(Swift 3,4,5...) Encrypt MIME using RSAES-OAEP with SHA256 and AES-128 content encryption

Demonstrates how to encrypt MIME using RSAES-OAEP with SHA256 and AES-128 content encryption.

Note: This example requires Chilkat v9.5.0.67 or greater.

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func chilkatTest() {
    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var success: Bool
    let mime = CkoMime()!

    // Create a MIME message to encrypt.
    mime.newMultipartMixed()
    mime.addHeaderField("someHeader1", value: "Some value 1")
    mime.addHeaderField("someHeader2", value: "Some value 2")

    let part0 = CkoMime()!
    part0.addHeaderField("hdrA", value: "Some value A")
    part0.addHeaderField("hdrB", value: "Some value B")
    part0.contentType = "text/plain"
    part0.setBody("This is the plain-text body.")

    let part1 = CkoMime()!
    part1.addHeaderField("hdrX", value: "Some value X")
    part1.addHeaderField("hdrY", value: "Some value Y")
    part1.contentType = "text/xml"
    part1.setBody("<a>This is the XML body</a>")

    mime.appendPart(part0)
    mime.appendPart(part1)

    // The MIME to be encrypted:
    let sbMime = CkoStringBuilder()!
    mime.getSb(sbMime)
    print("\(sbMime.getAsString()!)")

    // 	Content-Type: multipart/mixed; boundary="------------080303020600020604010008"
    // 	someHeader1: Some value 1
    // 	someHeader2: Some value 2
    // 
    // 	--------------080303020600020604010008
    // 	hdrA: Some value A
    // 	hdrB: Some value B
    // 	Content-Type: text/plain
    // 
    // 	This is the plain-text body.
    // 	--------------080303020600020604010008
    // 	hdrX: Some value X
    // 	hdrY: Some value Y
    // 	Content-Type: text/xml
    // 
    // 	<a>This is the XML body</a>
    // 	--------------080303020600020604010008--
    // 

    // Load an RSA-based certificate.
    // (Encrypting MIME only requires the public key.  Decrypting MIME requires the private key.)
    let cert = CkoCert()!
    success = cert.load(fromFile: "qa_data/rsaes-oaep/cert.pem")
    if success != true {
        print("\(cert.lastErrorText!)")
        return
    }

    // Set the email object properties to indicate the desired encryption.
    mime.pkcs7CryptAlg = "aes"
    // If AES-256 is desired, set the following property to 256.
    mime.pkcs7KeyLength = 128
    mime.oaepPadding = true
    // Other choices for the OAEP hash algorithm are "sha1", "sha384", and "sha512"
    mime.oaepHash = "sha256"

    // Encrypt the MIME (to create S/MIME, which stands for "Secure MIME")
    success = mime.encrypt(cert)
    if success != true {
        print("\(mime.lastErrorText!)")
        return
    }

    print("---------------")
    print("Encrypted MIME:")
    print("---------------")
    print("\(mime.getMime()!)")

    print("Success.")

    // ---------------------------------------------------
    // This is sample output for RSAES-OAEP encrypted MIME:
    // ---------------------------------------------------

    // Content-Type: application/x-pkcs7-mime; name="smime.p7m"; smime-type="enveloped-data"
    // someHeader1: Some value 1
    // someHeader2: Some value 2
    // Content-Disposition: attachment; filename="smime.p7m"
    // Content-Transfer-Encoding: base64
    // 
    // MIIDvAYJKoZIhvcNAQcDoIIDrTCCA6kCAQAxggGgMIIBnAIBADB1MGgxCzAJBgNVBAYTAlVTMQsw
    // CQYDVQQIDAJJTDEQMA4GA1UEBwwHV2hlYXRvbjEhMB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQ
    // dHkgTHRkMRcwFQYDVQQDDA5DaGlsa2F0V2lkZ2V0cwIJAMRwugDmvniwMBwGCSqGSIb3DQEBBzAP
    // oA0wCwYJYIZIAWUDBAIBBIIBAFaUL1ga1bOrdqYKcMm+FHUacBvzfBxk0fnPA0AMBdN8BvTWT3CN
    // YuqBhjOGyq0FpYD9pVZybUuFMCVsVyIW2O62HnsOK58YaPEUUcdH2sI+yjqX9UAn0P0nVDSsVdeK
    // W8x9kMfZg+3UP+y1q+lu7VRJO3f2C9oLQpTkc4VW4n7UOcUI0waykLCjCTL8lFDb7/J3GeuMKyhH
    // 5riNz50kpbzqn7m2Ks9yA+QmcTdXclclGFr2vwEUFzSdT2pxh/vaUrogCxkYWbQ2eV7vZg6O4kV0
    // aqHBqySkPTAzHKiHH8K8GVdlTuJ8350CpICa4T8w7/Ht5I7dyOPPKy4C+rVtrvcwggH+BgkqhkiG
    // 9w0BBwEwHQYJYIZIAWUDBAECBBDTC2WNBN+z2I47/4Feu9YqgIIB0MZvl3nC/q/Wzil6HtfQTr12
    // Q5moHY+ORzAa1P9XvX2ZUFhW530mV395mQw/A4o4ekmX9eRPEZquYzZPLT8hNeZIuNdhpcSQUmad
    // rKnKkR0wKJ3jJ3LhOIohVBQSYs8kVDZKq6lJBIznlsurFelZoNEhyRschhteDZx5rb7fCe8c2+/O
    // DHxaqaHCAzm/Bd7kcg6FFfuTZy3tu0PgP5IsXN4OFA3kkvwjAs4XsVS8jdIcmDNBkYieE8WmJOIm
    // Mz7mh/CHWLgWfGKa0Dkb9RcbFgLwYNT3GzuXFw9XPbKkEZjEAtJajWbN6P0WQl96YYd9qZxUpGxZ
    // zjTHEYzViUdUXolfpLufttrRXyxN1RFWhNFMFbv66xYqklMSgpdM/Mbk+EuvX6eXayDPvDBpfYMw
    // NoRAzv1Ony2c0ez9rBemJICicxAzpuvHbRxdjYs63Dnv+TYgpBK12AxWWpPIjXvw0WQKgTC3Tg8s
    // EnuGhpENqso/clJBEBSn4+2WhYtYbdI5sVme67lvqQl1Xxy3r18SWaQbyDOwgYi1E+54lMDOxMy0
    // y0FPHk5pP45DnXWj+XORPp5LhuZr5mf62YOXSSUwR5P0cXy4Rc+pN5lhRQPCf5z2

}