VB.NET Requires Chilkat v11.0.0+
VB.NET
Send a Signed Email using RSASSA-PSS with SHA256
See more SMTP Examples
Demonstrates how to sign and send an email using the RSASSA-PSS signing algorithm with the SHA256 hash algorithm. .Chilkat VB.NET Downloads
Dim success As Boolean = False
' This example requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.
' Get a digital certificate with private key from a .pfx
' (Chilkat has many different ways to provide a cert + private key for siging.
' Using a PFX is just one possible option.)
Dim pfx As New Chilkat.Pfx
success = pfx.LoadPfxFile("qa_data/rsassa-pss/privatekey.pfx","PFX_PASSWORD")
If (success = False) Then
Debug.WriteLine(pfx.LastErrorText)
Exit Sub
End If
Dim email As New Chilkat.Email
' Create a simple email.
email.Subject = "Sample RSASSA-PSS Signed Email"
email.Body = "Sample RSASSA-PSS Signed Email"
email.From = "from_name@mydomain.com"
' Add one ore more recipients..
email.AddTo("Chilkat Support","support@chilkatsoft.com")
email.AddTo("Chilkat GMail","chilkat.support@gmail.com")
' Indicate that the email is to be signed, and that we want to use RSASSA-PSS.
email.SendSigned = True
email.SigningAlg = "pss"
email.SigningHashAlg = "sha256"
' Get the certificate to be used for signing.
' (The typical case for a PFX is that it contains a cert with an associated private key,
' as well as other certificates in the chain of authentication. The cert with the private
' key should be in the first position at index 0.)
Dim cert As New Chilkat.Cert
success = pfx.CertAt(0,cert)
If (success = False) Then
Debug.WriteLine(pfx.LastErrorText)
Exit Sub
End If
' Tell the email object to use this cert (and private key) for signing.
email.SetSigningCert(cert)
Dim mailman As New Chilkat.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
' Signed email can be sent in two different ways.
' In a multipart/signed email, the signature is attached as a separate MIME part.
' In an opaque email (signedData) the content of the email is encapsulated within the signature
' and the email is sent as "application/pkcs7-mime".
' Either should be fine, but some receiving systems might require one or the other..
mailman.OpaqueSigning = False
' Send the email. The mailman will sign the email as directed by the
' property settings of the email object.
success = mailman.SendEmail(email)
If (success = False) Then
Debug.WriteLine(mailman.LastErrorText)
Exit Sub
End If
success = mailman.CloseSmtpConnection()
If (success <> True) Then
Debug.WriteLine("Connection to SMTP server not closed cleanly.")
End If
Debug.WriteLine("Mail Sent!")
' -----------------------------------------------------------
' This is the MIME of the RSASSA-PSS signed email that was sent
' MIME-Version: 1.0
' Date: Thu, 20 Apr 2017 10:14:58 -0500
' Message-ID: <3682A87344CB3A4FB5EB5BC9908C0C4DA01DA461@CHILKAT13>
' Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha256;
' boundary="------------050103020705000601010800"
' X-Priority: 3 (Normal)
' Subject: Sample RSASSA-PSS Signed Email
' From: support@chilkatsoft.com
' To: "Chilkat Support" <support@chilkatsoft.com>,
' "Chilkat GMail" <chilkat.support@gmail.com>
'
' --------------050103020705000601010800
' Content-Type: text/plain; format=flowed
' Content-Transfer-Encoding: 7bit
'
' Sample RSASSA-PSS Signed Email
' --------------050103020705000601010800
' Content-Transfer-Encoding: base64
' Content-Type: application/pkcs7-signature; name="smime.p7s"
' Content-Disposition: attachment; filename="smime.p7s"
'
' MIIG5wYJKoZIhvcNAQcCoIIG2DCCBtQCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg
' ggL4MIIC9DCCAl2gAwIBAgIJAMPsJCT11cniMA0GCSqGSIb3DQEBCwUAMIGSMQswCQYDVQQGEwJB
' VTERMA8GA1UECAwIVmljdG9yaWExEjAQBgNVBAcMCU1lbGJvdXJuZTEhMB8GA1UECgwYSW50ZXJu
' ZXQgV2lkZ2l0cyBQdHkgTHRkMQ8wDQYDVQQDDAZXaWRnZXQxKDAmBgkqhkiG9w0BCQEWGWFkbWlu
' QGludGVybmV0d2lkZ2V0cy5jb20wHhcNMTYxMTAxMTY1MjMyWhcNMjExMDMxMTY1MjMyWjCBkjEL
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' 41wQ5A==
'
' --------------050103020705000601010800--