我目前正在研究proof of concept来实现AS2客户端。我已经设置了一个consle application作为发送者，一个ASP .Net API作为接收者。我尝试使用Windows.Security库来实现这一点，但是那里也存在验证签名的问题。然后我发现MimeKit似乎更易于使用。
在尝试解决我的问题时，在我看来，关于“如何验证签名”的大多数问题都是在{{1}中对签名执行foreach循环的答案}，我尝试这样做，但并没有帮助我。
MultipartSigned是包含整个消息的decrypted。
当我调用MimeEntity时，将出现空引用。
signed.Verify();应该发生的事是签名应该可以，但是实际上发生的事是var signed = decrypted as MultipartSigned;
if (signed != null) {
using (var ctx = new TemporaryMimeContext ()) {
foreach (var signature in signed.Verify (ctx)) {
try {
bool valid = signature.Verify ();
} catch (DigitalSignatureVerifyException) {
// There was an error verifying the signature.
}
}
}
}
出现在汇编文件内部。
堆栈跟踪看起来像这样
null refrence exceptionEDIT
这是 at MimeKit.Cryptography.BouncyCastleSecureMimeContext.<GetDigitalSignaturesAsync>d__28.MoveNext()
at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
at MimeKit.Cryptography.BouncyCastleSecureMimeContext.Verify(Stream content, Stream signatureData, CancellationToken cancellationToken)
at MimeKit.Cryptography.MultipartSigned.Verify(CryptographyContext ctx, CancellationToken cancellationToken)
at AS2_Proof_of_Concept.WebAPI.Controllers.MimeKitController.IncomingMessage() in C:\Users\chris\source\repos\AS2 Proof of Concept\AS2_Proof_of_Concept\AS2_Proof_of_Concept.WebAPI\Controllers\MimeKitController.cs:line 104
at Microsoft.Extensions.Internal.ObjectMethodExecutor.<>c__DisplayClass33_0.<WrapVoidMethod>b__0(Object target, Object[] parameters)
at Microsoft.Extensions.Internal.ObjectMethodExecutor.Execute(Object target, Object[] parameters)
at Microsoft.AspNetCore.Mvc.Internal.ActionMethodExecutor.VoidResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeActionMethodAsync>d__12.MoveNext()
消息的样子。
signed答案 0 :(得分：0)
在逐步使用 private void initAzureConnection(Context context) {
try {
azureClient = new MobileServiceClient(
"https://*.azurewebsites.net",
context
);
} catch (MalformedURLException ex) {
Log.e(LOG_TAG, "failed to initialize azure client", ex);
}
}
方法时，我发现2019-05-06 19:14:15.959 5414-5414/com.*.* E/MAIN_ACTIVITY: failure
com.microsoft.windowsazure.mobileservices.MobileServiceException: Error while processing request.
at com.microsoft.windowsazure.mobileservices.http.MobileServiceConnection$1.onNext(MobileServiceConnection.java:139)
at com.microsoft.windowsazure.mobileservices.MobileServiceClient$15.handleRequest(MobileServiceClient.java:1611)
at com.microsoft.windowsazure.mobileservices.http.MobileServiceConnection.start(MobileServiceConnection.java:114)
at com.microsoft.windowsazure.mobileservices.http.RequestAsyncTask.doInBackground(RequestAsyncTask.java:78)
at com.microsoft.windowsazure.mobileservices.http.RequestAsyncTask.doInBackground(RequestAsyncTask.java:35)
at android.os.AsyncTask$2.call(AsyncTask.java:333)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:764)
Caused by: java.net.SocketTimeoutException: timeout
at okio.Okio$4.newTimeoutException(Okio.java:232)
at okio.AsyncTimeout.exit(AsyncTimeout.java:285)
at okio.AsyncTimeout$2.read(AsyncTimeout.java:241)
at okio.RealBufferedSource.indexOf(RealBufferedSource.java:354)
at okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:226)
at okhttp3.internal.http1.Http1Codec.readHeaderLine(Http1Codec.java:215)
at okhttp3.internal.http1.Http1Codec.readResponseHeaders(Http1Codec.java:189)
at okhttp3.internal.http.CallServerInterceptor.intercept(CallServerInterceptor.java:88)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:45)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:126)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:254)
at okhttp3.RealCall.execute(RealCall.java:92)
at com.microsoft.windowsazure.mobileservices.http.ServiceFilterRequestImpl.execute(ServiceFilterRequestImpl.java:164)
at com.microsoft.windowsazure.mobileservices.http.MobileServiceConnection$1.onNext(MobileServiceConnection.java:122)
at com.microsoft.windowsazure.mobileservices.MobileServiceClient$15.handleRequest(MobileServiceClient.java:1611)
at com.microsoft.windowsazure.mobileservices.http.MobileServiceConnection.start(MobileServiceConnection.java:114)
at com.microsoft.windowsazure.mobileservices.http.RequestAsyncTask.doInBackground(RequestAsyncTask.java:78)
at com.microsoft.windowsazure.mobileservices.http.RequestAsyncTask.doInBackground(RequestAsyncTask.java:35)
at android.os.AsyncTask$2.call(AsyncTask.java:333)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:764)
Caused by: java.net.SocketException: socket is closed
at com.android.org.conscrypt.ConscryptFileDescriptorSocket$SSLInputStream.read(ConscryptFileDescriptorSocket.java:551)
at okio.Okio$2.read(Okio.java:140)
at okio.AsyncTimeout$2.read(AsyncTimeout.java:237)
at okio.RealBufferedSource.indexOf(RealBufferedSource.java:354)
at okio.RealBufferedSource.readUtf8LineStrict(RealBufferedSource.java:226)
at okhttp3.internal.http1.Http1Codec.readHeaderLine(Http1Codec.java:215)
at okhttp3.internal.http1.Http1Codec.readResponseHeaders(Http1Codec.java:189)
at okhttp3.internal.http.CallServerInterceptor.intercept(CallServerInterceptor.java:88)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.connection.ConnectInterceptor.intercept(ConnectInterceptor.java:45)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.internal.cache.CacheInterceptor.intercept(CacheInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.internal.http.BridgeInterceptor.intercept(BridgeInterceptor.java:93)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RetryAndFollowUpInterceptor.intercept(RetryAndFollowUpInterceptor.java:126)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:147)
at okhttp3.internal.http.RealInterceptorChain.proceed(RealInterceptorChain.java:121)
at okhttp3.RealCall.getResponseWithInterceptorChain(RealCall.java:254)
at okhttp3.RealCall.execute(RealCall.java:92)
at com.microsoft.windowsazure.mobileservices.http.ServiceFilterRequestImpl.execute(ServiceFilterRequestImpl.java:164)
at com.microsoft.windowsazure.mobileservices.http.MobileServiceConnection$1.onNext(MobileServiceConnection.java:122)
at com.microsoft.windowsazure.mobileservices.MobileServiceClient$15.handleRequest(MobileServiceClient.java:1611)
at com.microsoft.windowsazure.mobileservices.http.MobileServiceConnection.start(MobileServiceConnection.java:114)
at com.microsoft.windowsazure.mobileservices.http.RequestAsyncTask.doInBackground(RequestAsyncTask.java:78)
at com.microsoft.windowsazure.mobileservices.http.RequestAsyncTask.doInBackground(RequestAsyncTask.java:35)
at android.os.AsyncTask$2.call(AsyncTask.java:333)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1167)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:641)
at java.lang.Thread.run(Thread.java:764)
处的BounncyCastleMimeContext.GetDigitalSignatureAsync()是SignerInformation.SignedAttributes，然后空引用导致SecureMimeDigitalSignature (SignerInformation signerInfo, X509Certificate certificate)成为也null。
答案 1 :(得分：0)
这是Mime 2.1.4中的合法错误，现已在https://www.myget.org/feed/mimekit/package/nuget/MimeKit的内部版本2.1.4.9中修复。