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Dart encryption library for encrypting/decrypting files, plain text and binary data in AES Crypt file format

License: MIT License

Dart 100.00%

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aes_crypt's Issues

read file from asset directory

I am using this library in flutter.
In
crypt.decryptDataFromFileSync(documentName)
documentName = assets/pdf/tfnt/tfnt_en.pdf
I am getting an error
FileSystemException: Source file assets/pdf/tfnt/tfnt_en.pdf does not exist., path = ''

Does the library support reading files in the assets directory?

Make decryption faster

As the title says, could you make the encryption/decryption process faster?

The chunk 'file header' was expected to be 414553 but found EEFBE5

i have encryption file when i decrypt it i get the error
The chunk 'file header' was expected to be 414553 but found EEFBE5
what does this mean??

  String decryptFile(String path) {
    AesCrypt crypt = AesCrypt();
    crypt.setOverwriteMode(AesCryptOwMode.on);
    crypt.setPassword('my-password');
    crypt.aesSetMode(AesMode.cbc);
    String decFilepath;
    try {
      decFilepath = crypt.decryptFileSync(path);
    } catch (e) {
      print(e);
    }
    return decFilepath;
  }

Null Safety projects can not compile: CUSTOMBUILD : error : Cannot run with sound null safety, because the following dependencies...

Do you have plans to update this splendid package to Sound Null Safety?

I have a Flutter v2.10.1 Windows desktop application that I'm trying to use aes_crypt in.

When I run the project, I get this compile error:

CUSTOMBUILD : error : Cannot run with sound null safety, because the following dependencies [[D:\Code\flutters\apps\cipher_text\build\windows\flutter\flutter_assemble.vcxproj]()]

[C:\Program]() Files (x86)\Microsoft Visual Studio\2019\Community\MSBuild\Microsoft\VC\v160\Microsoft.CppCommon.targets(241,5): error MSB8066: 
Custom build for '[D:\Code\flutters\apps\cipher_text\build\windows\CMakeFiles\28b7fc3e7c3090088060721c2e08b791\flutter_windows.dll.rule]();
[D:\Code\flutters\apps\cipher_text\build\windows\CMakeFiles\5ca9ed3df294d6b6de1a07c2fbdb5b3a\flutter_assemble.rule]()' exited with code 1. 
[[D:\Code\flutters\apps\cipher_text\build\windows\flutter\flutter_assemble.vcxproj]()]

Exception: Build process failed.

flutter doctor

>flutter doctor -v
[√] Flutter (Channel stable, 2.10.1, on Microsoft Windows [Version 10.0.19043.1526], locale en-US)
    • Flutter version 2.10.1 at D:\flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision db747aa133 (12 days ago), 2022-02-09 13:57:35 -0600
    • Engine revision ab46186b24
    • Dart version 2.16.1
    • DevTools version 2.9.2

Thank you for your time and consideration. Karl

Dart 3 incompatible

When this package is going to be compatible for Dart 3 ?

Question: Can aes-crypt be used on Desktop Windows and macOS?

Apologies for the question.

Can aes-crypt be used on Desktop Windows and macOS?

Thank you!

Karl

Error: Unsupported operation: Int64 accessor not supported by dart2js.

is this package supports flutter web?
if yes please share how to encrypt/decrypt text to file in flutter web.

when I try this:

    var crypt = AesCrypt();
    crypt.setPassword('my cool password');
    String rs =
        crypt.encryptTextToFileSync(plainText, 'mytext.txt.aes', utf16: true, );
    print(rs);

it shows error as:

Error: Unsupported operation: Int64 accessor not supported by dart2js.
    at Object.throw_ [as throw] (http://localhost:55860/dart_sdk.js:4334:11)
    at DataView.[dartx.setInt64] (http://localhost:55860/dart_sdk.js:28815:17)
    at http://localhost:55860/packages/aes_crypt/aes_crypt.dart.lib.js:1230:51
    at aes_crypt._Cryptor.init.sha256 (http://localhost:55860/packages/aes_crypt/aes_crypt.dart.lib.js:1232:11)
    at aes_crypt._Cryptor.init.[_keysJoin] (http://localhost:55860/packages/aes_crypt/aes_crypt.dart.lib.js:1452:20)
    at aes_crypt._Cryptor.init.[_createDataParts] (http://localhost:55860/packages/aes_crypt/aes_crypt.dart.lib.js:1510:61)
    at aes_crypt._Cryptor.init.encryptDataToFileSync (http://localhost:55860/packages/aes_crypt/aes_crypt.dart.lib.js:775:29)
    at aes_crypt.AesCrypt.new.encryptDataToFileSync (http://localhost:55860/packages/aes_crypt/aes_crypt.dart.lib.js:418:92)
    at aes_crypt.AesCrypt.new.encryptTextToFileSync (http://localhost:55860/packages/aes_crypt/aes_crypt.dart.lib.js:425:19)
    at Backup.Backup.new.backupdata (http://localhost:55860/packages/website/Dynamic/CustBalDeepLink.dart.lib.js:80737:24)
    at backupdata.next (<anonymous>)
    at http://localhost:55860/dart_sdk.js:37603:33
    at _RootZone.runUnary (http://localhost:55860/dart_sdk.js:37457:58)
    at _FutureListener.thenAwait.handleValue (http://localhost:55860/dart_sdk.js:32441:29)
    at handleValueCallback (http://localhost:55860/dart_sdk.js:32988:49)
    at Function._propagateToListeners (http://localhost:55860/dart_sdk.js:33026:17)
    at _Future.new.[_completeWithValue] (http://localhost:55860/dart_sdk.js:32869:23)
    at async._AsyncCallbackEntry.new.callback (http://localhost:55860/dart_sdk.js:32891:35)
    at Object._microtaskLoop (http://localhost:55860/dart_sdk.js:37718:13)
    at _startMicrotaskLoop (http://localhost:55860/dart_sdk.js:37724:13)

I'm new to this. please help me to encrypt & decrypt my String to file

Please support Stream and decrypt String to String

read data from internet

what about CTR mode

hi,
CTR is one of the main major algorithms of AES encryption but there is no implementation for it in this library, why?

is it going to be included in the future?

Can aes-crypt be used on Flutter Web?

FileSystemException: Failed to open file D:/ProjFlutter/flutter_aes256_app/lib/example/seatestfile.txt.aes for writing., path = 'D:/ProjFlutter/flutter_aes256_app/lib/example/seatestfile.txt.aes' (OS Error: No such file or directory, errno = 2)

I'm using windows 10 pro and Android Studio 3.6.2

And the piece of Flutter code project where I'm testing aes_cryp is:
...
class _MyHomePageState extends State {
int _counter = 0;
String decText = '';
String encFilepath = '';
String srcText = 'Este é o texto que desejo encriptar;'
'Espero que o mesmo seja corretamente'
'encriptado e posteriormente decriptado';

void _incrementCounter() {
debugPrint('bpt1');
seatst();
setState(() {
//debugPrint('bpt2');
_counter++;
});
}

void seatst(){
debugPrint('bpt2');
debugPrint('Source string: $srcText\n');
var crypt = AesCrypt('bibliotecadepasswords são sempre necessarias');
encFilepath = crypt.encryptTextToFileSync(srcText, 'D:/ProjFlutter/flutter_aes256_app/test/seatestfile.txt.aes', utf16: true);
...

ECB without IV

The following code isn't possible ...

crypt.aesSetMode(AesMode.ecb);
crypt.aesSetKeys(keyBytes, Uint8List(0));

The only way was copy the project and comment the line below:

void aesSetKeys(Uint8List key, [Uint8List iv]) {
  if (![16, 24, 32].contains(key.length)) {
    throw AesCryptArgumentError('Invalid key length for AES. Provided ${key.length * 8} bits, expected 128, 192 or 256 bits.');
  } else if (_aesMode != AesMode.ecb && iv.isNullOrEmpty) {
    throw AesCryptArgumentError('The initialization vector is not specified. It can not be empty when AES mode is not ECB.');
  } else if (iv.length != 16) {
    // throw AesCryptArgumentError('Invalid IV length for AES. The initialization vector must be 128 bits long.');
}

Data length for AES in binary data AES encryption/decryption example

Error for example of binary data AES encryption/decryption:

      Uint8List key = Uint8List.fromList(
          [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]);
      Uint8List iv = Uint8List.fromList(
          [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16]);
    
      var crypt = AesCrypt('my cool password');
      crypt.aesSetParams(key, iv, AesMode.cbc);
    
      Uint8List srcData = Uint8List.fromList([1, 2, 3, 4, 5]);
    
      Uint8List encryptedData = crypt.aesEncrypt(srcData); // error on this line
      Uint8List decryptedData = crypt.aesDecrypt(encryptedData);

Invalid argument(s): Invalid data length for AES: 5 bytes.
#0      _Aes.aesEncrypt (package:aes_crypt/src/aes.dart:244:7)
#1      AesCrypt.aesEncrypt (package:aes_crypt/src/aescrypt.dart:370:48)
#2      main (package:aestest/aes.dart:36:35)
#3      _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:301:19)
#4      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:168:12)

how-to-send-binary-encrypted-data-in-flutter-post-with-request-encoding-null

https://stackoverflow.com/questions/70889277/how-to-send-binary-encrypted-data-in-flutter-post-with-request-encoding-null

According to node.js Documentation encoding : null when binary data to be sent via Api,

https://www.npmjs.com/package/request in this link below mentioned explanation is found.

encoding - encoding to be used on setEncoding of response data. If null, the body is returned as a Buffer. Anything else (including the default value of undefined) will be passed as the encoding parameter to toString() (meaning this is effectively utf8 by default).

Note: if you expect binary data, you should set encoding: null.

Now I have achieve the same thing in flutter/dart and this encoding parameter is not accepting null as here in node.js they have mentioned.

I want to know how to make this same Post request from Flutter/dart or at least android/java.

var enc = AESCrypt.encrypt(key, iv, JSON.stringify(obj_j));

var output = new Buffer.from(enc, 'hex'); // Buffer 

function test() {
    console.time("XXX");
    request.post({
   
        headers: {
            'content-type': 'application/json'
        },  //required, or webserver will ignore it application/json  multipart/form-data
        url: 'http://192.168.29.210/deviceid/read', // webserver url
        encoding:null,
        body: output
    },
    function (error, response, body) {
        
        if (!error && response.statusCode == 200) {
             console.timeEnd("XXX");
           
            body = AESCrypt.decrypt(key, iv, body);
             //body is decrypted http response, can be parsed with json method
            fs.writeFile('input.json', body, function (err) {
                if (err) {
                    return console.error(err);
                }
            });
        }
    });

};

Adding code the What i have tried in flutter

    var headers = {'Content-Type': 'application/json'};

    var request =
        http.Request('POST', Uri.parse('http://192.168.29.210/deviceid/read'));
    request.body = encryptedText;
    request.encoding = null ; // here this null parameter is not acceptable 
    request.encoding = Encoding.getByName("utf-8")); // only this option is available to add in flutter 
    request.headers.addAll(headers);

    http.StreamedResponse response = await request.send();

Even in post man this encoding variable is not present to set it.

how to send the binary data that is Uint8List to the POST api body,
which is working with node.js code shown above with 200 ok response. but in flutter the same api returning 408