Add encalve enabled always encrypted feature

doc/snippets/Microsoft.Data.SqlClient/EnclavePublicKey.xml

@@ -0,0 +1,14 @@
+<docs>
+    <members name="EnclavePublicKey">
+        <EnclavePublicKey>
+            <summary>Class to hold the enclave's RSA public key</summary>
+        </EnclavePublicKey>
+        <PublicKey>
+            <summary>To be added.</summary>
+        </PublicKey>
+        <ctor name="payload">
+            <summary>Instantiates the Class with assigning received payload value to PublicKey</summary>
+            <param name="payload"></param>
+        </ctor>
+    </members>
+</docs>

doc/snippets/Microsoft.Data.SqlClient/SqlConnectionAttestationProtocol.xml

@@ -0,0 +1,21 @@
+<docs>
+    <members name="SqlConnectionAttestationProtocol">
+        <SqlConnectionAttestationProtocol>
+            <summary>
+                Specifies a value for Attestation Protocol.
+            </summary>
+        </SqlConnectionAttestationProtocol>
+        <NotSpecified>
+            <summary>If the attestation protocol is not specified. Use this as default value.</summary>
+            <value>0</value>
+        </NotSpecified>
+        <AAS>
+            <summary>Attestation portocol for Azure Attestation Service</summary>
+            <value>1</value>
+        </AAS>
+        <HGS>
+            <summary>Attestation protocol for Host Guardian Service</summary>
+             <value>3</value>
+        </HGS>
+    </members>
+</docs>

src/Microsoft.Data.SqlClient/netcore/ref/Microsoft.Data.SqlClient.NetCoreApp.cs

@@ -100,6 +100,20 @@ public enum SqlConnectionColumnEncryptionSetting
         /// <include file='../../../../doc/snippets/Microsoft.Data.SqlClient/SqlConnectionColumnEncryptionSetting.xml' path='docs/members[@name="SqlConnectionColumnEncryptionSetting"]/Enabled/*'/>
         Enabled = 1,
     }
+
+    /// <include file='..\..\..\..\doc\snippets\Microsoft.Data.SqlClient\SqlConnectionAttestationProtocol.xml' path='docs/members[@name="SqlConnectionAttestationProtocol"]/SqlConnectionAttestationProtocol/*' />
+    public enum SqlConnectionAttestationProtocol
+    {
+        /// <include file='..\..\..\..\doc\snippets\Microsoft.Data.SqlClient\SqlConnectionAttestationProtocol.xml' path='docs/members[@name="SqlConnectionAttestationProtocol"]/NotSpecified/*' />
+        NotSpecified = 0,
+
+        /// <include file='..\..\..\..\doc\snippets\Microsoft.Data.SqlClient\SqlConnectionAttestationProtocol.xml' path='docs/members[@name="SqlConnectionAttestationProtocol"]/AAS/*' />
+        AAS = 1,
+
+        /// <include file='..\..\..\..\doc\snippets\Microsoft.Data.SqlClient\SqlConnectionAttestationProtocol.xml' path='docs/members[@name="SqlConnectionAttestationProtocol"]/HGS/*' />
+        HGS = 3
+    }
+
     /// <include file='../../../../doc/snippets/Microsoft.Data.SqlClient/SqlColumnEncryptionCertificateStoreProvider.xml' path='docs/members[@name="SqlColumnEncryptionCertificateStoreProvider"]/SqlColumnEncryptionCertificateStoreProvider/*'/>
     public partial class SqlColumnEncryptionCertificateStoreProvider : Microsoft.Data.SqlClient.SqlColumnEncryptionKeyStoreProvider
     {

src/Microsoft.Data.SqlClient/netcore/src/Microsoft.Data.SqlClient.csproj

@@ -45,6 +45,13 @@
     <Compile Include="Microsoft\Data\SqlClient\SqlDelegatedTransaction.NetCoreApp.cs" />
     <Compile Include="Microsoft\Data\SqlClient\TdsParser.NetCoreApp.cs" />
     <Compile Include="Microsoft\Data\SqlClient\SNI\SNIPacket.NetCoreApp.cs" />
+    <Compile Include="Microsoft\Data\SqlClient\AzureAttestationBasedEnclaveProvider.NetCoreApp.cs" />
+    <Compile Include="Microsoft\Data\SqlClient\VirtualSecureModeEnclaveProvider.NetCoreApp.cs" />
+    <Compile Include="Microsoft\Data\SqlClient\VirtualSecureModeEnclaveProviderBase.NetCoreApp.cs" />
+    <Compile Include="Microsoft\Data\SqlClient\AlwaysEncryptedAttestationException.NetCoreApp.cs" />
+    <Compile Include="Microsoft\Data\SqlClient\AlwaysEncryptedEnclaveProviderUtils.NetCoreApp.cs" />
+    <Compile Include="Microsoft\Data\SqlClient\EnclaveProviderBase.NetCoreApp.cs" />
+    <Compile Include="Microsoft\Data\SqlClient\EnclaveSessionCache.NetCoreApp.cs" />
   </ItemGroup>
   <ItemGroup Condition="'$(IsPartialFacadeAssembly)' != 'true' AND '$(OSGroup)' != 'AnyOS' AND '$(TargetGroup)' == 'netstandard'">
     <Compile Include="Microsoft\Data\SqlClient\SqlDelegatedTransaction.NetStandard.cs" />
@@ -270,7 +277,6 @@
     <Compile Include="Microsoft\Data\SqlClient\SqlQueryMetadataCache.cs" />
     <Compile Include="Microsoft\Data\SqlClient\SqlColumnEncryptionEnclaveProvider.cs" />
     <Compile Include="Microsoft\Data\SqlClient\SqlEnclaveAttestationParameters.cs" />
-    <Compile Include="Microsoft\Data\SqlClient\SqlColumnEncryptionEnclaveProviderConfigurationManager.cs" />
     <Compile Include="Microsoft\Data\SqlClient\ColumnEncryptionKeyInfo.cs" />
     <Compile Include="Microsoft\Data\SqlClient\EnclaveDelegate.cs" />
     <Compile Include="Microsoft\Data\SqlClient\DataClassification\SensitivityClassification.cs" />
@@ -587,6 +593,7 @@
     </EmbeddedResource>
   </ItemGroup>
   <ItemGroup>
+    <PackageReference Include="Microsoft.IdentityModel.Protocols.OpenIdConnect" Version="5.5.0" />
     <PackageReference Condition="'$(TargetsWindows)' == 'true' And '$(IsPartialFacadeAssembly)' != 'true' and '$(IsUAPAssembly)' != 'true'" Include="Microsoft.Win32.Registry" Version="4.5.0" />
     <PackageReference Include="System.Configuration.ConfigurationManager" Version="4.5.0" />
     <PackageReference Include="System.Security.Permissions" Version="4.5.0" />

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/Common/DbConnectionStringCommon.cs

@@ -214,6 +214,127 @@ internal static string ColumnEncryptionSettingToString(SqlConnectionColumnEncryp
             }
         }
 
+        #region <<AttestationProtocol Utility>>
+
+        /// <summary>
+        /// Attestation Protocol.
+        /// </summary>
+        const string AttestationProtocolHGS = "HGS";
+        const string AttestationProtocolAAS = "AAS";
+
+        /// <summary>
+        ///  Convert a string value to the corresponding SqlConnectionAttestationProtocol
+        /// </summary>
+        /// <param name="value"></param>
+        /// <param name="result"></param>
+        /// <returns></returns>
+        internal static bool TryConvertToAttestationProtocol(string value, out SqlConnectionAttestationProtocol result)
+        {
+            if (StringComparer.InvariantCultureIgnoreCase.Equals(value, AttestationProtocolHGS))
+            {
+                result = SqlConnectionAttestationProtocol.HGS;
+                return true;
+            }
+            else if (StringComparer.InvariantCultureIgnoreCase.Equals(value, AttestationProtocolAAS))
+            {
+                result = SqlConnectionAttestationProtocol.AAS;
+                return true;
+            }
+            else
+
+                result = DbConnectionStringDefaults.AttestationProtocol;
+            return false;
+            }
+
+        internal static bool IsValidAttestationProtocol(SqlConnectionAttestationProtocol value)
+        {
+            Debug.Assert(Enum.GetNames(typeof(SqlConnectionAttestationProtocol)).Length == 3, "SqlConnectionAttestationProtocol enum has changed, update needed");
+            return value == SqlConnectionAttestationProtocol.NotSpecified
+                || value == SqlConnectionAttestationProtocol.HGS
+                || value == SqlConnectionAttestationProtocol.AAS;
+
+        }
+
+        internal static string AttestationProtocolToString(SqlConnectionAttestationProtocol value)
+        {
+            Debug.Assert(IsValidAttestationProtocol(value), "value is not a valid attestation protocol");
+
+            switch (value)
+            {
+                case SqlConnectionAttestationProtocol.HGS:
+                    return AttestationProtocolHGS;
+                case SqlConnectionAttestationProtocol.AAS:
+                    return AttestationProtocolAAS;
+                default:
+                    return null;
+            }
+        }
+
+        internal static SqlConnectionAttestationProtocol ConvertToAttestationProtocol(string keyword, object value)
+        {
+            if (null == value)
+            {
+                return DbConnectionStringDefaults.AttestationProtocol;
+            }
+
+            string sValue = (value as string);
+            SqlConnectionAttestationProtocol result;
+
+            if (null != sValue)
+            {
+                // try again after remove leading & trailing whitespaces.
+                sValue = sValue.Trim();
+                if (TryConvertToAttestationProtocol(sValue, out result))
+                {
+                    return result;
+                }
+
+                // string values must be valid
+                throw ADP.InvalidConnectionOptionValue(keyword);
+            }
+            else
+            {
+                // the value is not string, try other options
+                SqlConnectionAttestationProtocol eValue;
+
+                if (value is SqlConnectionAttestationProtocol)
+                {
+                    eValue = (SqlConnectionAttestationProtocol)value;
+                }
+                else if (value.GetType().IsEnum)
+                {
+                    // explicitly block scenarios in which user tries to use wrong enum types, like:
+                    // builder["SqlConnectionAttestationProtocol"] = EnvironmentVariableTarget.Process;
+                    // workaround: explicitly cast non-SqlConnectionAttestationProtocol enums to int
+                    throw ADP.ConvertFailed(value.GetType(), typeof(SqlConnectionAttestationProtocol), null);
+                }
+                else
+                {
+                    try
+                    {
+                        // Enum.ToObject allows only integral and enum values (enums are blocked above), rasing ArgumentException for the rest
+                        eValue = (SqlConnectionAttestationProtocol)Enum.ToObject(typeof(SqlConnectionAttestationProtocol), value);
+                    }
+                    catch (ArgumentException e)
+                    {
+                        // to be consistent with the messages we send in case of wrong type usage, replace 
+                        // the error with our exception, and keep the original one as inner one for troubleshooting
+                        throw ADP.ConvertFailed(value.GetType(), typeof(SqlConnectionAttestationProtocol), e);
+                    }
+                }
+
+                if (IsValidAttestationProtocol(eValue))
+                {
+                    return eValue;
+                }
+                else
+                {
+                    throw ADP.InvalidEnumerationValue(typeof(SqlConnectionAttestationProtocol), (int)eValue);
+                }
+            }
+        }
+
+        #endregion
 
         internal static bool IsValidApplicationIntentValue(ApplicationIntent value)
         {
@@ -524,6 +645,7 @@ internal static partial class DbConnectionStringDefaults
         internal static readonly SqlAuthenticationMethod Authentication = SqlAuthenticationMethod.NotSpecified;
         internal const SqlConnectionColumnEncryptionSetting ColumnEncryptionSetting = SqlConnectionColumnEncryptionSetting.Disabled;
         internal const string EnclaveAttestationUrl = "";
+        internal const SqlConnectionAttestationProtocol AttestationProtocol = SqlConnectionAttestationProtocol.NotSpecified;
     }
 
 
@@ -559,6 +681,7 @@ internal static partial class DbConnectionStringKeywords
         internal const string Authentication = "Authentication";
         internal const string ColumnEncryptionSetting = "Column Encryption Setting";
         internal const string EnclaveAttestationUrl = "Enclave Attestation Url";
+        internal const string AttestationProtocol = "Attestation Protocol";
 
         // common keywords (OleDb, OracleClient, SqlClient)
         internal const string DataSource = "Data Source";

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/AlwaysEncryptedAttestationException.NetCoreApp.cs

@@ -0,0 +1,17 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+
+namespace Microsoft.Data.SqlClient
+{
+    internal class AlwaysEncryptedAttestationException : Exception
+    {
+        public AlwaysEncryptedAttestationException(string message, Exception innerException) : base(message, innerException) { }
+
+        public AlwaysEncryptedAttestationException(string message) : base(message) { }
+
+        public AlwaysEncryptedAttestationException() : base() { }
+    }
+}

src/Microsoft.Data.SqlClient/netcore/src/Microsoft/Data/SqlClient/AlwaysEncryptedEnclaveProviderUtils.NetCoreApp.cs

@@ -0,0 +1,55 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System;
+using System.Linq;
+
+namespace Microsoft.Data.SqlClient
+{
+    internal class EnclavePublicKey
+    {
+        public byte[] PublicKey { get; set; }
+
+        public EnclavePublicKey(byte[] payload)
+        {
+            PublicKey = payload;
+        }
+    }
+
+    internal class EnclaveDiffieHellmanInfo
+    {
+        public int Size { get; private set; }
+
+        public byte[] PublicKey { get; private set; }
+
+        public byte[] PublicKeySignature { get; private set; }
+
+        public EnclaveDiffieHellmanInfo(byte[] payload)
+        {
+            Size = payload.Length;
+
+            int offset = 0;
+            int publicKeySize = BitConverter.ToInt32(payload, offset);
+            offset += sizeof(int);
+
+            int publicKeySignatureSize = BitConverter.ToInt32(payload, offset);
+            offset += sizeof(int);
+
+            PublicKey = payload.Skip(offset).Take(publicKeySize).ToArray();
+            offset += publicKeySize;
+
+            PublicKeySignature = payload.Skip(offset).Take(publicKeySignatureSize).ToArray();
+            offset += publicKeySignatureSize;
+        }
+    }
+
+    internal enum EnclaveType
+    {
+        None = 0,
+
+        Vbs = 1,
+
+        Sgx = 2
+    }
+}