(VB.NET) Example: Mime.GetDecryptCertInfo method

Demonstrates the GetDecryptCertInfo method.

Note: This example requires Chilkat v11.4.0 or greater.

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Dim success As Boolean = False

Dim mime As New Chilkat.Mime

' Load MIME that is has Content-Type like this:
' Content-Type: application/pkcs7-mime; smime-type="enveloped-data"; name="smime.p7m"; smime-type="enveloped-data"
success = mime.LoadMimeFile("qa_data/mime/enveloped_data.eml")
If (success = False) Then
    Debug.WriteLine(mime.LastErrorText)
    Exit Sub
End If


' Get information about the certificate that would be needed to decrypt.
' An enveloped-data can potentially be decrypted by multiple certificates if it was encrypted in a way that allows it,
' but in most cases, only a single certificate with associated private key (that of the message recipient) is possible.
Dim json As New Chilkat.JsonObject
success = mime.GetDecryptCertInfo(json)
If (success = False) Then
    Debug.WriteLine(mime.LastErrorText)
    Exit Sub
End If


json.EmitCompact = False
Debug.WriteLine(json.Emit())

' Sample output:

' {
'   "recipientInfo": [
'     {
'       "serial": "****",
'       "issuerCN": "****"
'     }
'   ]
' }

' Get each certificate's information like this:
Dim serial As String
Dim issuerCN As String

Dim i As Integer = 0
Dim count As Integer = json.SizeOfArray("recipientInfo")
While i < count
    json.I = i
    serial = json.StringOf("recipientInfo[i].serial")
    issuerCN = json.StringOf("recipientInfo[i].issuerCN")
    i = i + 1
End While