PHP 的Hash算法是比较常用的,现在的MD5有时候不太安全,就得用到Hash_algos()中的其它算法,下面进行了一个性能的比较。
php代码:
define('testtime', 50000);
$algos = hash_algos();
foreach($algos as $algo) {
	$st = microtime();
	for($i = 0; $i < testtime; $i++) {
		hash($algo, microtime().$i);
	}
	$et = microtime();
	list($ss, $si) = explode(' ', $st);
	list($es, $ei) = explode(' ', $et);
	$time[$algo] = $ei + $es - $si - $ss;
}
asort($time, SORT_NUMERIC);
echo "
";
print_r($time);
</pre>
<pre>Array
(
    [crc32b] => 0.14577506593323
    [crc32] => 0.14600901216125
    [adler32] => 0.14769597711182
    [md4] => 0.1584680151825
    [md5] => 0.15956400747681
    [salsa20] => 0.16176804933166
    [salsa10] => 0.16325911569214
    [tiger128,3] => 0.16543607070923
    [sha1] => 0.16547892630005
    [tiger160,3] => 0.16672711079407
    [tiger192,3] => 0.16793211837769
    [tiger128,4] => 0.16802901655579
    [sha224] => 0.16959108877563
    [tiger160,4] => 0.1713979150238
    [tiger192,4] => 0.1717759589386
    [sha256] => 0.17396298696899
    [ripemd256] => 0.17431005943298
    [ripemd128] => 0.17437094918823
    [ripemd320] => 0.17870710316467
    [haval160,3] => 0.18147005220032
    [haval256,3] => 0.18150104528809
    [haval224,3] => 0.18176211320496
    [sha512] => 0.18234492471313
    [haval192,3] => 0.18296506645203
    [ripemd160] => 0.18318411643982
    [haval128,3] => 0.18408892243958
    [sha384] => 0.18502903718567
    [haval128,4] => 0.18848111178589
    [haval256,4] => 0.18875202952576
    [haval160,4] => 0.1895639828186
    [haval224,4] => 0.19041207319641
    [haval192,4] => 0.19101205462646
    [whirlpool] => 0.19728892146301
    [haval256,5] => 0.19996902294922
    [haval160,5] => 0.20026498704529
    [haval192,5] => 0.20072503967285
    [haval128,5] => 0.20132308227539
    [haval224,5] => 0.2025869493103
    [gost] => 0.24892493852234
    [snefru256] => 0.28652299385071
    [snefru] => 0.29043891609192
    [md2] => 0.6300178873291
)