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Title: php hash function Post by: leex1528 on May 19, 2014, 01:43:56 PM So I have tried asking around at the gambling sites what
hash('sha512, $var1, $var2, $var3) returns. No one has been able to give me an answer, yet they were all convinced they knew what it meant. I am curious what value that returns. Yes I understand it is the hash sha 512 value, I am more asking how does it calculate that Does it randomize the 3 variables and return them as a 512 bit string in a completely random order? Does it truncate certain variables and then randomize them? Any thoughts on this anyone? Thanks! Title: Re: php hash function Post by: Bitsky on May 20, 2014, 07:25:12 AM So I have tried asking around at the gambling sites what First, you're missing a '.hash('sha512, $var1, $var2, $var3) returns. Anyway, according to the docs this won't return anything but an error: Code: <?php Code: Warning: hash() expects at most 3 parameters, 4 given in test.php on line 3 Title: Re: php hash function Post by: leex1528 on May 20, 2014, 12:45:11 PM So I have tried asking around at the gambling sites what First, you're missing a '.hash('sha512, $var1, $var2, $var3) returns. Anyway, according to the docs this won't return anything but an error: Code: <?php Code: Warning: hash() expects at most 3 parameters, 4 given in test.php on line 3 Sorry for the typo. Errr, I am not asking what that code really does that I wrote, just a in general question. I am trying to learn about the hash function, I did find some good information on it though Title: Re: php hash function Post by: FastSlots on May 20, 2014, 01:13:56 PM There are several different hash functions such as sha, md5, or haval. They can be applied to a string and return another string called a digest. Hash functions have some interesting properties:
* it is easy to compute the digest for any given string * it is infeasible to generate a string that has a given digest * it is infeasible to modify a string without changing the digest * it is infeasible to find two different strings with the same digest. You can learn more about hash functions on wikipedia (http://en.wikipedia.org/wiki/Cryptographic_hash_function) The php function 'hash' takes two inputs, a hash algorithm such as sha256 and a string to be hashed. For example 'hash("sha256", $str)' will return the sha256-hash of the string $str. I guess what you are looking for is the hash of the concatenation of $var1, $var2, $var3. Try 'hash("sha256", $var1.$var2.$var3)'. Title: Re: php hash function Post by: leex1528 on May 20, 2014, 01:31:46 PM Thanks for the info! I will keep researching and try to get a better understanding!
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