Decrypt S/MIME using a PFX File

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Loads a CMS/PKCS #7 encrypted S/MIME message and decrypts it back to the original MIME content.

DecryptUsingPfxFile decrypts using the certificates and private keys contained in a PFX/P12 file, identified by path and password.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Dim success As Boolean = False

Dim mime As ChilkatMime
mime.Initialize
success = mime.LoadMimeFile("qa_data/encrypted.eml")
If success = False Then
    Log(mime.LastErrorText)
    Return
End If


'  Decrypt using the certificates and private keys in a PFX/P12 file.  The 1st argument is the PFX
'  path and the 2nd is its password (which should come from a secure source).
Dim pfxPassword As String = "myPfxPassword"
success = mime.DecryptUsingPfxFile("qa_data/recipient.pfx", pfxPassword)
If success = False Then
    Log(mime.LastErrorText)
    Return
End If


Dim body As String = mime.GetBodyDecoded
If mime.LastMethodSuccess = False Then
    Log(mime.LastErrorText)
    Return
End If

Log(body)