二次加密,数据校验
用于二次加密,数据校验,也许md5已经足够了,不过在用户密码字段里,还是会经常看到这样的md5串: e10adc3949ba59abbe56e057f20f883e,经常开测试账号的人你懂的
<?php $txt = "123456";// 原文 echo "txt={$txt}\r\n"; $key = "keyword";// 密钥,最好用ord后127以内的字符,且不要有字符重复 $encrpt = md5($txt);// md5后的密文 echo "md5={$encrpt}\r\n"; $j = 0; $lk = strlen($key); $lt = strlen($encrpt); for($i = 0;$i < $lt;$i++){ $j %= $lk; $sum = ord($encrpt[$i]) + ord($key[$j]);// 逐位拼接密钥 $encrpt[$i] = dechex($sum % 16);// 对16求余后生成新的16进制数,并替换对应位置字符 $j++; } echo "encrpt={$encrpt}"; ?>
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