Hi All,
I have tried a simple test program in which I just read part of a
file, encrypt it and then print the cipher text to screen. However I
notice when a second thread comes in and work on other parts of the
file, the cipher output is start and this propagate to the rest of
the
files.
Code:
//parallelize
while (!EOF)
{
ifstream.open();
//obtain index - codes for obtaining index is correct
{
//read from file
ifstream.seekg(index*size);
ifstream.read(data,size);
//encrypt data
StreamTransformationFilter ab( encryptor, new
CryptoPP::StringSink( CipherText ) );
ab.Put( (const byte*)data, data_size );
ab.MessageEnd();
//print data
printf(data);
}
ifstream.close();
}
encryptor is global variable.
encryptor is define as:
CTR_Mode< AES >::Encryption encryptor;
encryptor.SetKeyWithIV( key, sizeof( key ), iv );
output is correct only when one thread is running 1 thread. Tested by
decrpyting it and compared with original file.
If more than 1 thread is running, the output will be corrupted.
I have also tried encryptor to be private to thread and even variable
to data.
private to thread - every thread has one encrpytor
private to data - every data read, it has one encryptor
Anyone knows why?
On Dec 27, 3:46 pm, eva2002 <[EMAIL PROTECTED]> wrote:
> Hi All,
>
> I am trying out parallel encryption but without any success. Have any
> of you tried out parallel encryption?
>
> CODE:
> StreamTransformationFilter ab( encryptor, new
> CryptoPP::StringSink( CipherText ) );
> ab.Put( (const byte*)data, data_size );
> ab.MessageEnd();
>
> Cipher: AES Cipher mode: CTR
>
> I tried to parallelize the above code but once I set more than 1
> thread running the above code, the output (cipher text) will be wrong
> when I diff (linux command) with a correct file.
>
> I have even tried setting individual "StreamTransformationFilter" &
> "encryptor" for each thread.
>
> Can someone give back some feedback on how to work on parallel
> encryption?
>
> The flow of the data in the program should be correct as I have
> already tested my program with compression.
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