> crc32, md5 and sha1 functions, implemented in PHP, are widely used for > computing "fingerprint" of any data. But current implementation has not very > good limitation - there is no way to get/set current state vector of these > functions. So, we have to pass whole amount of data as argument of these > functions at once instead of sequently data processing. > Of course, we can use md5_file() or sha1_file() to get hash of huge amounts > of data, but there is missing crc32_file() analog. > > I think, the best way is to add optional parameter to these functions, which > will allow to get/set current state vector of hash algorithms. This change > will not break backward compatibility. > I like the concept of exposing hash contexts to userspace the way they work in C (HASH_init(), HASH_update(), HASH_final()) but I think the more appropriate place to put this "extended" functionality is in the mhash extension.
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