Header Conversion For DES Encryption

[Doug Gamble]

Can someone help me create a declare statement for a DES encryption
DLL. Below is part of the comment block from the header file.

 * Synopsis:	   DesXxCrypt(key,inp,out,cnt)
 *
 *	Input:	   key - 64-bit DES key
 *                 inp - pointer to buffer of input data
 *                 out - pointer to buffer for result data
 *                 cnt - count of 64-bit blocks to be processed
 *
 *	Output:    None.
 *
 * Side Effect:	   Writes data to output buffer "out".
 *
 *****************************************************************************/
extern  VOID FAR PASCAL DesEnCrypt(LPBYTE key,LPBYTE inp,LPBYTE out,WORD cnt);
extern  VOID FAR PASCAL DesDeCrypt(LPBYTE key,LPBYTE inp,LPBYTE out,WORD cnt);

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Thanks,

Doug Gamble
mailto:[email protected][email protected]</A>

[Florent Heyworth]

Hi

the C declares translate to:

DECLARE SUB DesEnCrypt SDECL ALIAS "DesEnCrypt" (BYVAL pKey AS BYTE PTR, _
                                            BYVAL pInp AS BYTE PTR, _
                                            BYVAL pOut AS BYTE PTR, _
                                            BYVAL wCount AS WORD)
 
DECLARE SUB DesDeCrypt SDECL ALIAS "DesDeCrypt" (BYVAL pKey AS BYTE PTR, _
                                            BYVAL pInp AS BYTE PTR, _
                                            BYVAL pOut AS BYTE PTR, _
                                            BYVAL wCount AS WORD)

 
'There's a small problem however: you'll notice that the 2 C declarations
'have the keyword 'extern' at the front. This indicates that the implementation
'of those routines are in an external file. It could be a header file,
'a library or (this would be best for you), a dynamic link library.
 
'If the routines are implemeted in a DLL then you'll have to add the
'LIB keyword to the SUB declarations as in this example:
 
DECLARE SUB DesEnCrypt SDECL LIB "MyDLL.DLL" ALIAS "DesEnCrypt" (BYVAL pKey AS BYTE PTR, _
                                            BYVAL pInp AS BYTE PTR, _
                                            BYVAL pOut AS BYTE PTR, _
                                            BYVAL wCount AS WORD)
 
DECLARE SUB DesDeCrypt SDECL LIB "MyDLL.DLL" ALIAS "DesDeCrypt" (BYVAL pKey AS BYTE PTR, _
                                            BYVAL pInp AS BYTE PTR, _
                                            BYVAL pOut AS BYTE PTR, _
                                            BYVAL wCount AS WORD)

Cheers

Florent


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