B4X

Send Encrypted Email using RSAES-OAEP with AES-128 CBC and SHA256

See more SMTP Examples

Demonstrates how to send encrypted email using RSAES-OAEP with SHA256 and AES-128 content encryption.

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

B4X

Dim success As Boolean = False

'  This example requires the Chilkat API to have been previously unlocked.
'  See Global Unlock Sample for sample code.

'  Load an RSA-based certificate.
'  (Encrypting an email only requires the public key.  Decrypting an email requires the private key.)
Dim cert As ChilkatCert
cert.Initialize("cert")
success = cert.LoadFromFile("qa_data/rsaes-oaep/cert.pem")
If success <> True Then
    Log(cert.LastErrorText)
    Return
End If


Dim email As ChilkatEmail
email.Initialize

'  Create a simple email.
email.Subject = "Sample RSAES-OAEP Encrypted Email"
email.Body = "Sample RSAES-OAEP Encrypted Email"
email.From = "support@chilkatsoft.com"

'  Add a recipient.
'  (The email is encrypted using the recipient's certificate.
'  If sending to multiple recipients, then the AddEncryptCert method would
'  need to be called once for each recipient's certificate.)
email.AddTo("Chilkat GMail", "chilkat.support@gmail.com")

'  Set the email object properties to indicate the desired encryption.
email.Pkcs7CryptAlg = "aes"
'  If AES-256 is desired, set the following property to 256.
email.Pkcs7KeyLength = 128
email.OaepPadding = True
'  Other choices for the OAEP hash algorithm are "sha1", "sha384", and "sha512"
email.OaepHash = "sha256"

'  Provide the certificate to be used for encryption
email.AddEncryptCert(cert)

'  Don't forget to indicate that the email should be encrypted when sent..
email.SendEncrypted = True

'  The mailman object will do the RSAES-OAEP encryption when sending.
Dim mailman As ChilkatMailMan
mailman.Initialize("mailman")

'  Set the SMTP settings for your email account on your mail server.
mailman.SmtpUsername = "SMTP_LOGIN"
mailman.SmtpPassword = "SMTP_PASSWORD"
mailman.SmtpHost = "MY_SMTP_DOMAIN_OR_IP"
mailman.SmtpPort = 587
mailman.StartTLS = True

'  Send the email.  The mailman will encrypt the email as directed by the 
'  property settings of the email object.
success = mailman.SendEmail(email)
If success <> True Then
    Log(mailman.LastErrorText)
    Return
End If


success = mailman.CloseSmtpConnection
If success <> True Then
    Log("Connection to SMTP server not closed cleanly.")
End If


Log("Mail Sent!")

'  -----------------------------------------------------------
'  This is an example of an RSAES-OAEP encrypted email
'  -----------------------------------------------------------

'  MIME-Version: 1.0
'  Date: Thu, 27 Apr 2017 08:43:32 -0500
'  Message-ID: <772DC039F0259C474BAC60240EA2BA2272402308@CHILKAT13>
'  Content-Type: application/pkcs7-mime; name="smime.p7m"; smime-type="enveloped-data"
'  Content-Transfer-Encoding: base64
'  X-Priority: 3 (Normal)
'  Subject: Sample RSAES-OAEP Encrypted Email
'  From: support@chilkatsoft.com
'  To: "Chilkat GMail" <chilkat.support@gmail.com>
'  Content-Disposition: attachment; filename="smime.p7m"
'  
'  MIICWQYJKoZIhvcNAQcDoIICSjCCAkYCAQAxggGgMIIBnAIBADB1MGgxCzAJBgNVBAYTAlVTMQsw
'  CQYDVQQIDAJJTDEQMA4GA1UEBwwHV2hlYXRvbjEhMB8GA1UECgwYSW50ZXJuZXQgV2lkZ2l0cyBQ
'  dHkgTHRkMRcwFQYDVQQDDA5DaGlsa2F0V2lkZ2V0cwIJAMRwugDmvniwMBwGCSqGSIb3DQEBBzAP
'  oA0wCwYJYIZIAWUDBAIBBIIBABr0E1dKJjK0FAYRz/NCtJmBeB0nUxgcuBnhGPI/UeyGub3cCo+K
'  G5F4/iVTBJqVvYIF5+fvBnyTginwv7OiUiFWLyihiFC3NIyZJO22+XMHpNatCffTPZk10WswkTgk
'  G3ApnRvGQAaldnFD0Hs8drPU4vBvY9QsjT7YDGa6u2NMX+sr1ewEZArqU0mNfJ6RsEYd5FQbFEVF
'  qLmnz8Dt+yhoJlUtfUd8TXIeqHRJ7RxKOTSzlBZaAdTv2QX4oL9IcAgZeTg5iw+yRPkSAwWyg+I/
'  7fybLsUpRGDHTGUU+AvHvP0kYKa1mkvccBVEC/+4hEyhpS1tWIR5ByY6vM76Z+8wgZwGCSqGSIb3
'  DQEHATAdBglghkgBZQMEAQIEEKqD0YDHX1NsVDaV32UczpeAcLteQyRPTV4hATjwcPiVelPfeWNs
'  xZKRGaEBqLM8+Y+V4ciCFoOlgJuOcP4m1PTHyilfzd+SCsKz5l1C7+sfPf36n2aacX6IWga59Bz5
'  QbWrOHDUT7O5PnGwKVgQFw3Cj4GrdPGWKcoqxB0HuKnj3WA=