(Swift) 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 Downloads for the Swift Programming Language MAC OS X (Cocoa) Objective-C/Swift Libs iOS Objective-C/Swift Libs

func chilkatTest() {
    let email = CkoEmail()

    //  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.)
    var success: Bool = email.AddPfxSourceFile("/pfxFiles/certs_and_keys_1.pfx", pfxPassword: "pfxPassword1")
    if success != true {
        print("\(email.LastErrorText)")
        return
    }

    success = email.AddPfxSourceFile("/pfxFiles/certs_and_keys_2.pfx", pfxPassword: "pfxPassword2")
    if success != true {
        print("\(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 {

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

    }

    if email.ReceivedSigned == true {

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

    }

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

}