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adam.kozovo
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Joined: 30 June 2023
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Posts: 19
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| Posted: 12 July 2023 at 9:56pm | IP Logged
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Hello. do you like to make SmimeResult and MsgConvert Classes disposable to dispose message and certificates from SmimeResult afterwards when used with USING? Such classes which contains sensitive info such as certificates shall be disposable, am I correct?
And after loading an email to EmailMessage , may I always use this code for all kind of messages? (both encrypted and non-encrypted messages)
Dim SmimeResult1 As SmimeResult = Smime1.DecryptAndVerify(EmailMessage1, MessageVerificationFlags.All, Nothing, Nothing)
If SmimeResult1 IsNot Nothing AndAlso SmimeResult1.DecryptedMessage IsNot Nothing Then EmailMessage = SmimeResult1.DecryptedMessage
SmimeResult1.DecryptedMessage.Dispose()
SmimeResult1 = Nothing
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Alex
AfterLogic Support
Joined: 19 November 2003
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Posts: 2207
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| Posted: 13 July 2023 at 2:42am | IP Logged
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Hello,
MsgConvert does not deal with unmanaged resources.
Neither SmimeResult does. Although you can see Dispose in Certificate class the truth is that it remains for backward compatibility only. It does nothing. The original version of MailBee.NET Objects relied on Win32 implementation of certificates and thus indeed used unmanaged resource. However, since .NET 2.0 which added .NET's native support of certificates, this has been rewritten to re-use the managed APIs only.
Regards,
Alex
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adam.kozovo
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| Posted: 14 July 2023 at 11:10pm | IP Logged
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Hello
Thanks for your detailed response, you're right as Dispose was added since .net framework 4.6
https://learn.microsoft.com/en-us/dotnet/api/system.security.cryptography.x509certificates.x509certificate.dispose?view=netframework-4.6
Still makes sense to have a disposable class and manually clear certificate collections and set certificates to nothing:
https://snede.net/the-most-dangerous-constructor-in-net/
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adam.kozovo
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| Posted: 14 July 2023 at 11:15pm | IP Logged
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Sorry forgot to add: after loading an email to EmailMessage , may I always use this code for all kind of messages? (both encrypted and non-encrypted messages)
If I just need the decrypted messages without any certificate info:
Dim SmimeResult1 As SmimeResult = Smime1.DecryptAndVerify(EmailMessage1, MessageVerificationFlags.All, Nothing, Nothing)
If SmimeResult1 IsNot Nothing AndAlso SmimeResult1.DecryptedMessage IsNot Nothing Then EmailMessage = SmimeResult1.DecryptedMessage
SmimeResult1.DecryptedMessage.Dispose()
SmimeResult1 = Nothing
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Alex
AfterLogic Support
Joined: 19 November 2003
Online Status: Offline
Posts: 2207
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| Posted: 18 July 2023 at 3:51am | IP Logged
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Hi,
You're confusing X509Certificate with X509Certificate2. MailBee.NET does not deal with X509Certificate class, only with X509Certificate2 which does not support (neither does it need) Dispose.
As for DecryptAndVerify, mostly yes but I'd recommend DecryptAndVerify2 instead of DecryptAndVerify as it's .NET Standard 2.0 compliant and does not rely on Win32 API.
Regards,
Alex
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