English 中文(简体)
Php 64bit 整数散列
原标题:Php 64bit integer hash
  • 时间:2012-05-26 00:09:41
  •  标签:
  • php
Is there a one way hashing algorithm, that can give an integer hash of 64 bits? Tried converting md5 hex into integer(storing large int using gmp library in PHP), but I ll lose precision. Same with SHA1. Is there an existing algorithm (in php or otherwise), that will give a int or a hex which I can convert to an integer(max 64 bits).
问题回答
There re plenty of algorithms, to convert them to an integer you can make use of the gmp extension: $base16 = hash( md5 , hello world ); $base10 = gmp_strval(gmp_init(strtoupper($base16), 16), 10); Where $base16 is the hexadecimal digest returned by the hash function.
You can do print_r(hash_algos()); to see a list of all available PHP hash algorithms, and take your pick for one that suits your needs: Array ( [0] => md2 [1] => md4 [2] => md5 [3] => sha1 [4] => sha224 [5] => sha256 [6] => sha384 [7] => sha512 [8] => ripemd128 [9] => ripemd160 [10] => ripemd256 [11] => ripemd320 [12] => whirlpool [13] => tiger128,3 [14] => tiger160,3 [15] => tiger192,3 [16] => tiger128,4 [17] => tiger160,4 [18] => tiger192,4 [19] => snefru [20] => snefru256 [21] => gost [22] => adler32 [23] => crc32 [24] => crc32b [25] => salsa10 [26] => salsa20 [27] => haval128,3 [28] => haval160,3 [29] => haval192,3 [30] => haval224,3 [31] => haval256,3 [32] => haval128,4 [33] => haval160,4 [34] => haval192,4 [35] => haval224,4 [36] => haval256,4 [37] => haval128,5 [38] => haval160,5 [39] => haval192,5 [40] => haval224,5 [41] => haval256,5 )




相关问题
Brute-force/DoS prevention in PHP [closed]

I am trying to write a script to prevent brute-force login attempts in a website I m building. The logic goes something like this: User sends login information. Check if username and password is ...

please can anyone check this while loop and if condition

<?php $con=mysql_connect("localhost","mts","mts"); if(!con) { die( unable to connect . mysql_error()); } mysql_select_db("mts",$con); /* date_default_timezone_set ("Asia/Calcutta"); $date = ...

定值美元

如何确认来自正确来源的数字。

Generating a drop down list of timezones with PHP

Most sites need some way to show the dates on the site in the users preferred timezone. Below are two lists that I found and then one method using the built in PHP DateTime class in PHP 5. I need ...

Text as watermarking in PHP

I want to create text as a watermark for an image. the water mark should have the following properties front: Impact color: white opacity: 31% Font style: regular, bold Bevel and Emboss size: 30 ...

How does php cast boolean variables?

How does php cast boolean variables? I was trying to save a boolean value to an array: $result["Users"]["is_login"] = true; but when I use debug the is_login value is blank. and when I do ...

热门标签