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67 lines
1.4 KiB
67 lines
1.4 KiB
package mw
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import (
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"crypto/aes"
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"crypto/cipher"
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"crypto/md5"
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"encoding/base64"
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"errors"
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"fmt"
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"math/rand"
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"strings"
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"sync"
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"time"
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"github.com/OpenIMSDK/Open-IM-Server/pkg/common/config"
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)
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var (
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once sync.Once
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block cipher.Block
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)
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func init() {
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rand.Seed(time.Now().UnixNano())
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}
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func initAesKey() {
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once.Do(func() {
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key := md5.Sum([]byte("openim:" + config.Config.Secret))
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var err error
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block, err = aes.NewCipher(key[:])
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if err != nil {
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panic(err)
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}
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})
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}
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func genReqKey(args []string) string {
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initAesKey()
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plaintext := md5.Sum([]byte(strings.Join(args, ":")))
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iv := make([]byte, aes.BlockSize, aes.BlockSize+md5.Size)
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if _, err := rand.Read(iv); err != nil {
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panic(err)
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}
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ciphertext := make([]byte, md5.Size)
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cipher.NewCBCEncrypter(block, iv).CryptBlocks(ciphertext, plaintext[:])
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return base64.StdEncoding.EncodeToString(append(iv, ciphertext...))
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}
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func verifyReqKey(args []string, key string) error {
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initAesKey()
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k, err := base64.StdEncoding.DecodeString(key)
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if err != nil {
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return fmt.Errorf("invalid key %v", err)
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}
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if len(k) != aes.BlockSize+md5.Size {
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return errors.New("invalid key")
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}
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plaintext := make([]byte, md5.Size)
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cipher.NewCBCDecrypter(block, k[:aes.BlockSize]).CryptBlocks(plaintext, k[aes.BlockSize:])
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sum := md5.Sum([]byte(strings.Join(args, ":")))
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if string(plaintext) != string(sum[:]) {
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return errors.New("mismatch key")
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}
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return nil
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}
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