Thanks Wei, that did the trick. Now I have to solve the problem in reverse: I need to
use the byte queue to create a key, which I assume is now expecting the x509/pkcs8
wrapped key. How can I get the following to work in 5.1, after making the
modifications to the sample code as you suggested?
RSASSA_PKCS1v15_MD5_Signer RsaPrv( bqRsaPrv );
-----Original Message-----
From: Wei Dai [mailto:[EMAIL PROTECTED]
Sent: Tuesday, November 18, 2003 1:07 PM
To: [EMAIL PROTECTED]
Subject: Re: Getting different results from different Crypto++ versions
You can get the same behavior in 5.1 using:
RsaPrv.GetKey().DEREncodeKey(bqRsaPrv);
The DEREncode() function added an additional x509/pkcs8 wrapper around the
key to be more compatible with other applications.
On Tue, Nov 18, 2003 at 11:21:40AM -0800, James Goodrich wrote:
> 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).
>
