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Re: Help with FileSource

by Jeffrey Walton-3 :: Rate this Message:

> It appears the first byte is not the asnTag. I know this is simple,
> but what am I doing wrong?
You're writing random data, and then trying to read it as an ASN.1
encoded object. Take a look at the wiki's DH example, or Crypto++'s
examples in validate1.cpp, validate2.cpp, etc.

Jeff

On 5/27/09, SpaceCowboy850 <browlett@...> wrote:

>
> I'm using the Deffie-Hellman algorithm in Crypto 5.60 under Visual
> Studio 2005. I'm trying to create my own seed file instead of using
> the ones provided in the example.
>
> This is the way I create my file:
>
> const size_t seedBufSize = 1024;
> unsigned char seedBuf[seedBufSize];
> g_autoRNG.GenerateBlock( reinterpret_cast<byte*>(seedBuf),
> seedBufSize );
> CryptoPP::FileSink fileSink( "seed.dat" );
> fileSink.GetStream()->write( (const char*)seedBuf, seedBufSize );
> fileSink.IsolatedFlush( true, true );
>
> I then try to load it like this:
>
> CryptoPP::FileSource fileSource( "seed.dat", true );
> g_pKeyAgreementAlg = new CryptoPP::DH(fileSource);
>
> I keep getting a BERDecodeError. I've tried using a HexDecoder like
> this:
>
> CryptoPP::FileSource fileSource( "seed.dat", true, new
> CryptoPP::HexDecoder() );
>
> It appears the first byte is not the asnTag. I know this is simple,
> but what am I doing wrong?
>

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