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(VB.NET) 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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'  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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