(Go) 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.

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    email := chilkat.NewEmail()

    // 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.)
    success := email.AddPfxSourceFile("/pfxFiles/certs_and_keys_1.pfx","pfxPassword1")
    if success != true {
        fmt.Println(email.LastErrorText())
        email.DisposeEmail()
        return
    }

    success = email.AddPfxSourceFile("/pfxFiles/certs_and_keys_2.pfx","pfxPassword2")
    if success != true {
        fmt.Println(email.LastErrorText())
        email.DisposeEmail()
        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 {

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

    }

    if email.ReceivedSigned() == true {

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

    }

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

    email.DisposeEmail()