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To: "Markus Fischer" <markus@fischer.name>
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Date: Sat, 19 Nov 2005 12:35:34 -0800
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Subject: Re: [PHP-DEV] sha256(), sha256_file(), and other hashing algos
From: pollita@php.net ("Sara Golemon")

> I'm missing the functionality to get a list of registered hash functions 
> so one can probe whether a certain hash function is available or not.
>
There is now :)

array hash_algos(void)
Returns numerically indexed array of hashing engine names.

And just incase anyone missed it.  The proto for hash_init() has been 
extended:

resource hash_init(string algo[, int options, string key])

Options currently has one possible value: HASH_HMAC
When specified, key must be specified as well (to be used for the HMAC key).

HMAC can be used with any of the hashing algos included in ext/hash.
Examples of using HMAC with official test vectors can be found in 
tests/hmac-md5.phpt

I'd rather not complicate the proto for the core hash() function with HMAC 
and other options, but maybe a separate hash_hmac() and/or hash_hmac_file() 
might be in order?

-Sara