我已经设置了一个服务器,该服务器正在通过下面提到的java函数监听加密的字节数组。早些时候我使用Java(android)来构建我的应用程序,因此使用相同的Java函数很容易,但是我无法弄清楚该函数的dart等效项(flutter)是什么,该函数将字符串作为输入并返回AES加密字节数组作为输出,我可以将其写入tcp套接字。
我也非常感谢帮助我们了解如何将生成的字节数组写入服务器,然后读取类似的响应并通过dart(颤振)对其解密
我已经成功地编写了简单的字符串,并通过dart接收了简单的字符串作为输入和输出到tcp服务器的输入,但是对于加密的字节数组却无法做到。在Java中,我使用DataOutputStream这样将响应发送到服务器
DataOutputStream dOut = newDataOutputStream(socket.getOutputStream());
byte[] s2 = Encrypt3.encrypt2(myString);
dOut.writeInt(s2.length); // write length of the message
dOut.write(s2);
这是我用于AES加密的Java函数
import java.security.Key;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
public class Encrypt3 {
public static String key = "mykey";
public static byte[] encrypt2(String text ){
String encrypt ="";
try{
// Create key and cipher
Key aesKey = new SecretKeySpec(key.getBytes(), "AES");
Cipher cipher = Cipher.getInstance("AES");
// encrypt the text
cipher.init(Cipher.ENCRYPT_MODE, aesKey);
byte[] encrypted = cipher.doFinal(text.getBytes());
return encrypted ;
}catch(Exception e){
System.out.println(e);
}
return null ;
}
public static String decrypt2(byte[] encrypted2){
String decrypt ="";
try{
Key aesKey = new SecretKeySpec(key.getBytes(), "AES");
Cipher cipher = Cipher.getInstance("AES");
// decrypt the text
cipher.init(Cipher.DECRYPT_MODE, aesKey);
decrypt = new String(cipher.doFinal(encrypted2));
}catch(Exception e){
System.out.println(e);
}
return decrypt ;
}
}
我希望当提供字符串作为输入时,在dart中生成等效的字节数组,然后将字节数组写入tcp服务器。
提前谢谢
答案 0 :(得分:1)
配置Java密码的方式默认为电子密码簿(ECB)模式,该模式不应在实际的密码系统中使用。您还依赖默认填充PKCS5。
使用pointcastle
软件包,并进行以下导入:
import 'package:pointycastle/api.dart';
import 'package:pointycastle/block/aes_fast.dart';
import 'package:pointycastle/paddings/pkcs7.dart';
import 'package:pointycastle/padded_block_cipher/padded_block_cipher_impl.dart';
import 'package:pointycastle/block/modes/ecb.dart';
Dart中的近似值是:
List<int> encrypt2(String text) {
// key must be 16 or 32 bytes - not sure how "mykey" could work
// key should really be binary, not a String! Better to use a KDF.
Uint8List key = Uint8List.fromList(
utf8.encode('0123456789abcdef'),
);
PaddedBlockCipher cipher = PaddedBlockCipherImpl(
PKCS7Padding(), // Java defaults to PKCS5 which is equivalent
ECBBlockCipher(AESFastEngine()), // Very weak mode - don't use this in the real world
);
cipher.init(
true,
PaddedBlockCipherParameters<CipherParameters, CipherParameters>(
KeyParameter(key),
null,
),
);
return cipher.process(utf8.encode(text)); // this isn't the same as .toBytes, except for ASCII
}