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+#region Copyright notice and license
+// Copyright 2015, Google Inc.
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+// * Redistributions of source code must retain the above copyright
+// notice, this list of conditions and the following disclaimer.
+// * Redistributions in binary form must reproduce the above
+// copyright notice, this list of conditions and the following disclaimer
+// in the documentation and/or other materials provided with the
+// distribution.
+// * Neither the name of Google Inc. nor the names of its
+// contributors may be used to endorse or promote products derived from
+// this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+#endregion
+using System;
+using System.Runtime.InteropServices;
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace Grpc.Core.Internal
+{
+ /// <summary>
+ /// grpc_channel_credentials from <c>grpc/grpc_security.h</c>
+ /// </summary>
+ internal class ChannelCredentialsSafeHandle : SafeHandleZeroIsInvalid
+ {
+ [DllImport("grpc_csharp_ext.dll", CharSet = CharSet.Ansi)]
+ static extern ChannelCredentialsSafeHandle grpcsharp_ssl_credentials_create(string pemRootCerts, string keyCertPairCertChain, string keyCertPairPrivateKey);
+
+ [DllImport("grpc_csharp_ext.dll")]
+ static extern ChannelCredentialsSafeHandle grpcsharp_composite_channel_credentials_create(ChannelCredentialsSafeHandle channelCreds, CallCredentialsSafeHandle callCreds);
+
+ [DllImport("grpc_csharp_ext.dll")]
+ static extern void grpcsharp_channel_credentials_release(IntPtr credentials);
+
+ private ChannelCredentialsSafeHandle()
+ {
+ }
+
+ public static ChannelCredentialsSafeHandle CreateNullCredentials()
+ {
+ var creds = new ChannelCredentialsSafeHandle();
+ creds.SetHandle(IntPtr.Zero);
+ return creds;
+ }
+
+ public static ChannelCredentialsSafeHandle CreateSslCredentials(string pemRootCerts, KeyCertificatePair keyCertPair)
+ {
+ if (keyCertPair != null)
+ {
+ return grpcsharp_ssl_credentials_create(pemRootCerts, keyCertPair.CertificateChain, keyCertPair.PrivateKey);
+ }
+ else
+ {
+ return grpcsharp_ssl_credentials_create(pemRootCerts, null, null);
+ }
+ }
+
+ public static ChannelCredentialsSafeHandle CreateComposite(ChannelCredentialsSafeHandle channelCreds, CallCredentialsSafeHandle callCreds)
+ {
+ return grpcsharp_composite_channel_credentials_create(channelCreds, callCreds);
+ }
+
+ protected override bool ReleaseHandle()
+ {
+ grpcsharp_channel_credentials_release(handle);
+ return true;
+ }
+ }
+}