Mimekit

Question

我正在使用 mimekit 来加密和解密 mime 消息，但每次我尝试解密消息时都会遇到此错误：

Unexpected object reading content. BouncyCastle.Crypto at Org.BouncyCastle.Cms.CmsContentInfoParser..ctor(Stream data) in //crypto/src/cms/CMSContentInfoParser.cs:line 35 at Org.BouncyCastle.Cms.CmsEnvelopedDataParser..ctor(Stream envelopedData) in //crypto/src/cms/CMSEnvelopedDataParser.cs:line 65 at MimeKit.Cryptography.BouncyCastleSecureMimeContext.d__50.MoveNext() at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult() at PasarelaLibrary.Bases.GraphService.BaseGraphPasarela.d__11.MoveNext() in C:\Dev\Euroval\PasarelaAceuro\PasarelaLibrary\Bases\GraphService\BaseGraphPasarela.cs:line 302 at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw() at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task) at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task) at System.Runtime.CompilerServices.TaskAwaiter.GetResult() at PasarelaLibrary.Bases.GraphService.BaseGraphPasarela.d__9.MoveNext() in C:\Dev\Euroval\PasarelaAceuro\PasarelaLibrary\Bases\GraphService\BaseGraphPasarela.cs:line 237

内部异常

Unable to cast object of type 'Org.BouncyCastle.Asn1.DerApplicationSpecific' to type 'Org.BouncyCastle.Asn1.Asn1SequenceParser'. at Org.BouncyCastle.Cms.CmsContentInfoParser..ctor(Stream data) in /_/crypto/src/cms/CMSContentInfoParser.cs:line 27

问题是我只是试图加密和解密消息以测试库和应用程序的流程，但我收到了这个错误。在上面你可以找到我正在使用的代码。我正在使用 x509Certificate 和我在 TemporarySecureMimeContext 中导入的密码。

using var context = new TemporarySecureMimeContext();
await context.ImportAsync(certificate);
var encryptedMessage = await GetEncryptedMessage(context, stream, fileroute, certificate, mailFrom, mailTo);
using var testencrypted = new MemoryStream();
await encryptedMessage.WriteToAsync(testencrypted);
testencrypted.Position = 0;
var dec = await context.DecryptAsync(testencrypted); //here it explodes :(

public static async Task<MimeMessage> GetEncryptedMessage(TemporarySecureMimeContext context, Stream stream, string subject, X509Certificate certificate, string mailFrom, string mailTo)
{
    stream.Position = 0;
    SecureMailboxAddress mailFromEncrypted = new SecureMailboxAddress("name", mailFrom, certificate.GetFingerprint());
    SecureMailboxAddress mailToEncrypted = new SecureMailboxAddress("name", mailTo, certificate.GetFingerprint());
    BodyBuilder bodyBuilder = new BodyBuilder();
    using StreamReader reader = new StreamReader(stream);
    bodyBuilder.TextBody = await reader.ReadToEndAsync();
    MimeMessage message = new MimeMessage(new List<InternetAddress> { mailFromEncrypted }, new List<InternetAddress> { mailToEncrypted }, subject, bodyBuilder.ToMessageBody());
    message.Date = DateTime.Now;
    message.MessageId = MimeUtils.GenerateMessageId();
    await message.EncryptAsync(context);
    return message;
}

我已经阅读了此处和其他论坛中的其他帖子，但对于这种情况没有任何效果。有人可以帮我解决这个问题吗？

Answer 1

你用错了:-)

您正在尝试解密 MIME 消息流。你不能那样做。

SecureMimeContext.Decrypt() 和 DecryptAsync() 方法需要 MIME 消息的加密内容。

如果您的目标是加载 MimeMessage 并解密它，您可以将代码更改为：

using var context = new TemporarySecureMimeContext();
await context.ImportAsync(certificate);

// get an encrypted message
var encryptedMessage = await GetEncryptedMessage(context, stream, fileroute, certificate, mailFrom, mailTo);

// write the encrypted message to a stream
using var testencrypted = new MemoryStream();
await encryptedMessage.WriteToAsync(testencrypted);
testencrypted.Position = 0;

// load the message from the stream
var loadedMessage = await MimeMessage.LoadAsync(testencrypted);

// get the encrypted body
var encryptedBody = (ApplicationPkcs7Mime) loadedMessage.Body;

// decrypt it
var decryptedBody = await encryptedBody.DecryptAsync(context);

// restore the message to the pre-encrypted state
loadedMessage.Body = decryptedBody;

Mimekit - 无法将类型 'Org.BouncyCastle.Asn1.DerApplicationSpecific' 的对象转换为类型 'Org.BouncyCastle.Asn1.Asn1SequenceParser'

Mimekit - Unable to cast object of type 'Org.BouncyCastle.Asn1.DerApplicationSpecific' to type 'Org.BouncyCastle.Asn1.Asn1SequenceParser'

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