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(Mono C#) Encrypt MIME using RSAES-OAEP with SHA256 and AES-128 content encryptionDemonstrates 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.
// This requires the Chilkat API to have been previously unlocked. // See Global Unlock Sample for sample code. bool success; Chilkat.Mime mime = new Chilkat.Mime(); // Create a MIME message to encrypt. mime.NewMultipartMixed(); mime.AddHeaderField("someHeader1","Some value 1"); mime.AddHeaderField("someHeader2","Some value 2"); Chilkat.Mime part0 = new Chilkat.Mime(); part0.AddHeaderField("hdrA","Some value A"); part0.AddHeaderField("hdrB","Some value B"); part0.ContentType = "text/plain"; part0.SetBody("This is the plain-text body."); Chilkat.Mime part1 = new Chilkat.Mime(); part1.AddHeaderField("hdrX","Some value X"); part1.AddHeaderField("hdrY","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: Chilkat.StringBuilder sbMime = new Chilkat.StringBuilder(); mime.GetMimeSb(sbMime); Debug.WriteLine(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.) Chilkat.Cert cert = new Chilkat.Cert(); success = cert.LoadFromFile("qa_data/rsaes-oaep/cert.pem"); if (success != true) { Debug.WriteLine(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) { Debug.WriteLine(mime.LastErrorText); return; } Debug.WriteLine("---------------"); Debug.WriteLine("Encrypted MIME:"); Debug.WriteLine("---------------"); Debug.WriteLine(mime.GetMime()); Debug.WriteLine("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 |
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