尝试异步工作时 as3Crypto 中出现填充错误

发布于 2024-08-20 17:50:53 字数 1297 浏览 4 评论 0原文

我正在尝试使用 as3crypto 包加密/解密 Flex (AIR) 中的文件。问题是，当尝试处理稍大的文件（超过 5M）时，处理时间会变得非常长并且客户端冻结（获得“无响应”标题）所以我尝试异步并一次加密/解密一个块，并将其与帧刷新率交错。

加密过程很顺利，或者看起来是这样，但是当我尝试将结果解密回原始文档时，我收到填充错误： “错误：PKCS#5：unpad：无效的填充值。预期[252]，发现[152]”

我的代码如下（在启动和结束之间）：

运行方法被重复调用，直到文件完成
_buffer 包含源文件中的字节数组
_结果结果
CHUNK 是字节大小我每次

密码启动时处理的字节数为：Crypto.getCipher("aes-ecb", _key, Crypto.getPad("pkcs5"));

公共函数 run(data:Object):Boolean{

    if((_buffer.length-_position)>CHUNK){
        processChunk(_position,CHUNK);
        _位置+=块；
        var e:ProgressEvent = new ProgressEvent(ProgressEvent.PROGRESS,false,false,_position,_buffer.length);
        this.dispatchEvent(e);
        返回真；
    }否则 if(!_isFinnalized){
        processChunk(_position,_buffer.length - _position);
        this.dispatchEvent(new Event(Event.COMPLETE));
        最终化（）；

    }

    返回假；
}


私有函数 processChunk(position:uint,chunk:uint):void{
    var buffer:ByteArray = new ByteArray();
    buffer.writeBytes(_buffer,位置,块);
     if(_action==加密){
        _aes.加密（缓冲区）；
    }别的{
        _aes.decrypt(缓冲区);
    } 
    _result.writeBytes(缓冲区);


}

请帮助我！

原文

I'm trying to encrypt/decrypt files in flex (AIR) using the as3crypto package.
the problem is that when attempting to process slightly large files (over 5M) the process time gets ridiculously long and the client freezes (get the "not responding" title)
so i tried to go Async and encrypt/decrypt a chunk at a time and interlace it with the frame refresh rate.

the encryption goes smooth, or so it seems, but when i try to decrypt the result back to the original document i get a padding error:
"Error: PKCS#5:unpad: Invalid padding value. expected [252], found [152]"

my code is like so (between initiation and finalization):

the run method gets called repeatedly until the file is completed
_buffer contains the byte array from the source file
_result the result
CHUNK is the bite size of bytes that i process each time

the cipher is initiated as: Crypto.getCipher("aes-ecb", _key, Crypto.getPad("pkcs5"));

public function run(data:Object):Boolean{

    if((_buffer.length-_position)>CHUNK){
        processChunk(_position,CHUNK);
        _position += CHUNK;
        var e:ProgressEvent = new ProgressEvent(ProgressEvent.PROGRESS,false,false,_position,_buffer.length);
        this.dispatchEvent(e);
        return true;
    }else if(!_isFinnalized){
        processChunk(_position,_buffer.length - _position);
        this.dispatchEvent(new Event(Event.COMPLETE));
        finnalize();

    }

    return false;
}


private function processChunk(position:uint,chunk:uint):void{
    var buffer:ByteArray = new ByteArray();
    buffer.writeBytes(_buffer,position,chunk);
     if(_action==ENCRYPT){
        _aes.encrypt(buffer);
    }else{
        _aes.decrypt(buffer);
    } 
    _result.writeBytes(buffer);


}

help me, please!

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