Re: CCryptProv Q

From:

mike <mikebizub@hotmail.com>

Newsgroups:

microsoft.public.vc.atl

Date:

Wed, 23 Jan 2008 22:19:07 -0800 (PST)

Message-ID:

<a1f9abb6-4736-49c8-a254-3ce7606ae673@d4g2000prg.googlegroups.com>

On Jan 23, 4:02 pm, "Brian Muth" <bm...@mvps.org> wrote:

0x80070003 = "The system cannot find the path specified."

I'm not sure what that means in the context of your code, however. I'm won=

dering if something is wrong with your certificate store.

Brian

"mike" <mikebi...@hotmail.com> wrote in messagenews:dbc91611-9ca7-4b45-919=

5-ea3983b33c48@e32g2000prn.googlegroups.com...

I have the following sample code that I'm trying to get to work on an
XPsp2 machine using VS2005:

HRESULT hr = E_FAIL;
CString errMsg;
CCryptProv prov;

hr = prov.Initialize(
PROV_RSA_AES
, _T( "aKey" )
, MS_ENH_RSA_AES_PROV
);

if (GetLastError() == NTE_BAD_KEYSET)
{
hr = prov.Initialize(
PROV_RSA_AES
, _T( "aKey" )
, MS_ENH_RSA_AES_PROV
, CRYPT_NEWKEYSET | CRYPT_SILENT
);

}
if( FAILED( hr ) )
{
errMsg.Append( _T( "CCryptProv Initialize failed " ) );
goto EncryptBuffer_Return;
}

On the second prov.Initialize, I receive an hr = 0x80070003. I can'=

seem to find what this is telling me. I'm new to the Encryption
classes in ATL and any help will be appreciated.

Thanks,

Mike- Hide quoted text -

- Show quoted text -

I managed to get past my issue by changing the second Initialize to:

        hr = prov.Initialize(
            PROV_RSA_AES
            , _T( "x264EncoderKey" )
            , NULL //MS_ENHANCED_PROV
            , /*CRYPT_NEWKEYSET |*/ CRYPT_MACHINE_KEYSET
            );

However, I now have another problem in that the Encrypt method only
seems to encrypt the first 8 bytes. This is my function; hoping a
fresh set of eyes can spot something obvious.

Thanks,

Mike

HRESULT CEncryptLib::EncryptBuffer( )
{
    HRESULT hr = E_FAIL;
    CString errMsg;
    CCryptProv prov;

    hr = prov.Initialize(
        PROV_RSA_AES
        , _T( "aKey" )
        , NULL //MS_ENHANCED_PROV
        );

    if (GetLastError() == NTE_BAD_KEYSET)
    {
        hr = prov.Initialize(
            PROV_RSA_AES
            , _T( "aKey" )
            , NULL //MS_ENHANCED_PROV
            , CRYPT_DELETEKEYSET
            );
        hr = prov.Initialize(
            PROV_RSA_AES
            , _T( "aKey" )
            , NULL //MS_ENHANCED_PROV
            , /*CRYPT_NEWKEYSET |*/ CRYPT_MACHINE_KEYSET
            );

    }
    if( FAILED( hr ) )
    {
        errMsg.Append( _T( "CCryptProv Initialize failed " ) );
        goto EncryptBuffer_Return;
    }

    CCryptDerivedKey derKey;
    CCryptMD5Hash md5;

    hr = md5.Initialize( prov );
    if( FAILED( hr ) )
    {
        errMsg.Append( _T( "CCryptSHAHash Initialize failed " ) );
        goto EncryptBuffer_Return;
    }
    BYTE key[ 8 ] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 };
    DWORD keyLen = 8;
    md5.Sign(
        key
        , &keyLen
        );

    hr = derKey.Initialize(
        prov
        , md5
        , CALG_3DES
        );
    if( FAILED( hr ) )
    {
        errMsg.Append( _T( "derKey.Initialize failed " ) );
        goto EncryptBuffer_Return;
    }

    BYTE iv[ 8 ] = { 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08 };

    hr = derKey.SetIV( iv );
    if( FAILED( hr ) )
    {
        errMsg.Append( _T( "derKey.SetIV failed " ) );
        goto EncryptBuffer_Return;
    }

    hr = derKey.SetMode( CRYPT_MODE_CBC );
    if( FAILED( hr ) )
    {
        errMsg.Append( _T( "derKey.SetMode failed " ) );
        goto EncryptBuffer_Return;
    }

    hr = derKey.SetPadding( PKCS5_PADDING );
    if( FAILED( hr ) )
    {
        errMsg.Append( _T( "derKey.SetPadding failed " ) );
        goto EncryptBuffer_Return;
    }

    hr = derKey.SetPermissions( CRYPT_ENCRYPT );
    if( FAILED( hr ) )
    {
        errMsg.Append( _T( "derKey.SetPermissions failed " ) );
        goto EncryptBuffer_Return;
    }

    DWORD encLength = 0;
    hr = derKey.Encrypt(
        TRUE
        , m_pbInBuffer
        , &encLength
        , m_lOutBufferLength
        , md5
        );

EncryptBuffer_Return:
    return hr;
}

encLength always return 8.