> Were you doing something similar to "byte key [16]"?
As a matter of fact, I was doing
byte aesDKey[32], aesDIV[16];
> I always use the Crypto++ defines.
I could correct it for IV - but hardly for the key size (as my application
requires 256-bit keys).
In your opinion, how should I define the key and the IV (post a code-line or
two please)? (and why would that make a difference?)
> If so, this is the first thing I would correct.
I hear you. But the symptoms ar weird. When the encrypted file contains just
one record - all my code works fine, no problem. When it has more than one
record - my decrypting code dumps core at the moment it tries to set
connection between FileSource and Decryptor...
I've tried this on Windows (XP Pro SP2) under current release of Cygwin.
Checked also on CoLinux - same result. (Still have MS Visual Studio to check
against)
Please find attached the complete source of the test program, together with
two encoded files (file with hex-encoded 256-bit AES key and 128-bit IV, and
file with 5 lines of base64-encoded encrypted 100-byte long text strings).
If anybody can make any sense of it - I'd greatly appreciate it.
Thanks!
> On 9/27/07, Mouse <[EMAIL PROTECTED]> wrote:
> >
> > > Without seeing the code that doesn't work (i.e. precisely what
> > > you're doing to "reverse" the process), it's hard to say why it
> > > doesn't work for you. If you simply don't give the
> > > StreamTransformationFilter an attachment, though, it
> behaves exactly
> > > as you wish.
> >
> > I understand what you're saying. You're right, and your new
> example helps.
> >
> > The funny thing is - my decrypting program dumps core on
> the last line
> > of the following block of code:
> >
> > CBC_Mode<AES>::Decryption decrAES(aesDKey, 32, aesDIV);
> SecByteBlock
> > recbytes; StreamTransformationFilter *aesD =
> > new StreamTransformationFilter(decrAES);
> > FileSource fs("tenc.txt", true, new Base64Decoder(aesD));
> >
> >
> > The example you've given below makes perfect sense. I'm
> tryng to think
> > along the same lines. For some reasons I just can't establish that
> > connection with FileSource...
> >
> > > StreamTransformationFilter * outfilt = new
> > > StreamTransformationFilter(decryptor);
> > > FileSource outgoing(encfile.c_str(), true, new
> > > Base64Decoder(outfilt));
> >
> > Here's where my code coredumps... My debugging is unsuccessful, I'm
> > getting "No stack" with Backtrace...
> >
> > > The loop at the end is a silly example, but I think it
> shows how to
> > > do what you want.
> >
> > Yes it does. Now I need to figure out why that line dumps core (and
> > why that dump seems un-analyzable).
>
> >
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// ui-r3.cpp :
//
#if defined (__unix__)
#define OS_RNG_AVAILABLE 1
#endif
#define FALSE 0
#define TRUE 1
#define CNT_LIMIT 15
#include <cryptopp/cryptlib.h>
#include <cryptopp/hex.h>
#include <cryptopp/aes.h>
#include <cryptopp/modes.h>
#include <cryptopp/oids.h>
#include <cryptopp/files.h>
#include <cryptopp/filters.h>
#include <cryptopp/base64.h>
#include <stdlib.h>
#if defined(__unix__)
#include <unistd.h>
#endif
#include <iostream>
USING_NAMESPACE(CryptoPP);
USING_NAMESPACE(std);
int main(int argc, char ** argv)
{
byte aesDKey[32], aesDIV[16]; // 256-bit key & 128-bit IV
string keyString;
StringSink sk(keyString);
FileSource faesk("keys.txt", true, new HexDecoder(&sk));
memset(aesDKey, 0x0, 32); memset(aesDIV, 0x0, 16);
memcpy(aesDKey, keyString.c_str(), 32);
memcpy(aesDIV, keyString.c_str()+32, 16);
CBC_Mode<AES>::Decryption decrAES(aesDKey, 32, aesDIV);
cout << "Created and configured AES decryptor..." << endl;
SecByteBlock recbytes;
StreamTransformationFilter *aesD =
new StreamTransformationFilter(decrAES);
FileSource fstxt("tenc.txt", true, new Base64Decoder(aesD));
cout << "have " << aesD->MaxRetrievable() << " bytes ready\n";
int i=0, len=0;
while (aesD->AnyRetrievable()) {
recbytes.CleanNew(100);
i = aesD->MaxRetrievable();
len = aesD->Get(recbytes, 100);
cout << "Got " << len << " bytes: \""
<< (char *)recbytes.data() << "\"\n";
}
exit(0);
}
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