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(VB.NET) 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. Dim success As Boolean Dim mime As New Chilkat.Mime ' Create a MIME message to encrypt. mime.NewMultipartMixed() mime.AddHeaderField("someHeader1","Some value 1") mime.AddHeaderField("someHeader2","Some value 2") Dim part0 As 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.") Dim part1 As 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: Dim sbMime As 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.) Dim cert As New Chilkat.Cert success = cert.LoadFromFile("qa_data/rsaes-oaep/cert.pem") If (success <> True) Then Debug.WriteLine(cert.LastErrorText) Exit Sub End If ' 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) Then Debug.WriteLine(mime.LastErrorText) Exit Sub End If 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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