(Mono C#) Load Signed and/or Encrypted Email and Unwrap Security Layers

The LoadEml method loads an email (.eml file containing the MIME of an email) and automatically unwraps the digital signature and encryption security layers. A program can then examine the properties of the email object to see what was unwrapped.

Chilkat .NET Downloads Chilkat .NET Assemblies Chilkat for .NET Core Chilkat for Mono

Chilkat.Email email = new Chilkat.Email();

//  Provide PFX/.p12 files for any certs+keys needed for decryption.
//  Signature verification does not need anything extra.
//  (Also, Chilkat will automatically find and use pre-installed certs + private keys needed for decryption
//  on a Windows system.)
bool success = email.AddPfxSourceFile("/pfxFiles/certs_and_keys_1.pfx","pfxPassword1");
if (success != true) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

success = email.AddPfxSourceFile("/pfxFiles/certs_and_keys_2.pfx","pfxPassword2");
if (success != true) {
    Debug.WriteLine(email.LastErrorText);
    return;
}

//  ...

//  Load a potentially signed and/or encrypted email.
success = email.LoadEml("someDir/someEmail.eml");

//  If the email was signed and/or encrypted, it was "unwrapped", i.e.
//  the email is already decrypted and in a state as if it were never signed or encrypted.

//  You may check to see if the email was received encrypted or signed, and if so,
//  whether it was successfully unwrapped and who signed or encrypted it:
if (email.ReceivedEncrypted == true) {

    Debug.WriteLine("This email was encrypted.");
    if (email.Decrypted == true) {
        Debug.WriteLine("This email was successfully decrypted.  It was encrypted by:");
        Debug.WriteLine(email.EncryptedBy);
    }
    else {
        Debug.WriteLine("This email was not decrypted.");
    }

}

if (email.ReceivedSigned == true) {

    Debug.WriteLine("This email was signed.");
    if (email.SignaturesValid == true) {
        Debug.WriteLine("The signature was verified.  It was signed by:");
        Debug.WriteLine(email.SignedBy);
    }
    else {
        Debug.WriteLine("The signature verification failed.");
    }

}

//  At this point, the contents of the email, including attachments, can be accessed normally..