[vsl]

No, these APIs are intentionally designed to be equivalent to hashing all data at once - i.e. to make it possible to hash in O(1) space.

There's nothing "disfunctional" about that.

"Incremental hash function" has a very different meaning and doesn't seem to have any relevance to what is discussed here: https://people.eecs.berkeley.edu/~daw/papers/inchash-cs06.pd...

[blueflow]

I guess the PHP documentation is wrong then. Look at this: https://www.php.net/manual/en/function.hash-init.php

[Thorrez]

That page includes an example that shows PHP's incremental hashing is what you describe as "dysfunctional". It hashes "The quick brown fox jumped over the lazy dog." in 1 part, and in 2 parts, and shows that the resulting hashes are equal.

[blueflow]

I did a mistake.

[ddtaylor]

For anyone curious PHP ultimately uses this definition in their introduction portion of the hash extension:

> This extension provides functions that can be used for direct or incremental processing of arbitrary length messages using a variety of hashing algorithms, including the generation of HMAC values and key derivations including HKDF and PBKDF2.