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Function silc_hmac_make_truncated SYNOPSIS
        void silc_hmac_make_truncated(SilcHmac hmac,
                                      unsigned char *data,
                                      SilcUInt32 data_len,
                                      SilcUInt32 truncated_len,
                                      unsigned char *return_hash);
DESCRIPTION
        Same as the silc_hmac_make except that the returned MAC is
        truncated to the length indicated by the `truncated_len'.  Some
        special applications may need this function.  The `return_hash'
        must be at least the size of `truncated_len'.
NOTES
        For security reasons, one should not truncate to less than half
        of the length of the true MAC lenght.  However, since this routine
        may be used to non-critical applications this allows these dangerous
        truncations.
SILC HMAC Interface SilcHmac SilcHmacObject silc_hmac_register silc_hmac_unregister silc_hmac_register_default silc_hmac_unregister_all silc_hmac_alloc silc_hmac_free silc_hmac_is_supported silc_hmac_get_supported silc_hmac_len silc_hmac_get_hash silc_hmac_get_name silc_hmac_set_key silc_hmac_get_key silc_hmac_make silc_hmac_make_with_key silc_hmac_make_truncated silc_hmac_init silc_hmac_init_with_key silc_hmac_update silc_hmac_final

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