDecrypter(block, key[:blockSize])
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origData := make([]byte, len(cypted))
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//这个函数也可以用来解密
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blockMode.CryptBlocks(origData, cypted)
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//去除填充字符串
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origData, err = PKCS7UnPadding(origData)
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if err != nil {
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return nil, err
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}
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return origData, err
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}
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