<PackageReference Include="Microsoft.Data.SqlClient" Version="7.0.0-preview2.25289.6" />

Microsoft.Data.SqlClient.SqlColumnEncryptionCngProvider

The CMK Store provider implementation for using the Microsoft Cryptography API: Next Generation (CNG) with Always Encrypted.
namespace Microsoft.Data.SqlClient { public class SqlColumnEncryptionCngProvider : SqlColumnEncryptionKeyStoreProvider { public const string ProviderName = "MSSQL_CNG_STORE"; public SqlColumnEncryptionCngProvider(); } }