(Visual Basic 6.0) ScMinidriver - Get CSP Container Map for Smart Card or USB Token

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Returns the contents of the CSP container map file (cmapfile). This gives an overview of what key containers and certificates exist in the smart card from a CSP's point of view.

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

Dim scmd As New ChilkatScMinidriver

' Reader names (smart card readers or USB tokens) can be discovered
' via PCSC List Readers or PCSC Find Smart Cards
Dim readerName As String
readerName = "SCM Microsystems Inc. SCR33x USB Smart Card Reader 0"
Dim success As Long
success = scmd.AcquireContext(readerName)
If (success = 0) Then
    Debug.Print scmd.LastErrorText
    Exit Sub
End If

Dim json As New ChilkatJsonObject
json.EmitCompact = 0

success = scmd.GetCspContainerMap(json)
If (success = 0) Then
    Debug.Print scmd.LastErrorText
    Exit Sub
End If

Debug.Print json.Emit()

' Here is sample output:
' See below for sample code to parse the JSON.

' --------------------------------------------------------------
' Some notes:
' 
' 1) Empty containers are not listed.
' 2) The "index" is the index of the key container on the card.
'    Note that in the example output below, the card has 4 occupied containers
'    at indexes 0, 1, 2, and 5.
' 3) If you see a key size (in bits) equal to 0, it means that key does not exist.
' 4) A container can potentially contain 2 keys + certificates -- a key for signing (also known as 
'    the "signature" key), and a key for authentication/authorization (also known as the 
'    "key exchange" key).
' 5) It is possible for a key to exist without the certificate.  For example, in the results
'    below there is a 2048-bit key-exchange key at index 1, but no certificate.
' 6) A certificate belonging to the key-exchange key is contained in the "kexCert" JSON member,
'    a certificate belonging to the signature key is contained in the "sigCert" JSON member (not shown below).
' --------------------------------------------------------------

' {
'   "containers": [
'     {
'       "index": 0,
'       "guid": "CertReq-PIVKeyC910-205fc3c2-19fe--42448",
'       "default": true,
'       "sigKeySizeBits": 0,
'       "kexKeySizeBits": 2048,
'       "kexCert": {
'         "serialNum": "15FBFBCF00010000313D",
'         "issuerCN": "PIVKey Device Certificate Authority",
'         "subjectCN": "PIVKey Device Certificate Authority"
'       }
'     },
'     {
'       "index": 1,
'       "guid": "{7b3c32dd-e992-c58f-0822-67d72fd52d43}",
'       "default": false,
'       "sigKeySizeBits": 0,
'       "kexKeySizeBits": 2048
'     },
'     {
'       "index": 2,
'       "guid": "{57547a77-18e7-7516-f5da-6aee13b46bbc}",
'       "default": false,
'       "sigKeySizeBits": 0,
'       "kexKeySizeBits": 2048
'     },
'     {
'       "index": 5,
'       "guid": "{306fd6da-9954-4f75-95c0-178f607a41fb}",
'       "default": false,
'       "sigKeySizeBits": 0,
'       "kexKeySizeBits": 2048,
'       "kexCert": {
'         "serialNum": "17C1B793A24D1A81490F5F768E6D23A5",
'         "issuerCN": "Matt",
'         "subjectCN": "Matt"
'       }
'     }
'   ]
' }

' Use this online tool to generate parsing code from sample JSON: 
' Generate Parsing Code from JSON

Dim index As Long
Dim guid As String
Dim default As Long
Dim sigKeySizeBits As Long
Dim kexKeySizeBits As Long
Dim kexCertSerialNum As String
Dim kexCertIssuerCN As String
Dim kexCertSubjectCN As String
Dim sigCertSerialNum As String
Dim sigCertIssuerCN As String
Dim sigCertSubjectCN As String

Dim i As Long
i = 0
Dim count_i As Long
count_i = json.SizeOfArray("containers")
Do While i < count_i
    json.I = i
    index = json.IntOf("containers[i].index")
    guid = json.StringOf("containers[i].guid")
    default = json.BoolOf("containers[i].default")
    sigKeySizeBits = json.IntOf("containers[i].sigKeySizeBits")
    kexKeySizeBits = json.IntOf("containers[i].kexKeySizeBits")
    kexCertSerialNum = json.StringOf("containers[i].kexCert.serialNum")
    kexCertIssuerCN = json.StringOf("containers[i].kexCert.issuerCN")
    kexCertSubjectCN = json.StringOf("containers[i].kexCert.subjectCN")
    sigCertSerialNum = json.StringOf("containers[i].sigCert.serialNum")
    sigCertIssuerCN = json.StringOf("containers[i].sigCert.issuerCN")
    sigCertSubjectCN = json.StringOf("containers[i].sigCert.subjectCN")
    i = i + 1
Loop

' Delete the context when finished with the card.
success = scmd.DeleteContext()
If (success = 0) Then
    Debug.Print scmd.LastErrorText
End If