Dart Requires Chilkat v11.0.0+

Rewrite PFX using AES256-SHA256

See more PFX/P12 Examples

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

import 'package:chilkat/chilkat.dart';

void main() {
  final pfx = CkPfx();

  // Let's load a .pfx and examine the encryption algorithms used to protect the private key:
  try {
    pfx.loadPfxFile('qa_data/pfx/test_secret.pfx', 'secret');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  // Examine the algorithms:

  // "pbeWithSHAAnd3_KeyTripleDES_CBC" or "pbes2"?
  print('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.)
  print('Pbes2CryptAlg: ${pfx.pbes2CryptAlg}');
  print('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.
  final json = CkJsonObject();
  pfx.getLastJsonData(json);

  json.emitCompact = false;
  print(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
  try {
    pfx.toFile('secret', 'qa_output/test_secret_aes256.pfx');
  } on ChilkatException catch (e) {
    print(e.lastErrorText);
    return;
  }

  print('Success.');
}