| Function silc_hash_update
 
 SYNOPSIS
 
    void silc_hash_update(SilcHash hash, const unsigned char *data,
                          SilcUInt32 data_len);
DESCRIPTION
    This function may be called to add data to be used in the digest
    computation.  This can be called multiple times to add data from
    many sources before actually computing the digest.  Once you've
    added all the data you need you can call the silc_hash_final to
    actually produce the message digest value.
EXAMPLE
    unsigned char digest[20];
    silc_hash_init(hash);
    silc_hash_update(hash, data, data_len);
    silc_hash_update(hash, more_data, more_data_len);
    silc_hash_final(hash, digest);
 
 
 
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