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Topic: Problem with SignAndEncrypt method

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mackolo22
Groupie
Groupie

Joined: 09 October 2018
Location: Poland
Online Status: Offline
Posts: 41

Posted: 13 March 2019 at 1:43am \| IP Logged

Hello.
I noticed a very strange behaviour while signing and encrypting a mail. When I call SignAndEncrypt method the message is only encrypted (IsEncrypted == true; IsSigned == false). Both Sign and Encrypt methods work fine but only when I call just one of them. Let me demonstrate you what happens in various situations:

Code:

mailer.Message = secureMime.Encrypt(mailer.Message, certs); // the message is encrypted correctly

mailer.Message = secureMime.Sign(mailer.Message, senderCert); // the message is signed correctly, but is no more encrypted (IsEncrypted == false)

Code:

mailer.Message = secureMime.Sign(mailer.Message, senderCert); // the message is signed correctly

mailer.Message = secureMime.Encrypt(mailer.Message, certs); // the message is encrypted correctly, but is no more signed (IsSigned== false)

Code:

mailer.Message = mailer.Message = secureMime.SignAndEncrypt(mailer.Message, senderCert, certs); // the message is only encrypted

Am I doing something wrong or it's a bug? Maybe this will be helpful: my certificate which I use for signing is revoked and undrusted.

Alex
AfterLogic Support

Joined: 19 November 2003
Online Status: Offline
Posts: 2206

Posted: 13 March 2019 at 4:18am \| IP Logged

Hi,

Encrypting and signing must be done together. It's not possible to encrypt and then sign (or vice versa).

When the message is encrypted, its signature is buried in encrypted data (so it's not available until you decrypt the message).

So, you can call Decrypt and for the decrypted message check IsSigned.

Code:

SmimeResult result = objSmime.Decrypt(encMsg);

signed = result.DecryptedMessage.IsSigned;

Regards,
Alex

mackolo22
Groupie
Groupie

Joined: 09 October 2018
Location: Poland
Online Status: Offline
Posts: 41

Posted: 13 March 2019 at 4:28am \| IP Logged

Ok, now I understand. Thank you very much Alex :)

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