(Visual FoxPro) Get a .pfx/.p12 Safe Bag Attribute

Demonstrates how to get the value of a private key or certificate safe bag attribute. Safe bag attributes are associated with a key or certificate. They are attributes stored in the .p12/.pfx alongside a key or certificate.

Note: This example requires Chilkat v9.5.0.83 or greater.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loPfx
LOCAL lnSuccess
LOCAL loJson
LOCAL lnGetPrivateKeyAttr
LOCAL lnPrivateKeyIdx

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Pfx')
loPfx = CreateObject('Chilkat.Pfx')

lnSuccess = loPfx.LoadPfxFile("qa_data/pfx/test_ecdsa_secret.pfx","secret")
IF (lnSuccess = 0) THEN
    ? loPfx.LastErrorText
    RELEASE loPfx
    CANCEL
ENDIF

loJson = loPfx.LastJsonData()
loJson.EmitCompact = 0
? loJson.Emit()
RELEASE loJson

* The LastJsonData provides information about the what is contained in the PFX after loading.
* For example:

* {
*   "authenticatedSafe": {
*     "contentInfo": [
*       {
*         "type": "Data",
*         "safeBag": [
*           {
*             "type": "pkcs8ShroudedKeyBag",
*             "attrs": {
*               "localKeyId": "16777216",
*               "keyContainerName": "{B99EB9E7-6AF7-42AF-A43A-D4B2225B7605}",
*               "msStorageProvider": "Microsoft Software Key Storage Provider"
*             }
*           }
*         ]
*       },
*       {
*         "type": "EncryptedData",
*         "safeBag": [
*           {
*             "type": "certBag",
*             "attrs": {
*               "localKeyId": "16777216"
*             },
*             "subject": "EE",
*             "serialNumber": "1a9da86df17ad411bb413b2aa724fe56fc71242d"
*           },
*           {
*             "type": "certBag",
*             "subject": "CA",
*             "serialNumber": "02742228acbf3dd2e71f403abd8281ab6d70d490"
*           }
*         ]
*       }
*     ]
*   }
* }

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

* In the above JSON, we can see the .pfx contains one private key (a pkcs8ShroudedKeyBag) and two certificates (each in a certBag).
* The certificates in a .pfx/.p12 are typicaly a single certificate with associated private key, along with the other certificates
* in the chain of authentication.

* We can see that the private key has 3 safebag attributes: localKeyId, keyContainerName, and msStorageProvider.
* The certificate associated with the private key contains one safebag attribute: localKeyId.
* Notice the localKeyId is the same.  The localKeyId helps associate the private key that corresponds to the given certificate.

* Let's demonstrate the GetSafeBagAttr method:

* Get each of the private key safebag attributes:
lnGetPrivateKeyAttr = 1
lnPrivateKeyIdx = 0
? "---- private key safebag attributes ----"
? loPfx.GetSafeBagAttr(lnGetPrivateKeyAttr,lnPrivateKeyIdx,"localKeyId")
? loPfx.GetSafeBagAttr(lnGetPrivateKeyAttr,lnPrivateKeyIdx,"keyContainerName")
? loPfx.GetSafeBagAttr(lnGetPrivateKeyAttr,lnPrivateKeyIdx,"storageProvider")

* Get the localKeyId attribute for the 1st certificate.
lnGetPrivateKeyAttr = 0
? "---- cert safebag attributes ----"
? loPfx.GetSafeBagAttr(lnGetPrivateKeyAttr,0,"localKeyId")

RELEASE loPfx