diff --git a/signature/csharp/core/signatureUtil.csproj b/signature/csharp/core/signatureUtil.csproj
index 76d6eb2..3e890ed 100644
--- a/signature/csharp/core/signatureUtil.csproj
+++ b/signature/csharp/core/signatureUtil.csproj
@@ -1,45 +1,50 @@
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <Project Sdk="Microsoft.NET.Sdk">
-  <PropertyGroup>
-    <TargetFrameworks>netstandard2.0;net45</TargetFrameworks>
-    <RootNamespace>AlibabaCloud.DarabonbaSignatureUtil</RootNamespace>
-    <OutputType>Library</OutputType>
-    <GeneratePackageOnBuild>false</GeneratePackageOnBuild>
-    <GenerateAssemblyInfo>false</GenerateAssemblyInfo>
-    <AssemblyName>AlibabaCloud.DarabonbaSignatureUtil</AssemblyName>
-    <Version>0.0.4</Version>
-    <LangVersion>5</LangVersion>
-    <Authors>Alibaba Cloud</Authors>
-    <Description>Darabonba Signature Util Library for Alibaba Cloud .NET SDK</Description>
-    <PackageTags>Darabonba Signature Util Library</PackageTags>
-    <Copyright>©2009-present Alibaba Cloud</Copyright>
-    <PackageProjectUrl>https://github.com/aliyun/darabonba-crypto-util</PackageProjectUrl>
-    <PackageIconUrl>https://www.alibabacloud.com/favicon.ico</PackageIconUrl>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(TargetFramework)' == 'netstandard2.0'">
-    <DefineConstants>NETSTANDARD2_0</DefineConstants>
-  </PropertyGroup>
-  <PropertyGroup Condition=" '$(TargetFramework)' == 'net45' ">
-    <DefineConstants>NET45</DefineConstants>
-  </PropertyGroup>
-  <ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">
-    <Reference Include="mscorlib"/>
-    <Reference Include="System"/>
-    <Reference Include="System.Core"/>
-    <Reference Include="Microsoft.CSharp"/>
-    <Reference Include="System.Data"/>
-    <Reference Include="System.Web"/>
-    <Reference Include="System.Drawing"/>
-    <Reference Include="System.Security"/>
-    <Reference Include="System.Xml"/>
-    <Reference Include="System.Configuration"/>
-    <Reference Include="System.Net.Http"/>
-  </ItemGroup>
-  <ItemGroup>
-    <PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0-preview.2">
-      <PrivateAssets>all</PrivateAssets>
-      <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
-    </PackageReference>
-    <PackageReference Include="Portable.BouncyCastle" Version="1.9.0" />
-  </ItemGroup>
+	<PropertyGroup>
+		<TargetFrameworks>netstandard2.0;net45</TargetFrameworks>
+		<RootNamespace>AlibabaCloud.DarabonbaSignatureUtil</RootNamespace>
+		<OutputType>Library</OutputType>
+		<GeneratePackageOnBuild>false</GeneratePackageOnBuild>
+		<GenerateAssemblyInfo>false</GenerateAssemblyInfo>
+		<AssemblyName>AlibabaCloud.DarabonbaSignatureUtil</AssemblyName>
+		<Version>0.0.4</Version>
+		<LangVersion>5</LangVersion>
+		<Authors>Alibaba Cloud</Authors>
+		<Description>Darabonba Signature Util Library for Alibaba Cloud .NET SDK</Description>
+		<PackageTags>Darabonba Signature Util Library</PackageTags>
+		<Copyright>©2009-present Alibaba Cloud</Copyright>
+		<PackageProjectUrl>https://github.com/aliyun/darabonba-crypto-util</PackageProjectUrl>
+		<PackageIconUrl>https://www.alibabacloud.com/favicon.ico</PackageIconUrl>
+	</PropertyGroup>
+	<PropertyGroup Condition=" '$(TargetFramework)' == 'netstandard2.0'">
+		<DefineConstants>NETSTANDARD2_0</DefineConstants>
+	</PropertyGroup>
+	<PropertyGroup Condition=" '$(TargetFramework)' == 'net45' ">
+		<DefineConstants>NET45</DefineConstants>
+	</PropertyGroup>
+	<ItemGroup Condition=" '$(TargetFramework)' == 'net45' ">
+		<Reference Include="mscorlib"/>
+		<Reference Include="System"/>
+		<Reference Include="System.Core"/>
+		<Reference Include="Microsoft.CSharp"/>
+		<Reference Include="System.Data"/>
+		<Reference Include="System.Web"/>
+		<Reference Include="System.Drawing"/>
+		<Reference Include="System.Security"/>
+		<Reference Include="System.Xml"/>
+		<Reference Include="System.Configuration"/>
+		<Reference Include="System.Net.Http"/>
+	</ItemGroup>
+	<ItemGroup  Condition=" '$(TargetFramework)' == 'netstandard2.0'">
+		<PackageReference Include="BouncyCastle.Cryptography" Version="2.4.0" />
+	</ItemGroup>
+	<ItemGroup  Condition=" '$(TargetFramework)' == 'net45' ">
+		<PackageReference Include="Portable.BouncyCastle" Version="1.9.0" />
+	</ItemGroup>
+	<ItemGroup>
+		<PackageReference Include="Microsoft.NETFramework.ReferenceAssemblies" Version="1.0.0-preview.2">
+			<PrivateAssets>all</PrivateAssets>
+			<IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
+		</PackageReference>
+	</ItemGroup>
 </Project>
\ No newline at end of file