diff --git a/src/NSExt/NSExt.csproj b/src/NSExt/NSExt.csproj
index 09804e6..6b5c261 100644
--- a/src/NSExt/NSExt.csproj
+++ b/src/NSExt/NSExt.csproj
@@ -3,6 +3,8 @@
     <PropertyGroup>
         <TargetFramework>net6.0</TargetFramework>
         <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>disable</Nullable>
+        <LangVersion>preview</LangVersion>
     </PropertyGroup>
 
     <ItemGroup>
diff --git a/src/NSExt/StringExtensions.cs b/src/NSExt/StringExtensions.cs
index ce8b0a2..470319d 100644
--- a/src/NSExt/StringExtensions.cs
+++ b/src/NSExt/StringExtensions.cs
@@ -270,6 +270,37 @@ public static class StringExtensions
     }
 
 
+    /// <summary>
+    ///     对一个字符串进行sha1hash运算
+    /// </summary>
+    /// <param name="me">字符串</param>
+    /// <param name="e">字符串使用的编码</param>
+    /// <returns>hash摘要的16进制文本形式（无连字符小写）</returns>
+    public static string Sha1(this string me, Encoding e)
+    {
+        using var sha1 = new SHA1();
+        return BitConverter.ToString(sha1.ComputeHash(e.GetBytes(me)))
+                           .Replace("-", string.Empty)
+                           .ToLower(CultureInfo.CurrentCulture);
+    }
+
+
+    /// <summary>
+    ///     对一个字符串进行sha1hash运算
+    /// </summary>
+    /// <param name="me">字符串</param>
+    /// <param name="secret">密钥</param>
+    /// <param name="e">字符串使用的编码</param>
+    /// <returns>hash摘要的16进制文本形式（无连字符小写）</returns>
+    public static string HmacSha1(this string me, string secret, Encoding e)
+    {
+        using var hmacSha1 = new HMACSHA1(e.GetBytes(secret));
+        return BitConverter.ToString(hmacSha1.ComputeHash(e.GetBytes(me)))
+                           .Replace("-", string.Empty)
+                           .ToLower(CultureInfo.CurrentCulture);
+    }
+
+
     /// <summary>
     ///     MD5 hmac编码
     /// </summary>