(Tcl) 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.

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load ./chilkat.dll

set pfx [new_CkPfx]

set success [CkPfx_LoadPfxFile $pfx "qa_data/pfx/test_ecdsa_secret.pfx" "secret"]
if {$success == 0} then {
    puts [CkPfx_lastErrorText $pfx]
    delete_CkPfx $pfx
    exit
}

# json is a CkJsonObject
set json [CkPfx_LastJsonData $pfx]
CkJsonObject_put_EmitCompact $json 0
puts [CkJsonObject_emit $json]
delete_CkJsonObject $json

# 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:
set getPrivateKeyAttr 1
set privateKeyIdx 0
puts "---- private key safebag attributes ----"
puts [CkPfx_getSafeBagAttr $pfx $getPrivateKeyAttr $privateKeyIdx localKeyId]
puts [CkPfx_getSafeBagAttr $pfx $getPrivateKeyAttr $privateKeyIdx keyContainerName]
puts [CkPfx_getSafeBagAttr $pfx $getPrivateKeyAttr $privateKeyIdx storageProvider]

# Get the localKeyId attribute for the 1st certificate.
set getPrivateKeyAttr 0
puts "---- cert safebag attributes ----"
puts [CkPfx_getSafeBagAttr $pfx $getPrivateKeyAttr 0 localKeyId]

delete_CkPfx $pfx