172 lines
3.7 KiB
Go
172 lines
3.7 KiB
Go
package mtwmapi
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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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"crypto/rand"
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"encoding/base64"
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"errors"
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"io"
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"log"
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"sync"
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)
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//ip配置信息
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type global struct {
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LocalHost string //本机内网IP
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RemoteHost string //远程端IP
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RemotePort string //远程端口
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ServerList map[string]string
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ServerListLock sync.RWMutex
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}
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type commonConf struct {
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HttpPort string
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RPCPort string
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Cluster bool
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CryptoKey string
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}
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var (
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GlobalSetting = &global{}
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CommonSetting = &commonConf{
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HttpPort: "6000",
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RPCPort: "7000",
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Cluster: false,
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CryptoKey: "Adba723b7fe06819",
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}
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)
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/*
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以下为clientID相关逻辑
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*/
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//对称加密IP和端口，当做clientId
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func GenClientId() string {
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raw := []byte(GlobalSetting.LocalHost + ":" + CommonSetting.RPCPort)
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//raw := []byte(hostStr)
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str, err := Encrypt(raw, []byte(CommonSetting.CryptoKey))
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if err != nil {
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log.Fatal(err)
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}
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return str
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}
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func Encrypt(rawData, key []byte) (string, error) {
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data, err := aesCBCEncrypt(rawData, key)
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if err != nil {
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return "", err
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}
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return base64.StdEncoding.EncodeToString(data), nil
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}
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//AES加密
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func aesCBCEncrypt(rawData, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return []byte{}, err
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}
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//填充原文
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blockSize := block.BlockSize()
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rawData = pKCS7Padding(rawData, blockSize)
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//初始向量IV必须是唯一，但不需要保密
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cipherText := make([]byte, blockSize+len(rawData))
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//block大小 16
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iv := cipherText[:blockSize]
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if _, err := io.ReadFull(rand.Reader, iv); err != nil {
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return []byte{}, err
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}
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//block大小和初始向量大小一定要一致
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mode := cipher.NewCBCEncrypter(block, iv)
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mode.CryptBlocks(cipherText[blockSize:], rawData)
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return cipherText, nil
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}
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func DecryptDESECB(d, key []byte) string {
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data, err := base64.StdEncoding.DecodeString(string(d))
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if err != nil {
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return ""
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}
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block, err := aes.NewCipher(key)
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if err != nil {
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return ""
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}
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bs := block.BlockSize()
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if len(data)%bs != 0 {
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return ""
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}
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out := make([]byte, len(data))
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dst := out
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for len(data) > 0 {
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block.Decrypt(dst, data[:bs])
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data = data[bs:]
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dst = dst[bs:]
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}
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out = PKCS5UnPadding(out)
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return string(out)
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}
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func PKCS5UnPadding(origData []byte) []byte {
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length := len(origData)
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unpadding := int(origData[length-1])
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return origData[:(length - unpadding)]
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}
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func Decrypt(rawData string, key []byte) (string, error) {
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data, err := base64.StdEncoding.DecodeString(rawData)
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if err != nil {
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return "", err
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}
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dnData, err := aesCBCDncrypt(data, key)
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if err != nil {
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return "", err
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}
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return string(dnData), nil
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}
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//AES解密
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func aesCBCDncrypt(encryptData, key []byte) ([]byte, error) {
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block, err := aes.NewCipher(key)
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if err != nil {
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return []byte{}, err
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}
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blockSize := block.BlockSize()
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if len(encryptData) < blockSize {
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return []byte{}, errors.New("ciphertext too short")
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}
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iv := encryptData[:blockSize]
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encryptData = encryptData[blockSize:]
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if len(encryptData)%blockSize != 0 {
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return []byte{}, errors.New("ciphertext is not a multiple of the block size")
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}
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mode := cipher.NewCBCDecrypter(block, iv)
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mode.CryptBlocks(encryptData, encryptData)
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//解填充
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encryptData, err = pKCS7UnPadding(encryptData)
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return encryptData, err
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}
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func pKCS7Padding(ciphertext []byte, blockSize int) []byte {
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padding := blockSize - len(ciphertext)%blockSize
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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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func pKCS7UnPadding(origData []byte) ([]byte, error) {
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length := len(origData)
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unPadding := int(origData[length-1])
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if length-unPadding < 0 || length-unPadding > len(origData) {
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return nil, errors.New("unPadding error")
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}
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return origData[:(length - unPadding)], nil
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}
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