Visual Basic 6.0

S/MIME Encrypt .eml without Sending

See more Email Object Examples

Demonstrates how to encrypt an email using the recipient's digital certificate. This example just encrypts, and does not send the email. Visual Basic 6.0

Dim success As Long
success = 0

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

Dim email As New ChilkatEmail

success = email.LoadEml("c:/temp/email/unencrypted.eml")
If (success = 0) Then
    Debug.Print email.LastErrorText
    Exit Sub
End If

' The email content is encrypted using AES with a 256-bit key, operating in GCM mode, which provides authenticated encryption.
email.Pkcs7CryptAlg = "aes-gcm"
email.Pkcs7KeyLength = 256
email.OaepPadding = 1
email.OaepHash = "sha256"
email.OaepMgfHash = "sha256"

Dim cert As New ChilkatCert
success = cert.LoadFromFile("c/temps/cert/recipient.cer")
If (success = 0) Then
    Debug.Print cert.LastErrorText
    Exit Sub
End If

email.SendEncrypted = 1
success = email.SetEncryptCert(cert)

Dim sbSmime As New ChilkatStringBuilder

' The mailman object applies the encryption by rendering the email according to the instructions (property settings) provided in the email object.
' No email is sent.
Dim mailman As New ChilkatMailMan
success = mailman.RenderToMimeSb(email,sbSmime)
If (success = 0) Then
    Debug.Print mailman.LastErrorText
    Exit Sub
End If

success = sbSmime.WriteFile("c:/temp/encryptedEmail.eml","utf-8",0)
If (success = 0) Then
    Debug.Print mailman.LastErrorText
    Exit Sub
End If

Debug.Print "Success!"