From a6778b0d3039f3077851292d929bc742cdb15350 Mon Sep 17 00:00:00 2001
From: Mingcai SHEN <archsh@gmail.com>
Date: Wed, 27 Jun 2018 11:00:17 +0800
Subject: [PATCH] Add MD5 Hash string.

---
 utils/md5.go | 33 +++++++++++++++++++++++++++++++++
 1 file changed, 33 insertions(+)
 create mode 100644 utils/md5.go

diff --git a/utils/md5.go b/utils/md5.go
new file mode 100644
index 0000000..fded903
--- /dev/null
+++ b/utils/md5.go
@@ -0,0 +1,33 @@
+package utils
+
+import (
+    "crypto/md5"
+    "encoding/hex"
+)
+
+func MD5Hash(s string) string {
+    hasher := md5.New()
+    hasher.Write([]byte(s))
+    return hex.EncodeToString(hasher.Sum(nil))
+}
+
+func MD5HashExt(s string, seps ...int) (string, []string) {
+    hasher := md5.New()
+    hasher.Write([]byte(s))
+    ss := []rune(hex.EncodeToString(hasher.Sum(nil)))
+    var ret []string
+    if len(seps) >0 {
+        var pos = 0
+        for _, x := range seps {
+            if (pos+x) > len(ss) {
+                panic("overload length of hex string length")
+            }
+            ret = append(ret, string(ss[pos:pos+x]))
+            pos += x
+        }
+        if pos<(len(ss)) {
+            ret = append(ret, string(ss[pos:]))
+        }
+    }
+    return string(ss), ret
+}