diff --git a/EasyTool.Core/CodeCategory/AesUtil.cs b/EasyTool.Core/SecureCategory/AesUtil.cs
similarity index 96%
rename from EasyTool.Core/CodeCategory/AesUtil.cs
rename to EasyTool.Core/SecureCategory/AesUtil.cs
index e2d2bb2..86f5737 100644
--- a/EasyTool.Core/CodeCategory/AesUtil.cs
+++ b/EasyTool.Core/SecureCategory/AesUtil.cs
@@ -1,14 +1,10 @@
 using System;
-using System.Collections.Generic;
-using System.Diagnostics;
-using System.Drawing;
 using System.IO;
 using System.Linq;
 using System.Security.Cryptography;
 using System.Text;
-using static System.Net.Mime.MediaTypeNames;
 
-namespace EasyTool.CodeCategory
+namespace EasyTool
 {
     public static class AesUtil
     {
@@ -96,13 +92,13 @@ private static bool IsLegalSize(string sk)
         /// <param name="encoding">默认UTF8</param>
         /// <returns>加密后的结果</returns>
         /// <exception cref="ArgumentException"></exception>
-        public static string Encrypt(string text, string key, string iv ,CipherMode cipher = CipherMode.CBC, PaddingMode padding = PaddingMode.PKCS7, Encoding? encoding = null)
+        public static string Encrypt(string text, string key, string iv, CipherMode cipher = CipherMode.CBC, PaddingMode padding = PaddingMode.PKCS7, Encoding? encoding = null)
         {
             if (string.IsNullOrWhiteSpace(text))
                 return string.Empty; ;
-            if (!KeyIsLegalSize(key)) 
+            if (!KeyIsLegalSize(key))
                 throw new ArgumentException("不合规的秘钥，请确认秘钥为16 、24、 32位的字符");
-            if (!IvIsLegalSize(iv)) 
+            if (!IvIsLegalSize(iv))
                 throw new ArgumentException("不合规的iv，请确认iv为16位的字符");
             encoding ??= Encoding.UTF8;
 
diff --git a/EasyTool.Core/CodeCategory/DesUtil.cs b/EasyTool.Core/SecureCategory/DesUtil.cs
similarity index 95%
rename from EasyTool.Core/CodeCategory/DesUtil.cs
rename to EasyTool.Core/SecureCategory/DesUtil.cs
index 94e350f..ac275bf 100644
--- a/EasyTool.Core/CodeCategory/DesUtil.cs
+++ b/EasyTool.Core/SecureCategory/DesUtil.cs
@@ -1,11 +1,9 @@
 using System;
-using System.Collections.Generic;
-using System.IO;
 using System.Linq;
 using System.Security.Cryptography;
 using System.Text;
 
-namespace EasyTool.CodeCategory
+namespace EasyTool
 {
     /// <summary>
     /// DES工具类
@@ -78,7 +76,7 @@ public static string Decrypt(string str, string sk, CipherMode cipher = CipherMo
         /// <param name="encoding">默认UTF8</param>
         /// <returns></returns>
         /// <exception cref="ArgumentException"></exception>
-        public static string Encrypt(string str, string sk,string iv, CipherMode cipher = CipherMode.ECB, PaddingMode padding = PaddingMode.PKCS7, Encoding? encoding = null)
+        public static string Encrypt(string str, string sk, string iv, CipherMode cipher = CipherMode.ECB, PaddingMode padding = PaddingMode.PKCS7, Encoding? encoding = null)
         {
             if (string.IsNullOrWhiteSpace(str)) return string.Empty;
             if (!IsLegalSize(sk)) throw new ArgumentException("不合规的秘钥，请确认秘钥为8位的字符");
diff --git a/EasyTool.Core/SecureCategory/MD5Utils.cs b/EasyTool.Core/SecureCategory/MD5Utils.cs
new file mode 100644
index 0000000..0c6a8f0
--- /dev/null
+++ b/EasyTool.Core/SecureCategory/MD5Utils.cs
@@ -0,0 +1,56 @@
+using EasyTool.ConvertCategory;
+using System.IO;
+using System.Security.Cryptography;
+using System.Text;
+
+namespace EasyTool
+{
+    /// <summary>
+    /// MD5加密工具类
+    /// </summary>
+    public class MD5Utils
+    {
+        /// <summary>
+        /// MD5加密
+        /// </summary>
+        /// <param name="source">加密字符串</param>
+        /// <param name="lowerCase">是否小写</param>
+        /// <returns></returns>
+        public static string Encrypt(string source, bool lowerCase = false)
+        {
+            if (string.IsNullOrWhiteSpace(source))
+                return string.Empty;
+
+            return Encrypt(Encoding.UTF8.GetBytes(source), lowerCase);
+        }
+
+        /// <summary>
+        /// MD5加密
+        /// </summary>
+        /// <param name="source">加密字节流</param>
+        /// <param name="lowerCase">是否小写</param>
+        /// <returns></returns>
+        public static string Encrypt(byte[] source, bool lowerCase = false)
+        {
+            if (source == null)
+                return string.Empty;
+
+            using var md5Hash = MD5.Create();
+            return md5Hash.ComputeHash(source).ToHex(lowerCase);
+        }
+
+        /// <summary>
+        /// MD5加密
+        /// </summary>
+        /// <param name="inputStream">流</param>
+        /// <param name="lowerCase">是否小写</param>
+        /// <returns></returns>
+        public static string Encrypt(Stream inputStream, bool lowerCase = false)
+        {
+            if (inputStream == null) return string.Empty;
+
+            using var md5Hash = MD5.Create();
+            return md5Hash.ComputeHash(inputStream).ToHex(lowerCase);
+        }
+    }
+}