You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
66 lines
1.4 KiB
66 lines
1.4 KiB
package mw
|
|
|
|
import (
|
|
"crypto/aes"
|
|
"crypto/cipher"
|
|
"crypto/md5"
|
|
"encoding/base64"
|
|
"errors"
|
|
"fmt"
|
|
"github.com/OpenIMSDK/Open-IM-Server/pkg/common/config"
|
|
"math/rand"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
var (
|
|
once sync.Once
|
|
block cipher.Block
|
|
)
|
|
|
|
func init() {
|
|
rand.Seed(time.Now().UnixNano())
|
|
}
|
|
|
|
func initAesKey() {
|
|
once.Do(func() {
|
|
key := md5.Sum([]byte("openim:" + config.Config.Secret))
|
|
var err error
|
|
block, err = aes.NewCipher(key[:])
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
})
|
|
}
|
|
|
|
func genReqKey(args []string) string {
|
|
initAesKey()
|
|
plaintext := md5.Sum([]byte(strings.Join(args, ":")))
|
|
iv := make([]byte, aes.BlockSize, aes.BlockSize+md5.Size)
|
|
if _, err := rand.Read(iv); err != nil {
|
|
panic(err)
|
|
}
|
|
ciphertext := make([]byte, md5.Size)
|
|
cipher.NewCBCEncrypter(block, iv).CryptBlocks(ciphertext, plaintext[:])
|
|
return base64.StdEncoding.EncodeToString(append(iv, ciphertext...))
|
|
}
|
|
|
|
func verifyReqKey(args []string, key string) error {
|
|
initAesKey()
|
|
k, err := base64.StdEncoding.DecodeString(key)
|
|
if err != nil {
|
|
return fmt.Errorf("invalid key %v", err)
|
|
}
|
|
if len(k) != aes.BlockSize+md5.Size {
|
|
return errors.New("invalid key")
|
|
}
|
|
plaintext := make([]byte, md5.Size)
|
|
cipher.NewCBCDecrypter(block, k[:aes.BlockSize]).CryptBlocks(plaintext, k[aes.BlockSize:])
|
|
sum := md5.Sum([]byte(strings.Join(args, ":")))
|
|
if string(plaintext) != string(sum[:]) {
|
|
return errors.New("mismatch key")
|
|
}
|
|
return nil
|
|
}
|