Sorry . I forgotten that i need to use SHA1 function 

 unsigned char *SHA1(const unsigned char *d, unsigned long n,
                  unsigned char *md);

thanks



>----Messaggio originale----
>Da: [email protected]
>Data: 02/05/2010 10.08
>A: <[email protected]>
>Ogg: Hash message
>
>Hi all
>
>wha's the best way to do a <---- H(M || T) ??
>
>H is a one-way function (preferably SHA1)
>M is a message (string or binary data)
>T ,a are a BIGNUM 
>||  concat
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