diff --git a/internal/utils/find/enter.go b/internal/utils/find/enter.go
new file mode 100644
index 0000000..1d11dad
--- /dev/null
+++ b/internal/utils/find/enter.go
@@ -0,0 +1,11 @@
+package find
+
+func InList[T comparable](list []T, key T) (ok bool) {
+	for _, t := range list {
+		if t == key {
+			return true
+		}
+	}
+
+	return false
+}
diff --git a/internal/utils/md5/file_json.go b/internal/utils/md5/file_json.go
new file mode 100644
index 0000000..bf60961
--- /dev/null
+++ b/internal/utils/md5/file_json.go
@@ -0,0 +1,18 @@
+package md5
+
+import (
+	"crypto/md5"
+	"encoding/hex"
+	"io"
+)
+
+func Md5WithFile(file io.Reader) string {
+	m := md5.New()
+	_, err := io.Copy(m, file)
+	if err != nil {
+		return ""
+	}
+
+	sum := m.Sum(nil)
+	return hex.EncodeToString(sum)
+}
diff --git a/internal/utils/random/string.go b/internal/utils/random/string.go
new file mode 100644
index 0000000..5517216
--- /dev/null
+++ b/internal/utils/random/string.go
@@ -0,0 +1,14 @@
+package random
+
+import "math/rand"
+
+var letters = []rune("1234567890abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ")
+
+func RandStr(n int) string {
+	b := make([]rune, n)
+	for i := range b {
+		b[i] = letters[rand.Intn(len(letters))]
+	}
+
+	return string(b)
+}