Rewrite PFX using AES256-SHA256

Demonstrates how to load a .pfx/.p12, examine the encryption algorithm used, and rewrite using aes256-sha256.
Chilkat C# Downloads

bool success = false;

Chilkat.Pfx pfx = new Chilkat.Pfx();

//  Let's load a .pfx and examine the encryption algorithms used to protect the private key:
success = pfx.LoadPfxFile("qa_data/pfx/test_secret.pfx","secret");
if (success == false) {
    Debug.WriteLine(pfx.LastErrorText);
    return;
}

//  Examine the algorithms:

//  "pbeWithSHAAnd3_KeyTripleDES_CBC" or "pbes2"?
Debug.WriteLine("Algorithm: " + pfx.AlgorithmId);

//  If the algorithm is "pbes2" then examine the actual encryption and HMAC algorithms used within pbes2.
//  (If the algorithm is NOT "pbes2", then the following properties are meaningless and will not be modified from their previous values prior to loading the PFX.)
Debug.WriteLine("Pbes2CryptAlg: " + pfx.Pbes2CryptAlg);
Debug.WriteLine("Pbes2HmacAlg: " + pfx.Pbes2HmacAlg);

//  Our output so far:

//  Algorithm: pbeWithSHAAnd3_KeyTripleDES_CBC
//  Pbes2CryptAlg: aes256-cbc
//  Pbes2HmacAlg: hmacWithSha256

//  This tells us that the PFX we loaded was protected using triple-DES with SHA1.
//  (Most existing .pfx/.p12 files use 3DES w/ SHA1.)
//  The Pbes2CryptAlg and Pbes2HmacAlg properties do not apply here because the AlgorithmId is not equal to "pbes2".  We can ignore those values.

//  Examine the last JSON data collected in the call to LoadPfxFile.  This gives us information about what is contained in the PFX, including extended attributes.
Chilkat.JsonObject json = new Chilkat.JsonObject();
pfx.GetLastJsonData(json);

json.EmitCompact = false;
Debug.WriteLine(json.Emit());

//  Sample output

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

//  {
//    "authenticatedSafe": {
//      "contentInfo": [
//        {
//          "type": "Data",
//          "safeBag": [
//            {
//              "type": "pkcs8ShroudedKeyBag",
//              "attrs": {
//                "localKeyId": "16444216",
//                "keyContainerName": "{F09B755A-1E90-444D-9851-02B86CA14961}",
//                "msStorageProvider": "Microsoft Enhanced Cryptographic Provider v1.0"
//              }
//            }
//          ]
//        },
//        {
//          "type": "EncryptedData",
//          "safeBag": [
//            {
//              "type": "certBag",
//              "attrs": {
//                "localKeyId": "16444216"
//              },
//              "subject": "....",
//              "serialNumber": "9999999999999999999999999999"
//            },
//            {
//              "type": "certBag",
//              "attrs": {
//                "authRootSha256Hash": "0vkOXTXKxNQffUTOZq/4heGBX7M5GFhTqH5mwFyb7x4=",
//                "friendlyName": "XYZ",
//                "enhKeyUsage": [
//                  {
//                    "oid": "1.3.6.1.5.5.7.3.2",
//                    "usage": "clientAuth"
//                  },
//                  {
//                    "oid": "1.3.6.1.5.5.7.3.4",
//                    "usage": "emailProtection"
//                  },
//                  {
//                    "oid": "1.3.6.1.5.5.7.3.3",
//                    "usage": "codeSigning"
//                  },
//                  {
//                    "oid": "1.3.6.1.5.5.7.3.8",
//                    "usage": "timeStamping"
//                  },
//                  {
//                    "oid": "1.3.6.1.4.1.311.10.3.4",
//                    "usage": "encryptedFileSystem"
//                  },
//                  {
//                    "oid": "1.3.6.1.5.5.8.2.2",
//                    "usage": "iKEIntermediate"
//                  },
//  
//                  {
//                    "oid": "1.3.6.1.5.5.7.3.6",
//                    "usage": "ipsecTunnel"
//                  },
//                  {
//                    "oid": "1.3.6.1.5.5.7.3.7",
//                    "usage": "ipsecUser"
//                  },
//                  {
//                    "oid": "1.3.6.1.5.5.7.3.5",
//                    "usage": "ipsecEndSystem"
//                  }
//                ]
//              },
//              "subject": "...",
//              "serialNumber": "8888888888888888888888888888"
//            },
//            {
//              "type": "certBag",
//              "subject": "...",
//              "serialNumber": "777777777777777777777777777"
//            }
//          ]
//        }
//      ]
//    }
//  }

//  ------------------------------------------------------------------------------------------
//  OK... now let's change the AlgorithmId to "pbes2" 

pfx.AlgorithmId = "pbes2";

//  We already know from above that the PBES2 crypt and HMAC algorithms are "aes256-cbc" and "hmacWithSha256".
//  Let's set them anyway just for the example...
pfx.Pbes2CryptAlg = "aes256-cbc";
pfx.Pbes2HmacAlg = "hmacWithSha256";

//  Rewrite the PFX using pbes2/aes256 + sha256
success = pfx.ToFile("secret","qa_output/test_secret_aes256.pfx");
if (success == false) {
    Debug.WriteLine(pfx.LastErrorText);
    return;
}

Debug.WriteLine("Success.");