php中各种hash算法的执行速度比较

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PHP中的Hash函数很多，像MD4、MD5、SHA-1、SHA-256、SHA-384、SHA-512等我们比较常见，那么各个哈希的执行速度呢？

 $algos = hash_algos();
 foreach ($algos as $algo){
     $start = microtime(true);
     for($i=0; $i<50000; $i++){
         hash($algo, microtime().$i);
     }
     $end = microtime(true);
     $timeres[$algo] = $end-$start;
 }
 asort($timeres, SORT_NUMERIC);
 print_r($timeres);

对每个hash函数执行5000次，比较时间的长短。

运行结果如下：

     [fnv1a32] => 0.31601810455322
     [crc32] => 0.31901788711548
     [joaat] => 0.31901788711548
     [fnv132] => 0.32001781463623
     [adler32] => 0.32201790809631
     [fnv164] => 0.32901906967163
     [fnv1a64] => 0.33101892471313
     [crc32b] => 0.33302021026611
     [md4] => 0.34102010726929
     [sha256] => 0.37002110481262
     [ripemd160] => 0.37002110481262
     [haval160,3] => 0.37302088737488
     [haval192,3] => 0.37402105331421
     [haval128,3] => 0.37902212142944
     [sha1] => 0.3800220489502
     [tiger160,3] => 0.38202214241028
     [md5] => 0.38302183151245
     [haval224,3] => 0.38402199745178
     [ripemd128] => 0.38702178001404
     [sha224] => 0.38702201843262
     [haval256,3] => 0.38802194595337
     [haval192,4] => 0.39402318000793
     [ripemd320] => 0.39602184295654
     [tiger192,3] => 0.39702296257019
     [haval256,4] => 0.39802312850952
     [ripemd256] => 0.39902305603027
     [haval160,4] => 0.40202283859253
     [haval224,4] => 0.40202283859253
     [haval192,5] => 0.41402387619019
     [haval224,5] => 0.41502404212952
     [tiger160,4] => 0.41502404212952
     [haval160,5] => 0.41502404212952
     [haval128,5] => 0.4170229434967
     [tiger192,4] => 0.42202401161194
     [tiger128,4] => 0.42502403259277
     [haval256,5] => 0.44202518463135
     [tiger128,3] => 0.44602489471436
     [haval128,4] => 0.45202612876892
     [sha512] => 0.45602607727051
     [sha384] => 0.46702694892883
     [whirlpool] => 0.51503014564514
     [gost-crypto] => 0.51803016662598
     [gost] => 0.52102994918823
     [snefru256] => 0.60203409194946
     [snefru] => 0.60903477668762
     [md2] => 0.61003494262695

如上，CRC是冗余验证算法，不适合用来做唯一标识符Hash计算

执行速度上，md4 > sha256 > sha1 > md5

将标识转化为长字符串可以用md4()

密码上来说，sha256比sha1快速好用且安全