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Function silc_hmac_update SYNOPSIS
        void silc_hmac_update(SilcHmac hmac, const unsigned char *data,
                              SilcUInt32 data_len);
DESCRIPTION
        This function may be called to add data to be used in the MAC
        computation.  This can be called multiple times to add data from
        many sources before actually performing the HMAC.  Once you've
        added all the data you need you can call the silc_hmac_final to
        actually produce the MAC.
EXAMPLE
        unsigned char mac[20];
        SilcUInt32 mac_len;

        silc_hmac_init(hmac);
        silc_hmac_update(hmac, data, data_len);
        silc_hmac_update(hmac, more_data, more_data_len);
        silc_hmac_final(hmac, mac, &mac_len);
SILC HMAC Interface SilcHmac SilcHmacObject silc_hmac_register silc_hmac_unregister silc_hmac_register_default 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_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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