I guess I would have to ask if we could see a resulting private and
public keys in the DERencoded format. I can probably tell you the
difference based on that. Send them directly to me and I'll see what I can
do.
73,
Shawn
> -----Original Message-----
> From: James Goodrich [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, November 18, 2003 2:22 PM
> To: [EMAIL PROTECTED]
> Subject: Getting different results from different Crypto++ versions
>
> I have a question as to why some very similar code produces
> different results using two different versions of Crypto++,
> and more importantly, how to replicate the results using the
> former version with the latter.
>
> Here is the code, first using the older version.
> Unfortunately, I'm not sure of the version, but it's
> somewhere around 3.5 /////////////////////////
> time_t Time;
> time(&Time);
>
> BlockTransformation *pCipher = new DES_EDE_Encryption(
> (BYTE*)CIPHER_SEED);
> X917RNG rng( pCipher,(BYTE*)&Time );
>
> RSAES_PKCS1v15_Decryptor RsaPrv( rng, 1024 );
> RSAES_PKCS1v15_Encryptor RsaPub( RsaPrv );
>
> ByteQueue bqRsaPrv;
> RsaPrv.DEREncode( bqRsaPrv );
> DWORD dwcbRsaPrv = bqRsaPrv.CurrentSize();
>
> ByteQueue bqRsaPub;
> RsaPub.DEREncode( bqRsaPub );
> DWORD dwcbRsaPub = bqRsaPub.CurrentSize();
> //////////////////////////
>
> Now an attempt to do this same thing using version 5.1
> /////////////////////////
> time_t Time;
> time(&Time);
>
> BlockTransformation *pCipher = new DES::Encryption(
> (BYTE*)CIPHER_SEED);
> X917RNG rng( pCipher,(BYTE*)&Time );
>
> RSAES_PKCS1v15_Decryptor RsaPrv( rng, 1024 );
> RSAES_PKCS1v15_Encryptor RsaPub( RsaPrv );
>
> ByteQueue bqRsaPrv;
> RsaPrv.DEREncode( bqRsaPrv );
> DWORD dwcbRsaPrv = bqRsaPrv.CurrentSize();
>
> ByteQueue bqRsaPub;
> RsaPub.DEREncode( bqRsaPub );
> DWORD dwcbRsaPub = bqRsaPub.CurrentSize();
> ///////////////////////////
>
> In the first case, I get
>
> dwcbRsaPrv = 605
> dwcbRsaPub = 138
>
> In the second case, I get
>
> dwcbRsaPrv = 633
> dwcbRsaPub = 160
>
> Why the difference in size and what can I do differently to
> get the previous sizes to be returned using the newer version
> (which is what I really need).
>
>
>
