unity editor 使用 aws s3 sdk

在unity Editor 编码配套工具时使用到aws 的 s3。在.net 平台下充分测试后 将代码转至unity 中发现 无法与服务器连上

环境: unity 5.1.3f

awsDll  :awssdk.core.3.3.17.9 和 awssdk.s3.3.3.11

捕获异常时发现

System.Net.WebException: Error getting response stream (Write: The authentication or decryption has failed.):
SendFailure
---> System.IO.IOException: The authentication or decryption has failed.
---> Mono.Security.Protocol.Tls.TlsException: Invalid certificate received from server.
Error code: 0xffffffff800b010a at Mono.Security.Protocol.Tls.Handshake.Client.TlsServerCertificate.validateCertificates (Mono.Security.X509.X509CertificateCollection certificates) [0x00000] in <filename unknown>:0
at Mono.Security.Protocol.Tls.Handshake.Client.TlsServerCertificate.ProcessAsTls1 () [0x00000] in <filename unknown>:0
at Mono.Security.Protocol.Tls.Handshake.HandshakeMessage.Process () [0x00000] in <filename unknown>:0
at (wrapper remoting-invoke-with-check) Mono.Security.Protocol.Tls.Handshake.HandshakeMessage:Process ()
at Mono.Security.Protocol.Tls.ClientRecordProtocol.ProcessHandshakeMessage (Mono.Security.Protocol.Tls.TlsStream handMsg) [0x00000] in <filename unknown>:0
at Mono.Security.Protocol.Tls.RecordProtocol.InternalReceiveRecordCallback (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0
--- End of inner exception stack trace ---
at Mono.Security.Protocol.Tls.SslStreamBase.AsyncHandshakeCallback (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0
--- End of inner exception stack trace ---
at System.Net.HttpWebRequest.EndGetResponse (IAsyncResult asyncResult) [0x00000] in <filename unknown>:0
at System.Net.HttpWebRequest.GetResponse () [0x00000] in <filename unknown>:0
at Amazon.Runtime.Internal.HttpRequest.GetResponse () [0x00000] in <filename unknown>:0 "

"  at Amazon.Runtime.Internal.WebExceptionHandler.HandleException (IExecutionContext executionContext, System.Net.WebException exception) [0x00000] in <filename unknown>:0
at Amazon.Runtime.Internal.ExceptionHandler`1[T].Handle (IExecutionContext executionContext, System.Exception exception) [0x00000] in <filename unknown>:0
at Amazon.Runtime.Internal.ErrorHandler.ProcessException (IExecutionContext executionContext, System.Exception exception) [0x00000] in <filename unknown>:0
at Amazon.Runtime.Internal.ErrorHandler.InvokeSync (IExecutionContext executionContext) [0x00000] in <filename unknown>:0
at Amazon.Runtime.Internal.PipelineHandler.InvokeSync (IExecutionContext executionContext) [0x00000] in <filename unknown>:0
at Amazon.Runtime.Internal.CallbackHandler.InvokeSync (IExecutionContext executionContext) [0x00000] in <filename unknown>:0
at Amazon.Runtime.Internal.PipelineHandler.InvokeSync (IExecutionContext executionContext) [0x00000] in <filename unknown>:0
at Amazon.Runtime.Internal.Signer.InvokeSync (IExecutionContext executionContext) [0x00000] in <filename unknown>:0
at Amazon.Runtime.Internal.PipelineHandler.InvokeSync (IExecutionContext executionContext) [0x00000] in <filename unknown>:0
at Amazon.Runtime.Internal.CredentialsRetriever.InvokeSync (IExecutionContext executionContext) [0x00000] in <filename unknown>:0
at Amazon.Runtime.Internal.PipelineHandler.InvokeSync (IExecutionContext executionContext) [0x00000] in <filename unknown>:0
at Amazon.Runtime.Internal.RetryHandler.InvokeSync (IExecutionContext executionContext) [0x00000] in <filename unknown>:0 "

Google 之 使用如下解决方案 

ServicePointManager.ServerCertificateValidationCallback = CertificateValidationCallback;

protected bool CertificateValidationCallback(System.Object sender, X509Certificate certificate, X509Chain chain, SslPolicyErrors sslPolicyErrors)
{
bool isOk = true;
// If there are errors in the certificate chain,
// look at each error to determine the cause.
if (sslPolicyErrors != SslPolicyErrors.None)
{
for (int i = 0; i < chain.ChainStatus.Length; i++)
{
if (chain.ChainStatus[i].Status == X509ChainStatusFlags.RevocationStatusUnknown)
{
continue;
}
chain.ChainPolicy.RevocationFlag = X509RevocationFlag.EntireChain;
chain.ChainPolicy.RevocationMode = X509RevocationMode.Online;
chain.ChainPolicy.UrlRetrievalTimeout = new TimeSpan(0, 1, 0);
chain.ChainPolicy.VerificationFlags = X509VerificationFlags.AllFlags;
bool chainIsValid = chain.Build((X509Certificate2)certificate);
if (!chainIsValid)
{
isOk = false;
break;
}
}
}
return isOk;
}

毕