php md5下16位和32位的實(shí)現(xiàn)代碼
Jun 13, 2016 pm 12:29 PM
復(fù)制代碼 代碼如下:
echo?substr(md5("admin"),8,16);??//?16位MD5加密??
echo?"
";??
echo?md5("admin");????//?32位MD5加密??
?>??
??
16位的MD5加密用substr函數(shù)截取了字符得到實(shí)現(xiàn)....?
不想深入研究了?:)??要把腦力放到其他關(guān)鍵的地方~~?
今天做了個(gè)php鏈接mssql數(shù)據(jù)庫(kù),數(shù)據(jù)庫(kù)中的表中字段使用MD5十六加密的。但是php中的MD5默認(rèn)是32位,導(dǎo)致登錄程序沒(méi)辦法使用md5加密跟表中字段匹配,在網(wǎng)上一搜也有不少人有這方面的困惑,后來(lái)找到一個(gè)解決辦法,是正確的,就記錄下來(lái)。
使用substr函數(shù)截取:
substr(md5("admin"),8,16); // 16位MD5加密
md5("admin"); // 32位MD5加密
經(jīng)過(guò)腳本之家測(cè)試結(jié)果如下:
我們以asp的幾個(gè)md5后的結(jié)果比較
附:如果遇到MD5加密文件,而又不知道的密碼的,請(qǐng)?jiān)跀?shù)據(jù)庫(kù)中換上這組加密的數(shù)據(jù)。
admin---16位加密---7a57a5a743894a0e
admin---32位加密---21232f297a57a5a743894a0e4a801fc3
admin---40位加密---7a57a5a743894a0e4a801fc343894a0e4a801fc3
substr(md5("admin"),8,16); // 16位MD5加密 正是上面的32為從第8個(gè)字符開(kāi)始的16個(gè)字符。所以大家不用考慮唯一性的問(wèn)題。本身就是正確的。網(wǎng)上有人說(shuō)php5支持
復(fù)制代碼 代碼如下:
echo md5("admin",true);//返回16位,不過(guò)這是在PHP5里才有。
經(jīng)測(cè)試輸出的結(jié)果是亂碼,如果大家有什么好的代碼,可以分享下。

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