如何在AES 256中对PHP到Dart / flutter的二进制数据进行加解密

ux6nzvsh 于 2023-03-15 发布在 PHP

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我想在AES 256中加密/解密从PHP到Dart（以及从Dart到PHP）的二进制数据。我的代码可以处理文本数据，但不能处理二进制数据。有人能帮我解决这个问题吗？

在下面的代码中，如果取消注解//text=“hello”，则加密文本是相同的，并且也是未加密的：它起作用了！
如果我保留注解，那么使用二进制数据：对于l_group_id变量，php和dart中的加密文本是不同的（因此未加密的结果也是不同的）

下面是我的代码：
PHP语言：

$_key = 'MySecretKeyForEncryptionAndDecry'; // 32 chars
$_iv = 'helloworldhelloW'; // 16 chars
$_method = 'aes-256-cbc';

$l_group_id = 1540980342;
$text = pack ("N", $l_group_id);
echo "Cypher : ".(($l_group_id >> 24) & 0xFF)." ".(($l_group_id >> 16) & 0xFF)." ".(($l_group_id >> 8) & 0xFF)." ".(($l_group_id) & 0xFF)."<br/>";

//$text = "hello";

$msg1 = openssl_encrypt($text, $_method, $_key, 0, $_iv);
$msg2 = openssl_decrypt($msg1, $_method, $_key, 0, $_iv);

echo "Cypher text : $msg1<br>";
echo "UnCypher text : $msg2<br/>";

dart ：

var key = encrypt.Key.fromUtf8('MySecretKeyForEncryptionAndDecry'); //32 chars
var iv = IV.fromUtf8('helloworldhelloW'); //16 chars

int l_group_id = 1540980342;
Uint8List tab = new Uint8List (13);
tab[0] = ((l_group_id >> 24) & 0xFF);
tab[1] = ((l_group_id >> 16) & 0xFF);
tab[2] = ((l_group_id >> 8) & 0xFF);
tab[3] = ((l_group_id & 0xFF));

String text = String.fromCharCodes(tab);

//text = "hello";

// encrypt
final encrypter = Encrypter(AES(key, mode: AESMode.cbc));
final encrypted = encrypter.encrypt(text, iv: iv);
String msg1 = encrypted.base64;

// decrypt
final msg2 = encrypter.decrypt(Encrypted.fromBase64(msg1), iv: iv);

debugPrint("msg1 : $msg1 - msg2 : $msg2");

谢谢你的帮忙

dart

来源：https://stackoverflow.com/questions/75726527/how-to-cypher-uncypher-binary-data-from-php-to-dart-flutter-in-aes256

2条答案

按热度按时间

ubby3x7f1#

二进制长度似乎不正确（13 vs 4）。使用ByteData也更容易。

final lGroupId = 1540980342;
  // php pack N => 32 bit unsigned big endian => 4 bytes
  // the 3rd parameter is optional - the default *is* big
  final lGroupIdBytes = Uint8List(4)
    ..buffer.asByteData().setUint32(0, lGroupId, Endian.big);

  print(lGroupIdBytes); // should match the values from PHP

  // now use encrypter.encryptBytes(lGroupIdBytes, iv: iv);
  // this assumes the encrypter defaults to PKCS7 padding

赞(0）回复(0）举报 2023-03-15

mqkwyuun2#

解决方案（谢谢理查德）

var key = encrypt.Key.fromUtf8('MySecretKeyForEncryptionAndDecry'); //32 chars
var iv = IV.fromUtf8('helloworldhelloW'); //16 chars

int l_group_id = 1540980342;
// php pack N => 32 bit unsigned big endian => 4 bytes
// the 3rd parameter is optional - the default *is* big
final lGroupIdBytes = Uint8List(4)
  ..buffer.asByteData().setUint32(0, l_group_id, Endian.big);

String text = String.fromCharCodes(lGroupIdBytes);

//text = "hello";

// encrypt
final encrypter = Encrypter(AES(key, mode: AESMode.cbc));
final encrypted = encrypter.encryptBytes (lGroupIdBytes, iv: iv);
String msg1 = encrypted.base64;

// decrypt
final msg2 = encrypter.decryptBytes(Encrypted.fromBase64(msg1), iv: iv);

debugPrint("msg1 : $msg1 - msg2 : $msg2");

赞(0）回复(0）举报 2023-03-15

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如何在AES 256中对PHP到Dart / flutter的二进制数据进行加解密

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